diff --git a/lib/std/array_list.zig b/lib/std/array_list.zig
index e064b38566087886b330fcdf4c40ffa0ca8eee24..a7432a30aefe320bcfea5fd203d0b52e4316c2dd 100644
--- a/lib/std/array_list.zig
+++ b/lib/std/array_list.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/array_list_sentineled.zig b/lib/std/array_list_sentineled.zig
index 828be7462f73c718b98afec82360822ef4842dae..d73367327efba99278ae6df57c1ebca775f29b3a 100644
--- a/lib/std/array_list_sentineled.zig
+++ b/lib/std/array_list_sentineled.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const mem = std.mem;
diff --git a/lib/std/ascii.zig b/lib/std/ascii.zig
index 20bd9e47ebe42d6d846a1a14e08c3dc9a8da8e97..25c34ef0cc0a7b8c57e312ca844232bc45255432 100644
--- a/lib/std/ascii.zig
+++ b/lib/std/ascii.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Does NOT look at the locale the way C89's toupper(3), isspace() et cetera does.
 // I could have taken only a u7 to make this clear, but it would be slower
 // It is my opinion that encodings other than UTF-8 should not be supported.
diff --git a/lib/std/atomic.zig b/lib/std/atomic.zig
index 6f7b4fe75d1defdf2ee8d7ecc60cce89398c31d6..c465708ffa75c37b935bbd956e6066161ca713d8 100644
--- a/lib/std/atomic.zig
+++ b/lib/std/atomic.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const Stack = @import("atomic/stack.zig").Stack;
 pub const Queue = @import("atomic/queue.zig").Queue;
 pub const Int = @import("atomic/int.zig").Int;
diff --git a/lib/std/atomic/int.zig b/lib/std/atomic/int.zig
index 446059e7ef66723b4d765b7fa213ca752189d756..ae8c8da77803a8e979d75507d980740aeea183a6 100644
--- a/lib/std/atomic/int.zig
+++ b/lib/std/atomic/int.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Thread-safe, lock-free integer
 pub fn Int(comptime T: type) type {
     return struct {
diff --git a/lib/std/atomic/queue.zig b/lib/std/atomic/queue.zig
index 4df7522f291219f04fb46712237d111e02ed4a27..dd139106b40360cb9c5ff560a6bf117d3cb3630a 100644
--- a/lib/std/atomic/queue.zig
+++ b/lib/std/atomic/queue.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/atomic/stack.zig b/lib/std/atomic/stack.zig
index db749ecaaca6fe0ba2cada9b88ade24fd3b9cf74..1e289bae70b395556a30b68843062535bfd4ea57 100644
--- a/lib/std/atomic/stack.zig
+++ b/lib/std/atomic/stack.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const assert = std.debug.assert;
 const builtin = @import("builtin");
 const expect = std.testing.expect;
diff --git a/lib/std/base64.zig b/lib/std/base64.zig
index 39ad811eb68496ae67447183e6d58af642e18570..0b91a1cf0adccefc7e5edb247e976f1b13d56bd1 100644
--- a/lib/std/base64.zig
+++ b/lib/std/base64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/bloom_filter.zig b/lib/std/bloom_filter.zig
index 80e168b8fda42aacf8a0b48f4fee04c438f6f476..34fa42fe00064873349a7ad8c31df5c52c06bcab 100644
--- a/lib/std/bloom_filter.zig
+++ b/lib/std/bloom_filter.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std.zig");
 const math = std.math;
diff --git a/lib/std/buf_map.zig b/lib/std/buf_map.zig
index 5cf4a54ed35138fe4680eba14de0fa72bb02f073..0fb2156c43ee658c89f80f6924f5b67d79f81eb7 100644
--- a/lib/std/buf_map.zig
+++ b/lib/std/buf_map.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const StringHashMap = std.StringHashMap;
 const mem = std.mem;
diff --git a/lib/std/buf_set.zig b/lib/std/buf_set.zig
index d8a0264bd71fac60a8f9bf93c1189b29d7cf33c8..1f5dda09c27904eed048a569f8bf252b565a7040 100644
--- a/lib/std/buf_set.zig
+++ b/lib/std/buf_set.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const StringHashMap = std.StringHashMap;
 const mem = @import("mem.zig");
diff --git a/lib/std/build.zig b/lib/std/build.zig
index be39e8010c7e06f088932b981be5c44f99bcb4c1..1673737bef42afbc579f75187b9b30d8e5196a3b 100644
--- a/lib/std/build.zig
+++ b/lib/std/build.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/build/check_file.zig b/lib/std/build/check_file.zig
index 2d8e58f92caecba7b03c91c31f70132dacea34a3..e1372c0fe9a99622e7e60f7c0fcdc995c8856424 100644
--- a/lib/std/build/check_file.zig
+++ b/lib/std/build/check_file.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = std.build;
 const Step = build.Step;
diff --git a/lib/std/build/emit_raw.zig b/lib/std/build/emit_raw.zig
index 688a50e8fa8eefd13bb98972cb38f30fee7847d8..d499df1817f9d71c93bf5a10554a9d78688d4042 100644
--- a/lib/std/build/emit_raw.zig
+++ b/lib/std/build/emit_raw.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 const Allocator = std.mem.Allocator;
diff --git a/lib/std/build/fmt.zig b/lib/std/build/fmt.zig
index 8fb12df8243eb84bd2e2c7106676ff9fd04b06b9..8f0176c00eacd62234d3b626d10a3b95b5529cfc 100644
--- a/lib/std/build/fmt.zig
+++ b/lib/std/build/fmt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = @import("../build.zig");
 const Step = build.Step;
diff --git a/lib/std/build/run.zig b/lib/std/build/run.zig
index 839e177edd8d96f27ede0364d32c75a72ef68f77..71e0d614f518e3479488d24e79520e2b1a4a75d3 100644
--- a/lib/std/build/run.zig
+++ b/lib/std/build/run.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const build = std.build;
diff --git a/lib/std/build/translate_c.zig b/lib/std/build/translate_c.zig
index 1bc36ba8c46bad079daa8cf08c88423d8868610f..8ca2b872093f08bd55fdf02cf5d178beb37c8a32 100644
--- a/lib/std/build/translate_c.zig
+++ b/lib/std/build/translate_c.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = std.build;
 const Step = build.Step;
diff --git a/lib/std/build/write_file.zig b/lib/std/build/write_file.zig
index ad0e13bed224d05721fe91a9a209cdd3056bcf62..fe15e6e0e30b5d985b0723c9e66b4081e42d73a1 100644
--- a/lib/std/build/write_file.zig
+++ b/lib/std/build/write_file.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const build = @import("../build.zig");
 const Step = build.Step;
diff --git a/lib/std/builtin.zig b/lib/std/builtin.zig
index 49edab1fd738a3b979fe18a1e918ef78f0ad67c8..7f3fcfc96cf90d196885689c23053f2d9701fee6 100644
--- a/lib/std/builtin.zig
+++ b/lib/std/builtin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub usingnamespace @import("builtin");
 
 /// Deprecated: use `std.Target`.
diff --git a/lib/std/c.zig b/lib/std/c.zig
index e836a49c30050e5d3b308078e8660c2832567e8a..b4e5fc739201815aa0ed0a7d0545bf3819271e9b 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const page_size = std.mem.page_size;
diff --git a/lib/std/c/ast.zig b/lib/std/c/ast.zig
index 467050d57d08ac953d9bad026aaeb5fb781280e2..550ba52b844ae5e90fb8938221a11271a4785ee8 100644
--- a/lib/std/c/ast.zig
+++ b/lib/std/c/ast.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const SegmentedList = std.SegmentedList;
 const Token = std.c.Token;
diff --git a/lib/std/c/darwin.zig b/lib/std/c/darwin.zig
index 242663856965d4d7a65613497686316fc6684e7a..411aeb80561c3cdedd3abd975dbd6832de5542d3 100644
--- a/lib/std/c/darwin.zig
+++ b/lib/std/c/darwin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const builtin = @import("builtin");
diff --git a/lib/std/c/dragonfly.zig b/lib/std/c/dragonfly.zig
index 0c859018bef0f08de6c4b8d4b5db61fb031b65d0..2550cacc5bdefed798486de62c519957dbb74877 100644
--- a/lib/std/c/dragonfly.zig
+++ b/lib/std/c/dragonfly.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 usingnamespace std.c;
 extern "c" threadlocal var errno: c_int;
diff --git a/lib/std/c/emscripten.zig b/lib/std/c/emscripten.zig
index e91e1421c7e3cb83d00c3ae7deb54f3eee42c919..e94a6f1004c4d1f46b8faa1e19293fd7576c65fe 100644
--- a/lib/std/c/emscripten.zig
+++ b/lib/std/c/emscripten.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     size: [__SIZEOF_PTHREAD_MUTEX_T]u8 align(4) = [_]u8{0} ** __SIZEOF_PTHREAD_MUTEX_T,
 };
diff --git a/lib/std/c/freebsd.zig b/lib/std/c/freebsd.zig
index ea52c05f0bcfee852f4a9d5b8e3a907eeb495035..1545a0e153de4ee80cbdd4382a4fe2ef80452ad1 100644
--- a/lib/std/c/freebsd.zig
+++ b/lib/std/c/freebsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 usingnamespace std.c;
 
diff --git a/lib/std/c/fuchsia.zig b/lib/std/c/fuchsia.zig
index 4f52b8900d576bc10669c818e255b4ad80698b13..ceeb34a7636740555c898001556e3698ec7ea6e1 100644
--- a/lib/std/c/fuchsia.zig
+++ b/lib/std/c/fuchsia.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     size: [__SIZEOF_PTHREAD_MUTEX_T]u8 align(@alignOf(usize)) = [_]u8{0} ** __SIZEOF_PTHREAD_MUTEX_T,
 };
diff --git a/lib/std/c/haiku.zig b/lib/std/c/haiku.zig
index eb1e52a6184d313ac42cf6bfcd691add475e8667..6b56e163c86bc805ee548311d3bd3f07dff8c1bb 100644
--- a/lib/std/c/haiku.zig
+++ b/lib/std/c/haiku.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     flags: u32 = 0,
     lock: i32 = 0,
diff --git a/lib/std/c/hermit.zig b/lib/std/c/hermit.zig
index 1730aa43ac18874491038d1d732b6d5d6d892ef5..6762e609621465a11cce6d5bed798f7fb5e42b0a 100644
--- a/lib/std/c/hermit.zig
+++ b/lib/std/c/hermit.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     inner: usize = ~@as(usize, 0),
 };
diff --git a/lib/std/c/linux.zig b/lib/std/c/linux.zig
index b9f29b211dd1998f12c118447c60b501f4815d72..538fbdfd7df5f033617041979c872caa7e8d6563 100644
--- a/lib/std/c/linux.zig
+++ b/lib/std/c/linux.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("../std.zig");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/c/minix.zig b/lib/std/c/minix.zig
index 98ec087a933f5d1250ee9da0270df90c9c157ea3..2bc1bac47a062d62d91e267393abffb8cfd1bf39 100644
--- a/lib/std/c/minix.zig
+++ b/lib/std/c/minix.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 pub const pthread_mutex_t = extern struct {
     size: [__SIZEOF_PTHREAD_MUTEX_T]u8 align(@alignOf(usize)) = [_]u8{0} ** __SIZEOF_PTHREAD_MUTEX_T,
diff --git a/lib/std/c/netbsd.zig b/lib/std/c/netbsd.zig
index 31adbb1f59dcbafaf87d45a15024d2b5324f6a6a..0eb8e32bae9579dc958c89812267c4c987ede57d 100644
--- a/lib/std/c/netbsd.zig
+++ b/lib/std/c/netbsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 
diff --git a/lib/std/c/openbsd.zig b/lib/std/c/openbsd.zig
index 22963b08c33e5c09275f605c80f5cb7db660ab42..8a6439fc8341a3a1a2af56706ca7dbc710a49fff 100644
--- a/lib/std/c/openbsd.zig
+++ b/lib/std/c/openbsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     inner: ?*c_void = null,
 };
diff --git a/lib/std/c/parse.zig b/lib/std/c/parse.zig
index 4c6c2fb46218b0c2c1da41c7821d190744146e27..d5b1a4a01e88ba63f416a7b2584eebfa7834fcb1 100644
--- a/lib/std/c/parse.zig
+++ b/lib/std/c/parse.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 const assert = std.debug.assert;
diff --git a/lib/std/c/solaris.zig b/lib/std/c/solaris.zig
index 7c70a01fc4ac1c9281c6ad6476c61d959ddb2889..49ce0886f7d44e34c7a25796d18a05c61d3542d9 100644
--- a/lib/std/c/solaris.zig
+++ b/lib/std/c/solaris.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const pthread_mutex_t = extern struct {
     __pthread_mutex_flag1: u16 = 0,
     __pthread_mutex_flag2: u8 = 0,
diff --git a/lib/std/c/tokenizer.zig b/lib/std/c/tokenizer.zig
index a3e6710e2fe3ced56c1777c3ab60163548549222..9e9b5f414776025a6695e84396556c6dd7ca08c3 100644
--- a/lib/std/c/tokenizer.zig
+++ b/lib/std/c/tokenizer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 
diff --git a/lib/std/c/windows.zig b/lib/std/c/windows.zig
index 35ca2171318353bb4d78ce9fa812650aef778d7c..cd3932419215716bf37e86489c0ea24751ce3a91 100644
--- a/lib/std/c/windows.zig
+++ b/lib/std/c/windows.zig
@@ -1 +1,6 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub extern "c" fn _errno() *c_int;
diff --git a/lib/std/cache_hash.zig b/lib/std/cache_hash.zig
index 79597a266386fd19b0f0d6129bd724d516533283..58c9f444f31ae252603f3e30b70b596d3af8bf02 100644
--- a/lib/std/cache_hash.zig
+++ b/lib/std/cache_hash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const Blake3 = std.crypto.Blake3;
 const fs = std.fs;
diff --git a/lib/std/child_process.zig b/lib/std/child_process.zig
index 5754cc2d532b8729f368a0b40794f0848503d495..3254b958b7d09257b01ac4615edcff356c7e289d 100644
--- a/lib/std/child_process.zig
+++ b/lib/std/child_process.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const cstr = std.cstr;
 const unicode = std.unicode;
diff --git a/lib/std/coff.zig b/lib/std/coff.zig
index 1ab88f6baffdfa2c64cdff189f3f61efd92fbf3d..cd567b3a6ecd3ac7532ad7c45197c539b2294473 100644
--- a/lib/std/coff.zig
+++ b/lib/std/coff.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std.zig");
 const io = std.io;
diff --git a/lib/std/comptime_string_map.zig b/lib/std/comptime_string_map.zig
index 8cc5cac130a0e86957f86f276be6bddc38d73424..ed647124a8fc477881f9b0866c3075db75462e2d 100644
--- a/lib/std/comptime_string_map.zig
+++ b/lib/std/comptime_string_map.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const mem = std.mem;
 
diff --git a/lib/std/crypto.zig b/lib/std/crypto.zig
index c1909a18239a636b9a32aacc5fad8ee92c6586a3..edca2bc2ff4775368aa75c8ba8d5b914865bca11 100644
--- a/lib/std/crypto.zig
+++ b/lib/std/crypto.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const Md5 = @import("crypto/md5.zig").Md5;
 pub const Sha1 = @import("crypto/sha1.zig").Sha1;
 
diff --git a/lib/std/crypto/25519/curve25519.zig b/lib/std/crypto/25519/curve25519.zig
index 46d7b9a3a6892a19a6865ac9970454279197b335..94490f674c1db550e26471191dcde5461710a1ad 100644
--- a/lib/std/crypto/25519/curve25519.zig
+++ b/lib/std/crypto/25519/curve25519.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 /// Group operations over Curve25519.
diff --git a/lib/std/crypto/25519/ed25519.zig b/lib/std/crypto/25519/ed25519.zig
index eb004d2607394313aa15fb367e1c40f77f8f90b5..935abaecb39def38927e317f2b9a7b32537b1208 100644
--- a/lib/std/crypto/25519/ed25519.zig
+++ b/lib/std/crypto/25519/ed25519.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const fmt = std.fmt;
 const mem = std.mem;
diff --git a/lib/std/crypto/25519/edwards25519.zig b/lib/std/crypto/25519/edwards25519.zig
index 11f59631016cd494fe001e1642904ec266dbd412..176e5337da0b4bc0cd91ed1762ea8a7cd1d5133e 100644
--- a/lib/std/crypto/25519/edwards25519.zig
+++ b/lib/std/crypto/25519/edwards25519.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const fmt = std.fmt;
 
diff --git a/lib/std/crypto/25519/field.zig b/lib/std/crypto/25519/field.zig
index 85b8c683156ef087a105fb0582475fea2bba218d..61929ba04422f21add5c253c8d765d408cc01903 100644
--- a/lib/std/crypto/25519/field.zig
+++ b/lib/std/crypto/25519/field.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const readIntLittle = std.mem.readIntLittle;
 const writeIntLittle = std.mem.writeIntLittle;
diff --git a/lib/std/crypto/25519/ristretto255.zig b/lib/std/crypto/25519/ristretto255.zig
index a9636074a63ba480213ccda35b17eb1681827a2f..4e6494ed3861d24915f742502b5e77db65bfa971 100644
--- a/lib/std/crypto/25519/ristretto255.zig
+++ b/lib/std/crypto/25519/ristretto255.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const fmt = std.fmt;
 
diff --git a/lib/std/crypto/25519/scalar.zig b/lib/std/crypto/25519/scalar.zig
index 3a3a29d4bc2836eca42fc521d1477163b90e3db7..2658126eeb9f79dfb773969ddbe5b8c2ee32ecfe 100644
--- a/lib/std/crypto/25519/scalar.zig
+++ b/lib/std/crypto/25519/scalar.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 
diff --git a/lib/std/crypto/25519/x25519.zig b/lib/std/crypto/25519/x25519.zig
index 4b5a8b8482662eba6690584c77cca5493e1305cd..913140657d81c3653a1b73527f4a0fb814868e91 100644
--- a/lib/std/crypto/25519/x25519.zig
+++ b/lib/std/crypto/25519/x25519.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 const fmt = std.fmt;
diff --git a/lib/std/crypto/aes.zig b/lib/std/crypto/aes.zig
index 25070b3a44901e04c44115bac18e4379876a6d9a..2174fbdd4ffd372ad7d00bd385650970f637b46a 100644
--- a/lib/std/crypto/aes.zig
+++ b/lib/std/crypto/aes.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Based on Go stdlib implementation
 
 const std = @import("../std.zig");
diff --git a/lib/std/crypto/benchmark.zig b/lib/std/crypto/benchmark.zig
index 267c2881b4209da2148bddb95c2b2a24159d7731..5c27f2f4f5374f75e6ad5c603c7911fb741def1e 100644
--- a/lib/std/crypto/benchmark.zig
+++ b/lib/std/crypto/benchmark.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // zig run benchmark.zig --release-fast --override-lib-dir ..
 
 const builtin = @import("builtin");
diff --git a/lib/std/crypto/blake2.zig b/lib/std/crypto/blake2.zig
index ab44ca5298633205ead0cd54f3da3c1cea383d90..9f5194994deb73ba9b927db0b7d746185f6589bc 100644
--- a/lib/std/crypto/blake2.zig
+++ b/lib/std/crypto/blake2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const mem = @import("../mem.zig");
 const builtin = @import("builtin");
 const debug = @import("../debug.zig");
diff --git a/lib/std/crypto/blake3.zig b/lib/std/crypto/blake3.zig
index 08479d65a54b9bac044e1aff84265fa4ab9be011..08986965fc4a58b9d62adefbe23419bcff13ee9a 100644
--- a/lib/std/crypto/blake3.zig
+++ b/lib/std/crypto/blake3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Translated from BLAKE3 reference implementation.
 // Source: https://github.com/BLAKE3-team/BLAKE3
 
diff --git a/lib/std/crypto/chacha20.zig b/lib/std/crypto/chacha20.zig
index e51123eb81ff326b77d608d7ae17fa15f43952dc..d402eb67505c855da37c00f8ff1b96d91c55fd03 100644
--- a/lib/std/crypto/chacha20.zig
+++ b/lib/std/crypto/chacha20.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Based on public domain Supercop by Daniel J. Bernstein
 
 const std = @import("../std.zig");
diff --git a/lib/std/crypto/gimli.zig b/lib/std/crypto/gimli.zig
index 6861c72a6337e4c06a553f18b52b4503c541be27..33afae5f82c5a311da4f677b18191f214ce0fc8c 100644
--- a/lib/std/crypto/gimli.zig
+++ b/lib/std/crypto/gimli.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Gimli is a 384-bit permutation designed to achieve high security with high
 // performance across a broad range of platforms, including 64-bit Intel/AMD
 // server CPUs, 64-bit and 32-bit ARM smartphone CPUs, 32-bit ARM
diff --git a/lib/std/crypto/hmac.zig b/lib/std/crypto/hmac.zig
index 69c1b86386cb362fd5c58b0e5eb32b2814d1dcad..984dacc96783e799595e14fb5abc6d6a0e4f1eac 100644
--- a/lib/std/crypto/hmac.zig
+++ b/lib/std/crypto/hmac.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const crypto = std.crypto;
 const debug = std.debug;
diff --git a/lib/std/crypto/md5.zig b/lib/std/crypto/md5.zig
index ac8948ca20a5fe7ca81572d2c90ddd8b23b0d201..d578ba8b957b6e0dc47358ecc81cdf5251c7e30d 100644
--- a/lib/std/crypto/md5.zig
+++ b/lib/std/crypto/md5.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const mem = @import("../mem.zig");
 const math = @import("../math.zig");
 const endian = @import("../endian.zig");
diff --git a/lib/std/crypto/poly1305.zig b/lib/std/crypto/poly1305.zig
index fda978307d280c7cdb4fa4ba76a7267501b2b673..2ed97f4c2e2b96cdb20cdec97e06bdc753290a47 100644
--- a/lib/std/crypto/poly1305.zig
+++ b/lib/std/crypto/poly1305.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Translated from monocypher which is licensed under CC-0/BSD-3.
 //
 // https://monocypher.org/
diff --git a/lib/std/crypto/sha1.zig b/lib/std/crypto/sha1.zig
index 6edf7b745e1d9b312e9918b5c8c8dcbab915357d..7cb4fbcf36becff4ae793f2223abd884053c216b 100644
--- a/lib/std/crypto/sha1.zig
+++ b/lib/std/crypto/sha1.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const mem = @import("../mem.zig");
 const math = @import("../math.zig");
 const endian = @import("../endian.zig");
diff --git a/lib/std/crypto/sha2.zig b/lib/std/crypto/sha2.zig
index f004bceac3bd4f5733c51ae97dec29f4b2023ff7..cac18ca1f7b0f6e2faa90cdc19a3c927ba7002db 100644
--- a/lib/std/crypto/sha2.zig
+++ b/lib/std/crypto/sha2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const mem = @import("../mem.zig");
 const math = @import("../math.zig");
 const endian = @import("../endian.zig");
diff --git a/lib/std/crypto/sha3.zig b/lib/std/crypto/sha3.zig
index 7c60674d7594b8364f5a2e755bc9dcab31103596..03635ca55378345371d049f4bbad4f8a23007e5b 100644
--- a/lib/std/crypto/sha3.zig
+++ b/lib/std/crypto/sha3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const mem = @import("../mem.zig");
 const math = @import("../math.zig");
 const endian = @import("../endian.zig");
diff --git a/lib/std/crypto/test.zig b/lib/std/crypto/test.zig
index 61260c7e39a55faadc44f5c55a3e060969434454..e4e34e543b95f2732df65c61afdbaa3b91757898 100644
--- a/lib/std/crypto/test.zig
+++ b/lib/std/crypto/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const mem = std.mem;
diff --git a/lib/std/cstr.zig b/lib/std/cstr.zig
index 9cb16b0ed31746495b1d4da7a65bfc2962d321a2..4e11ad920183946ab4975762e2a1bdee739952ac 100644
--- a/lib/std/cstr.zig
+++ b/lib/std/cstr.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const debug = std.debug;
diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index fb1c3a3a88680eae28ebe98a8f1986161ca79608..be57c0b2fd67fbf2e124ed17fafaeb0013284147 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const math = std.math;
diff --git a/lib/std/debug/leb128.zig b/lib/std/debug/leb128.zig
index 7f43fdf49414b9ed30bd3d598a13c28ef3d0b19c..eca777c1cf425e8a42f7d549c4cd084843acf6b4 100644
--- a/lib/std/debug/leb128.zig
+++ b/lib/std/debug/leb128.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const testing = std.testing;
 
