From 407ac22322e5ce67996ec54ef619cafa4c9ceb78 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Wed, 28 Oct 2015 22:20:43 +0200
Subject: [PATCH] w32pthreads: Map MemoryBarrier to __sync_synchronize on mingw
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This fixes building on older mingw (both mingw.org and mingw64;
mingw64 from before May 2011).

Signed-off-by: Martin Storsjö <martin@martin.st>
---
 compat/w32pthreads.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/compat/w32pthreads.h b/compat/w32pthreads.h
index 3bc69b31cb..2fe2a5ab97 100644
--- a/compat/w32pthreads.h
+++ b/compat/w32pthreads.h
@@ -39,9 +39,9 @@
 #include <windows.h>
 #include <process.h>
 
-/* MinGW requires the intrinsics header for the pthread_once fallback code */
 #if _WIN32_WINNT < 0x0600 && defined(__MINGW32__)
-#include <intrin.h>
+#undef MemoryBarrier
+#define MemoryBarrier __sync_synchronize
 #endif
 
 #include "libavutil/attributes.h"