[Openmp-commits] [openmp] Fix: Add missing preprocessor guard for hwloc types on macOS (PR #156708)

[Burhan Söğüt via Openmp-commits]

https://github.com/bursow created https://github.com/llvm/llvm-project/pull/156708

Fix #156679
The issue stems from the __kmp_is_hwloc_membind_supported function in openmp/runtime/src/kmp_alloc.cpp. The function uses a type from the hwloc library (hwloc_membind_policy_t), but it was only guarded by #if KMP_USE_HWLOC. On macOS, KMP_AFFINITY_SUPPORTED is not defined, so the necessary header file (hwloc.h) isn't included, leading to an unknown type error.

The fix is to update the preprocessor guard to #if KMP_USE_HWLOC && KMP_AFFINITY_SUPPORTED, ensuring the function is only compiled when the hwloc type is available. 

>From c9d9557d59cec1c053df5ee10190fe1436291dfe Mon Sep 17 00:00:00 2001
From: Burhan <segabur at hotmail.com>
Date: Wed, 3 Sep 2025 19:10:12 +0300
Subject: [PATCH] Fix: Add missing preprocessor guard for hwloc types on macOS

---
 openmp/runtime/src/kmp_alloc.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/openmp/runtime/src/kmp_alloc.cpp b/openmp/runtime/src/kmp_alloc.cpp
index 051f88c5a0996..b608d1985878b 100644
--- a/openmp/runtime/src/kmp_alloc.cpp
+++ b/openmp/runtime/src/kmp_alloc.cpp
@@ -1545,7 +1545,7 @@ void __kmp_fini_memkind() {
 #endif
 }
 
-#if KMP_USE_HWLOC
+#if KMP_USE_HWLOC && KMP_AFFINITY_SUPPORTED
 static bool __kmp_is_hwloc_membind_supported(hwloc_membind_policy_t policy) {
 #if HWLOC_API_VERSION >= 0x00020300
   const hwloc_topology_support *support;
@@ -1563,6 +1563,7 @@ static bool __kmp_is_hwloc_membind_supported(hwloc_membind_policy_t policy) {
   return false;
 #endif
 }
+#endif
 
 void *__kmp_hwloc_alloc_membind(hwloc_memattr_id_e attr, size_t size,
                                 hwloc_membind_policy_t policy) {