diff --git a/lib/std/dwarf.zig b/lib/std/dwarf.zig
index 085e394a8fd9f7bf758a75d53110f411d436d415..37b76b1c14bf575d7be1623aeeb2fd5612d0946d 100644
--- a/lib/std/dwarf.zig
+++ b/lib/std/dwarf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const debug = std.debug;
diff --git a/lib/std/dwarf_bits.zig b/lib/std/dwarf_bits.zig
index a40fa8a2777312dd2447b2620124f0abdea1f48c..bf9c97154cbcda2deffa8d4630c741de913c1de5 100644
--- a/lib/std/dwarf_bits.zig
+++ b/lib/std/dwarf_bits.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const TAG_padding = 0x00;
 pub const TAG_array_type = 0x01;
 pub const TAG_class_type = 0x02;
diff --git a/lib/std/dynamic_library.zig b/lib/std/dynamic_library.zig
index 65c65292bc08f788323f51e17049d667f85368f6..238854f07f88e92f51c0996bbb36bc3bc6784e51 100644
--- a/lib/std/dynamic_library.zig
+++ b/lib/std/dynamic_library.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 const std = @import("std.zig");
diff --git a/lib/std/elf.zig b/lib/std/elf.zig
index a241ef9537fd906b8aac9b46ca7351c9777d8f20..79303e71635f67d020ed30b22598f2ba3a653aa5 100644
--- a/lib/std/elf.zig
+++ b/lib/std/elf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/event.zig b/lib/std/event.zig
index d042e2ad9b3247102bb7c9a2ba62e16646df4463..42f3176a1b2f307e2376a869ac64ac31971a50ba 100644
--- a/lib/std/event.zig
+++ b/lib/std/event.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const Channel = @import("event/channel.zig").Channel;
 pub const Future = @import("event/future.zig").Future;
 pub const Group = @import("event/group.zig").Group;
diff --git a/lib/std/event/batch.zig b/lib/std/event/batch.zig
index 8f2954d85bc205af7696341117cc76f0e4c7bf57..2ace2f791437669c760d78cea52e7af4527e200e 100644
--- a/lib/std/event/batch.zig
+++ b/lib/std/event/batch.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 
diff --git a/lib/std/event/channel.zig b/lib/std/event/channel.zig
index 5aef0bb3ba8b78587702d6683ca14c8dfd48cc6e..de5b2c67ab09e78c2576a039ca9cdcfe500fb030 100644
--- a/lib/std/event/channel.zig
+++ b/lib/std/event/channel.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/event/future.zig b/lib/std/event/future.zig
index 5de22c574c409191b89e0cf409f9beca0d647676..c9777288e4bc25c7d22c1031ef1e65f7bce8e071 100644
--- a/lib/std/event/future.zig
+++ b/lib/std/event/future.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/event/group.zig b/lib/std/event/group.zig
index 0dc6550218267e99724ef08bdb052ccea7b7c357..e91adbbe8c3b41e41028b78f77acb7ed867c8f0f 100644
--- a/lib/std/event/group.zig
+++ b/lib/std/event/group.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const Lock = std.event.Lock;
diff --git a/lib/std/event/lock.zig b/lib/std/event/lock.zig
index 179b881c9cf306fbd50140e710ccaab7fff1f89d..d27a12aef88de6b71a92566912db39e6db3f576f 100644
--- a/lib/std/event/lock.zig
+++ b/lib/std/event/lock.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/event/locked.zig b/lib/std/event/locked.zig
index e921803447c4740bea1a921b7950d29d00dac928..9a53116fd66974ef2d4e302be11a13d528a7ba91 100644
--- a/lib/std/event/locked.zig
+++ b/lib/std/event/locked.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const Lock = std.event.Lock;
 
diff --git a/lib/std/event/loop.zig b/lib/std/event/loop.zig
index 0abcad32e1d94ba1f88fcf46bb05facf06951674..b34ad8c940bd9c82f17565053f06638953e73753 100644
--- a/lib/std/event/loop.zig
+++ b/lib/std/event/loop.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const root = @import("root");
diff --git a/lib/std/event/rwlock.zig b/lib/std/event/rwlock.zig
index 7a47c27dd81e96c36fbbb184fc70823d1964a2ec..3e3928d379f9bda819752bbceb1ce8688e7137e4 100644
--- a/lib/std/event/rwlock.zig
+++ b/lib/std/event/rwlock.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/event/rwlocked.zig b/lib/std/event/rwlocked.zig
index 9a569e8f1f97b44430fa976c1ae9fd752339fddb..4fb25b59a11a11cff3932f34bb83f16079d26253 100644
--- a/lib/std/event/rwlocked.zig
+++ b/lib/std/event/rwlocked.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const RwLock = std.event.RwLock;
 
diff --git a/lib/std/fifo.zig b/lib/std/fifo.zig
index 1edb413f47abdf3663675628f912fb91ef03905b..c92da615f91a98ad743737ba3f51a5faa6165499 100644
--- a/lib/std/fifo.zig
+++ b/lib/std/fifo.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // FIFO of fixed size items
 // Usually used for e.g. byte buffers
 
diff --git a/lib/std/fmt.zig b/lib/std/fmt.zig
index 6dbef5db67fe902f317298223e419e0320fc52de..16d0eaa07a3f8054a4b086a5b116820f9d29ea42 100644
--- a/lib/std/fmt.zig
+++ b/lib/std/fmt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const math = std.math;
 const assert = std.debug.assert;
diff --git a/lib/std/fmt/errol.zig b/lib/std/fmt/errol.zig
index e697b7d42fa2f62bc7a3be13de6948290af6b62b..6a0a2256d84a21d3391953afb7c14a6818f189a1 100644
--- a/lib/std/fmt/errol.zig
+++ b/lib/std/fmt/errol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const enum3 = @import("errol/enum3.zig").enum3;
 const enum3_data = @import("errol/enum3.zig").enum3_data;
diff --git a/lib/std/fmt/errol/enum3.zig b/lib/std/fmt/errol/enum3.zig
index c27753483d168ce07c0f79b64f6e310e9d76b3fd..9dbe27c07250d5f799eb76289c75bfc95ac4b262 100644
--- a/lib/std/fmt/errol/enum3.zig
+++ b/lib/std/fmt/errol/enum3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const enum3 = [_]u64{
     0x4e2e2785c3a2a20b,
     0x240a28877a09a4e1,
diff --git a/lib/std/fmt/errol/lookup.zig b/lib/std/fmt/errol/lookup.zig
index 2fb6b167bb49c1eccd28bd95700e2e075f4e0bae..85a4234bcad2e880d867c01cb3d7901057b5be22 100644
--- a/lib/std/fmt/errol/lookup.zig
+++ b/lib/std/fmt/errol/lookup.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const HP = struct {
     val: f64,
     off: f64,
diff --git a/lib/std/fmt/parse_float.zig b/lib/std/fmt/parse_float.zig
index 2ab245043c6907ebf467eea411c336c47aece489..69557714f6d482a0bc6d263dde9e171dd8b29c63 100644
--- a/lib/std/fmt/parse_float.zig
+++ b/lib/std/fmt/parse_float.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Adapted from https://github.com/grzegorz-kraszewski/stringtofloat.
 
 // MIT License
diff --git a/lib/std/fs.zig b/lib/std/fs.zig
index a492a43499e55f9fc90459ed8f3441523d6e7ce8..df368e070bfb5632d89b814b4a26d36e08fb4bbe 100644
--- a/lib/std/fs.zig
+++ b/lib/std/fs.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std.zig");
 const os = std.os;
diff --git a/lib/std/fs/file.zig b/lib/std/fs/file.zig
index ce71571c9fdcb10f44921daa85af95a56f663986..3e22528ea991b0021819f43e56ba700b73208ca9 100644
--- a/lib/std/fs/file.zig
+++ b/lib/std/fs/file.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const os = std.os;
diff --git a/lib/std/fs/get_app_data_dir.zig b/lib/std/fs/get_app_data_dir.zig
index c68232d0b5eaa3700396a57bc550514d5f3f8fe3..17d365f68439f8d9bd173855283b5a80c1b912af 100644
--- a/lib/std/fs/get_app_data_dir.zig
+++ b/lib/std/fs/get_app_data_dir.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const unicode = std.unicode;
diff --git a/lib/std/fs/path.zig b/lib/std/fs/path.zig
index 2176498feb938cf7f0f9008755bbb331097b1a30..5e418e8e5cc787bfde80e52b41e64cdaf236cec6 100644
--- a/lib/std/fs/path.zig
+++ b/lib/std/fs/path.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("../std.zig");
 const debug = std.debug;
diff --git a/lib/std/fs/test.zig b/lib/std/fs/test.zig
index 9e6f4bb3ac746a2940d076e6e11c9bcd06655243..4be64ef225c65a37f4eb16596f82fd22caf50590 100644
--- a/lib/std/fs/test.zig
+++ b/lib/std/fs/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const builtin = std.builtin;
diff --git a/lib/std/fs/wasi.zig b/lib/std/fs/wasi.zig
index 149ede252d5ca1a3732de458f03c2512691852ed..cad86e2314eb475d7ddc81ed3a090a7f27bd6539 100644
--- a/lib/std/fs/wasi.zig
+++ b/lib/std/fs/wasi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const os = std.os;
 const mem = std.mem;
diff --git a/lib/std/fs/watch.zig b/lib/std/fs/watch.zig
index 635818b70226005c8269cd668c3296ad9e01dd93..269cdec6d8ebc773de5e302a8de35e8177742a34 100644
--- a/lib/std/fs/watch.zig
+++ b/lib/std/fs/watch.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = @import("builtin");
 const event = std.event;
diff --git a/lib/std/hash.zig b/lib/std/hash.zig
index c51353b328fdec14e4d068896b0a08541d1d19e8..1cc078959cc9bdefea43a1fe5a3481b77b7c67ff 100644
--- a/lib/std/hash.zig
+++ b/lib/std/hash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const adler = @import("hash/adler.zig");
 pub const Adler32 = adler.Adler32;
 
diff --git a/lib/std/hash/adler.zig b/lib/std/hash/adler.zig
index 173a07596c0cb89c70f9fe5226af4a3b3aef25bf..a3fc915f7640f9940ace731ca41ce8e9bf656b12 100644
--- a/lib/std/hash/adler.zig
+++ b/lib/std/hash/adler.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Adler32 checksum.
 //
 // https://tools.ietf.org/html/rfc1950#section-9
diff --git a/lib/std/hash/auto_hash.zig b/lib/std/hash/auto_hash.zig
index 996d6ede388cbef99d8b7bf74d0057c87b8279db..2905a6af13a80eb3ccca23ca3052ff46da8b7389 100644
--- a/lib/std/hash/auto_hash.zig
+++ b/lib/std/hash/auto_hash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/hash/benchmark.zig b/lib/std/hash/benchmark.zig
index 5f8a15831c3fefd7cbf704d5da29155e8b971b82..c23743160b684deb9aa347bf3ac8aab18c9d13ea 100644
--- a/lib/std/hash/benchmark.zig
+++ b/lib/std/hash/benchmark.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // zig run benchmark.zig --release-fast --override-lib-dir ..
 
 const builtin = @import("builtin");
diff --git a/lib/std/hash/cityhash.zig b/lib/std/hash/cityhash.zig
index 73b94acbd2b14a36c62a8beeb4da61e0d8044c6d..38e62d88efee39eba0bf80a6a6585cff1c6bc26d 100644
--- a/lib/std/hash/cityhash.zig
+++ b/lib/std/hash/cityhash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 
diff --git a/lib/std/hash/crc.zig b/lib/std/hash/crc.zig
index 506d8c8aed13f4b273d7a18bcd44486d9cf1a179..37695df8b3de801b9d5e21d5f95e311eb4dd47eb 100644
--- a/lib/std/hash/crc.zig
+++ b/lib/std/hash/crc.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // There are two implementations of CRC32 implemented with the following key characteristics:
 //
 // - Crc32WithPoly uses 8Kb of tables but is ~10x faster than the small method.
diff --git a/lib/std/hash/fnv.zig b/lib/std/hash/fnv.zig
index 8094134e193e5d9588f67040ce569080eb50b185..81285be9a888e26e91a9371281d6d523d6239424 100644
--- a/lib/std/hash/fnv.zig
+++ b/lib/std/hash/fnv.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // FNV1a - Fowler-Noll-Vo hash function
 //
 // FNV1a is a fast, non-cryptographic hash function with fairly good distribution properties.
diff --git a/lib/std/hash/murmur.zig b/lib/std/hash/murmur.zig
index effa13ad690912f7e5993ba39af4516be9129f68..d4204509c19d4be490afae345273d86739987e26 100644
--- a/lib/std/hash/murmur.zig
+++ b/lib/std/hash/murmur.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const testing = std.testing;
diff --git a/lib/std/hash/siphash.zig b/lib/std/hash/siphash.zig
index ebafdd68554d9f5192e1b84adc3737306f27141f..107ea197280a13cd6eefbd21fd7d0af38d7bcbb2 100644
--- a/lib/std/hash/siphash.zig
+++ b/lib/std/hash/siphash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Siphash
 //
 // SipHash is a moderately fast, non-cryptographic keyed hash function designed for resistance
diff --git a/lib/std/hash/wyhash.zig b/lib/std/hash/wyhash.zig
index ed2f03350c237481102d254aba3296a776efae1e..12b400c38f6417cc47da7b4e4065d3d97422ec95 100644
--- a/lib/std/hash/wyhash.zig
+++ b/lib/std/hash/wyhash.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 
diff --git a/lib/std/hash_map.zig b/lib/std/hash_map.zig
index d52a337422b11348ad4c63410168cc1afb9bd061..8966737a0c78c17ce7d6daa080ad3249d2de5c8e 100644
--- a/lib/std/hash_map.zig
+++ b/lib/std/hash_map.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/heap.zig b/lib/std/heap.zig
index 4a2837d40868039c08ca258c634ebe57426df036..d6977f2f9c3a4c0abe775fe6479f409955492784 100644
--- a/lib/std/heap.zig
+++ b/lib/std/heap.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const root = @import("root");
 const debug = std.debug;
diff --git a/lib/std/heap/arena_allocator.zig b/lib/std/heap/arena_allocator.zig
index 191f0c19e92ef1452f688c20d4291d54610a856f..e4bce8087f88f7bb2b225d4738d943783c674f2c 100644
--- a/lib/std/heap/arena_allocator.zig
+++ b/lib/std/heap/arena_allocator.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const mem = std.mem;
diff --git a/lib/std/heap/general_purpose_allocator.zig b/lib/std/heap/general_purpose_allocator.zig
index cb53af113e1c977321107bd2e6b832c0d387cfe3..5d8de5845d22dc5d39aad2e24260f26ed72d4c97 100644
--- a/lib/std/heap/general_purpose_allocator.zig
+++ b/lib/std/heap/general_purpose_allocator.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 //! # General Purpose Allocator
 //!
 //! ## Design Priorities
diff --git a/lib/std/heap/logging_allocator.zig b/lib/std/heap/logging_allocator.zig
index eff20a5c462038b6f88b2422cc7011d8951968ab..0e3e460b89371eceb7592fce1f6644710dd18149 100644
--- a/lib/std/heap/logging_allocator.zig
+++ b/lib/std/heap/logging_allocator.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const Allocator = std.mem.Allocator;
 
diff --git a/lib/std/http.zig b/lib/std/http.zig
index acb005a75fcb447702a899b9ae1593a5aed45e70..2b8495db712f679fc4564fde71f9f8a269943f0f 100644
--- a/lib/std/http.zig
+++ b/lib/std/http.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 test "std.http" {
     _ = @import("http/headers.zig");
 }
diff --git a/lib/std/http/headers.zig b/lib/std/http/headers.zig
index 86aff5f36443804af3c2303ecebf19ad86a5355c..8c80af512f3fdc6acc233698cd0058ec41a9a1db 100644
--- a/lib/std/http/headers.zig
+++ b/lib/std/http/headers.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // HTTP Header data structure/type
 // Based on lua-http's http.header module
 //
diff --git a/lib/std/io.zig b/lib/std/io.zig
index 6d613b514a2c3125369785d79538309634be7bea..e30ed1fa9281de35f5d2430468cfa53ca4ac239c 100644
--- a/lib/std/io.zig
+++ b/lib/std/io.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const root = @import("root");
diff --git a/lib/std/io/bit_in_stream.zig b/lib/std/io/bit_in_stream.zig
index 7759927e6d3a2897f036454bbfedf3c4d4768085..a027deb802d91e8b79a86d4b1891c483bd48c0d7 100644
--- a/lib/std/io/bit_in_stream.zig
+++ b/lib/std/io/bit_in_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.bit_reader.BitReader`
 pub const BitInStream = @import("./bit_reader.zig").BitReader;
 
diff --git a/lib/std/io/bit_out_stream.zig b/lib/std/io/bit_out_stream.zig
index 20a3795d5908ff15505495495714bc57f962b671..171fb542da1ce7c99f56fadd5385c3a52d05ed62 100644
--- a/lib/std/io/bit_out_stream.zig
+++ b/lib/std/io/bit_out_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.bit_writer.BitWriter`
 pub const BitOutStream = @import("./bit_writer.zig").BitWriter;
 
diff --git a/lib/std/io/bit_reader.zig b/lib/std/io/bit_reader.zig
index fbdf7fbe78c4234d2e8fea1ff860ead19ac8695e..4ea2ed75a066fac8fc835c7a8efd504b0694e51c 100644
--- a/lib/std/io/bit_reader.zig
+++ b/lib/std/io/bit_reader.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/bit_writer.zig b/lib/std/io/bit_writer.zig
index 7c1d3e5dba94493f06ba9187e56d59ae81a9fc50..de95e5440427de2b9642d147e78678228e4a3bb0 100644
--- a/lib/std/io/bit_writer.zig
+++ b/lib/std/io/bit_writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/buffered_atomic_file.zig b/lib/std/io/buffered_atomic_file.zig
index 3a3deb43bf2b61a9ad26440a5c4aa909c0b6cc84..6284d4e44fca35c9f95c580a9e128175b264d478 100644
--- a/lib/std/io/buffered_atomic_file.zig
+++ b/lib/std/io/buffered_atomic_file.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 const fs = std.fs;
diff --git a/lib/std/io/buffered_in_stream.zig b/lib/std/io/buffered_in_stream.zig
index 42ec0a5d6a16b991753970cd30c1dd7d253d00fd..f055978152de8daa66270a7e5b17a4678942911c 100644
--- a/lib/std/io/buffered_in_stream.zig
+++ b/lib/std/io/buffered_in_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.buffered_reader.BufferedReader`
 pub const BufferedInStream = @import("./buffered_reader.zig").BufferedReader;
 
diff --git a/lib/std/io/buffered_out_stream.zig b/lib/std/io/buffered_out_stream.zig
index 6f9efa9575d330b72dac730fc348ae3c3c529878..5f1eaa6fafb988ee36ec5beb6e6c1f1434611380 100644
--- a/lib/std/io/buffered_out_stream.zig
+++ b/lib/std/io/buffered_out_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.buffered_writer.BufferedWriter`
 pub const BufferedOutStream = @import("./buffered_writer.zig").BufferedWriter;
 
diff --git a/lib/std/io/buffered_reader.zig b/lib/std/io/buffered_reader.zig
index 73d74b465f5d08cdaefdde74e5e546a55ed8eaeb..58c4f3b4fc734dd79cec6f972ca92cf6fa5224a6 100644
--- a/lib/std/io/buffered_reader.zig
+++ b/lib/std/io/buffered_reader.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const assert = std.debug.assert;
diff --git a/lib/std/io/buffered_writer.zig b/lib/std/io/buffered_writer.zig
index a970f899d63d8461c5abb59644f16f200d30c287..bee3ff48aff7157ce60b66c0e485131075e6059b 100644
--- a/lib/std/io/buffered_writer.zig
+++ b/lib/std/io/buffered_writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 
diff --git a/lib/std/io/c_out_stream.zig b/lib/std/io/c_out_stream.zig
index e10795ae0a04156dd7f57f2ed0a118219815c4df..69f4d9f5af43ceb413552027be3a57684040f542 100644
--- a/lib/std/io/c_out_stream.zig
+++ b/lib/std/io/c_out_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.c_writer.CWriter`
 pub const COutStream = @import("./c_writer.zig").CWriter;
 
diff --git a/lib/std/io/c_writer.zig b/lib/std/io/c_writer.zig
index 6292450223fce541aa708d7cac1c41cc34e924a0..9fd10d827e91f4ac206e69e1a8c37c3a1dc3ab45 100644
--- a/lib/std/io/c_writer.zig
+++ b/lib/std/io/c_writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/counting_out_stream.zig b/lib/std/io/counting_out_stream.zig
index 5b0b35b4c5615ed9d79d7af480d395c90aea854f..fecdf8adb0bc5e6788d76fb6941b0259aa639cec 100644
--- a/lib/std/io/counting_out_stream.zig
+++ b/lib/std/io/counting_out_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.counting_writer.CountingWriter`
 pub const CountingOutStream = @import("./counting_writer.zig").CountingWriter;
 
diff --git a/lib/std/io/counting_writer.zig b/lib/std/io/counting_writer.zig
index c0cd53c7eed15cd264f113734a07494dca29f4e3..aefd459b90cfb46448e94b8aefc8c20206241e3a 100644
--- a/lib/std/io/counting_writer.zig
+++ b/lib/std/io/counting_writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/fixed_buffer_stream.zig b/lib/std/io/fixed_buffer_stream.zig
index 32625f3b7afd3f0fae659af2d8926e4e9b73f4f3..b1d2aaf89a3eaf237ae47513f97808b9ed28ef97 100644
--- a/lib/std/io/fixed_buffer_stream.zig
+++ b/lib/std/io/fixed_buffer_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/in_stream.zig b/lib/std/io/in_stream.zig
index c58f5d7b7723a92edb73f305e5b0c17477bf76ec..4583591d42d9f5de716988af0546743457847c99 100644
--- a/lib/std/io/in_stream.zig
+++ b/lib/std/io/in_stream.zig
@@ -1,2 +1,7 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.reader.Reader`
 pub const InStream = @import("./reader.zig").Reader;
diff --git a/lib/std/io/multi_out_stream.zig b/lib/std/io/multi_out_stream.zig
index fa7a60de51e0507ede9a7435c5054ddbba8d4e1e..7b96cc3d152b400f22c02e5ba0ed5ff1a4998dce 100644
--- a/lib/std/io/multi_out_stream.zig
+++ b/lib/std/io/multi_out_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.multi_writer.MultiWriter`
 pub const MultiOutStream = @import("./multi_writer.zig").MultiWriter;
 
