1 files changed, 9 insertions, 1 deletions
diff --git a/contrib/compiler-rt/lib/builtins/atomic_flag_clear_explicit.c b/contrib/compiler-rt/lib/builtins/atomic_flag_clear_explicit.c
index 0f7859c2cd82..1059b787f169 100644
--- a/contrib/compiler-rt/lib/builtins/atomic_flag_clear_explicit.c
+++ b/contrib/compiler-rt/lib/builtins/atomic_flag_clear_explicit.c
@@ -12,9 +12,17 @@
  *===------------------------------------------------------------------------===
  */
 
+#ifndef __has_include
+#define __has_include(inc) 0
+#endif
+
+#if __has_include(<stdatomic.h>)
+
 #include <stdatomic.h>
 #undef atomic_flag_clear_explicit
 void atomic_flag_clear_explicit(volatile atomic_flag *object,
                                 memory_order order) {
-  return __c11_atomic_store(&(object)->_Value, 0, order);
+  __c11_atomic_store(&(object)->_Value, 0, order);
 }
+
+#endif