PR #23333 opened by Kacper Michajłow (kasper93) URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23333 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23333.patch
Win32 ABI only mandates 4 bytes stack alignment. GCC 16 changed default align and no longer works with ffmpeg expectations. Fixes crashes on aligned memory access in mingw32 gcc 16 build. Fixes: https://fate.ffmpeg.org/report.cgi?time=20260604120705&slot=msys2-mingw32 From cba4661e01ecbdeac95e743abb86dcd5249abaa8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Kacper=20Michaj=C5=82ow?= <[email protected]> Date: Thu, 4 Jun 2026 16:21:50 +0200 Subject: [PATCH] configure: set -mpreferred-stack-boundary=4 for Windows 32-bit targets MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Win32 ABI only mandates 4 bytes stack alignment. GCC 16 changed default align and no longer works with ffmpeg expectations. Fixes crashes on aligned memory access in mingw32 gcc 16 build. Signed-off-by: Kacper Michajłow <[email protected]> --- configure | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/configure b/configure index 7cf06d404e..79390ea2ff 100755 --- a/configure +++ b/configure @@ -8172,8 +8172,8 @@ elif enabled gcc; then enabled extra_warnings || check_disable_warning -Wno-maybe-uninitialized if enabled x86_32; then case $target_os in - *bsd*) - # BSDs don't guarantee a 16 byte aligned stack, but we can + *bsd*|mingw32|mingw64|win32|win64|cygwin*) + # These targets don't guarantee a 16 byte aligned stack, but we can # request GCC to try to maintain 16 byte alignment throughout # function calls. Library entry points that might call assembly # functions align the stack. (The parameter means 2^4 bytes.) -- 2.52.0 _______________________________________________ ffmpeg-devel mailing list -- [email protected] To unsubscribe send an email to [email protected]