diff --git a/lib/std/io/multi_writer.zig b/lib/std/io/multi_writer.zig
index e63940bff7f151f10f6d23e66763fc14352312aa..7ee43eddebba83d9ab000e6e71c8c156cd2dd7c3 100644
--- a/lib/std/io/multi_writer.zig
+++ b/lib/std/io/multi_writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/out_stream.zig b/lib/std/io/out_stream.zig
index a3fe3e32b5609d84db143f054e68e85eba7709c8..c937ccf16a10dd984aa317cfe4566918b8d3c774 100644
--- a/lib/std/io/out_stream.zig
+++ b/lib/std/io/out_stream.zig
@@ -1,2 +1,7 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Deprecated: use `std.io.writer.Writer`
 pub const OutStream = @import("./writer.zig").Writer;
diff --git a/lib/std/io/peek_stream.zig b/lib/std/io/peek_stream.zig
index 08e940c6ecbbb0dce197c649b2d159c7df6a2966..82554d05ca89f3a70a75774cbf5cc501e72c1833 100644
--- a/lib/std/io/peek_stream.zig
+++ b/lib/std/io/peek_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const mem = std.mem;
diff --git a/lib/std/io/reader.zig b/lib/std/io/reader.zig
index 4c682e8abaf80d8cef5eb2b100b5217f8a199046..07327a431d888f3cdd2d70ea92dbd8da469c5298 100644
--- a/lib/std/io/reader.zig
+++ b/lib/std/io/reader.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const math = std.math;
diff --git a/lib/std/io/seekable_stream.zig b/lib/std/io/seekable_stream.zig
index 1aa653dbe52cc6297c94b0422c35c74b46515b6c..15e537baa2b0f2c4ce5b12456c1289cd98877384 100644
--- a/lib/std/io/seekable_stream.zig
+++ b/lib/std/io/seekable_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 
 pub fn SeekableStream(
diff --git a/lib/std/io/serialization.zig b/lib/std/io/serialization.zig
index 317dde6417122b3157011e38f3baebf196549ea0..4f8c149b471c25f54b60ece157cc8b8a9e6ab5b7 100644
--- a/lib/std/io/serialization.zig
+++ b/lib/std/io/serialization.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/stream_source.zig b/lib/std/io/stream_source.zig
index 63d9ea9f2e758bba63478d3172021e154d0ffe94..3bfe0d2e6420a31fc83728c1e2342384bc50f6ae 100644
--- a/lib/std/io/stream_source.zig
+++ b/lib/std/io/stream_source.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const io = std.io;
 const testing = std.testing;
diff --git a/lib/std/io/test.zig b/lib/std/io/test.zig
index 779f52a2aaa02c84c3b5f666f7beb5c5b55773ad..ecad26a4485fc739b7caa4c21e670d27271226ad 100644
--- a/lib/std/io/test.zig
+++ b/lib/std/io/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const io = std.io;
diff --git a/lib/std/io/writer.zig b/lib/std/io/writer.zig
index a98e3b1acd78368ef4af2ea033ff5f0dfc4c5b81..39729ef0a254a08caa1ea3111cff7c23f3a9963b 100644
--- a/lib/std/io/writer.zig
+++ b/lib/std/io/writer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const mem = std.mem;
diff --git a/lib/std/json.zig b/lib/std/json.zig
index 59c765ac421ed3efa3de221fdd55f95e17e42ff3..2f8a70d0effe752c4b39a55476b2a916f306ca0b 100644
--- a/lib/std/json.zig
+++ b/lib/std/json.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // JSON parser conforming to RFC8259.
 //
 // https://tools.ietf.org/html/rfc8259
diff --git a/lib/std/json/test.zig b/lib/std/json/test.zig
index ed7454cce333bb1bc767d032c6eefb74b5bd2735..3a7c25e3834a8b59562df2a74b810c6ee26f58a8 100644
--- a/lib/std/json/test.zig
+++ b/lib/std/json/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // RFC 8529 conformance tests.
 //
 // Tests are taken from https://github.com/nst/JSONTestSuite
diff --git a/lib/std/json/write_stream.zig b/lib/std/json/write_stream.zig
index 778173cc243c82af023f85df2304e2f5ce88f643..59bebd69d3619036706547bedf7b6b411a50c785 100644
--- a/lib/std/json/write_stream.zig
+++ b/lib/std/json/write_stream.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const maxInt = std.math.maxInt;
diff --git a/lib/std/linked_list.zig b/lib/std/linked_list.zig
index 39f52021b2c17c19c5bbba50a19d86f6ba9e516a..e99f3d8725b6fdcdd1a70761705b9ddb804ec746 100644
--- a/lib/std/linked_list.zig
+++ b/lib/std/linked_list.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/log.zig b/lib/std/log.zig
index 8d5554aa46c95b5ccbf3e1aa93517b8c4fe2afea..50bdfdc0680d7f81c63bca1f04fc123936071e4d 100644
--- a/lib/std/log.zig
+++ b/lib/std/log.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const root = @import("root");
diff --git a/lib/std/macho.zig b/lib/std/macho.zig
index 950283b59f7b950c48c030485882a8781e328823..99a8cd776c1f66635deeacc7a40b60bb8a90b609 100644
--- a/lib/std/macho.zig
+++ b/lib/std/macho.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const mach_header = extern struct {
     magic: u32,
     cputype: cpu_type_t,
diff --git a/lib/std/math.zig b/lib/std/math.zig
index 2c9065a89e4e88281439ccc5293af05b71c05959..a76f0a391dcc152b06e9bdf86c1e7321cd018787 100644
--- a/lib/std/math.zig
+++ b/lib/std/math.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/math/acos.zig b/lib/std/math/acos.zig
index cdd86601fd80c20e27e01ecf5de9f85ccd980792..f085680176a3494dd87e8fea41021b02be7bc51f 100644
--- a/lib/std/math/acos.zig
+++ b/lib/std/math/acos.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/acosh.zig b/lib/std/math/acosh.zig
index 9a594f9cc4ab413a8aa132ef07e1b13f4f28cb6c..76d6edff3ec120749b6f57e0746f082c62caaa9e 100644
--- a/lib/std/math/acosh.zig
+++ b/lib/std/math/acosh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/asin.zig b/lib/std/math/asin.zig
index 4cff69fc1bf1b5e3834facb506a4f07b0ecb3a77..a4a19c74d97b7248b053ddc86d6eb94397f9f434 100644
--- a/lib/std/math/asin.zig
+++ b/lib/std/math/asin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/asinh.zig b/lib/std/math/asinh.zig
index 940b953d06b7b331aadda9c9a9f29c30c13e4df6..dc97ac3082de3cba9184b9d2f9e62370b4922b8c 100644
--- a/lib/std/math/asinh.zig
+++ b/lib/std/math/asinh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/atan.zig b/lib/std/math/atan.zig
index 9342b6ed594cbbfae3367d3965abf73436f75210..390e10b3c4d4672dadcbd837c45617ba11d26432 100644
--- a/lib/std/math/atan.zig
+++ b/lib/std/math/atan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/atan2.zig b/lib/std/math/atan2.zig
index 68e381607dd341fa5eec537aa2734aec97493ece..6540eced840e2f8f22bfc2defe05a4a1a912b8f3 100644
--- a/lib/std/math/atan2.zig
+++ b/lib/std/math/atan2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/atanh.zig b/lib/std/math/atanh.zig
index de742bd4cdff2c283071ce6612b14e2704343e33..abd573bb1a1de562c32c30e6e7a439dff4f3f2c0 100644
--- a/lib/std/math/atanh.zig
+++ b/lib/std/math/atanh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/big.zig b/lib/std/math/big.zig
index ab651c05c69c203296593d5806a982a3112a37f5..6246a4fb8bcec9fcb183c2b064e71c39094742a8 100644
--- a/lib/std/math/big.zig
+++ b/lib/std/math/big.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 
diff --git a/lib/std/math/big/int.zig b/lib/std/math/big/int.zig
index 92b3f80429db973d5780ef90e4987008dc9df3df..adb58489317b2235bd64aeac2053c96c5493a28e 100644
--- a/lib/std/math/big/int.zig
+++ b/lib/std/math/big/int.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const math = std.math;
 const Limb = std.math.big.Limb;
diff --git a/lib/std/math/big/int_test.zig b/lib/std/math/big/int_test.zig
index a86b55d2dead9960b35b952a0e66ea21788a5a91..5931767a820afa24645cc6b553669bd3c38c2359 100644
--- a/lib/std/math/big/int_test.zig
+++ b/lib/std/math/big/int_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const mem = std.mem;
 const testing = std.testing;
diff --git a/lib/std/math/big/rational.zig b/lib/std/math/big/rational.zig
index 6f62a462b8739ebdd3b78b9a0639a38983889d3d..e83139cf370cf716bd58158709cf6362afd2c8db 100644
--- a/lib/std/math/big/rational.zig
+++ b/lib/std/math/big/rational.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const debug = std.debug;
 const math = std.math;
diff --git a/lib/std/math/cbrt.zig b/lib/std/math/cbrt.zig
index 42163b96dcfb2c32fe4f8ad12aa521fec812e53f..0d097a0c7562c09b4dbd05ce213a674df0c63b60 100644
--- a/lib/std/math/cbrt.zig
+++ b/lib/std/math/cbrt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/ceil.zig b/lib/std/math/ceil.zig
index 39de46f361617812397c6c7a46e409d18d108833..ac04c9a8cc2248fee60e8ebdb39077bb90eb35f1 100644
--- a/lib/std/math/ceil.zig
+++ b/lib/std/math/ceil.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex.zig b/lib/std/math/complex.zig
index 8bff2313fc1def2eadb1bd05e1184710288cbf45..ec76f425ebe043c64c5c772876ab687b80b72f27 100644
--- a/lib/std/math/complex.zig
+++ b/lib/std/math/complex.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/abs.zig b/lib/std/math/complex/abs.zig
index db31aef42ad124dded6233d91ff19734437e811f..db9c43e89d10310cc5957fc78914d22e8c3ca702 100644
--- a/lib/std/math/complex/abs.zig
+++ b/lib/std/math/complex/abs.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/acos.zig b/lib/std/math/complex/acos.zig
index 072fd77f08910016593b91c36da6cb85109e9c21..1372c280e2c4a33ccb57008762583f3871636063 100644
--- a/lib/std/math/complex/acos.zig
+++ b/lib/std/math/complex/acos.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/acosh.zig b/lib/std/math/complex/acosh.zig
index 59117a8b270b8c957a563b8b9af456c1b5008196..49d9fd030240559c2aa37c22c4dde5a4db94ed79 100644
--- a/lib/std/math/complex/acosh.zig
+++ b/lib/std/math/complex/acosh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/arg.zig b/lib/std/math/complex/arg.zig
index 6cf959a081db87be0413f93c01bccb81e98650cc..7cfbc8bd0ff79aa195668c94b9781b9d9238335e 100644
--- a/lib/std/math/complex/arg.zig
+++ b/lib/std/math/complex/arg.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/asin.zig b/lib/std/math/complex/asin.zig
index 9f7cd396aaf664fcdc31531f69303a3ec8394a1d..5c5de3ff4f1c2c98b8e91d79e99d8b141a1c5666 100644
--- a/lib/std/math/complex/asin.zig
+++ b/lib/std/math/complex/asin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/asinh.zig b/lib/std/math/complex/asinh.zig
index 0c3c2bd115556488a9fb4a4c87f867fe7d2aa876..a3f5f04fbc305d897f8002680f1f4a8278570f09 100644
--- a/lib/std/math/complex/asinh.zig
+++ b/lib/std/math/complex/asinh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/atan.zig b/lib/std/math/complex/atan.zig
index 98bde3e125a7e85a4ee93e7b3dd55cf64f25a5f9..e5c49976ac0e7dc31cfa203b6591ebb4e3957ea8 100644
--- a/lib/std/math/complex/atan.zig
+++ b/lib/std/math/complex/atan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/atanh.zig b/lib/std/math/complex/atanh.zig
index a07c2969e49b1ab6e717a9233e8cb9661705fdd3..4ab24102580715323c59463bf999cf227d0d6840 100644
--- a/lib/std/math/complex/atanh.zig
+++ b/lib/std/math/complex/atanh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/conj.zig b/lib/std/math/complex/conj.zig
index 42a34e7dfcb09cf731497d7800887f3c304390c8..159469da86c3668c3bfad71f521e5d3c9b256761 100644
--- a/lib/std/math/complex/conj.zig
+++ b/lib/std/math/complex/conj.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/cos.zig b/lib/std/math/complex/cos.zig
index 9daf89c7302f6472f8581018e5a24b4923a2b95f..559613cc341a99f412858ea1fbb0d9cb3613393c 100644
--- a/lib/std/math/complex/cos.zig
+++ b/lib/std/math/complex/cos.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/cosh.zig b/lib/std/math/complex/cosh.zig
index bd51629bd4f6b1eb4aba3055960a0e51c0e93147..f668cb60cee2d84b1c1369ab3b358c86a73a1e2a 100644
--- a/lib/std/math/complex/cosh.zig
+++ b/lib/std/math/complex/cosh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/exp.zig b/lib/std/math/complex/exp.zig
index 6f6061a94762d31d580c845faf45993e29a0c739..3ad51fe06fefc93962705ccc2ee8d6bf01f48b68 100644
--- a/lib/std/math/complex/exp.zig
+++ b/lib/std/math/complex/exp.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/ldexp.zig b/lib/std/math/complex/ldexp.zig
index c23b9b346e0ceb5cea2fd8cf3a3a501b94c9cef0..b1cf8a0e42b954b9eaa84b0141fdb32fb7ad107f 100644
--- a/lib/std/math/complex/ldexp.zig
+++ b/lib/std/math/complex/ldexp.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/log.zig b/lib/std/math/complex/log.zig
index ec02c6c32570d438dc3ca7ce0425fd50abfa94a2..cb719f4b312d0e4d2285b755deed6603f013c6a7 100644
--- a/lib/std/math/complex/log.zig
+++ b/lib/std/math/complex/log.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/pow.zig b/lib/std/math/complex/pow.zig
index a2480453fc9b0984390572e8e861bca86b9f52e2..7be38cadf20b3b1c62a74e2ed45a5bc8ab27f876 100644
--- a/lib/std/math/complex/pow.zig
+++ b/lib/std/math/complex/pow.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/proj.zig b/lib/std/math/complex/proj.zig
index e208ae037002124d09696edc9e30c3bc8f2772dc..67f087f8baaa5de675ba7a6c459ad68351f0f19c 100644
--- a/lib/std/math/complex/proj.zig
+++ b/lib/std/math/complex/proj.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/sin.zig b/lib/std/math/complex/sin.zig
index 1b10f8fca6fecae820be38ca57a5c967c21f74cd..2f33e13354cf83aee1c3e6909152b17d246b8121 100644
--- a/lib/std/math/complex/sin.zig
+++ b/lib/std/math/complex/sin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/sinh.zig b/lib/std/math/complex/sinh.zig
index 32f2a730fbebffe3bfd7b03febf012c2743ea57b..3242adef7901f265ab5ff5c3e17506e51dc17ae3 100644
--- a/lib/std/math/complex/sinh.zig
+++ b/lib/std/math/complex/sinh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/sqrt.zig b/lib/std/math/complex/sqrt.zig
index 0edb02a7a96c8d174050d24e98fc54d01a0dfc8f..8abb9a6064cb34e96b671357c681ffcee50ddb93 100644
--- a/lib/std/math/complex/sqrt.zig
+++ b/lib/std/math/complex/sqrt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/complex/tan.zig b/lib/std/math/complex/tan.zig
index 050898c5732288442854729909c10d02de5bb134..adcda786c1c2f6bc10332b832b6ea0ca021f712d 100644
--- a/lib/std/math/complex/tan.zig
+++ b/lib/std/math/complex/tan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const testing = std.testing;
 const math = std.math;
diff --git a/lib/std/math/complex/tanh.zig b/lib/std/math/complex/tanh.zig
index 1d614cca583d21917922cdbe7d9b9fbfbee1f17d..fd631149820be6d66598a76a53afaa4f2f7786ce 100644
--- a/lib/std/math/complex/tanh.zig
+++ b/lib/std/math/complex/tanh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/copysign.zig b/lib/std/math/copysign.zig
index e874da0bb941a004c09af718a8650b195326f7fc..1547382cbde7e5bdb70f3e6de83f951f4150fa8b 100644
--- a/lib/std/math/copysign.zig
+++ b/lib/std/math/copysign.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/cos.zig b/lib/std/math/cos.zig
index df5c0a53be403e37246772a71eb3e44ffe2ed545..3d282c82e10e5ece9a62d7e7099a1ac3c36a5021 100644
--- a/lib/std/math/cos.zig
+++ b/lib/std/math/cos.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/cosh.zig b/lib/std/math/cosh.zig
index bab47dcdbdaf69fe32c5511242ce2dd2f83f7e4d..221ebcf08964cfc195fed110b2f8722af3648a07 100644
--- a/lib/std/math/cosh.zig
+++ b/lib/std/math/cosh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/exp.zig b/lib/std/math/exp.zig
index c84d929adfe621cbdb4821495df37b2ff38b3348..36d18f83b25cbceae40ea4bd6cdfef6bec1ed287 100644
--- a/lib/std/math/exp.zig
+++ b/lib/std/math/exp.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/exp2.zig b/lib/std/math/exp2.zig
index da391189b2084b082106274054ae4a7b8783f9a0..b97690948ec28321657d7181fe7c0096e88bc4fa 100644
--- a/lib/std/math/exp2.zig
+++ b/lib/std/math/exp2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/expm1.zig b/lib/std/math/expm1.zig
index 80cdefae20b703d590d9717de294343d264de7d8..98e66b17d5532aba91f2bfd1954b19245106ec8f 100644
--- a/lib/std/math/expm1.zig
+++ b/lib/std/math/expm1.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/expo2.zig b/lib/std/math/expo2.zig
index f404570fb6928095d708f35804385f283c86634c..a81c9920e02312e70d157d69467236b29ef11e39 100644
--- a/lib/std/math/expo2.zig
+++ b/lib/std/math/expo2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/fabs.zig b/lib/std/math/fabs.zig
index ca91f594fdc2467c1fa081ca0b51c81de0d9518b..f263bfbc5811bd63336dcf5c5434d2fd8812efb8 100644
--- a/lib/std/math/fabs.zig
+++ b/lib/std/math/fabs.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/floor.zig b/lib/std/math/floor.zig
index 3a71cc7cdf5dd5f26451230570517a277e849479..7b61980a5e611e65e016d42c74822258111f42ac 100644
--- a/lib/std/math/floor.zig
+++ b/lib/std/math/floor.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/fma.zig b/lib/std/math/fma.zig
index 014593cda5f95696a0a1a0b7222e3f674cdd4e69..6993fc978648f26be94da69a027743339aa921bf 100644
--- a/lib/std/math/fma.zig
+++ b/lib/std/math/fma.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/frexp.zig b/lib/std/math/frexp.zig
index 0e4558dc3705b3cfa14727f91d148d398716dd05..2d99c85c51f589766c2ef1db5e59ae9085db9fad 100644
--- a/lib/std/math/frexp.zig
+++ b/lib/std/math/frexp.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/hypot.zig b/lib/std/math/hypot.zig
index 59116014b3ed37f46628d3f0a706c3f0696aceb1..595563076bde1d0777a9941b8dde56da6d415372 100644
--- a/lib/std/math/hypot.zig
+++ b/lib/std/math/hypot.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/ilogb.zig b/lib/std/math/ilogb.zig
index 748cf9ea0da6101f019abf8903c51ac5c6ebd784..a6fb03197330c3dcbbff8edbcb65ee8ed91b73d8 100644
--- a/lib/std/math/ilogb.zig
+++ b/lib/std/math/ilogb.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/inf.zig b/lib/std/math/inf.zig
index 86ff2455332ed188f7a9f9d4fbb6e5d598afa810..f2e0283e0302c92cc86595cd7c876e903ab8654e 100644
--- a/lib/std/math/inf.zig
+++ b/lib/std/math/inf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 
diff --git a/lib/std/math/isfinite.zig b/lib/std/math/isfinite.zig
index 0681eae0b755f020053a350e404f9386004a5266..938c495d655246c65c08b2df0a343eaa779efc20 100644
--- a/lib/std/math/isfinite.zig
+++ b/lib/std/math/isfinite.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/isinf.zig b/lib/std/math/isinf.zig
index 19357d89d157674c44445873cbaecbbb9ca93720..2ecd9c2b9c9a0189634c2e5d4ea79fefa54661c4 100644
--- a/lib/std/math/isinf.zig
+++ b/lib/std/math/isinf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/isnan.zig b/lib/std/math/isnan.zig
index 797c115d1dda5e397331b2941e573982b74c6db9..fc58e7334c63ac931b57d362ecbd13f6a2005455 100644
--- a/lib/std/math/isnan.zig
+++ b/lib/std/math/isnan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/isnormal.zig b/lib/std/math/isnormal.zig
index a3144f2784a2e42c38059296df7948f11a6e61ed..b9ff515bdc90394f43daf3d26e6f7ddcad07240b 100644
--- a/lib/std/math/isnormal.zig
+++ b/lib/std/math/isnormal.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/ln.zig b/lib/std/math/ln.zig
index 99e54c4cc76c7dc91bd976bc2420066b6e437b0e..60a2f528aae17bc10bdc74a36a2ebc55e3df6645 100644
--- a/lib/std/math/ln.zig
+++ b/lib/std/math/ln.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log.zig b/lib/std/math/log.zig
index 6f5025cd50b0fe98a1f7f2de1d257b85e1888dd9..4286b74960704108a3781f780a5d2bb71155c262 100644
--- a/lib/std/math/log.zig
+++ b/lib/std/math/log.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log10.zig b/lib/std/math/log10.zig
index e55bd8c1e879a643c5129bb593473e9d9ff5dcbd..d7d192a564af299d1ee098a6908f3e9be42f7e02 100644
--- a/lib/std/math/log10.zig
+++ b/lib/std/math/log10.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log1p.zig b/lib/std/math/log1p.zig
index e24ba8d84d7d3bd6a7f0e9241e4b668e3242d1e2..5a87e92313ed96bb5e85b909752b38e3c4dd0dc0 100644
--- a/lib/std/math/log1p.zig
+++ b/lib/std/math/log1p.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/log2.zig b/lib/std/math/log2.zig
index 95d06a2b60b80a0b9d45f6281f1ebe3affd2257f..2b9fbe3d84209c7ad1d36fa24032b783ae99946c 100644
--- a/lib/std/math/log2.zig
+++ b/lib/std/math/log2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/modf.zig b/lib/std/math/modf.zig
index 5ab5318a79cd95a5f6cddb94b75ad0172cdf8a78..830b99257ec990bb59a3fb02013b1022db155c31 100644
--- a/lib/std/math/modf.zig
+++ b/lib/std/math/modf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/nan.zig b/lib/std/math/nan.zig
index 5a01a5b3bdac95593a334f3d6cb5029ef68b2565..b8e3b517e22f8abe7752d11b37e29b677461d2a9 100644
--- a/lib/std/math/nan.zig
+++ b/lib/std/math/nan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const math = @import("../math.zig");
 
