[FFmpeg-devel] Re: [DISCUSSION] Adding ARM64EC support to FFmpeg

["Martin Storsjö via ffmpeg-devel" <ffmpeg-devel@ffmpeg.org>]

On Tue, 23 Sep 2025, Harish Raja Selvan wrote:

> Following up on the discussion above on ARM64EC support, I’ve prepared a
> patch to
> update gas-preprocessor.pl that enables FFmpeg to be compiled for ARM64EC
> target on Windows. This change ensures that -m flags are not eliminated for
> ARM64EC target, allowing assembly files to preprocess as expected. This
> avoids build failures.

It is entirely unclear to me what -m flags you would expect to be seeing 
here. I can understand the part of the patch to filter out the flag 
-arm64EC, but I don't see where a flag "ARM64EC" would come from for 
preprocess_c_cd, or where any -m flags would come from.

To make sense of the patch, I would suggest you at least explain what kind 
of configure flags you are using in combination with these patches.

My attempts with ARM64EC with MSVC are configured with --arch=arm64 
--target-os=win32 --toolchain=msvc --extra-cflags="-arm64EC" 
--extra-ldflags="-machine:arm64ec". I guess you are doing something other 
than that, if you're getting -m flags somewhere.

Ideally, post both your build system patches and the gas-preprocessor 
patch at the same time.

Also, don't top post.

// Martin
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