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List:       fedora-devel-list
Subject:    Re: SIMD-related package amd minimum supported instructions
From:       Fabio Valentini <decathorpe () gmail ! com>
Date:       2021-04-16 17:10:07
Message-ID: CAB-QmhQso324fGkmNtybkp0uQ9qWhxr8NP1Nam1Zdqd6b2SQVA () mail ! gmail ! com
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On Fri, Apr 16, 2021 at 6:29 PM Robert-André Mauchin <zebob.m@gmail.com> wrote:
>
> Hello,
>
> I have a dependency that is a C++ library for SIMD (called highway).
> This library requires SSE4 as its minimum required instruction set
> ("Supported targets: SSE4, AVX2, AVX-512, NEON (ARMv7 and v8), WASM
> SIMD."). However the minimum for Fedora is SSE2. Am I still allowed to
> package this despite the requirement being above what's minimum for
> Fedora? It won't compile on old systems but building works fine in Koji.
>
> Best regards,
>
> Robert-André

Relevant FESCo discussion and decision:
https://pagure.io/fesco/issue/2569#comment-713002

The text that was voted on:

    Libraries packaged in Fedora may require ISA extensions, however
any packaged application must not crash on any officially supported
architecture, either by providing a generic fallback implementation OR
by cleanly exiting when the requisite hardware support is unavailable.

It is still stuck in the pipeline to get the packaging guidelines
changed, though:
https://pagure.io/packaging-committee/issue/1044

Hope that helps.
Fabio
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