 /// Returns the nan representation for type T.
diff --git a/lib/std/math/pow.zig b/lib/std/math/pow.zig
index cb39dd59e3ad6ec38cd97476ba4db7ff74f526a2..30b52acbda65b0bfcb78001711a61da259ddce00 100644
--- a/lib/std/math/pow.zig
+++ b/lib/std/math/pow.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/powi.zig b/lib/std/math/powi.zig
index ce3a3713e3a800db9a0d96e417d2a612432ef251..660aeddc0548444cc6440ae5aefd1397080761a9 100644
--- a/lib/std/math/powi.zig
+++ b/lib/std/math/powi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Based on Rust, which is licensed under the MIT license.
 // https://github.com/rust-lang/rust/blob/360432f1e8794de58cd94f34c9c17ad65871e5b5/LICENSE-MIT
 //
diff --git a/lib/std/math/round.zig b/lib/std/math/round.zig
index 854adee4baae2f1198dfeb41f2e7d4f00515f382..7798e6157ae4f6527ffb83af50a105389a9ea88a 100644
--- a/lib/std/math/round.zig
+++ b/lib/std/math/round.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/scalbn.zig b/lib/std/math/scalbn.zig
index 71a8110ce71e8f41fe2f3eac72c70cde4c4931ff..7243084dd4133d5c480e1aae084b1db81f7a000d 100644
--- a/lib/std/math/scalbn.zig
+++ b/lib/std/math/scalbn.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/signbit.zig b/lib/std/math/signbit.zig
index 49397f7bd4546abba8df534711efb92c98c92e9f..defd02aa3ab395def1e127ebbd28951c31fd0ccb 100644
--- a/lib/std/math/signbit.zig
+++ b/lib/std/math/signbit.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/sin.zig b/lib/std/math/sin.zig
index df3b294ca6409db0c974ce954dcf8c78babcd5d8..c7db4f862384e9174d0e844f083aee22daa55a5f 100644
--- a/lib/std/math/sin.zig
+++ b/lib/std/math/sin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/sinh.zig b/lib/std/math/sinh.zig
index 26e0e05f38b3886324b7c26572bb502e13736efd..1246c89cc06656b1a9aee345961bde3108b7774c 100644
--- a/lib/std/math/sinh.zig
+++ b/lib/std/math/sinh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/sqrt.zig b/lib/std/math/sqrt.zig
index 2f0d2514324cb072f62c93cb04e123fd3a7c2746..34851ca64718617bbc5817da0407d153ef6455df 100644
--- a/lib/std/math/sqrt.zig
+++ b/lib/std/math/sqrt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const math = std.math;
 const expect = std.testing.expect;
diff --git a/lib/std/math/tan.zig b/lib/std/math/tan.zig
index 2cd5a407dfb280366e33dd7d45e53af466e43c8e..5e5a80e15d8cd3e5bdadfd76b84468c606d092f3 100644
--- a/lib/std/math/tan.zig
+++ b/lib/std/math/tan.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from go, which is licensed under a BSD-3 license.
 // https://golang.org/LICENSE
 //
diff --git a/lib/std/math/tanh.zig b/lib/std/math/tanh.zig
index 7697db5271769602c8bf105816db5675580b99c8..3abc5d4d75872feab0b798ac87db30ea55063a02 100644
--- a/lib/std/math/tanh.zig
+++ b/lib/std/math/tanh.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/math/trunc.zig b/lib/std/math/trunc.zig
index df24b77111184fae8a796f106c3f83f4e05caed2..85bc68f226ea205ad387279bc5cf8c7fa82422dc 100644
--- a/lib/std/math/trunc.zig
+++ b/lib/std/math/trunc.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from musl, which is licensed under the MIT license:
 // https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
 //
diff --git a/lib/std/mem.zig b/lib/std/mem.zig
index 1ba64f47fa9da2d832b225c7916010e490ce32dc..33977e3ce348080b4d0f28ddcdea685752e6e269 100644
--- a/lib/std/mem.zig
+++ b/lib/std/mem.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const debug = std.debug;
 const assert = debug.assert;
diff --git a/lib/std/mem/Allocator.zig b/lib/std/mem/Allocator.zig
index e73050165e0e308691108d62befc701ff619bf7c..bb59de2a7e70710ae10645d8cabeb4b5e1033612 100644
--- a/lib/std/mem/Allocator.zig
+++ b/lib/std/mem/Allocator.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 //! The standard memory allocation interface.
 
 const std = @import("../std.zig");
diff --git a/lib/std/meta.zig b/lib/std/meta.zig
index 6340a44fae866ce5ce3fc1f1e2f49aa744b2b17f..aaa8e7ca7818912438e2ab57a6e19792f5563de4 100644
--- a/lib/std/meta.zig
+++ b/lib/std/meta.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const debug = std.debug;
diff --git a/lib/std/meta/trailer_flags.zig b/lib/std/meta/trailer_flags.zig
index 0da7ca815a1f31b849063bc7d218bc44b98549dd..6e1d8bea3286bee10bcf92226127d0571c0a0c77 100644
--- a/lib/std/meta/trailer_flags.zig
+++ b/lib/std/meta/trailer_flags.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const meta = std.meta;
 const testing = std.testing;
diff --git a/lib/std/meta/trait.zig b/lib/std/meta/trait.zig
index f04d6353c6c9b0d85d1c68cba3c4bb62191de38f..2455542e4fccfb2994d84a23422bf6e40df065d8 100644
--- a/lib/std/meta/trait.zig
+++ b/lib/std/meta/trait.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const mem = std.mem;
diff --git a/lib/std/mutex.zig b/lib/std/mutex.zig
index 3361a42e21c2c2b1ea541d61fc3fc743a000a920..706685d1fa5858bf521d98992e20b89a78e64212 100644
--- a/lib/std/mutex.zig
+++ b/lib/std/mutex.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const os = std.os;
diff --git a/lib/std/net.zig b/lib/std/net.zig
index 0cd34376e1485599e4bb26c88989343b365d6831..10e5b371f8162eec8cd89bf5a53936ac1bd34ea0 100644
--- a/lib/std/net.zig
+++ b/lib/std/net.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/net/test.zig b/lib/std/net/test.zig
index 89b84ac83dd3d074ac68d8e078ead31099ed5c99..815ee81d7fd098a2f66aa6d220eb305cb1e4a229 100644
--- a/lib/std/net/test.zig
+++ b/lib/std/net/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const builtin = std.builtin;
 const net = std.net;
diff --git a/lib/std/once.zig b/lib/std/once.zig
index cf42d021a24eb548576a5084b18df0b871103cf8..6e0e4867d864db097b1b9e68596c7e08d67f37ce 100644
--- a/lib/std/once.zig
+++ b/lib/std/once.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const testing = std.testing;
diff --git a/lib/std/os.zig b/lib/std/os.zig
index 6f58d7f077aef0da013c6c8b46422bd317bf5fa4..e8431c386bbc19c5cd7e1cda450d70ec7ef7e057 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // This file contains thin wrappers around OS-specific APIs, with these
 // specific goals in mind:
 // * Convert "errno"-style error codes into Zig errors.
diff --git a/lib/std/os/bits.zig b/lib/std/os/bits.zig
index 38f019d775a199030aa98889f2e6b28adb3dcb21..177b7daad2c9a0c1f9d3949625bad5e817fc62c5 100644
--- a/lib/std/os/bits.zig
+++ b/lib/std/os/bits.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 //! Platform-dependent types and values that are used along with OS-specific APIs.
 //! These are imported into `std.c`, `std.os`, and `std.os.linux`.
 //! Root source files can define `os.bits` and these will additionally be added
diff --git a/lib/std/os/bits/darwin.zig b/lib/std/os/bits/darwin.zig
index 4581490e6f0c574302801e40e483c9c9ea526a5b..375127f27819975ae90924b89501b48d75d78f2c 100644
--- a/lib/std/os/bits/darwin.zig
+++ b/lib/std/os/bits/darwin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const assert = std.debug.assert;
 const maxInt = std.math.maxInt;
diff --git a/lib/std/os/bits/dragonfly.zig b/lib/std/os/bits/dragonfly.zig
index df2267832341dce9f3aa4181dfd49e6ea55d1334..8b6d6be2120a1b4a531eb6dcb5825374dcd7a57e 100644
--- a/lib/std/os/bits/dragonfly.zig
+++ b/lib/std/os/bits/dragonfly.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const maxInt = std.math.maxInt;
 
diff --git a/lib/std/os/bits/freebsd.zig b/lib/std/os/bits/freebsd.zig
index 3622fb7641297651347a17e2d495dcdfb9d1bfc2..22edf4b9d15e09eb2252e3a03c039d82275d1ddc 100644
--- a/lib/std/os/bits/freebsd.zig
+++ b/lib/std/os/bits/freebsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const maxInt = std.math.maxInt;
 
diff --git a/lib/std/os/bits/linux.zig b/lib/std/os/bits/linux.zig
index 4ad1fc7de42ae4eb8f1832cc9686f7b72e7c9d4b..4fa8a02d3d0741a7588b0c90453186fe01c09f82 100644
--- a/lib/std/os/bits/linux.zig
+++ b/lib/std/os/bits/linux.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("../../std.zig");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/os/bits/linux/arm-eabi.zig b/lib/std/os/bits/linux/arm-eabi.zig
index b32d3ef9d4291557b1ae0031912e9eb15ee9bc71..36f1f4f44225bd1f6c5b1366d1923dfbb967848e 100644
--- a/lib/std/os/bits/linux/arm-eabi.zig
+++ b/lib/std/os/bits/linux/arm-eabi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // arm-eabi-specific declarations that are intended to be imported into the POSIX namespace.
 const std = @import("../../../std.zig");
 const linux = std.os.linux;
diff --git a/lib/std/os/bits/linux/arm64.zig b/lib/std/os/bits/linux/arm64.zig
index 0745f19fb0d1f6358a01d678b2ea9cee765488a5..6ecbcc9ae1d83b3e265d25be5a026ea586a00a3e 100644
--- a/lib/std/os/bits/linux/arm64.zig
+++ b/lib/std/os/bits/linux/arm64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // arm64-specific declarations that are intended to be imported into the POSIX namespace.
 // This does include Linux-only APIs.
 
diff --git a/lib/std/os/bits/linux/bpf.zig b/lib/std/os/bits/linux/bpf.zig
index 150d3e9135354849c65563cbd6bf490033231a7a..e86e082ff73045288c37f50b2cfc4d69e4fcb313 100644
--- a/lib/std/os/bits/linux/bpf.zig
+++ b/lib/std/os/bits/linux/bpf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace std.os;
 const std = @import("../../../std.zig");
 
diff --git a/lib/std/os/bits/linux/errno-generic.zig b/lib/std/os/bits/linux/errno-generic.zig
index 53af9cc5e578663767202c5321c9c396f980fcc8..a99f20a1a847f5c6afce70b71540ea3d6bb54b33 100644
--- a/lib/std/os/bits/linux/errno-generic.zig
+++ b/lib/std/os/bits/linux/errno-generic.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// Operation not permitted
 pub const EPERM = 1;
 
diff --git a/lib/std/os/bits/linux/errno-mips.zig b/lib/std/os/bits/linux/errno-mips.zig
index 81cbde4af4edec68fcce8f690abaaf8250b743da..125886308620abeac16e5e90c1e0d939a94c2ba4 100644
--- a/lib/std/os/bits/linux/errno-mips.zig
+++ b/lib/std/os/bits/linux/errno-mips.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const EPERM = 1;
 pub const ENOENT = 2;
 pub const ESRCH = 3;
diff --git a/lib/std/os/bits/linux/i386.zig b/lib/std/os/bits/linux/i386.zig
index 868e4f537b51b846492d4ab06f243e361c7fcc68..a560c146133014556daacda62a5cc0f5f0c8e59f 100644
--- a/lib/std/os/bits/linux/i386.zig
+++ b/lib/std/os/bits/linux/i386.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // i386-specific declarations that are intended to be imported into the POSIX namespace.
 // This does include Linux-only APIs.
 
diff --git a/lib/std/os/bits/linux/mips.zig b/lib/std/os/bits/linux/mips.zig
index 5946e821ad9fdb4748b50178bc49486643eab1aa..4b81c6e622ac652304c0e5d5eb61c65008f13c61 100644
--- a/lib/std/os/bits/linux/mips.zig
+++ b/lib/std/os/bits/linux/mips.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../../std.zig");
 const linux = std.os.linux;
 const socklen_t = linux.socklen_t;
diff --git a/lib/std/os/bits/linux/netlink.zig b/lib/std/os/bits/linux/netlink.zig
index f3d000e785bc31ea01b07013ba04670d0a06c4c5..3e75733b9a176ca9a36e31809611d07c50f9a216 100644
--- a/lib/std/os/bits/linux/netlink.zig
+++ b/lib/std/os/bits/linux/netlink.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../linux.zig");
 
 /// Routing/device hook
diff --git a/lib/std/os/bits/linux/riscv64.zig b/lib/std/os/bits/linux/riscv64.zig
index 220e6736226527d7cc2febfd121f8f3c4bfe5f3c..c4b0f044f28c12c8388d772cdc4cf52fdf5d9788 100644
--- a/lib/std/os/bits/linux/riscv64.zig
+++ b/lib/std/os/bits/linux/riscv64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // riscv64-specific declarations that are intended to be imported into the POSIX namespace.
 const std = @import("../../../std.zig");
 const uid_t = std.os.linux.uid_t;
diff --git a/lib/std/os/bits/linux/x86_64.zig b/lib/std/os/bits/linux/x86_64.zig
index c87bca6f8e31f17f37427c43ce10e78e4ad4ca25..0800feeddf1df3288c1df6fd2c658c56bece1d7c 100644
--- a/lib/std/os/bits/linux/x86_64.zig
+++ b/lib/std/os/bits/linux/x86_64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // x86-64-specific declarations that are intended to be imported into the POSIX namespace.
 const std = @import("../../../std.zig");
 const pid_t = linux.pid_t;
diff --git a/lib/std/os/bits/netbsd.zig b/lib/std/os/bits/netbsd.zig
index 91e101620f0cab625e80a9ebd20eaabb880a49c0..d628bf45669436bbb665c125a8969c2bad7afe9e 100644
--- a/lib/std/os/bits/netbsd.zig
+++ b/lib/std/os/bits/netbsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const builtin = std.builtin;
 const maxInt = std.math.maxInt;
diff --git a/lib/std/os/bits/wasi.zig b/lib/std/os/bits/wasi.zig
index 270345c53b513b0af00cb0964773b66ab3df5548..f768b5522ba007b8cfd386da6c2866783114be68 100644
--- a/lib/std/os/bits/wasi.zig
+++ b/lib/std/os/bits/wasi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Convenience types and consts used by std.os module
 pub const STDIN_FILENO = 0;
 pub const STDOUT_FILENO = 1;
diff --git a/lib/std/os/bits/windows.zig b/lib/std/os/bits/windows.zig
index 5316a048ccb8f6723d46add1399c8ae434880fe0..836d273c1c79e267b23c39228954665ba13f35df 100644
--- a/lib/std/os/bits/windows.zig
+++ b/lib/std/os/bits/windows.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // The reference for these types and values is Microsoft Windows's ucrt (Universal C RunTime).
 
 usingnamespace @import("../windows/bits.zig");
diff --git a/lib/std/os/darwin.zig b/lib/std/os/darwin.zig
index d3e9cefb86dd311ea01b756c6c579cb4317abad7..1bd983398b25cff2cad1b4d605b0b69963d50e10 100644
--- a/lib/std/os/darwin.zig
+++ b/lib/std/os/darwin.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("../std.zig");
 pub usingnamespace std.c;
diff --git a/lib/std/os/dragonfly.zig b/lib/std/os/dragonfly.zig
index 5f9684b96de967ee7422a2d96322c156ed2dbdbf..a713a009ad7efb65951a1cbb2ae7dee62274e608 100644
--- a/lib/std/os/dragonfly.zig
+++ b/lib/std/os/dragonfly.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/freebsd.zig b/lib/std/os/freebsd.zig
index 5f9684b96de967ee7422a2d96322c156ed2dbdbf..a713a009ad7efb65951a1cbb2ae7dee62274e608 100644
--- a/lib/std/os/freebsd.zig
+++ b/lib/std/os/freebsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index 7fe0ba00ae6c8f19c15176d478a9ce25f3076e9b..ae66e619c363522a4b2992d6a2f1ed4d97cc01fc 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // This file provides the system interface functions for Linux matching those
 // that are provided by libc, whether or not libc is linked. The following
 // abstractions are made:
diff --git a/lib/std/os/linux/arm-eabi.zig b/lib/std/os/linux/arm-eabi.zig
index 352afeeb04a2768cab9e31688e359c61837d0b44..a72799a26a55d5d892b9a157264e87929840b8fe 100644
--- a/lib/std/os/linux/arm-eabi.zig
+++ b/lib/std/os/linux/arm-eabi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/arm64.zig b/lib/std/os/linux/arm64.zig
index 49548522eca593d553c5b18ae638cba4bf1a8191..6727cbce8e5b3919036cc0d48247103bf5abd351 100644
--- a/lib/std/os/linux/arm64.zig
+++ b/lib/std/os/linux/arm64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/i386.zig b/lib/std/os/linux/i386.zig
index a4fdf8a346b73783e726188adafaeee1b2f4a408..ed5bc88f0f6d76c8977d28d6b3559090e943b046 100644
--- a/lib/std/os/linux/i386.zig
+++ b/lib/std/os/linux/i386.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/mips.zig b/lib/std/os/linux/mips.zig
index 5b5c1e1f34abaed27cefb76f86c4fd8d13befe4e..ad673e06f93324da10809f038692d1cc644e9226 100644
--- a/lib/std/os/linux/mips.zig
+++ b/lib/std/os/linux/mips.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/riscv64.zig b/lib/std/os/linux/riscv64.zig
index 39cc13f5b6a353f1db4b50f354f4deda577c3628..034340d0b356e9080045b788b01d1c81b1453b1f 100644
--- a/lib/std/os/linux/riscv64.zig
+++ b/lib/std/os/linux/riscv64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/linux/test.zig b/lib/std/os/linux/test.zig
index aa6655b7d867b438dd635cb6f3747eae24ac3059..7599cfc39508fdb8f5b7f413c0dcb1c2f35f3188 100644
--- a/lib/std/os/linux/test.zig
+++ b/lib/std/os/linux/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const builtin = @import("builtin");
 const linux = std.os.linux;
diff --git a/lib/std/os/linux/tls.zig b/lib/std/os/linux/tls.zig
index 8cba45d4b380b68fb4aaa284c2aae63e0762e83d..b10dae14d7d8b57b9882cd30d09d850abb96fe0b 100644
--- a/lib/std/os/linux/tls.zig
+++ b/lib/std/os/linux/tls.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const os = std.os;
diff --git a/lib/std/os/linux/vdso.zig b/lib/std/os/linux/vdso.zig
index 27c56d6c42a2e70c0274dd2cb8b7131ec94a3fe6..776737d928ac0693180661f107f68f7ca1575da1 100644
--- a/lib/std/os/linux/vdso.zig
+++ b/lib/std/os/linux/vdso.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../../std.zig");
 const elf = std.elf;
 const linux = std.os.linux;
diff --git a/lib/std/os/linux/x86_64.zig b/lib/std/os/linux/x86_64.zig
index 33d2b66670e7ab12273a0efb36d55b76059c5cb5..8987e1aab3a11815da764aa574d85dc21dcff1fa 100644
--- a/lib/std/os/linux/x86_64.zig
+++ b/lib/std/os/linux/x86_64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("../bits.zig");
 
 pub fn syscall0(number: SYS) usize {
diff --git a/lib/std/os/netbsd.zig b/lib/std/os/netbsd.zig
index 5f9684b96de967ee7422a2d96322c156ed2dbdbf..a713a009ad7efb65951a1cbb2ae7dee62274e608 100644
--- a/lib/std/os/netbsd.zig
+++ b/lib/std/os/netbsd.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 pub usingnamespace std.c;
 pub usingnamespace @import("bits.zig");
diff --git a/lib/std/os/test.zig b/lib/std/os/test.zig
index dc8a89c688251e0575823e759bce345ab338d528..93c4ee04031dc1ac22b5f5edf30db8f060a9ddf6 100644
--- a/lib/std/os/test.zig
+++ b/lib/std/os/test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const os = std.os;
 const testing = std.testing;
diff --git a/lib/std/os/uefi.zig b/lib/std/os/uefi.zig
index c037075cd81d3ca69e3566a7a4a7ed1fdf5a0b1b..0127033db205e6a83971cee9d94b792ec4dc7d6e 100644
--- a/lib/std/os/uefi.zig
+++ b/lib/std/os/uefi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 /// A protocol is an interface identified by a GUID.
 pub const protocols = @import("uefi/protocols.zig");
 
diff --git a/lib/std/os/uefi/protocols.zig b/lib/std/os/uefi/protocols.zig
index 353c628a0582a5e1977a268c05def60ecb9a9c20..1519092b8481586d43d3773d442e157c8a07511b 100644
--- a/lib/std/os/uefi/protocols.zig
+++ b/lib/std/os/uefi/protocols.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const LoadedImageProtocol = @import("protocols/loaded_image_protocol.zig").LoadedImageProtocol;
 pub const loaded_image_device_path_protocol_guid = @import("protocols/loaded_image_protocol.zig").loaded_image_device_path_protocol_guid;
 
