[FFmpeg-devel] [PATCH] fix(configure): fix detection on windows

[Martin Storsjö]

On Fri, 23 May 2025, Coia Prant wrote:

> On Windows Arm64
> `uname -m` returned `x86_64` instead of `aarch64`
> Link: https://github.com/msys2/msys2-runtime/issues/171
>
> On x86 32-bit toolchain msys2 environment
> `uname -m` returned `x86_64` instead of `i686` or `x86`
>
> So check MSYSTEM_CARCH on windows (for arm64 and i686)
>
> This problem also in VideoLAN/x264
> Link: https://code.videolan.org/videolan/x264/-/merge_requests/177
>
> Signed-off-by: Coia Prant <coiaprant at gmail.com>
> ---
> configure | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/configure b/configure
> index 2e69b3c..ed30b6b 100755
> --- a/configure
> +++ b/configure
> @@ -4157,6 +4157,8 @@ if test "$target_os_default" = aix; then
>     arch_default=$(uname -p)
>     strip_default="strip -X32_64"
>     nm_default="nm -g -X32_64"
> +elif test "$MSYSTEM_CARCH" != ""; then
> +    arch_default="$MSYSTEM_CARCH"
> else
>     arch_default=$(uname -m)
> fi
> -- 
> 2.49.0.windows.1

This approach seems reasonable to me.

(On i686 vs x86_64, it hasn't been an issue, since they all map into "x86" 
within ffmpeg, and configure then checks the bitness, but for arm64 it's 
indeed an issue.)

I can push the patch soon if nobody minds it.

// Martin