[libcxx] make LIBCXXABI_PTHREAD_LIB_NAME configurable

[thewtex]

Alternative is "wasi-emulated-pthread".

[github-actions]

Thank you for submitting a Pull Request (PR) to the LLVM Project!

This PR will be automatically labeled and the relevant teams will be notified.

If you wish to, you can add reviewers by using the "Reviewers" section on this page.

If this is not working for you, it is probably because you do not have write permissions for the repository. In which case you can instead tag reviewers by name in a comment by using @ followed by their GitHub username.

If you have received no comments on your PR for a week, you can request a review by "ping"ing the PR by adding a comment “Ping”. The common courtesy "ping" rate is once a week. Please remember that you are asking for valuable time from other developers.

If you have further questions, they may be answered by the LLVM GitHub User Guide.

You can also ask questions in a comment on this PR, on the LLVM Discord or on the forums.

[llvmbot]

@llvm/pr-subscribers-libcxxabi

Author: Matt McCormick (thewtex)

Changes

Alternative is "wasi-emulated-pthread".

---

Full diff: https://github.com/llvm/llvm-project/pull/126609.diff

1 Files Affected:

• (modified) libcxxabi/src/CMakeLists.txt (+2-1)

diff --git a/libcxxabi/src/CMakeLists.txt b/libcxxabi/src/CMakeLists.txt
index 0a6fc892a4f6993..4bc8884e07b8ee6 100644
--- a/libcxxabi/src/CMakeLists.txt
+++ b/libcxxabi/src/CMakeLists.txt
@@ -69,7 +69,8 @@ endif()
 
 if (NOT APPLE) # On Apple platforms, we always use -nostdlib++ so we don't need to re-add other libraries
   if (LIBCXXABI_ENABLE_THREADS)
-    add_library_flags_if(LIBCXXABI_HAS_PTHREAD_LIB pthread)
+    set(LIBCXXABI_PTHREAD_LIB_NAME "pthread" CACHE STRING "")
+    add_library_flags_if(LIBCXXABI_HAS_PTHREAD_LIB ${LIBCXXABI_PTHREAD_LIB_NAME})
   endif()
 
   add_library_flags_if(LIBCXXABI_HAS_C_LIB c)