diff --git a/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig b/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig
index a06a19c1a411d3c6d553f48139a7f45b32fe7453..3ec6aab5b9bc59adf4eccef39012195c52cbde95 100644
--- a/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig
+++ b/lib/std/os/uefi/protocols/absolute_pointer_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/device_path_protocol.zig b/lib/std/os/uefi/protocols/device_path_protocol.zig
index f359484eb9c84da7625e5bced75cb15e755707c7..1a998f0f7874ffd99d77d2c7f97fdd5c88dfbeb3 100644
--- a/lib/std/os/uefi/protocols/device_path_protocol.zig
+++ b/lib/std/os/uefi/protocols/device_path_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/edid_active_protocol.zig b/lib/std/os/uefi/protocols/edid_active_protocol.zig
index fcdef78d83f7090b13d1c087b66f7d1c19d2bb1c..dc8057b4f8b59c1629e7fa5574ccf08591f97041 100644
--- a/lib/std/os/uefi/protocols/edid_active_protocol.zig
+++ b/lib/std/os/uefi/protocols/edid_active_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/edid_discovered_protocol.zig b/lib/std/os/uefi/protocols/edid_discovered_protocol.zig
index 00b59cb6c816ad7447ec566a7cc0d9c61d6339ce..1ed2b6277d2604f58d715c8de7e13b63950a2f59 100644
--- a/lib/std/os/uefi/protocols/edid_discovered_protocol.zig
+++ b/lib/std/os/uefi/protocols/edid_discovered_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/edid_override_protocol.zig b/lib/std/os/uefi/protocols/edid_override_protocol.zig
index efe73982e9d19eba5239222b2cca92d0bdf5939f..83260f7b881ff8f52aa86ceb3d2c45da0d26a66d 100644
--- a/lib/std/os/uefi/protocols/edid_override_protocol.zig
+++ b/lib/std/os/uefi/protocols/edid_override_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Handle = uefi.Handle;
diff --git a/lib/std/os/uefi/protocols/file_protocol.zig b/lib/std/os/uefi/protocols/file_protocol.zig
index eacd777008db9e75b52971f1df5045dedfef912d..ce34a2d6e5a5cb7166e33d9b3c4ea93770b72b6b 100644
--- a/lib/std/os/uefi/protocols/file_protocol.zig
+++ b/lib/std/os/uefi/protocols/file_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Time = uefi.Time;
diff --git a/lib/std/os/uefi/protocols/graphics_output_protocol.zig b/lib/std/os/uefi/protocols/graphics_output_protocol.zig
index 1ceccce0bfc4168b32f4d4acad59c6735f616653..3ec1c39ab81e3a50f2a37a9c535fca9720571b6b 100644
--- a/lib/std/os/uefi/protocols/graphics_output_protocol.zig
+++ b/lib/std/os/uefi/protocols/graphics_output_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/hii.zig b/lib/std/os/uefi/protocols/hii.zig
index 750e004c8bd132396a9c061bf04f8ca3d0bd6d01..960402828e7525bae4acb14fe40d41d528789966 100644
--- a/lib/std/os/uefi/protocols/hii.zig
+++ b/lib/std/os/uefi/protocols/hii.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/protocols/hii_database_protocol.zig b/lib/std/os/uefi/protocols/hii_database_protocol.zig
index e34f72c2f3b7ebdc81bae865d8ef11d43ee8a280..d0b16ff943faa300b1d3fb8ce5d51ce50c30d7c7 100644
--- a/lib/std/os/uefi/protocols/hii_database_protocol.zig
+++ b/lib/std/os/uefi/protocols/hii_database_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/hii_popup_protocol.zig b/lib/std/os/uefi/protocols/hii_popup_protocol.zig
index 2e4f621b41f90c48e534bb415fc76f5bf3dd89c2..1f5c5ce0f469811d4418038b02c85e9dfb54106d 100644
--- a/lib/std/os/uefi/protocols/hii_popup_protocol.zig
+++ b/lib/std/os/uefi/protocols/hii_popup_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/ip6_config_protocol.zig b/lib/std/os/uefi/protocols/ip6_config_protocol.zig
index 99ba76aa17e260ae0efe0d8f219466d8cca75cee..16002f62a6b5b2f98a1e610c409a88e2ab6a415d 100644
--- a/lib/std/os/uefi/protocols/ip6_config_protocol.zig
+++ b/lib/std/os/uefi/protocols/ip6_config_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/ip6_protocol.zig b/lib/std/os/uefi/protocols/ip6_protocol.zig
index b39ae60b2a98cb3455cc9394afa261af55214908..578a3cfb011df826721226bc2513313037c92cae 100644
--- a/lib/std/os/uefi/protocols/ip6_protocol.zig
+++ b/lib/std/os/uefi/protocols/ip6_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig b/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig
index 97ab1a431c2ee9d2cdb60d1707c19d5773c1e249..59605cc11b1de9c295ab30600ff747bb0f55943a 100644
--- a/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig
+++ b/lib/std/os/uefi/protocols/ip6_service_binding_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Handle = uefi.Handle;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/loaded_image_protocol.zig b/lib/std/os/uefi/protocols/loaded_image_protocol.zig
index b8afcb1063a159f4d69c26371c9f203039661e42..96aa10f08d695f2e5644343da3b25ca4b6b33704 100644
--- a/lib/std/os/uefi/protocols/loaded_image_protocol.zig
+++ b/lib/std/os/uefi/protocols/loaded_image_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Handle = uefi.Handle;
diff --git a/lib/std/os/uefi/protocols/managed_network_protocol.zig b/lib/std/os/uefi/protocols/managed_network_protocol.zig
index 34ef6c40fa381b3846bfd30742c6f177bc28e418..9202c6f139a45d16949f378b67e2de1fb6ad24e0 100644
--- a/lib/std/os/uefi/protocols/managed_network_protocol.zig
+++ b/lib/std/os/uefi/protocols/managed_network_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig b/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig
index e9657e445640664043523f98e1fd6de1449fc7d7..0c684336c83f2c89d19a1d81992b47cbdf932e9f 100644
--- a/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig
+++ b/lib/std/os/uefi/protocols/managed_network_service_binding_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Handle = uefi.Handle;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/rng_protocol.zig b/lib/std/os/uefi/protocols/rng_protocol.zig
index a32b202f4428757128b7cc3c63cc1a235f24e425..713b76b371c15a3b5c3abd0918e7c4a1d1b526a4 100644
--- a/lib/std/os/uefi/protocols/rng_protocol.zig
+++ b/lib/std/os/uefi/protocols/rng_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/shell_parameters_protocol.zig b/lib/std/os/uefi/protocols/shell_parameters_protocol.zig
index afbd26e9390a17ed4de3e0c6373d3aca1c55ccd0..7ec46b732c454d4a3e6c739ebd1a6b605f1a3ac7 100644
--- a/lib/std/os/uefi/protocols/shell_parameters_protocol.zig
+++ b/lib/std/os/uefi/protocols/shell_parameters_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const FileHandle = uefi.FileHandle;
diff --git a/lib/std/os/uefi/protocols/simple_file_system_protocol.zig b/lib/std/os/uefi/protocols/simple_file_system_protocol.zig
index 119c1e658723dc116ed599c586aa5378c56931c8..946c88a89b0b59798c53c5fb6cb9249ba0dcd168 100644
--- a/lib/std/os/uefi/protocols/simple_file_system_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_file_system_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const FileProtocol = uefi.protocols.FileProtocol;
diff --git a/lib/std/os/uefi/protocols/simple_network_protocol.zig b/lib/std/os/uefi/protocols/simple_network_protocol.zig
index ac7446036ee78cbfd5b54408a7c248ac4d76f4f7..f74f11a857c92d8287ffaeeeeeee552a4e438d52 100644
--- a/lib/std/os/uefi/protocols/simple_network_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_network_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_pointer_protocol.zig b/lib/std/os/uefi/protocols/simple_pointer_protocol.zig
index d217ab593027dfebb2da4c6673779281bf9d9173..5f8ca7569e30f7afa0806059615f156f1842d762 100644
--- a/lib/std/os/uefi/protocols/simple_pointer_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_pointer_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig b/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig
index 4a2b098e61a98efa19498d0de1bac46d6791e063..096013bfb01491974d71911398abebc8076e3943 100644
--- a/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_text_input_ex_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_text_input_protocol.zig b/lib/std/os/uefi/protocols/simple_text_input_protocol.zig
index 58ed071331fc130a676738b5fc7aa6c57f6253af..d093186532ef22e48f8c023cff7d475be7539fea 100644
--- a/lib/std/os/uefi/protocols/simple_text_input_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_text_input_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/protocols/simple_text_output_protocol.zig b/lib/std/os/uefi/protocols/simple_text_output_protocol.zig
index 84f540cb786ac7ace519b406473ca96987bf981e..f9bbc3714061b184702b28b9b4e1653ca1aeabcd 100644
--- a/lib/std/os/uefi/protocols/simple_text_output_protocol.zig
+++ b/lib/std/os/uefi/protocols/simple_text_output_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Status = uefi.Status;
diff --git a/lib/std/os/uefi/protocols/udp6_protocol.zig b/lib/std/os/uefi/protocols/udp6_protocol.zig
index 46c76beaa60e5ba170f94bb867656b3e6354e3d9..50b7dae7c4a7f76021a9b55a1442752edfa8005f 100644
--- a/lib/std/os/uefi/protocols/udp6_protocol.zig
+++ b/lib/std/os/uefi/protocols/udp6_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const Event = uefi.Event;
diff --git a/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig b/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig
index 811692adc36dbdba5c017f56734fa73d927e6231..4f4e0a26384f3c6229179c578bc9129129e39605 100644
--- a/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig
+++ b/lib/std/os/uefi/protocols/udp6_service_binding_protocol.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Handle = uefi.Handle;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/status.zig b/lib/std/os/uefi/status.zig
index 0da4508e8f1e37e3967245fd2148a0375bcb94f2..3e8696220213e342d0d00aac5bddf2ddf7e7f994 100644
--- a/lib/std/os/uefi/status.zig
+++ b/lib/std/os/uefi/status.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const high_bit = 1 << @typeInfo(usize).Int.bits - 1;
 
 pub const Status = extern enum(usize) {
diff --git a/lib/std/os/uefi/tables.zig b/lib/std/os/uefi/tables.zig
index 0011c80a9cd20b6976c1a33a5591095cfd0bc0f0..b796eb6e0629e278ceebf56417ce81dee43e79cd 100644
--- a/lib/std/os/uefi/tables.zig
+++ b/lib/std/os/uefi/tables.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const AllocateType = @import("tables/boot_services.zig").AllocateType;
 pub const BootServices = @import("tables/boot_services.zig").BootServices;
 pub const ConfigurationTable = @import("tables/configuration_table.zig").ConfigurationTable;
diff --git a/lib/std/os/uefi/tables/boot_services.zig b/lib/std/os/uefi/tables/boot_services.zig
index a1d2c1ca59016892eac828c6db0870ad590b54a9..09431cf3f4345e53d81d37668254928713225d4b 100644
--- a/lib/std/os/uefi/tables/boot_services.zig
+++ b/lib/std/os/uefi/tables/boot_services.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Event = uefi.Event;
 const Guid = uefi.Guid;
diff --git a/lib/std/os/uefi/tables/configuration_table.zig b/lib/std/os/uefi/tables/configuration_table.zig
index 0ac3bd73c8544c1630726448f0fcfe924f0d3a19..c7dedad5fb659c846c4e31388ee2f8152e72330b 100644
--- a/lib/std/os/uefi/tables/configuration_table.zig
+++ b/lib/std/os/uefi/tables/configuration_table.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 
diff --git a/lib/std/os/uefi/tables/runtime_services.zig b/lib/std/os/uefi/tables/runtime_services.zig
index 981e07275bea2f5eac04039d7b6c5b6199bab0ee..a2012168eed520b12302cfa57c6e5a96d8dfb78e 100644
--- a/lib/std/os/uefi/tables/runtime_services.zig
+++ b/lib/std/os/uefi/tables/runtime_services.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const Guid = uefi.Guid;
 const TableHeader = uefi.tables.TableHeader;
diff --git a/lib/std/os/uefi/tables/system_table.zig b/lib/std/os/uefi/tables/system_table.zig
index 40fec34d4421997eafbdfa9bfa3674140059ff11..cbe66fbb680aa60b55b2ba4a63793e4f5c19c2e7 100644
--- a/lib/std/os/uefi/tables/system_table.zig
+++ b/lib/std/os/uefi/tables/system_table.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const uefi = @import("std").os.uefi;
 const BootServices = uefi.tables.BootServices;
 const ConfigurationTable = uefi.tables.ConfigurationTable;
diff --git a/lib/std/os/uefi/tables/table_header.zig b/lib/std/os/uefi/tables/table_header.zig
index d5d40942327ca9f9217d6b0270ddace16f627b1d..a8343c967a2be1fe134a56d967fc3933f60a8795 100644
--- a/lib/std/os/uefi/tables/table_header.zig
+++ b/lib/std/os/uefi/tables/table_header.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const TableHeader = extern struct {
     signature: u64,
     revision: u32,
diff --git a/lib/std/os/wasi.zig b/lib/std/os/wasi.zig
index 23df66f385b464619ffc9efc097144dfd3dfa41d..899541f3feef5b2d7d1aa84b63cc35b4df3a4534 100644
--- a/lib/std/os/wasi.zig
+++ b/lib/std/os/wasi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // wasi_snapshot_preview1 spec available (in witx format) here:
 // * typenames -- https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/typenames.witx
 // * module -- https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/wasi_snapshot_preview1.witx
diff --git a/lib/std/os/windows.zig b/lib/std/os/windows.zig
index 2f2369a458616121ca60bd723b6ce9d618b6c5a9..a23eead14ffb747e88aaa164c6e19f14bd9dffbf 100644
--- a/lib/std/os/windows.zig
+++ b/lib/std/os/windows.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // This file contains thin wrappers around Windows-specific APIs, with these
 // specific goals in mind:
 // * Convert "errno"-style error codes into Zig errors.
diff --git a/lib/std/os/windows/advapi32.zig b/lib/std/os/windows/advapi32.zig
index 6364c5bddbedaa294f3af1c11518a2ea0df8a994..b6dbaf9a7a7bb4c6a7658941f9600d7221d64333 100644
--- a/lib/std/os/windows/advapi32.zig
+++ b/lib/std/os/windows/advapi32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "advapi32" fn RegOpenKeyExW(
diff --git a/lib/std/os/windows/bits.zig b/lib/std/os/windows/bits.zig
index 44bc1ba4371a0d4158940c57236278107410cbc7..d22f42d6e86ba098a5492c07eaf420a94a2a9497 100644
--- a/lib/std/os/windows/bits.zig
+++ b/lib/std/os/windows/bits.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Platform-dependent types and values that are used along with OS-specific APIs.
 
 const builtin = @import("builtin");
diff --git a/lib/std/os/windows/gdi32.zig b/lib/std/os/windows/gdi32.zig
index 676065b57447a3914aecaf5e57a1afc1b3f037e1..f36732ba1e371924950f3612f1d657d2f2d02816 100644
--- a/lib/std/os/windows/gdi32.zig
+++ b/lib/std/os/windows/gdi32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub const PIXELFORMATDESCRIPTOR = extern struct {
diff --git a/lib/std/os/windows/kernel32.zig b/lib/std/os/windows/kernel32.zig
index b50143b0754d13401639b688dcdabb99b46cd1c0..fce9eea908ad29690c0abb0aab32b747a63c0895 100644
--- a/lib/std/os/windows/kernel32.zig
+++ b/lib/std/os/windows/kernel32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "kernel32" fn AddVectoredExceptionHandler(First: c_ulong, Handler: ?VECTORED_EXCEPTION_HANDLER) callconv(.Stdcall) ?*c_void;
diff --git a/lib/std/os/windows/lang.zig b/lib/std/os/windows/lang.zig
index b173a62a73dc846a2e174031ed54d55da217a5bf..61efa3bdb3c20dce089dfb23a4c36ad8ce35d012 100644
--- a/lib/std/os/windows/lang.zig
+++ b/lib/std/os/windows/lang.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const NEUTRAL = 0x00;
 pub const INVARIANT = 0x7f;
 pub const AFRIKAANS = 0x36;
diff --git a/lib/std/os/windows/ntdll.zig b/lib/std/os/windows/ntdll.zig
index 5edad85c2003295795e9cf122f948841b4838298..c11098b6bce7314ebebb0ac83901972e7e8cfd39 100644
--- a/lib/std/os/windows/ntdll.zig
+++ b/lib/std/os/windows/ntdll.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "NtDll" fn RtlGetVersion(
diff --git a/lib/std/os/windows/ntstatus.zig b/lib/std/os/windows/ntstatus.zig
index 5c9344d639384cd482d4cc7537208b18f3341a48..0e567df510318198ed95e61c707b02f918ca44b2 100644
--- a/lib/std/os/windows/ntstatus.zig
+++ b/lib/std/os/windows/ntstatus.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // NTSTATUS codes from https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-erref/596a1078-e883-4972-9bbc-49e60bebca55?
 pub const NTSTATUS = extern enum(u32) {
     /// The operation completed successfully.
diff --git a/lib/std/os/windows/ole32.zig b/lib/std/os/windows/ole32.zig
index a472089078421e7a15405818130a695a9a5c098b..f46ee330474f568f98661e1a21f261bc1efdf538 100644
--- a/lib/std/os/windows/ole32.zig
+++ b/lib/std/os/windows/ole32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "ole32" fn CoTaskMemFree(pv: LPVOID) callconv(.Stdcall) void;
diff --git a/lib/std/os/windows/psapi.zig b/lib/std/os/windows/psapi.zig
index 1a5a7d4bf2a1379de0baea9e50038c0d9bc6165f..db6fc93314f50f71d13006b769242da141a85153 100644
--- a/lib/std/os/windows/psapi.zig
+++ b/lib/std/os/windows/psapi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "psapi" fn EmptyWorkingSet(hProcess: HANDLE) callconv(.Stdcall) BOOL;
diff --git a/lib/std/os/windows/shell32.zig b/lib/std/os/windows/shell32.zig
index 762589c6de1c4f4b53fa1cab4af5a88b56a414cf..ce9d54f6dfb6dbc69db0286f89c59cfbb1980a18 100644
--- a/lib/std/os/windows/shell32.zig
+++ b/lib/std/os/windows/shell32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub extern "shell32" fn SHGetKnownFolderPath(rfid: *const KNOWNFOLDERID, dwFlags: DWORD, hToken: ?HANDLE, ppszPath: *[*:0]WCHAR) callconv(.Stdcall) HRESULT;
diff --git a/lib/std/os/windows/sublang.zig b/lib/std/os/windows/sublang.zig
index e9929c6d79c22fdd1e1f68a041bc1a0a3b23c2e3..5249e8ed0a875c9534681a463942bfa7519b13d7 100644
--- a/lib/std/os/windows/sublang.zig
+++ b/lib/std/os/windows/sublang.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const NEUTRAL = 0x00;
 pub const DEFAULT = 0x01;
 pub const SYS_DEFAULT = 0x02;
diff --git a/lib/std/os/windows/user32.zig b/lib/std/os/windows/user32.zig
index 3877e19ad8dd14e7139fdb69fb94ce8b7e7b80fd..6a80a92cad25d11beedf0fe0b38e974428b19d05 100644
--- a/lib/std/os/windows/user32.zig
+++ b/lib/std/os/windows/user32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 // PM
diff --git a/lib/std/os/windows/win32error.zig b/lib/std/os/windows/win32error.zig
index 037797e25f73cf426e52a78b404c4942f46f9383..2e1f111d92c10a8a981b50dd32a3937554fa0fe9 100644
--- a/lib/std/os/windows/win32error.zig
+++ b/lib/std/os/windows/win32error.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Codes are from https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-erref/18d8fbe8-a967-4f1c-ae50-99ca8e491d2d
 pub const Win32Error = extern enum(u16) {
     /// The operation completed successfully.
diff --git a/lib/std/os/windows/ws2_32.zig b/lib/std/os/windows/ws2_32.zig
index 1e36a72038d1afd77b5d059b0d9ad832ce59bf4f..cfc212d15aaf40fc4a9c1307393d6c8f0628947d 100644
--- a/lib/std/os/windows/ws2_32.zig
+++ b/lib/std/os/windows/ws2_32.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 usingnamespace @import("bits.zig");
 
