OS X, add OSMemoryBarrier() for memory_barrier() portability.

Builds fine, untested.

1 files changed, 6 insertions, 0 deletions

diff --git a/compiler.h b/compiler.h
index b6919aaa..bca4c9e2 100644
--- a/compiler.h
+++ b/compiler.h
@@ -54,12 +54,18 @@ typedef unsigned int speed_t;
 #endif /* HAVE_STDATOMIC_H */
 #endif /* S_SPLINT_S */
 
+#ifdef HAVE_OSATOMIC_H
+#include <libkern/OSAtomic.h>
+#endif /* HAVE_STDATOMIC_H */
+
 static /*@unused@*/ inline void memory_barrier(void)
 /* prevent instruction reordering across any call to this function */
 {
 #ifndef S_SPLINT_S
 #ifdef STD_ATOMIC_H
     atomic_thread_fence(memory_order_seq_cst);
+#elif defined(HAVE_OSATOMIC_H)
+    OSMemoryBarrier();
 #elif defined(__GNUC__)
     asm volatile ("" : : : "memory");
 #endif /* STD_ATOMIC_H */