Move the FORCE_ALIGN macro to threads.h

1 files changed, 10 insertions, 0 deletions

diff --git a/common/threads.h b/common/threads.h
index c2848ee7..87b8a6f5 100644
--- a/common/threads.h
+++ b/common/threads.h
@@ -3,6 +3,16 @@
 
 #include <time.h>
 
+#if defined(__GNUC__) && defined(__i386__)
+/* force_align_arg_pointer is required for proper function arguments aligning
+ * when SSE code is used. Some systems (Windows, QNX) do not guarantee our
+ * thread functions will be properly aligned on the stack, even though GCC may
+ * generate code with the assumption that it is. */
+#define FORCE_ALIGN __attribute__((force_align_arg_pointer))
+#else
+#define FORCE_ALIGN
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif