__attribute__((aligned)) don't work for stack variables in threads created with _beginthreadex without alignment.
Signed-off-by: Aleksey Vasenev <margtu-f...@ya.ru> --- send it again github: https://github.com/Ratio2/mingw-w64/tree/align fix crash: ffmpeg -f lavfi -i testsrc -vcodec libvpx -threads 2 -f null - problem discuss: https://ffmpeg.zeranoe.com/forum/viewtopic.php?t=2236 _beginthreadex does not align the stack on 16-byte boundary as expected by gcc. On x86 targets, the force_align_arg_pointer attribute may be applied to individual function definitions, generating an alternate prologue and epilogue that realigns the run-time stack if necessary. This supports mixing legacy codes that run with a 4-byte aligned stack with modern codes that keep a 16-byte stack for SSE compatibility. https://gcc.gnu.org/onlinedocs/gcc/x86-Function-Attributes.html mingw-w64-libraries/winpthreads/src/thread.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mingw-w64-libraries/winpthreads/src/thread.c b/mingw-w64-libraries/winpthreads/src/thread.c index 565ea48..c771daf 100644 --- a/mingw-w64-libraries/winpthreads/src/thread.c +++ b/mingw-w64-libraries/winpthreads/src/thread.c @@ -1454,6 +1454,9 @@ pthread_setcanceltype (int type, int *oldtype) return 0; } +#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2) +__attribute__((force_align_arg_pointer)) +#endif int pthread_create_wrapper (void *args) { -- 2.9.1 ------------------------------------------------------------------------------ _______________________________________________ Mingw-w64-public mailing list Mingw-w64-public@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
