From ddc815e3d88d32b8f3df0610ee59c8d34b8ff8eb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Sun, 5 Oct 2025 16:59:05 +0200
Subject: [PATCH] drop support for powerpc64 ELF v1

* ELF v1 on powerpc64 is only barely kept on life support in a couple of Linux
  distros. I don't anticipate that this will last much longer.
* Most of the Linux world has moved to powerpc64le which requires ELF v2.
* Some Linux distros have even started supporting powerpc64 with ELF v2.
* The BSD world has long since moved to ELF v2.
* We have no actual linking support for ELF v1.
* ELF v1 had confused DWARF register mappings which is becoming a problem in
  our DWARF code in std.debug.

It's clear that ELF v1 is on its way out, and we never fully supported it
anyway. So let's not waste any time or energy on it going forward.

closes #5927
---
 lib/std/Target.zig |  6 +++---
 src/target.zig     | 18 +-----------------
 test/tests.zig     |  2 +-
 3 files changed, 5 insertions(+), 21 deletions(-)

diff --git a/lib/std/Target.zig b/lib/std/Target.zig
index 5b16b07c8baac4058269c9b93406d9e3bc91a14a..3fb9587c82b37bb9123e833b2ba4fced807a594d 100644
--- a/lib/std/Target.zig
+++ b/lib/std/Target.zig
@@ -2463,9 +2463,9 @@ pub const DynamicLinker = struct {
                         => init("/lib/ld.so.1"),
                         else => none,
                     },
-                    // TODO: ELFv2 ABI (`/lib64/ld64.so.2`) opt-in support.
-                    .powerpc64 => if (abi == .gnu) init("/lib64/ld64.so.1") else none,
-                    .powerpc64le => if (abi == .gnu) init("/lib64/ld64.so.2") else none,
+                    .powerpc64,
+                    .powerpc64le,
+                    => if (abi == .gnu) init("/lib64/ld64.so.2") else none,
 
                     .riscv32,
                     .riscv64,
diff --git a/src/target.zig b/src/target.zig
index e67cf901f28b1940ca7a2be26ce955ebdb3a4738..2cc40ca3588c274d6b44c271cc818045582908a5 100644
--- a/src/target.zig
+++ b/src/target.zig
@@ -631,14 +631,6 @@ pub fn isDynamicAMDGCNFeature(target: *const std.Target, feature: std.Target.Cpu
 }
 
 pub fn llvmMachineAbi(target: *const std.Target) ?[:0]const u8 {
-    // LLD does not support ELFv1. Rather than having LLVM produce ELFv1 code and then linking it
-    // into a broken ELFv2 binary, just force LLVM to use ELFv2 as well. This will break when glibc
-    // is linked as glibc only supports ELFv2 for little endian, but there's nothing we can do about
-    // that. With this hack, `powerpc64-linux-none` will at least work.
-    //
-    // Once our self-hosted linker can handle both ABIs, this hack should go away.
-    if (target.cpu.arch == .powerpc64) return "elfv2";
-
     return switch (target.cpu.arch) {
         .arm, .armeb, .thumb, .thumbeb => "aapcs",
         .loongarch64 => switch (target.abi) {
@@ -656,15 +648,7 @@ pub fn llvmMachineAbi(target: *const std.Target) ?[:0]const u8 {
             .gnuabin32, .muslabin32 => "n32",
             else => "n64",
         },
-        .powerpc64 => switch (target.os.tag) {
-            .freebsd => if (target.os.version_range.semver.isAtLeast(.{ .major = 13, .minor = 0, .patch = 0 }) orelse false)
-                "elfv2"
-            else
-                "elfv1",
-            .openbsd => "elfv2",
-            else => if (target.abi.isMusl()) "elfv2" else "elfv1",
-        },
-        .powerpc64le => "elfv2",
+        .powerpc64, .powerpc64le => "elfv2", // We do not support ELFv1.
         .riscv64, .riscv64be => if (target.cpu.has(.riscv, .e))
             "lp64e"
         else if (target.cpu.has(.riscv, .d))
diff --git a/test/tests.zig b/test/tests.zig
index 8e46fece21c30feedf3faa295d34ab281f38bf65..fb449d5bf4c8347e6d972e9e66dd752ef71a2220 100644
--- a/test/tests.zig
+++ b/test/tests.zig
@@ -801,7 +801,7 @@ const test_targets = blk: {
             .link_libc = true,
             .extra_target = true,
         },
-        // Requires ELFv1 linker support.
+        // glibc's build-many-glibcs.py currently only builds this target for ELFv1.
         // .{
         //     .target = .{
         //         .cpu_arch = .powerpc64,
-- 
2.54.0