release/19.x: Fix libFuzzer not building with pthreads on Windows (#109525)

[llvmbot]

Backport b4130be

Requested by: @mstorsjo

[llvmbot]

@mstorsjo What do you think about merging this PR to the release branch?

[llvmbot]

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: None (llvmbot)

Changes

Backport b4130be

Requested by: @mstorsjo

---

Full diff: https://github.com/llvm/llvm-project/pull/110663.diff

1 Files Affected:

• (modified) compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp (+5)

diff --git a/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp b/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp
index db80eb383885e6..73eea07cf869ff 100644
--- a/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp
+++ b/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp
@@ -239,6 +239,10 @@ size_t PageSize() {
 }
 
 void SetThreadName(std::thread &thread, const std::string &name) {
+#if defined(_LIBCPP_HAS_THREAD_API_PTHREAD) ||                                 \
+    defined(_GLIBCXX_GCC_GTHR_POSIX_H)
+  (void)pthread_setname_np(thread.native_handle(), name.c_str());
+#else
   typedef HRESULT(WINAPI * proc)(HANDLE, PCWSTR);
   HMODULE kbase = GetModuleHandleA("KernelBase.dll");
   proc ThreadNameProc =
@@ -253,6 +257,7 @@ void SetThreadName(std::thread &thread, const std::string &name) {
       }
     }
   }
+#endif
 }
 
 } // namespace fuzzer

[mstorsjo]

@mstorsjo What do you think about merging this PR to the release branch?

LGTM, the commit has been in main for a couple of weeks, and my nightly builds run fine with it.

[github-actions]

@mstorsjo (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR.