[compiler-rt] Fix libFuzzer not building with pthreads on Windows (PR #109525)

[via llvm-commits]

https://github.com/Zentrik created https://github.com/llvm/llvm-project/pull/109525

Fixes https://github.com/llvm/llvm-project/issues/106871

>From 0c1067433727a18d37aa49620e564ab68e646d62 Mon Sep 17 00:00:00 2001
From: Zentrik <llvm.zentrik at gmail.com>
Date: Sat, 21 Sep 2024 10:10:29 +0100
Subject: [PATCH] Fix libFuzzer not building with pthreads on Windows

Fixes https://github.com/llvm/llvm-project/issues/106871
---
 compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp b/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp
index e0210aa0ac3651..ca0a2a9f958caa 100644
--- a/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp
+++ b/compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp
@@ -239,6 +239,9 @@ 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 = reinterpret_cast<proc>(
@@ -253,6 +256,7 @@ void SetThreadName(std::thread &thread, const std::string &name) {
       }
     }
   }
+#endif
 }
 
 } // namespace fuzzer