[clang] 8f8590e - [OpenMP][AIX] Add libpthreads for -fopenmp (#184629)

[via cfe-commits]

Author: Xing Xue
Date: 2026-03-04T11:22:49-05:00
New Revision: 8f8590e691fe772b321004118ae92f5230c8a94d

URL: https://github.com/llvm/llvm-project/commit/8f8590e691fe772b321004118ae92f5230c8a94d
DIFF: https://github.com/llvm/llvm-project/commit/8f8590e691fe772b321004118ae92f5230c8a94d.diff

LOG: [OpenMP][AIX] Add libpthreads for -fopenmp (#184629)

The compiler uses TLS for OpenMP thread‑private data, which results in
references to symbols such as `__tls_get_addr` in `libpthreads`.
Therefore, this PR adds `libpthreads` to the link command when
`-fopenmp` is specified.

Added: 
    

Modified: 
    clang/lib/Driver/ToolChains/AIX.cpp

Removed: 
    


################################################################################
diff  --git a/clang/lib/Driver/ToolChains/AIX.cpp b/clang/lib/Driver/ToolChains/AIX.cpp
index 2078ad57aee18..e7f4792ac5bba 100644
--- a/clang/lib/Driver/ToolChains/AIX.cpp
+++ b/clang/lib/Driver/ToolChains/AIX.cpp
@@ -310,6 +310,8 @@ void aix::Linker::ConstructJob(Compilation &C, const JobAction &JA,
           // Already diagnosed.
           break;
         }
+        // libpthreads is required for -fopenmp.
+        CmdArgs.push_back("-lpthreads");
       }
 
       // Support POSIX threads if "-pthreads" or "-pthread" is present.