 pub const SOCKET = *@Type(.Opaque);
diff --git a/lib/std/packed_int_array.zig b/lib/std/packed_int_array.zig
index 07a79655adb133a410836b290ece6ebdc30ff100..de99afa3036d1601feb2e3bfd2a872fe8d5e6d3c 100644
--- a/lib/std/packed_int_array.zig
+++ b/lib/std/packed_int_array.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const debug = std.debug;
diff --git a/lib/std/pdb.zig b/lib/std/pdb.zig
index a702a8aed6e7821898a64cf1e8ea1cf2e713a975..e8c61f859db0a26bc1e215cc3a1f714b6fecff56 100644
--- a/lib/std/pdb.zig
+++ b/lib/std/pdb.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std.zig");
 const io = std.io;
diff --git a/lib/std/priority_queue.zig b/lib/std/priority_queue.zig
index 69b9e06a5be906461b808bca900219734039e65e..1c0d230d4d23c465ee6432e1b930375408c6e09c 100644
--- a/lib/std/priority_queue.zig
+++ b/lib/std/priority_queue.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const Allocator = std.mem.Allocator;
 const assert = std.debug.assert;
diff --git a/lib/std/process.zig b/lib/std/process.zig
index 1a0dfad474f037b7ee33b8075ab37fec403f4069..69befa2fc809918d6c8eab9a82290da839df1ff4 100644
--- a/lib/std/process.zig
+++ b/lib/std/process.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const os = std.os;
diff --git a/lib/std/progress.zig b/lib/std/progress.zig
index b81e81aa2c7a5b4b0adbc35fc6c01966c91781dc..654d8cc228db35a49466063db7d94462ab81e2fa 100644
--- a/lib/std/progress.zig
+++ b/lib/std/progress.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const windows = std.os.windows;
 const testing = std.testing;
diff --git a/lib/std/rand.zig b/lib/std/rand.zig
index 1e5bb37592000c24206f410d8f86237c23600e71..85f11ff44992131bad4ec11ec1fbc2e8c3333256 100644
--- a/lib/std/rand.zig
+++ b/lib/std/rand.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // The engines provided here should be initialized from an external source. For now, randomBytes
 // from the crypto package is the most suitable. Be sure to use a CSPRNG when required, otherwise using
 // a normal PRNG will be faster and use substantially less stack space.
diff --git a/lib/std/rand/ziggurat.zig b/lib/std/rand/ziggurat.zig
index 06728f170cff8b24b2b853be23500dc77c46e7c0..da189637bf57310e794b4f5b430ee98fdb80c422 100644
--- a/lib/std/rand/ziggurat.zig
+++ b/lib/std/rand/ziggurat.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Implements ZIGNOR [1].
 //
 // [1]: Jurgen A. Doornik (2005). [*An Improved Ziggurat Method to Generate Normal Random Samples*]
diff --git a/lib/std/rb.zig b/lib/std/rb.zig
index a39b815e749144f446a1d8a4e6325d2324c6652a..8cf90a1eea5cdd76c3d6e89552bd67f31faafef9 100644
--- a/lib/std/rb.zig
+++ b/lib/std/rb.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/reset_event.zig b/lib/std/reset_event.zig
index 6f520773d84ba4944d22e202d087db0356d467dd..31e6c28cf89ea7e580bd42d803954b87c43db704 100644
--- a/lib/std/reset_event.zig
+++ b/lib/std/reset_event.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 const testing = std.testing;
diff --git a/lib/std/segmented_list.zig b/lib/std/segmented_list.zig
index d39fe3e2397b087d6c24e75861aee92c3c8f8213..a63196c443c598b57c097059f66355e69a876903 100644
--- a/lib/std/segmented_list.zig
+++ b/lib/std/segmented_list.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/sort.zig b/lib/std/sort.zig
index 464054e4a50c7c91b48bd25d9d393ae258102f37..e2e4cc662dc5794b407ce3955cc3b6c22e62d51b 100644
--- a/lib/std/sort.zig
+++ b/lib/std/sort.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/special/build_runner.zig b/lib/std/special/build_runner.zig
index 83c181e8413414b8cc14d5f4761e9daa31a4e7da..46d3b0b6153c9cffa554031b9786d9ef7fa85ba2 100644
--- a/lib/std/special/build_runner.zig
+++ b/lib/std/special/build_runner.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const root = @import("@build");
 const std = @import("std");
 const builtin = @import("builtin");
diff --git a/lib/std/special/c.zig b/lib/std/special/c.zig
index 170bb9862030fae876f10c0b644498d5d1ed0f0b..f18fe11e668a0e2623f0f1827ca52f8287062379 100644
--- a/lib/std/special/c.zig
+++ b/lib/std/special/c.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // This is Zig's multi-target implementation of libc.
 // When builtin.link_libc is true, we need to export all the functions and
 // provide an entire C API.
diff --git a/lib/std/special/compiler_rt.zig b/lib/std/special/compiler_rt.zig
index 2716de811369c2f0400b596f73274d490442d93a..42db6b96bffc7675776f77a7a15e7e3625391593 100644
--- a/lib/std/special/compiler_rt.zig
+++ b/lib/std/special/compiler_rt.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const is_test = builtin.is_test;
diff --git a/lib/std/special/compiler_rt/addXf3.zig b/lib/std/special/compiler_rt/addXf3.zig
index 849efa1cd2108758844c568bf2c6e7940dae3775..6dd0faaebbc2703656ada89736a58ef969096a94 100644
--- a/lib/std/special/compiler_rt/addXf3.zig
+++ b/lib/std/special/compiler_rt/addXf3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/02d85149a05cb1f6dc49f0ba7a2ceca53718ae17/compiler-rt/lib/builtins/fp_add_impl.inc
diff --git a/lib/std/special/compiler_rt/addXf3_test.zig b/lib/std/special/compiler_rt/addXf3_test.zig
index af991b37e923cfbc4b363dc0654ed4e6297ba756..3d7530950766d99c0ddf9acebf752e88f6d52cb0 100644
--- a/lib/std/special/compiler_rt/addXf3_test.zig
+++ b/lib/std/special/compiler_rt/addXf3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/02d85149a05cb1f6dc49f0ba7a2ceca53718ae17/compiler-rt/test/builtins/Unit/addtf3_test.c
diff --git a/lib/std/special/compiler_rt/arm.zig b/lib/std/special/compiler_rt/arm.zig
index 5e718ed4c4a0eede93c2064a8a31e51349eba78a..1eecd3ceac1ebcda632eaf19b460abae2c828061 100644
--- a/lib/std/special/compiler_rt/arm.zig
+++ b/lib/std/special/compiler_rt/arm.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // ARM specific builtins
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/ashldi3_test.zig b/lib/std/special/compiler_rt/ashldi3_test.zig
index 547c315b249bb175bb5f1fba51b8233321d85351..874681a79a4f8f9ddbc9915d53ee5c175825a0a3 100644
--- a/lib/std/special/compiler_rt/ashldi3_test.zig
+++ b/lib/std/special/compiler_rt/ashldi3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __ashldi3 = @import("shift.zig").__ashldi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/ashlti3_test.zig b/lib/std/special/compiler_rt/ashlti3_test.zig
index a4510f52d7b1f3c5cc5c781cb275ebdcc96bfc0c..42cb3a47bb5fff8d065b55ea3403117079778691 100644
--- a/lib/std/special/compiler_rt/ashlti3_test.zig
+++ b/lib/std/special/compiler_rt/ashlti3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __ashlti3 = @import("shift.zig").__ashlti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/ashrdi3_test.zig b/lib/std/special/compiler_rt/ashrdi3_test.zig
index 3ba30edbfe073fad0f14b563bf23bf88b1e34ac3..e80b95af9efebf61c163d16e6300cde626aa636a 100644
--- a/lib/std/special/compiler_rt/ashrdi3_test.zig
+++ b/lib/std/special/compiler_rt/ashrdi3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __ashrdi3 = @import("shift.zig").__ashrdi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/ashrti3_test.zig b/lib/std/special/compiler_rt/ashrti3_test.zig
index 43d5d119105263a74530d6d39026f9129846e7b2..958b8a8a74c1b77db1585c97cb9494a73817e934 100644
--- a/lib/std/special/compiler_rt/ashrti3_test.zig
+++ b/lib/std/special/compiler_rt/ashrti3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __ashrti3 = @import("shift.zig").__ashrti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/atomics.zig b/lib/std/special/compiler_rt/atomics.zig
index e2cb45bef32a7ff70135c9bde427684fc52b2b5a..a76695ff2c32a64c6670c6966677e3cb1ad3316f 100644
--- a/lib/std/special/compiler_rt/atomics.zig
+++ b/lib/std/special/compiler_rt/atomics.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 
diff --git a/lib/std/special/compiler_rt/aulldiv.zig b/lib/std/special/compiler_rt/aulldiv.zig
index 2e2dd364d5381d73d2375d8169e8e02bcd708690..cf9b26c5a6ea609a3738defb8051aa5c0da7f785 100644
--- a/lib/std/special/compiler_rt/aulldiv.zig
+++ b/lib/std/special/compiler_rt/aulldiv.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 pub fn _alldiv(a: i64, b: i64) callconv(.Stdcall) i64 {
diff --git a/lib/std/special/compiler_rt/aullrem.zig b/lib/std/special/compiler_rt/aullrem.zig
index 4244f1bb8043c4502bf5cde5eb73a8f23b1026b2..7c981cc08864b4951d40fd626f6e1a4a481cd32d 100644
--- a/lib/std/special/compiler_rt/aullrem.zig
+++ b/lib/std/special/compiler_rt/aullrem.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 pub fn _allrem(a: i64, b: i64) callconv(.Stdcall) i64 {
diff --git a/lib/std/special/compiler_rt/clear_cache.zig b/lib/std/special/compiler_rt/clear_cache.zig
index 6306d5b57522ee51be53e4c144164218f4dac22e..d862f739d3a332b334fa031d47b0bf01a150b587 100644
--- a/lib/std/special/compiler_rt/clear_cache.zig
+++ b/lib/std/special/compiler_rt/clear_cache.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const arch = std.builtin.cpu.arch;
 const os = std.builtin.os.tag;
diff --git a/lib/std/special/compiler_rt/clzsi2.zig b/lib/std/special/compiler_rt/clzsi2.zig
index 0c9c5d431828679e9573f9d08eeb536d36e0108d..ac314ff9e0f7dd83627c8d2170513fff0df4f26b 100644
--- a/lib/std/special/compiler_rt/clzsi2.zig
+++ b/lib/std/special/compiler_rt/clzsi2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 fn __clzsi2_generic(a: i32) callconv(.C) i32 {
diff --git a/lib/std/special/compiler_rt/clzsi2_test.zig b/lib/std/special/compiler_rt/clzsi2_test.zig
index 8a2896fcb6cac6e8dd0bd56f67104bea914b82b6..2d9ba3d1b3e3fd9336cf60be8499c5075f117c27 100644
--- a/lib/std/special/compiler_rt/clzsi2_test.zig
+++ b/lib/std/special/compiler_rt/clzsi2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const clzsi2 = @import("clzsi2.zig");
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/compareXf2.zig b/lib/std/special/compiler_rt/compareXf2.zig
index 6489d283ff52558b764f907de6f3bf086698d085..f50dc67474694ea04f2a749351198ea9b9d507c4 100644
--- a/lib/std/special/compiler_rt/compareXf2.zig
+++ b/lib/std/special/compiler_rt/compareXf2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/lib/builtins/comparesf2.c
diff --git a/lib/std/special/compiler_rt/comparedf2_test.zig b/lib/std/special/compiler_rt/comparedf2_test.zig
index 16a2a258ce15eb249b7b7e5452f046e18a71a79f..9d681b8f8176ac968a0a0c136f5598ff820dc1bc 100644
--- a/lib/std/special/compiler_rt/comparedf2_test.zig
+++ b/lib/std/special/compiler_rt/comparedf2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/comparedf2_test.c
diff --git a/lib/std/special/compiler_rt/comparesf2_test.zig b/lib/std/special/compiler_rt/comparesf2_test.zig
index e3966c021b9c794fef6586c08b8c4bea6215426b..da7fe940a02b4d1f5c636e1a287360ac92754e7e 100644
--- a/lib/std/special/compiler_rt/comparesf2_test.zig
+++ b/lib/std/special/compiler_rt/comparesf2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/comparesf2_test.c
diff --git a/lib/std/special/compiler_rt/divdf3.zig b/lib/std/special/compiler_rt/divdf3.zig
index 8b7525e931673d50f80cf0eb6ef1cae0f9c13b43..ad72f96057faee18a295687e6a7396c3c63981f1 100644
--- a/lib/std/special/compiler_rt/divdf3.zig
+++ b/lib/std/special/compiler_rt/divdf3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/lib/builtins/divdf3.c
diff --git a/lib/std/special/compiler_rt/divdf3_test.zig b/lib/std/special/compiler_rt/divdf3_test.zig
index 61d6731ea7758115f2275d4912ea757e471e1522..04cac956d21c9c93348127eef7ebbe1f6d9984b0 100644
--- a/lib/std/special/compiler_rt/divdf3_test.zig
+++ b/lib/std/special/compiler_rt/divdf3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/divdf3_test.c
diff --git a/lib/std/special/compiler_rt/divsf3.zig b/lib/std/special/compiler_rt/divsf3.zig
index 62a6c56262c9f0b8dfed28e7203faff6bffade22..80af806eb1b58b2705c41ebc06cd41f36bb8be61 100644
--- a/lib/std/special/compiler_rt/divsf3.zig
+++ b/lib/std/special/compiler_rt/divsf3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/lib/builtins/divsf3.c
diff --git a/lib/std/special/compiler_rt/divsf3_test.zig b/lib/std/special/compiler_rt/divsf3_test.zig
index 188842af5887789e8e54da62cb135b24ca9cbe2d..30dcba462bcae69a096738441b912bfe4828b043 100644
--- a/lib/std/special/compiler_rt/divsf3_test.zig
+++ b/lib/std/special/compiler_rt/divsf3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/commit/d674d96bc56c0f377879d01c9d8dfdaaa7859cdb/compiler-rt/test/builtins/Unit/divsf3_test.c
diff --git a/lib/std/special/compiler_rt/divtf3.zig b/lib/std/special/compiler_rt/divtf3.zig
index d177454ad24def525e361a6168a464ecaf49111e..f6f7c1bf7d833ebec25ab364c3877b6707e72a04 100644
--- a/lib/std/special/compiler_rt/divtf3.zig
+++ b/lib/std/special/compiler_rt/divtf3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/divtf3_test.zig b/lib/std/special/compiler_rt/divtf3_test.zig
index 4940b2c403d7099f66d9f9138a13b1faae13669f..cf6f2f2eaff3ef5a64f23c8b83308309f8279c05 100644
--- a/lib/std/special/compiler_rt/divtf3_test.zig
+++ b/lib/std/special/compiler_rt/divtf3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const math = std.math;
 const testing = std.testing;
diff --git a/lib/std/special/compiler_rt/divti3.zig b/lib/std/special/compiler_rt/divti3.zig
index afb30950b86a579a4e9edc6ceb4b13d99f102e03..4b7d4599917147cd4960eabfc78e21f19f79a526 100644
--- a/lib/std/special/compiler_rt/divti3.zig
+++ b/lib/std/special/compiler_rt/divti3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const udivmod = @import("udivmod.zig").udivmod;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/divti3_test.zig b/lib/std/special/compiler_rt/divti3_test.zig
index 8601cfae030c2f3e47aac8cd076cbbf14c23d5f0..18fab24ed1e7b0e85f632adc33f94adf8c553d63 100644
--- a/lib/std/special/compiler_rt/divti3_test.zig
+++ b/lib/std/special/compiler_rt/divti3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __divti3 = @import("divti3.zig").__divti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/extendXfYf2.zig b/lib/std/special/compiler_rt/extendXfYf2.zig
index 6aca0ac98ff62a3d96f5a9e0b1ab323da9c46fac..e0536c04ad618a2293085d367fd0f97465efb213 100644
--- a/lib/std/special/compiler_rt/extendXfYf2.zig
+++ b/lib/std/special/compiler_rt/extendXfYf2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
diff --git a/lib/std/special/compiler_rt/extendXfYf2_test.zig b/lib/std/special/compiler_rt/extendXfYf2_test.zig
index e2664f6bae12de67100d023598080764ec27dc5c..d82a8baf4cec7294e44a7bc9e6e1d5e557d76a6e 100644
--- a/lib/std/special/compiler_rt/extendXfYf2_test.zig
+++ b/lib/std/special/compiler_rt/extendXfYf2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const __extenddftf2 = @import("extendXfYf2.zig").__extenddftf2;
 const __extendhfsf2 = @import("extendXfYf2.zig").__extendhfsf2;
diff --git a/lib/std/special/compiler_rt/fixdfdi.zig b/lib/std/special/compiler_rt/fixdfdi.zig
index 11b50091294ed250563d21e1856efc02a8eee8b3..28de1ecd2314f362408e0f83b71bc05e1be3b75d 100644
--- a/lib/std/special/compiler_rt/fixdfdi.zig
+++ b/lib/std/special/compiler_rt/fixdfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixdfdi_test.zig b/lib/std/special/compiler_rt/fixdfdi_test.zig
index 92dbdc2a5e1a2bc694cd7c2d8f994f1e5f7792c3..83835106cd61a256fe7f9c34fcd8c4df75d31943 100644
--- a/lib/std/special/compiler_rt/fixdfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixdfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixdfdi = @import("fixdfdi.zig").__fixdfdi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixdfsi.zig b/lib/std/special/compiler_rt/fixdfsi.zig
index 8a6d8da34203bdd102de75614a46610d2ed5efc6..678c75d0c1b2dfdec646d2cd93dc59834e3f1483 100644
--- a/lib/std/special/compiler_rt/fixdfsi.zig
+++ b/lib/std/special/compiler_rt/fixdfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixdfsi_test.zig b/lib/std/special/compiler_rt/fixdfsi_test.zig
index fb9051889292fa7c1cb921220f744f2954ed2e67..8050a1b9c5b15620b3160775d07e3054635232d9 100644
--- a/lib/std/special/compiler_rt/fixdfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixdfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixdfsi = @import("fixdfsi.zig").__fixdfsi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixdfti.zig b/lib/std/special/compiler_rt/fixdfti.zig
index 0e21f0ba192147cee20614c3c63657ed90dd8baa..3d9266ae1ff830eba743c4f0c0aad07ef6d90060 100644
--- a/lib/std/special/compiler_rt/fixdfti.zig
+++ b/lib/std/special/compiler_rt/fixdfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixdfti_test.zig b/lib/std/special/compiler_rt/fixdfti_test.zig
index f66e4a3d88821414e85a442a92775cd42aacc1be..796855b71645d13a4de4717ed20de05a827dfe1a 100644
--- a/lib/std/special/compiler_rt/fixdfti_test.zig
+++ b/lib/std/special/compiler_rt/fixdfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixdfti = @import("fixdfti.zig").__fixdfti;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixint.zig b/lib/std/special/compiler_rt/fixint.zig
index daf7a1bdc761545e5415e7a53a2f9ec941f83168..0bf0c8be1ef9e9c2bf24908e3f50ae3a5ece79c7 100644
--- a/lib/std/special/compiler_rt/fixint.zig
+++ b/lib/std/special/compiler_rt/fixint.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const is_test = @import("builtin").is_test;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixint_test.zig b/lib/std/special/compiler_rt/fixint_test.zig
index 4efb1e6ab3a44809e5700074687132309dedb500..49942e5382927f6840d71cd6d6a591065d3ff17c 100644
--- a/lib/std/special/compiler_rt/fixint_test.zig
+++ b/lib/std/special/compiler_rt/fixint_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const is_test = @import("builtin").is_test;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixsfdi.zig b/lib/std/special/compiler_rt/fixsfdi.zig
index d0d958cdd6b310c295307c0644ae56981b79c4aa..cc5731946dc90a766b2f9022c5131ed5d76585fe 100644
--- a/lib/std/special/compiler_rt/fixsfdi.zig
+++ b/lib/std/special/compiler_rt/fixsfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixsfdi_test.zig b/lib/std/special/compiler_rt/fixsfdi_test.zig
index 5888c9804d9826565fbf306da9331860b6db6911..d93c3d4218d5d2ebf55acf561b2ccf86d338581f 100644
--- a/lib/std/special/compiler_rt/fixsfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixsfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixsfdi = @import("fixsfdi.zig").__fixsfdi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixsfsi.zig b/lib/std/special/compiler_rt/fixsfsi.zig
index 84395d0fa67a8689a3e12f1ed1602d16774eb115..62334574b0d0422fc032e4d38eb3ce3dce5be4c6 100644
--- a/lib/std/special/compiler_rt/fixsfsi.zig
+++ b/lib/std/special/compiler_rt/fixsfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixsfsi_test.zig b/lib/std/special/compiler_rt/fixsfsi_test.zig
index 844235bc9db9290af56fc508bab756671cdfa594..56c28d91ab9c1a4a4ced80ef030a91b820186fbc 100644
--- a/lib/std/special/compiler_rt/fixsfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixsfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixsfsi = @import("fixsfsi.zig").__fixsfsi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixsfti.zig b/lib/std/special/compiler_rt/fixsfti.zig
index d7ce4b3a602d6ffe9184e418270404fb3d63ab12..31dea953e81cacaa2391b719b81a4709a449a840 100644
--- a/lib/std/special/compiler_rt/fixsfti.zig
+++ b/lib/std/special/compiler_rt/fixsfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixsfti_test.zig b/lib/std/special/compiler_rt/fixsfti_test.zig
index 9eb2883f38c68480ee9a163edf38f2986eb398bb..d0bdcc4e757b14a791174dceb95bc45db39dd31e 100644
--- a/lib/std/special/compiler_rt/fixsfti_test.zig
+++ b/lib/std/special/compiler_rt/fixsfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixsfti = @import("fixsfti.zig").__fixsfti;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixtfdi.zig b/lib/std/special/compiler_rt/fixtfdi.zig
index 0ef3aa225937ad6b4af07c725efdce8a1cbba70b..edf70dbe4939954d6dd1f566a9370bc8d6326e28 100644
--- a/lib/std/special/compiler_rt/fixtfdi.zig
+++ b/lib/std/special/compiler_rt/fixtfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixtfdi_test.zig b/lib/std/special/compiler_rt/fixtfdi_test.zig
index 6baa9011c3ea49ca0f854dd78c9cf7976a744f00..b926f33d50a38aaceafad928bb1000d381b7c7dd 100644
--- a/lib/std/special/compiler_rt/fixtfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixtfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixtfdi = @import("fixtfdi.zig").__fixtfdi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixtfsi.zig b/lib/std/special/compiler_rt/fixtfsi.zig
index 15e89a11b0b0820fda7bd70ead0a3e36d14b3ac8..cf614ec8b378d99e4b46eb3734bf27896115cf26 100644
--- a/lib/std/special/compiler_rt/fixtfsi.zig
+++ b/lib/std/special/compiler_rt/fixtfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixtfsi_test.zig b/lib/std/special/compiler_rt/fixtfsi_test.zig
index c7294fe250146af0346957d38c6fba8e07a5c408..86207f7dbcb48f8efcb441cb90caaa8f87c483e8 100644
--- a/lib/std/special/compiler_rt/fixtfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixtfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixtfsi = @import("fixtfsi.zig").__fixtfsi;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixtfti.zig b/lib/std/special/compiler_rt/fixtfti.zig
index 733fa1eed1b0be8f4b89f480f2144712db3f039f..e796b86d503b064f34711a934e6f62e12d6ab0a7 100644
--- a/lib/std/special/compiler_rt/fixtfti.zig
+++ b/lib/std/special/compiler_rt/fixtfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixint = @import("fixint.zig").fixint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixtfti_test.zig b/lib/std/special/compiler_rt/fixtfti_test.zig
index 6b8218e2f61a9f1ea1958c4ae8694bd8cb082bc8..65a64ac4311b13b2bb9e4b16077e3f2a9589cdba 100644
--- a/lib/std/special/compiler_rt/fixtfti_test.zig
+++ b/lib/std/special/compiler_rt/fixtfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixtfti = @import("fixtfti.zig").__fixtfti;
 const std = @import("std");
 const math = std.math;
diff --git a/lib/std/special/compiler_rt/fixuint.zig b/lib/std/special/compiler_rt/fixuint.zig
index 1e96b7c2834608ebfc6fa67fe5166f81b9aa9548..01eb03baa52859ef90384a683dfa4851c5d5d12f 100644
--- a/lib/std/special/compiler_rt/fixuint.zig
+++ b/lib/std/special/compiler_rt/fixuint.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const is_test = @import("builtin").is_test;
 const Log2Int = @import("std").math.Log2Int;
 
