Re: SIMD-related package amd minimum supported instructions

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On 4/16/21 7:10 PM, Fabio Valentini wrote:
On Fri, Apr 16, 2021 at 6:29 PM Robert-André Mauchin <zebob.m@xxxxxxxxx> 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


What if the problematic binary is just a test program used during build and not shipped in the final package? It works on Koji and don't cause any problem there and won't be a problem at all since the resulting package is a headers only library.

Thanks,

Robert-André
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