[llvm][Support] Use __NR_gettid on Linux for compat with older glibc

[brad0]

No description provided.

[llvmbot]

@llvm/pr-subscribers-llvm-support

Author: Brad Smith (brad0)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/120007.diff

1 Files Affected:

• (modified) llvm/lib/Support/Unix/Threading.inc (+1-1)

diff --git a/llvm/lib/Support/Unix/Threading.inc b/llvm/lib/Support/Unix/Threading.inc
index c7b4c7af3b9f33..aedcd9aa34b99a 100644
--- a/llvm/lib/Support/Unix/Threading.inc
+++ b/llvm/lib/Support/Unix/Threading.inc
@@ -141,7 +141,7 @@ uint64_t llvm::get_threadid() {
 #elif defined(__ANDROID__)
   return uint64_t(gettid());
 #elif defined(__linux__)
-  return uint64_t(syscall(SYS_gettid));
+  return uint64_t(syscall(__NR_gettid));
 #else
   return uint64_t(pthread_self());
 #endif