diff --git a/lib/std/special/compiler_rt/fixunsdfdi.zig b/lib/std/special/compiler_rt/fixunsdfdi.zig
index 800c9b1148ad4d3074dc7b1e9f48cee630e2fd17..19f94c95a840efec50eabae54dd74587983e55b7 100644
--- a/lib/std/special/compiler_rt/fixunsdfdi.zig
+++ b/lib/std/special/compiler_rt/fixunsdfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunsdfdi_test.zig b/lib/std/special/compiler_rt/fixunsdfdi_test.zig
index 67eeb70520cd7df29cbb1a5094ff0afeb51613f4..da6fef33764df92d5285124a3329457ea4094d6a 100644
--- a/lib/std/special/compiler_rt/fixunsdfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixunsdfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunsdfdi = @import("fixunsdfdi.zig").__fixunsdfdi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunsdfsi.zig b/lib/std/special/compiler_rt/fixunsdfsi.zig
index 156c21a887b10dea35836310d96435541b22317b..2f622aff39529dbf61242ff30a132550a6021f73 100644
--- a/lib/std/special/compiler_rt/fixunsdfsi.zig
+++ b/lib/std/special/compiler_rt/fixunsdfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunsdfsi_test.zig b/lib/std/special/compiler_rt/fixunsdfsi_test.zig
index c006473fb95b606788538c9384730f6a884bf53f..ddbb05c70509324fb215482b2822dfdf3b9e5bd8 100644
--- a/lib/std/special/compiler_rt/fixunsdfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixunsdfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunsdfsi = @import("fixunsdfsi.zig").__fixunsdfsi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunsdfti.zig b/lib/std/special/compiler_rt/fixunsdfti.zig
index 3dcec6bf8987635352c1841137f88f331e9f422a..f11f6b937f507806a5be284544735baa08d50d5a 100644
--- a/lib/std/special/compiler_rt/fixunsdfti.zig
+++ b/lib/std/special/compiler_rt/fixunsdfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunsdfti_test.zig b/lib/std/special/compiler_rt/fixunsdfti_test.zig
index 8241900692e086800fc57ee369e379913f176a1a..11ba3bc425442092f1fc915623eb11b98b80520d 100644
--- a/lib/std/special/compiler_rt/fixunsdfti_test.zig
+++ b/lib/std/special/compiler_rt/fixunsdfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunsdfti = @import("fixunsdfti.zig").__fixunsdfti;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunssfdi.zig b/lib/std/special/compiler_rt/fixunssfdi.zig
index ec00a7ee35c50814414320465012b127eed644b8..5dd9b27d1042ae151a06ad14ad876089dfba06a1 100644
--- a/lib/std/special/compiler_rt/fixunssfdi.zig
+++ b/lib/std/special/compiler_rt/fixunssfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunssfdi_test.zig b/lib/std/special/compiler_rt/fixunssfdi_test.zig
index e2089822d2bc53dc59adc78594c28b0f90348ad8..018c94ce7c79ebc98ce52486b7009107c9dab703 100644
--- a/lib/std/special/compiler_rt/fixunssfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixunssfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunssfdi = @import("fixunssfdi.zig").__fixunssfdi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunssfsi.zig b/lib/std/special/compiler_rt/fixunssfsi.zig
index a4e5a323f5927e856d9f33e34c1df024145fbad3..ce983cb78a8c9e6c440f1a19c1dc07fba0dce3aa 100644
--- a/lib/std/special/compiler_rt/fixunssfsi.zig
+++ b/lib/std/special/compiler_rt/fixunssfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunssfsi_test.zig b/lib/std/special/compiler_rt/fixunssfsi_test.zig
index 4aee84d2d20f5d95819b1ba3415d6ae648a1c9cd..98cac8a1e40a94fdc988477c9b5bcf2434ceeadf 100644
--- a/lib/std/special/compiler_rt/fixunssfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixunssfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunssfsi = @import("fixunssfsi.zig").__fixunssfsi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunssfti.zig b/lib/std/special/compiler_rt/fixunssfti.zig
index dff9eb74980f6136a8af30ea350c3f42d1160ae7..bbaeafd6a8757fe3ba48adeeaabddfa25660ff46 100644
--- a/lib/std/special/compiler_rt/fixunssfti.zig
+++ b/lib/std/special/compiler_rt/fixunssfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunssfti_test.zig b/lib/std/special/compiler_rt/fixunssfti_test.zig
index 4cb27cbb8a9bdf2652de702e36fe6b1f6f9eb5b1..b5c79906b7af38fcb6d793e1ea2952b9d6d81e37 100644
--- a/lib/std/special/compiler_rt/fixunssfti_test.zig
+++ b/lib/std/special/compiler_rt/fixunssfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunssfti = @import("fixunssfti.zig").__fixunssfti;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunstfdi.zig b/lib/std/special/compiler_rt/fixunstfdi.zig
index 907116c1650ee53ba9d5b3417ef5ec6253513be9..3062e5322c1fda5d2ac010f99bfe71d9e31cd2b9 100644
--- a/lib/std/special/compiler_rt/fixunstfdi.zig
+++ b/lib/std/special/compiler_rt/fixunstfdi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunstfdi_test.zig b/lib/std/special/compiler_rt/fixunstfdi_test.zig
index 0d47641c092af8fbfd0b8931da7df0b8faed3be5..299c509ceab49ca3db9cd23b4d7349f9de12ede7 100644
--- a/lib/std/special/compiler_rt/fixunstfdi_test.zig
+++ b/lib/std/special/compiler_rt/fixunstfdi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunstfdi = @import("fixunstfdi.zig").__fixunstfdi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunstfsi.zig b/lib/std/special/compiler_rt/fixunstfsi.zig
index c66a3f18b492a2bfa05a91324dbe5784a5db6847..6836e5df36f390d5f003c924274c42e57611421d 100644
--- a/lib/std/special/compiler_rt/fixunstfsi.zig
+++ b/lib/std/special/compiler_rt/fixunstfsi.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunstfsi_test.zig b/lib/std/special/compiler_rt/fixunstfsi_test.zig
index 286567629a3f7afe45fb746b4ee95915ab672344..2e5139e5e26c8ceee4605de9cdd9548012669a87 100644
--- a/lib/std/special/compiler_rt/fixunstfsi_test.zig
+++ b/lib/std/special/compiler_rt/fixunstfsi_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunstfsi = @import("fixunstfsi.zig").__fixunstfsi;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/fixunstfti.zig b/lib/std/special/compiler_rt/fixunstfti.zig
index 1867c69234ba49606f774885efba862449e7dedb..da3319ee5c851dd2f8c08b5bf0e494514f5642e4 100644
--- a/lib/std/special/compiler_rt/fixunstfti.zig
+++ b/lib/std/special/compiler_rt/fixunstfti.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const fixuint = @import("fixuint.zig").fixuint;
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/fixunstfti_test.zig b/lib/std/special/compiler_rt/fixunstfti_test.zig
index 62a9bbfecfb8c4a5832f34083cbd11ef11309fbc..2fbde63e63fc3a48a3ec443e92f25caec937c69a 100644
--- a/lib/std/special/compiler_rt/fixunstfti_test.zig
+++ b/lib/std/special/compiler_rt/fixunstfti_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __fixunstfti = @import("fixunstfti.zig").__fixunstfti;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatdidf.zig b/lib/std/special/compiler_rt/floatdidf.zig
index afe9e906fd81533a71072ec193bad214bfb85802..2a1ba4cadd80d097d424fda4392677a13a40deaf 100644
--- a/lib/std/special/compiler_rt/floatdidf.zig
+++ b/lib/std/special/compiler_rt/floatdidf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 
diff --git a/lib/std/special/compiler_rt/floatdidf_test.zig b/lib/std/special/compiler_rt/floatdidf_test.zig
index c8541838095a4daaf54a6ddf277bb888018985e5..a2072cc922b9281ff30371bf5fd25dd30a63ac6c 100644
--- a/lib/std/special/compiler_rt/floatdidf_test.zig
+++ b/lib/std/special/compiler_rt/floatdidf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatdidf = @import("floatdidf.zig").__floatdidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatditf.zig b/lib/std/special/compiler_rt/floatditf.zig
index 581a0e0532bc45f5348db802f4718b6aced93c44..aa945ca5dd9fdad15798c9579d4bbe384788abd1 100644
--- a/lib/std/special/compiler_rt/floatditf.zig
+++ b/lib/std/special/compiler_rt/floatditf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatditf_test.zig b/lib/std/special/compiler_rt/floatditf_test.zig
index 8cdb8157a960d26f4f3e38ede3844710e8b1ef48..ff4f10927cd75726b97cb2f1c9d17f15e7f2244f 100644
--- a/lib/std/special/compiler_rt/floatditf_test.zig
+++ b/lib/std/special/compiler_rt/floatditf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatditf = @import("floatditf.zig").__floatditf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatsiXf.zig b/lib/std/special/compiler_rt/floatsiXf.zig
index 6a1dc422b7d75b27d50003ca281a2f3f34f916b1..75db3d704051c390e326eb4fef3f697a0fbdd9e9 100644
--- a/lib/std/special/compiler_rt/floatsiXf.zig
+++ b/lib/std/special/compiler_rt/floatsiXf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floattidf.zig b/lib/std/special/compiler_rt/floattidf.zig
index 6b5013287b9e45f8a8bdc9ea6e5990a68876a029..73d86f77470d4be77dbc70f0e8194b9e95f66f34 100644
--- a/lib/std/special/compiler_rt/floattidf.zig
+++ b/lib/std/special/compiler_rt/floattidf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floattidf_test.zig b/lib/std/special/compiler_rt/floattidf_test.zig
index 4914342c31832830e64a1cb7dd6329d26ae17bf3..d299ed80874d2b1354a9a60ed93500c03a9304bb 100644
--- a/lib/std/special/compiler_rt/floattidf_test.zig
+++ b/lib/std/special/compiler_rt/floattidf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floattidf = @import("floattidf.zig").__floattidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floattisf.zig b/lib/std/special/compiler_rt/floattisf.zig
index 3f020dadd845c83fec73e046059eaf291af80555..7975d59e8354bd476f5b1e4e2d1273170c421e99 100644
--- a/lib/std/special/compiler_rt/floattisf.zig
+++ b/lib/std/special/compiler_rt/floattisf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floattisf_test.zig b/lib/std/special/compiler_rt/floattisf_test.zig
index a6aa115307310eaca87e082bedbbac2af538bf40..f5638c2106be224dfa67f08690bdcd16cfb32920 100644
--- a/lib/std/special/compiler_rt/floattisf_test.zig
+++ b/lib/std/special/compiler_rt/floattisf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floattisf = @import("floattisf.zig").__floattisf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floattitf.zig b/lib/std/special/compiler_rt/floattitf.zig
index 90bc241306fe2be609e32800a4362547eaed911c..87408ea4455094059daed43e9e06fb30351e6f19 100644
--- a/lib/std/special/compiler_rt/floattitf.zig
+++ b/lib/std/special/compiler_rt/floattitf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floattitf_test.zig b/lib/std/special/compiler_rt/floattitf_test.zig
index 53e3e48bdb6a8cd96aec7ecfb5a4dc098bdd37e1..c4014a62981fec767286fb3d3b0cb43a7dba7ec6 100644
--- a/lib/std/special/compiler_rt/floattitf_test.zig
+++ b/lib/std/special/compiler_rt/floattitf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floattitf = @import("floattitf.zig").__floattitf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatundidf.zig b/lib/std/special/compiler_rt/floatundidf.zig
index 1efe55da4062babf326dfcddc78b84b0137b7d61..a88ca4a03d4e89a5a0fb7e674008525828b8c793 100644
--- a/lib/std/special/compiler_rt/floatundidf.zig
+++ b/lib/std/special/compiler_rt/floatundidf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 
diff --git a/lib/std/special/compiler_rt/floatundidf_test.zig b/lib/std/special/compiler_rt/floatundidf_test.zig
index 084ada51c9077d9a3e8ff1472315593733306063..c0651cb3593239e230454577556ab6bf6a01ac6a 100644
--- a/lib/std/special/compiler_rt/floatundidf_test.zig
+++ b/lib/std/special/compiler_rt/floatundidf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatundidf = @import("floatundidf.zig").__floatundidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatundisf.zig b/lib/std/special/compiler_rt/floatundisf.zig
index ff242721d6e09f8e600077b02fa4ec4c196ccf26..b580ec91fd16dac436f4d7636aedf48bcf81eba0 100644
--- a/lib/std/special/compiler_rt/floatundisf.zig
+++ b/lib/std/special/compiler_rt/floatundisf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floatunditf.zig b/lib/std/special/compiler_rt/floatunditf.zig
index 209f66fc2e0402db558873d0a0a3c9814e317a9c..90191c63882db346fe8ccd12ce3b5f64fced21dd 100644
--- a/lib/std/special/compiler_rt/floatunditf.zig
+++ b/lib/std/special/compiler_rt/floatunditf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatunditf_test.zig b/lib/std/special/compiler_rt/floatunditf_test.zig
index 7bb3333693d96df77e8a01653e8fc30e6213f625..19d1b4a2a3a732c8f7421bd015c73137336abdbe 100644
--- a/lib/std/special/compiler_rt/floatunditf_test.zig
+++ b/lib/std/special/compiler_rt/floatunditf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatunditf = @import("floatunditf.zig").__floatunditf;
 
 fn test__floatunditf(a: u64, expected_hi: u64, expected_lo: u64) void {
diff --git a/lib/std/special/compiler_rt/floatunsidf.zig b/lib/std/special/compiler_rt/floatunsidf.zig
index 771b4938e1cca19354408ff31cb040cdf588b9bb..c9a31eff8ebcca2fbcb463746db907022ec156c7 100644
--- a/lib/std/special/compiler_rt/floatunsidf.zig
+++ b/lib/std/special/compiler_rt/floatunsidf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floatunsisf.zig b/lib/std/special/compiler_rt/floatunsisf.zig
index c11243e6e43e6628e0563e1448b472b5ef3462e9..17eae5109210c3fb8997db1d9ccc199e2446c2d0 100644
--- a/lib/std/special/compiler_rt/floatunsisf.zig
+++ b/lib/std/special/compiler_rt/floatunsisf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/floatunsitf.zig b/lib/std/special/compiler_rt/floatunsitf.zig
index a10ff6b70378448c60cbe7e00ed5c71d26280f07..ceb55f12c8521109e57b9402b982a028543d49fd 100644
--- a/lib/std/special/compiler_rt/floatunsitf.zig
+++ b/lib/std/special/compiler_rt/floatunsitf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatunsitf_test.zig b/lib/std/special/compiler_rt/floatunsitf_test.zig
index 52e4786903e5c9605de536b5149caeb81256581d..deb95ca3964123dd1c71717d447047c50bda99b8 100644
--- a/lib/std/special/compiler_rt/floatunsitf_test.zig
+++ b/lib/std/special/compiler_rt/floatunsitf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatunsitf = @import("floatunsitf.zig").__floatunsitf;
 
 fn test__floatunsitf(a: u64, expected_hi: u64, expected_lo: u64) void {
diff --git a/lib/std/special/compiler_rt/floatuntidf.zig b/lib/std/special/compiler_rt/floatuntidf.zig
index 5b5adc04910af64e03de2a12765896f0b2660d2f..adb804d0ec4d8c27f99474a46a8cb426c874387a 100644
--- a/lib/std/special/compiler_rt/floatuntidf.zig
+++ b/lib/std/special/compiler_rt/floatuntidf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatuntidf_test.zig b/lib/std/special/compiler_rt/floatuntidf_test.zig
index 974f3e4be3e2c55a9c0ed04d47ef52655e2e8253..cce38938602e0a691a65be71d52e3808a3e4ecc9 100644
--- a/lib/std/special/compiler_rt/floatuntidf_test.zig
+++ b/lib/std/special/compiler_rt/floatuntidf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatuntidf = @import("floatuntidf.zig").__floatuntidf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatuntisf.zig b/lib/std/special/compiler_rt/floatuntisf.zig
index 33e6e41a84fcb28ecdf21f8d447ba58227208ca9..d0c9a7656287af63462bff0fd406b3dd668cc2fd 100644
--- a/lib/std/special/compiler_rt/floatuntisf.zig
+++ b/lib/std/special/compiler_rt/floatuntisf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatuntisf_test.zig b/lib/std/special/compiler_rt/floatuntisf_test.zig
index 3a9780706694e37bcba71f919c622810d247f1da..42379d808487ee876b872ed65d933b03486ea8fd 100644
--- a/lib/std/special/compiler_rt/floatuntisf_test.zig
+++ b/lib/std/special/compiler_rt/floatuntisf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatuntisf = @import("floatuntisf.zig").__floatuntisf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/floatuntitf.zig b/lib/std/special/compiler_rt/floatuntitf.zig
index 0b96076206dbdb69368519a94cd4121032151abf..c87ff50e9a64f0d666d2b0962b6a3b047b1f4295 100644
--- a/lib/std/special/compiler_rt/floatuntitf.zig
+++ b/lib/std/special/compiler_rt/floatuntitf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 const std = @import("std");
diff --git a/lib/std/special/compiler_rt/floatuntitf_test.zig b/lib/std/special/compiler_rt/floatuntitf_test.zig
index 09f3eabb3e60a79f7de5d115b270a7ca39584cd8..62c9b631dff4a14a91482b7cba0b021079c0aa70 100644
--- a/lib/std/special/compiler_rt/floatuntitf_test.zig
+++ b/lib/std/special/compiler_rt/floatuntitf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __floatuntitf = @import("floatuntitf.zig").__floatuntitf;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/int.zig b/lib/std/special/compiler_rt/int.zig
index a72c13e2331e6c2b1bc705a2405fbfe334acebe0..141c4e52c16e602fa252f0d6e3fe70cfff7f4e17 100644
--- a/lib/std/special/compiler_rt/int.zig
+++ b/lib/std/special/compiler_rt/int.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Builtin functions that operate on integer types
 const builtin = @import("builtin");
 const testing = @import("std").testing;
diff --git a/lib/std/special/compiler_rt/lshrdi3_test.zig b/lib/std/special/compiler_rt/lshrdi3_test.zig
index 906d428d1e27424eba5659082c3bb227947569f0..de83f0a9c8b9770278448972651aa84e1140ada6 100644
--- a/lib/std/special/compiler_rt/lshrdi3_test.zig
+++ b/lib/std/special/compiler_rt/lshrdi3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __lshrdi3 = @import("shift.zig").__lshrdi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/lshrti3_test.zig b/lib/std/special/compiler_rt/lshrti3_test.zig
index c0aa191a6f628859151cbaed16c6b863c8a2f571..f831e8b1328d9e95e017568070a8ae49b31074c7 100644
--- a/lib/std/special/compiler_rt/lshrti3_test.zig
+++ b/lib/std/special/compiler_rt/lshrti3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __lshrti3 = @import("shift.zig").__lshrti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/modti3.zig b/lib/std/special/compiler_rt/modti3.zig
index 78be44026c027311208392983143b037adfe6cf0..1f859c2329136b10877ab65015ec5a55995c4723 100644
--- a/lib/std/special/compiler_rt/modti3.zig
+++ b/lib/std/special/compiler_rt/modti3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/2ffb1b0413efa9a24eb3c49e710e36f92e2cb50b/compiler-rt/lib/builtins/modti3.c
diff --git a/lib/std/special/compiler_rt/modti3_test.zig b/lib/std/special/compiler_rt/modti3_test.zig
index 10f81d59d2fd53c42e5711178dbcc2be32e65b8e..cad60c015eb94d785f98d8ddd46f51fb0e6dc8be 100644
--- a/lib/std/special/compiler_rt/modti3_test.zig
+++ b/lib/std/special/compiler_rt/modti3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __modti3 = @import("modti3.zig").__modti3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/mulXf3.zig b/lib/std/special/compiler_rt/mulXf3.zig
index af49d27952aae1196733e84e26df329a2bcf584c..b6984ebbb690cb834de4738682140a1e18ab41e3 100644
--- a/lib/std/special/compiler_rt/mulXf3.zig
+++ b/lib/std/special/compiler_rt/mulXf3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/2ffb1b0413efa9a24eb3c49e710e36f92e2cb50b/compiler-rt/lib/builtins/fp_mul_impl.inc
diff --git a/lib/std/special/compiler_rt/mulXf3_test.zig b/lib/std/special/compiler_rt/mulXf3_test.zig
index 57dc38532174095c9fda6f4cc028bf5bbc3766d0..c9994b089ba96dda9a82dec2befb2473dd190d6e 100644
--- a/lib/std/special/compiler_rt/mulXf3_test.zig
+++ b/lib/std/special/compiler_rt/mulXf3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Ported from:
 //
 // https://github.com/llvm/llvm-project/blob/2ffb1b0413efa9a24eb3c49e710e36f92e2cb50b/compiler-rt/test/builtins/Unit/multf3_test.c
diff --git a/lib/std/special/compiler_rt/muldi3.zig b/lib/std/special/compiler_rt/muldi3.zig
index 4f605d441cb7c0a68bc392d3b6a6691ee495e1d8..2de96ea66c79e8aebbe3139d16cfe6ac27a8f4ec 100644
--- a/lib/std/special/compiler_rt/muldi3.zig
+++ b/lib/std/special/compiler_rt/muldi3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 // Ported from
diff --git a/lib/std/special/compiler_rt/muldi3_test.zig b/lib/std/special/compiler_rt/muldi3_test.zig
index db4daf1e1ef09c74353572a8ad51350b8e8ba0d4..b4962189cd250fd5bc66749bd717360635039a58 100644
--- a/lib/std/special/compiler_rt/muldi3_test.zig
+++ b/lib/std/special/compiler_rt/muldi3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __muldi3 = @import("muldi3.zig").__muldi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/mulodi4.zig b/lib/std/special/compiler_rt/mulodi4.zig
index b70d1657e71130f8c0038c7ddbf1aad43e59bc7e..b05931e93763892feaac8164c8c15fa532765bf5 100644
--- a/lib/std/special/compiler_rt/mulodi4.zig
+++ b/lib/std/special/compiler_rt/mulodi4.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
 const maxInt = std.math.maxInt;
diff --git a/lib/std/special/compiler_rt/mulodi4_test.zig b/lib/std/special/compiler_rt/mulodi4_test.zig
index 803d60e8fa827988847d5ab62d953c0b9669e80a..a96f7a1996ee72909e256751bc13e6e0a342cfb5 100644
--- a/lib/std/special/compiler_rt/mulodi4_test.zig
+++ b/lib/std/special/compiler_rt/mulodi4_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __mulodi4 = @import("mulodi4.zig").__mulodi4;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/muloti4.zig b/lib/std/special/compiler_rt/muloti4.zig
index 190959b8014e3275ff61524a2e6aeceb31907f78..4beafa3e154e645dd3ce28b409b9aaba61b25279 100644
--- a/lib/std/special/compiler_rt/muloti4.zig
+++ b/lib/std/special/compiler_rt/muloti4.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
 
diff --git a/lib/std/special/compiler_rt/muloti4_test.zig b/lib/std/special/compiler_rt/muloti4_test.zig
index f94a13e04f9b8ead3b4c305e50bb5392755fbdd3..44ab93a0699dbb070640cdc5d9fa6928454277a1 100644
--- a/lib/std/special/compiler_rt/muloti4_test.zig
+++ b/lib/std/special/compiler_rt/muloti4_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __muloti4 = @import("muloti4.zig").__muloti4;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/multi3.zig b/lib/std/special/compiler_rt/multi3.zig
index c237f1b259de431cf1d6f707a62bf5f9b7726b46..fad73789ac601e11361491eaf0df916b96c6648a 100644
--- a/lib/std/special/compiler_rt/multi3.zig
+++ b/lib/std/special/compiler_rt/multi3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
 
diff --git a/lib/std/special/compiler_rt/multi3_test.zig b/lib/std/special/compiler_rt/multi3_test.zig
index 92c580e20f19724b8728505f7cdd5c8e167339f3..04b70d05385353413b15fa3f3d97be6116977677 100644
--- a/lib/std/special/compiler_rt/multi3_test.zig
+++ b/lib/std/special/compiler_rt/multi3_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __multi3 = @import("multi3.zig").__multi3;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/negXf2.zig b/lib/std/special/compiler_rt/negXf2.zig
index 0739ecb83c8e7912caa68883fe45d351d44862fe..11f9e401e95ba6e84b4ac0a7bdcbb2eaadaa340d 100644
--- a/lib/std/special/compiler_rt/negXf2.zig
+++ b/lib/std/special/compiler_rt/negXf2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 pub fn __negsf2(a: f32) callconv(.C) f32 {
diff --git a/lib/std/special/compiler_rt/popcountdi2.zig b/lib/std/special/compiler_rt/popcountdi2.zig
index b7e7220c7b8c109ab8f49e74d1b0e067e561c0fd..5bb49ce402f7ec5715150244ac734b13d8ceb35e 100644
--- a/lib/std/special/compiler_rt/popcountdi2.zig
+++ b/lib/std/special/compiler_rt/popcountdi2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
 
diff --git a/lib/std/special/compiler_rt/popcountdi2_test.zig b/lib/std/special/compiler_rt/popcountdi2_test.zig
index fe02786e15bd1dc918497d7ca570989907e4b588..6ea181bf0e12a403d852ded4fd3d5397f12d0cc5 100644
--- a/lib/std/special/compiler_rt/popcountdi2_test.zig
+++ b/lib/std/special/compiler_rt/popcountdi2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __popcountdi2 = @import("popcountdi2.zig").__popcountdi2;
 const testing = @import("std").testing;
 
