From 79837d51123460e4f0a04ba523d01b10f7c314cd Mon Sep 17 00:00:00 2001
From: Pavel Verigo <paul.verigo@gmail.com>
Date: Mon, 31 Aug 2026 21:12:09 +0200
Subject: [PATCH] incr-check: update timestamp on each update

---
 test/incremental/add_decl             |  1 -
 test/incremental/add_decl_namespaced  |  2 --
 test/incremental/change_enum_tag_type |  1 -
 tools/incr-check.zig                  | 20 +++++++++++++-------
 4 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/test/incremental/add_decl b/test/incremental/add_decl
index e280a1f49ccd161c821ce869e7922c125aa8f903..50d961da7b88f00b78b2895ebfeae18e76219d6a 100644
--- a/test/incremental/add_decl
+++ b/test/incremental/add_decl
@@ -1,4 +1,3 @@
-#skip_target=x86_64-linux-selfhosted
 #update=initial version
 #file=main.zig
 const std = @import("std");
diff --git a/test/incremental/add_decl_namespaced b/test/incremental/add_decl_namespaced
index 8ac1bb8021a8f23d1e6f2b4f52e3af0d58fb767c..e1fa74a3ad7ecd6bb70b481f73d6db0702c27d22 100644
--- a/test/incremental/add_decl_namespaced
+++ b/test/incremental/add_decl_namespaced
@@ -1,5 +1,3 @@
-#skip_target=wasm32-wasi-selfhosted
-#skip_target=x86_64-linux-selfhosted
 #update=initial version
 #file=main.zig
 const std = @import("std");
diff --git a/test/incremental/change_enum_tag_type b/test/incremental/change_enum_tag_type
index c329a1e71cc57aeb735b2874b0a31dfcaaa2d562..6ff8a1424d0c695145e7e136b9989c7413fda5a2 100644
--- a/test/incremental/change_enum_tag_type
+++ b/test/incremental/change_enum_tag_type
@@ -1,4 +1,3 @@
-#skip_target=wasm32-wasi-selfhosted
 #update=initial version
 #file=main.zig
 const Tag = u2;
diff --git a/tools/incr-check.zig b/tools/incr-check.zig
index 9b7dbf8aa323c21c3aa4254f48dd4331be9bfb83..49a2fae873d33b40a9eaf573fda416f6085840eb 100644
--- a/tools/incr-check.zig
+++ b/tools/incr-check.zig
@@ -241,6 +241,7 @@ pub fn main(init: std.process.Init) !void {
     multi_reader.init(gpa, io, multi_reader_buffer.toStreams(), &.{ child.stdout.?, child.stderr.? });
     defer multi_reader.deinit();
 
+    var update_mtime = Io.Clock.real.now(io);
     for (case.updates) |update| {
         var update_prog_node = updates_prog_node.start(update.name, 0);
         defer update_prog_node.end();
@@ -253,7 +254,8 @@ pub fn main(init: std.process.Init) !void {
         log_cur_update = &update;
         defer log_cur_update = null;
 
-        eval.write(update);
+        eval.write(update, update_mtime);
+        update_mtime = update_mtime.addDuration(.fromSeconds(5));
         try eval.requestUpdate();
         try eval.check(&multi_reader, update, update_prog_node);
     }
@@ -286,14 +288,18 @@ const Eval = struct {
     enable_darling: bool,
 
     /// Currently this function assumes the previous updates have already been written.
-    fn write(eval: *Eval, update: Case.Update) void {
+    fn write(eval: *Eval, update: Case.Update, mtime: Io.Timestamp) void {
         const io = eval.io;
         for (update.changes) |full_contents| {
-            eval.tmp_dir.writeFile(io, .{
-                .sub_path = full_contents.name,
-                .data = full_contents.bytes,
-            }) catch |err| {
-                eval.fatal("failed to update '{s}': {t}", .{ full_contents.name, err });
+            var update_file = eval.tmp_dir.createFile(io, full_contents.name, .{}) catch |err| {
+                eval.fatal("failed to create update '{s}': {t}", .{ full_contents.name, err });
+            };
+            defer update_file.close(io);
+            update_file.writeStreamingAll(io, full_contents.bytes) catch |err| {
+                eval.fatal("failed to write update '{s}': {t}", .{ full_contents.name, err });
+            };
+            update_file.setTimestamps(io, .{ .modify_timestamp = .{ .new = mtime } }) catch |err| {
+                eval.fatal("failed to set mtime for '{s}': {t}", .{ full_contents.name, err });
             };
         }
         for (update.deletes) |doomed_name| {
-- 
2.54.0