[clang] [compiler-rt] [Sanitizers] the access size (8 bytes) exceeds the max lock-free size (4 bytes) for 32-bit (PR #125388)

[Hubert Tong via cfe-commits]

================
@@ -338,6 +338,13 @@ void aix::Linker::ConstructJob(Compilation &C, const 
JobAction &JA,
     CmdArgs.push_back("-lpthread");
   }
   const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
+    
+// Required for 64-bit atomic operations used in sanitizer runtimes 
+// (e.g., sanitizer_common's atomic utilities). On 32-bit AIX, these 
+// are not natively supported, necessitating linkage with -latomic.
+  if (Sanitize.hasAnySanitizer() && IsArch32Bit) {
+    CmdArgs.push_back("-latomic");
----------------
hubert-reinterpretcast wrote:

re: https://github.com/llvm/llvm-project/pull/125388/files#r1945365070:

> By keeping it in AIX.cpp, we maintain a clear separation between 
> platform-specific behavior and the more general sanitizer runtime dependency 
> logic.

In this case, the actual result would have been unintentional platform-specific 
behaviour.

https://github.com/llvm/llvm-project/pull/125388
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