From f8372d030e50b6eec50fd21a387b4d875f81a178 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Fri, 6 Dec 2024 14:00:49 +0100
Subject: [PATCH] compiler: Classify libatomic as an alias for compiler-rt.

This is a library that ships with GCC and provides fallback implementations of
atomic intrinsics where necessary. Since we do the same in our compiler-rt
implementation, and since some build systems insist on passing -latomic even
for Clang (which zig cc masquerades as), just satisfy this dependency by way of
compiler-rt.

Closes #22165.
---
 src/target.zig | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/target.zig b/src/target.zig
index 6297d21bfc..ae3a8e7ecc 100644
--- a/src/target.zig
+++ b/src/target.zig
@@ -267,7 +267,9 @@ pub fn classifyCompilerRtLibName(target: std.Target, name: []const u8) CompilerR
         // the linker unable to find `_Unwind_RaiseException` and other related symbols.
         return .both;
     }
-    if (std.mem.eql(u8, name, "compiler_rt")) {
+    if (std.mem.eql(u8, name, "compiler_rt") or
+        std.mem.eql(u8, name, "atomic"))
+    {
         return .only_compiler_rt;
     }
     if (std.mem.eql(u8, name, "unwind")) {