[FFmpeg-devel] Re: [GASPP PATCH 1/2] Pass "-machine" options through to armasm

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

Hi,

On Fri, 7 Nov 2025, Harish Raja Selvan wrote:

> Just wanted to check if you have an estimate for when the ARM64EC related
> patches for gas-preprocessor

The patch for gas-preprocessor was merged already many weeks ago. (We 
agreed to go with my version of that patch.)

> and the makedef script changes might be upstreamed.

Rémi had concerns about this - not so much specifically about the makedef 
patch at hand, but about the overall premise of this.

We still haven't heard any concrete explanation on what your intended 
usecase is. We're aware of the general concept - but we'd want to 
understand which concrete way you intend for it to be used.

While the toolchain ensures ABI compatibility between x86_64 and arm64ec, 
that only holds up when actually compiling the exact same code across the 
two - but there are a number of arch specific ifdefs (ARCH_X86 vs 
ARCH_AARCH64) that do lead to a number of inconsistencies in the ABI 
surfaces of the libraries (that can be more or less subtle).

We are not willing to accept patches to the libraries themselves for 
tweaking such details (or anything else relating to arm64ec) - as that 
would potentially lead to a large extra maintainance burden. And we'd also 
like to make it clear that building in this configuration is entirely 
unsupported.

With the questions above answered, and the limitations above acknowledgd, 
the makedef patch could be acceptable to merge - if I correctly understood 
and summarized the discussion with Rémi.

// Martin
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