diff --git a/lib/std/special/compiler_rt/shift.zig b/lib/std/special/compiler_rt/shift.zig
index f811c5124d66dfc71197daa8f63c6e4cfe7d20ec..1609cb115ce8411889b466fb8194e90a63f7fff0 100644
--- a/lib/std/special/compiler_rt/shift.zig
+++ b/lib/std/special/compiler_rt/shift.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 const Log2Int = std.math.Log2Int;
diff --git a/lib/std/special/compiler_rt/stack_probe.zig b/lib/std/special/compiler_rt/stack_probe.zig
index dd441b2f329ff14a2303d0d544b231f43126e407..58cce9fb6f9d987b34a393de3f47b1839529ba6d 100644
--- a/lib/std/special/compiler_rt/stack_probe.zig
+++ b/lib/std/special/compiler_rt/stack_probe.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 
 // Zig's own stack-probe routine (available only on x86 and x86_64)
diff --git a/lib/std/special/compiler_rt/truncXfYf2.zig b/lib/std/special/compiler_rt/truncXfYf2.zig
index d345bf30a3cc8b595d7ef40cef0730617455fbe1..e096e7e4f0a2246763e7713a3fb76140f6cc490d 100644
--- a/lib/std/special/compiler_rt/truncXfYf2.zig
+++ b/lib/std/special/compiler_rt/truncXfYf2.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 pub fn __truncsfhf2(a: f32) callconv(.C) u16 {
diff --git a/lib/std/special/compiler_rt/truncXfYf2_test.zig b/lib/std/special/compiler_rt/truncXfYf2_test.zig
index baec2a445061f8a6b5eae624bb2a0dd6b79ab1a9..048005f86d9e264d3ef341998d72393bac27a176 100644
--- a/lib/std/special/compiler_rt/truncXfYf2_test.zig
+++ b/lib/std/special/compiler_rt/truncXfYf2_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const __truncsfhf2 = @import("truncXfYf2.zig").__truncsfhf2;
 
 fn test__truncsfhf2(a: u32, expected: u16) void {
diff --git a/lib/std/special/compiler_rt/udivmod.zig b/lib/std/special/compiler_rt/udivmod.zig
index ba53d1dee01cf9b00358cdb568b9e43ef0c02e87..2836f34c8550bf296f9ffd07e5eed5ddc97c0e48 100644
--- a/lib/std/special/compiler_rt/udivmod.zig
+++ b/lib/std/special/compiler_rt/udivmod.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const is_test = builtin.is_test;
 
diff --git a/lib/std/special/compiler_rt/udivmoddi4_test.zig b/lib/std/special/compiler_rt/udivmoddi4_test.zig
index 48a38faa044fcdaf60301ae45e62ba5a9b3d4fa2..74a4a828e85e6b8243f6d763b0cc514fb3cdfba0 100644
--- a/lib/std/special/compiler_rt/udivmoddi4_test.zig
+++ b/lib/std/special/compiler_rt/udivmoddi4_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Disable formatting to avoid unnecessary source repository bloat.
 // zig fmt: off
 const __udivmoddi4 = @import("int.zig").__udivmoddi4;
diff --git a/lib/std/special/compiler_rt/udivmodti4.zig b/lib/std/special/compiler_rt/udivmodti4.zig
index cc1141dbbca1e8f7faa7dab8ec4516602db04c0c..ff33a35680b0dea3fc2e6939836ad39d0fd84f91 100644
--- a/lib/std/special/compiler_rt/udivmodti4.zig
+++ b/lib/std/special/compiler_rt/udivmodti4.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const udivmod = @import("udivmod.zig").udivmod;
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
diff --git a/lib/std/special/compiler_rt/udivmodti4_test.zig b/lib/std/special/compiler_rt/udivmodti4_test.zig
index fdeae7c02b9dfd9140c4bd8ef3aeee881ab6d743..1852d5c7afdfadd52595b18cdca667c053a74f9d 100644
--- a/lib/std/special/compiler_rt/udivmodti4_test.zig
+++ b/lib/std/special/compiler_rt/udivmodti4_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // Disable formatting to avoid unnecessary source repository bloat.
 // zig fmt: off
 const __udivmodti4 = @import("udivmodti4.zig").__udivmodti4;
diff --git a/lib/std/special/compiler_rt/udivti3.zig b/lib/std/special/compiler_rt/udivti3.zig
index 52afa0420f5d6dd8a7ca92e80491589c3e56c32a..187b4a15773de84431a194c37374e5739ed43f8d 100644
--- a/lib/std/special/compiler_rt/udivti3.zig
+++ b/lib/std/special/compiler_rt/udivti3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const udivmodti4 = @import("udivmodti4.zig");
 const builtin = @import("builtin");
 
diff --git a/lib/std/special/compiler_rt/umodti3.zig b/lib/std/special/compiler_rt/umodti3.zig
index 29eb572892b404f7e81599a79e47e9563b50de06..3bc5be8ffc85de0db56a368d2355e3b75740c8d4 100644
--- a/lib/std/special/compiler_rt/umodti3.zig
+++ b/lib/std/special/compiler_rt/umodti3.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const udivmodti4 = @import("udivmodti4.zig");
 const builtin = @import("builtin");
 const compiler_rt = @import("../compiler_rt.zig");
diff --git a/lib/std/special/init-exe/build.zig b/lib/std/special/init-exe/build.zig
index fd71588c5f18ba5901cfa635f897aff9b632a1a4..db818cbe920b23fb7491bd3d8e297571f7f525ac 100644
--- a/lib/std/special/init-exe/build.zig
+++ b/lib/std/special/init-exe/build.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const Builder = @import("std").build.Builder;
 
 pub fn build(b: *Builder) void {
diff --git a/lib/std/special/init-exe/src/main.zig b/lib/std/special/init-exe/src/main.zig
index d29869ff88feb94cd5a5fd28d760824920f269ac..e4b2e7d8ece5b54ff56901bc338589d1f02b8023 100644
--- a/lib/std/special/init-exe/src/main.zig
+++ b/lib/std/special/init-exe/src/main.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 pub fn main() anyerror!void {
diff --git a/lib/std/special/init-lib/build.zig b/lib/std/special/init-lib/build.zig
index 558e447c1547e40dc97c85e643a7695334dbdbf7..edc8a0215d2623e33ea812ed1189296c63889458 100644
--- a/lib/std/special/init-lib/build.zig
+++ b/lib/std/special/init-lib/build.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const Builder = @import("std").build.Builder;
 
 pub fn build(b: *Builder) void {
diff --git a/lib/std/special/init-lib/src/main.zig b/lib/std/special/init-lib/src/main.zig
index 747bb08573c1d6322417b5b8550631ad2ca1bad9..9a82bcc26b4b227492595fd7beaf530ad4139ccf 100644
--- a/lib/std/special/init-lib/src/main.zig
+++ b/lib/std/special/init-lib/src/main.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const testing = std.testing;
 
diff --git a/lib/std/special/test_runner.zig b/lib/std/special/test_runner.zig
index 426715163825936c2077cdf0afc384f7aef7b83b..87b011ede89bac9f522ec4aa43c9ead852117b7d 100644
--- a/lib/std/special/test_runner.zig
+++ b/lib/std/special/test_runner.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const io = std.io;
 const builtin = @import("builtin");
diff --git a/lib/std/spinlock.zig b/lib/std/spinlock.zig
index 0af08e9a84f77ab7516c28c710c8ccc4022a1aa0..d72ac14ecfd98ba9833713716d9069bbb65729b8 100644
--- a/lib/std/spinlock.zig
+++ b/lib/std/spinlock.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = @import("builtin");
 
diff --git a/lib/std/start.zig b/lib/std/start.zig
index 811e05012fd06cbfe4cb245e11ffca38a6a53bfb..2b1bae060e69f4e95bad94e8cfb067faca3c9779 100644
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 // This file is included in the compilation unit when exporting an executable.
 
 const root = @import("root");
diff --git a/lib/std/start_windows_tls.zig b/lib/std/start_windows_tls.zig
index f6dd2bc13261c6946b8669baf9cded8b286f75ca..18c016d2065c28a766e8661b8ae4c3b0fb706a4c 100644
--- a/lib/std/start_windows_tls.zig
+++ b/lib/std/start_windows_tls.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const builtin = std.builtin;
 
diff --git a/lib/std/std.zig b/lib/std/std.zig
index 940fc498d6350ffdc570e1ce8798f86afc76e6ab..2ff44f5e414beca00f8ce641244c2f1976478129 100644
--- a/lib/std/std.zig
+++ b/lib/std/std.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 pub const ArrayList = @import("array_list.zig").ArrayList;
 pub const ArrayListAligned = @import("array_list.zig").ArrayListAligned;
 pub const ArrayListAlignedUnmanaged = @import("array_list.zig").ArrayListAlignedUnmanaged;
diff --git a/lib/std/target.zig b/lib/std/target.zig
index 14cea9dd573a9ca35ad618148b8506ae1eb8a6da..b162bdd0c3717f5b89af0f10d7cab2fabc5d9406 100644
--- a/lib/std/target.zig
+++ b/lib/std/target.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const mem = std.mem;
 const builtin = std.builtin;
diff --git a/lib/std/target/aarch64.zig b/lib/std/target/aarch64.zig
index 9af95dfadad0201d3baf3f59c19f894fa184376a..0f64b2fd69422cbc20007bc5a504ed69ac945b77 100644
--- a/lib/std/target/aarch64.zig
+++ b/lib/std/target/aarch64.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/amdgpu.zig b/lib/std/target/amdgpu.zig
index 4b3f83bbc317ddfa6f2b0cb84fe1f6cabeb32f05..9fa52c317d4b6dfcd43a64e0d0faedf428a0b9d0 100644
--- a/lib/std/target/amdgpu.zig
+++ b/lib/std/target/amdgpu.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/arm.zig b/lib/std/target/arm.zig
index 90b060c03ff4dc2e7794028cb0bc0a78f9228e85..e96a9aa4e603499a080b11e10299f79f8efab185 100644
--- a/lib/std/target/arm.zig
+++ b/lib/std/target/arm.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/avr.zig b/lib/std/target/avr.zig
index af4f5ba5be9792ecb4af02114590b5ba295686a5..3ad603eabe71f336ffbaa3c21c0b2ced3c70fe15 100644
--- a/lib/std/target/avr.zig
+++ b/lib/std/target/avr.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/bpf.zig b/lib/std/target/bpf.zig
index ddb12d3d8515a6916a5ca67f9933cc0a5afdfb39..5e23c233c8d54c0fe21b620eef35da2efe16f240 100644
--- a/lib/std/target/bpf.zig
+++ b/lib/std/target/bpf.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/hexagon.zig b/lib/std/target/hexagon.zig
index f429099d882f3da38b4fdda834c78c5ae71fd0b6..c5eac1886ff5b5edabfecc5946232a0bd97b9373 100644
--- a/lib/std/target/hexagon.zig
+++ b/lib/std/target/hexagon.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/mips.zig b/lib/std/target/mips.zig
index fc95b2dee8e7811c72bbc7437c5a8967a8cea4b5..6d82caf0c0a0414cf765470c28fcda4d1e1d7a5d 100644
--- a/lib/std/target/mips.zig
+++ b/lib/std/target/mips.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/msp430.zig b/lib/std/target/msp430.zig
index 947137b3e28cd1e7e3a399b68f82f3a83a4b3843..38ea358f905143beb5c33d54f3046d6060c553fb 100644
--- a/lib/std/target/msp430.zig
+++ b/lib/std/target/msp430.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/nvptx.zig b/lib/std/target/nvptx.zig
index d719a6bb7196decc107967f0826fde42286ae1ed..1282c48e1a4cd1ddfedba113bea07050764e100b 100644
--- a/lib/std/target/nvptx.zig
+++ b/lib/std/target/nvptx.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/powerpc.zig b/lib/std/target/powerpc.zig
index 19b050c5bd8823bfddc90e5dede196f38ec04bf8..e13e3dd97f92ad5c4f072cf474d2187d736e7c43 100644
--- a/lib/std/target/powerpc.zig
+++ b/lib/std/target/powerpc.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/riscv.zig b/lib/std/target/riscv.zig
index dbdb1070245140f847f48eb3d86102653d4166e6..9d4429bd5c476d489f075faf6a4324eaf1e01634 100644
--- a/lib/std/target/riscv.zig
+++ b/lib/std/target/riscv.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/sparc.zig b/lib/std/target/sparc.zig
index e1cbc845fca2dacdcdaeb3800e4dd7af68901696..8baac12635022a3c40506528061695868882a6b5 100644
--- a/lib/std/target/sparc.zig
+++ b/lib/std/target/sparc.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/systemz.zig b/lib/std/target/systemz.zig
index f065a8b1694753a203633b7937d3fa2d781be5af..4f3415626c0eaaf432783f894accc3d58c32f7b5 100644
--- a/lib/std/target/systemz.zig
+++ b/lib/std/target/systemz.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/wasm.zig b/lib/std/target/wasm.zig
index 72b2b6d4312a76ecb96d727d1eab812ab2954612..3021834ec42e9a18f3a97047b60b67665c2ee62a 100644
--- a/lib/std/target/wasm.zig
+++ b/lib/std/target/wasm.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/target/x86.zig b/lib/std/target/x86.zig
index bfcd1abc1a33d59499bee93c3d83d901b3766ba1..61219e13b0990489bb75727f76a5c2fe1a0f644a 100644
--- a/lib/std/target/x86.zig
+++ b/lib/std/target/x86.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const CpuFeature = std.Target.Cpu.Feature;
 const CpuModel = std.Target.Cpu.Model;
diff --git a/lib/std/testing.zig b/lib/std/testing.zig
index 27026149bc0d272927f83004d054179872e7830b..658d31bb8272c82574b830b6cf84dfd31818227f 100644
--- a/lib/std/testing.zig
+++ b/lib/std/testing.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const print = std.debug.print;
 
diff --git a/lib/std/testing/failing_allocator.zig b/lib/std/testing/failing_allocator.zig
index d8b243d0fae5172d4421fc58cf654098348f060f..61912e693334ea9edd8f7afe37d00fa8a02b2b49 100644
--- a/lib/std/testing/failing_allocator.zig
+++ b/lib/std/testing/failing_allocator.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 
diff --git a/lib/std/thread.zig b/lib/std/thread.zig
index 3d20f54558d46f0aeabbd2690ed2e9d7a2faa4ae..d73907690e5047084d9ced561169f1a54f681f85 100644
--- a/lib/std/thread.zig
+++ b/lib/std/thread.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const os = std.os;
diff --git a/lib/std/time.zig b/lib/std/time.zig
index 6a0b9a13aa900fdc8263e5be09913fe42d1a18cf..ae128f6b0c7d7ac1676c7f6d6868ae8d124a8267 100644
--- a/lib/std/time.zig
+++ b/lib/std/time.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const builtin = std.builtin;
 const assert = std.debug.assert;
diff --git a/lib/std/time/epoch.zig b/lib/std/time/epoch.zig
index 126c4fceb7386266e28102644dd65ed53e84bcbf..3a42c85a6dc52cfe14e83d2d74929da5494a8103 100644
--- a/lib/std/time/epoch.zig
+++ b/lib/std/time/epoch.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 //! Epoch reference times in terms of their difference from
 //! UTC 1970-01-01 in seconds.
 
diff --git a/lib/std/unicode.zig b/lib/std/unicode.zig
index 2c88d2ba0c936853d5c3a96b893b8d5b8fc60dfc..86b805b8926ec723bd559b97e239b0ea37ec5967 100644
--- a/lib/std/unicode.zig
+++ b/lib/std/unicode.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("./std.zig");
 const builtin = @import("builtin");
 const assert = std.debug.assert;
diff --git a/lib/std/unicode/throughput_test.zig b/lib/std/unicode/throughput_test.zig
index 050340cd556afed74e79767a7cea3e24e1ac3822..e59953a21f306bb9ac205acfecab4f49b1c3dd43 100644
--- a/lib/std/unicode/throughput_test.zig
+++ b/lib/std/unicode/throughput_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std");
 
diff --git a/lib/std/valgrind.zig b/lib/std/valgrind.zig
index 38c4a491e0e1d5643596cd99f03c9f15a3d7b155..5373a2d513d4893d45b7f72cb821708b9cb60b1e 100644
--- a/lib/std/valgrind.zig
+++ b/lib/std/valgrind.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const builtin = @import("builtin");
 const std = @import("std.zig");
 const math = std.math;
diff --git a/lib/std/valgrind/callgrind.zig b/lib/std/valgrind/callgrind.zig
index 82725e91037efe1f7e56769f9a1c9394c984387b..5e025c4ffec1fb4817abb7dff693dbd946b38581 100644
--- a/lib/std/valgrind/callgrind.zig
+++ b/lib/std/valgrind/callgrind.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const valgrind = std.valgrind;
 
diff --git a/lib/std/valgrind/memcheck.zig b/lib/std/valgrind/memcheck.zig
index e0aefa7d5f3003dec92f953721d243ddff9f3f62..449b4c4a462c628d29da2259d48c8ee9ea6c0f08 100644
--- a/lib/std/valgrind/memcheck.zig
+++ b/lib/std/valgrind/memcheck.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const testing = std.testing;
 const valgrind = std.valgrind;
diff --git a/lib/std/zig.zig b/lib/std/zig.zig
index ab6895e1bf73679ad9bd186e3a58b97af2e2301e..34e03eb1648c3e1b99b214f53adca9db5750f0be 100644
--- a/lib/std/zig.zig
+++ b/lib/std/zig.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std.zig");
 const tokenizer = @import("zig/tokenizer.zig");
 
diff --git a/lib/std/zig/ast.zig b/lib/std/zig/ast.zig
index f5149e3a82fe5a6257796fa60bb4cc8f65091b58..f6ba29a9ef7aca000f72137b188a39f2593fe728 100644
--- a/lib/std/zig/ast.zig
+++ b/lib/std/zig/ast.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const testing = std.testing;
diff --git a/lib/std/zig/cross_target.zig b/lib/std/zig/cross_target.zig
index 5466b39f0bf499baa751c6a1f175b485905581c7..75fc5969a5c282d9ba1b95c88ce488bb71927ecb 100644
--- a/lib/std/zig/cross_target.zig
+++ b/lib/std/zig/cross_target.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const Target = std.Target;
diff --git a/lib/std/zig/parse.zig b/lib/std/zig/parse.zig
index e0eb2dd8953e89b66d3c53224b99c6e3ab262587..2af2ee4a45448905c3383f33199ec83dc8a53651 100644
--- a/lib/std/zig/parse.zig
+++ b/lib/std/zig/parse.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const Allocator = std.mem.Allocator;
diff --git a/lib/std/zig/parser_test.zig b/lib/std/zig/parser_test.zig
index 87807255b0d47ce786ebb9d507fc28aaaca3eb6e..8259af32a6993eefa9c2f7215e49c9436d55cfd1 100644
--- a/lib/std/zig/parser_test.zig
+++ b/lib/std/zig/parser_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 test "zig fmt: convert var to anytype" {
     // TODO remove in next release cycle
     try testTransform(
diff --git a/lib/std/zig/perf_test.zig b/lib/std/zig/perf_test.zig
index 689fea96f6c685ca14e1bf4995f64618e20298c3..30ae99e57c60db6c2bc0cd0e5d594b4e91b11016 100644
--- a/lib/std/zig/perf_test.zig
+++ b/lib/std/zig/perf_test.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const mem = std.mem;
 const warn = std.debug.warn;
diff --git a/lib/std/zig/render.zig b/lib/std/zig/render.zig
index 7b9036f259074117769657d0e0b0153d1dc4273c..4d44c41bfa88bd85f59e23c516379bd8e8f80ddf 100644
--- a/lib/std/zig/render.zig
+++ b/lib/std/zig/render.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 const mem = std.mem;
diff --git a/lib/std/zig/string_literal.zig b/lib/std/zig/string_literal.zig
index 560a233723142f82ad82ce2bf52e85c8c5c761de..ca3585944eff935dd6c2b91620fa57d1178c7ea1 100644
--- a/lib/std/zig/string_literal.zig
+++ b/lib/std/zig/string_literal.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const assert = std.debug.assert;
 
diff --git a/lib/std/zig/system.zig b/lib/std/zig/system.zig
index be47da46bb435fe688ba15cd0d445702e496b15c..175b0e4555da54c812e17ade2f01888694131b75 100644
--- a/lib/std/zig/system.zig
+++ b/lib/std/zig/system.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const elf = std.elf;
 const mem = std.mem;
diff --git a/lib/std/zig/system/macos.zig b/lib/std/zig/system/macos.zig
index dd34fe26f9ee1cd963887d7b1cbd7653ede872fb..e0e69b6b8b40ad90061ee4354240aaf3b51a59f5 100644
--- a/lib/std/zig/system/macos.zig
+++ b/lib/std/zig/system/macos.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 
 pub fn version_from_build(build: []const u8) !std.builtin.Version {
diff --git a/lib/std/zig/system/x86.zig b/lib/std/zig/system/x86.zig
index b4964596d2080920aad1de1ff76c34e53c2ac1c6..cbede308dc69d3b7c04256a39c86ff844588f498 100644
--- a/lib/std/zig/system/x86.zig
+++ b/lib/std/zig/system/x86.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("std");
 const Target = std.Target;
 const CrossTarget = std.zig.CrossTarget;
diff --git a/lib/std/zig/tokenizer.zig b/lib/std/zig/tokenizer.zig
index 7f9c6f628895885463d629b40148140218b5c02c..47c7d23b354de838347e8d65f95eb3e899517007 100644
--- a/lib/std/zig/tokenizer.zig
+++ b/lib/std/zig/tokenizer.zig
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2015-2020 Zig Contributors
+// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
+// The MIT license requires this copyright notice to be included in all copies
+// and substantial portions of the software.
 const std = @import("../std.zig");
 const mem = std.mem;
 
diff --git a/test/stack_traces.zig b/test/stack_traces.zig
index 616136b9ee749b06a57d3bc2e431ba158f33f0aa..2ab022e6ecc8b0daa8daa91f49c8831f6412937b 100644
--- a/test/stack_traces.zig
+++ b/test/stack_traces.zig
@@ -282,10 +282,10 @@ pub fn addCases(cases: *tests.StackTracesContext) void {
                     \\source.zig:10:8: [address] in main (test)
                     \\    foo();
                     \\       ^
-                    \\start.zig:249:29: [address] in std.start.posixCallMainAndExit (test)
+                    \\start.zig:254:29: [address] in std.start.posixCallMainAndExit (test)
                     \\            return root.main();
                     \\                            ^
-                    \\start.zig:123:5: [address] in std.start._start (test)
+                    \\start.zig:128:5: [address] in std.start._start (test)
                     \\    @call(.{ .modifier = .never_inline }, posixCallMainAndExit, .{});
                     \\    ^
                     \\
@@ -294,7 +294,7 @@ pub fn addCases(cases: *tests.StackTracesContext) void {
                 switch (std.Target.current.cpu.arch) {
                     .aarch64 => "", // TODO disabled; results in segfault
                     else => 
-                \\start.zig:123:5: [address] in std.start._start (test)
+                \\start.zig:128:5: [address] in std.start._start (test)
                     \\    @call(.{ .modifier = .never_inline }, posixCallMainAndExit, .{});
                     \\    ^
                     \\