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Bug#1080475: marked as done (mesa: please re-enable softpipe, at least on architectures where llvmpipe is not yet mature)

Your message dated Thu, 05 Sep 2024 09:21:07 +0000
with message-id <E1sm8fr-006WM7-OL@fasolo.debian.org>
and subject line Bug#1080475: fixed in mesa 24.2.1-4
has caused the Debian Bug report #1080475,
regarding mesa: please re-enable softpipe, at least on architectures where llvmpipe is not yet mature
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
1080475: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1080475
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Source: mesa
Severity: important
Justification: causes FTBFS in at least src:gtk4
Tags: ftbfs
X-Debbugs-Cc: gtk4@packages.debian.org, debian-riscv@packages.debian.org, debian-loongarch@packages.debian.org, debian-mips@packages.debian.org
User: debian-mips@packages.debian.org
Usertags: mips64el
User: debian-riscv@packages.debian.org
Usertags: riscv64

Historically, Mesa's llvmpipe used LLVM MCJIT, which supports a limited
range of architectures and will not add more, and this resulted in
several architectures having either a broken llvmpipe or no llvmpipe
support at all.

With the recent upload of Mesa 24.2.x to unstable, llvmpipe now uses
ORCJIT for architectures where MCJIT is unavailable. However, the ORCJIT
version of llvmpipe doesn't seem to be particularly mature yet (perhaps
unsurprisingly, it's very new!) and is crashing under some circumstances
on at least riscv64: #1080435.

If softpipe was still enabled on at least the affected architectures,
then packages' test suites would be able to force its use via
GALLIUM_DRIVER=softpipe in the environment if necessary. At the
moment src:gtk4 does this on mips*, plus the powerpc and sparc* -ports
architectures, to avoid #1010838; the removal of the softpipe driver
means that this makes GL initialization fail, causing test failures and
a FTBFS (I'll report this as a separate RC bug in src:gtk4). I had hoped
to do the same for riscv64 to work around #1080435, but in fact this is
not possible for the same reason.

While it's more important on the ORCJIT architectures, also enabling
softpipe on more mainstream architectures like x86 would make it easier
for maintainers to compare llvmpipe with softpipe (without having to
build their package on porterboxes that are often very slow), and easier
to get a consistent test result for all architectures.

For what it's worth, the upstream default (with -Dgallium-drivers=auto)
is to enable softpipe on all architectures. In the Debian
packaging, I believe this would be most easily done by reverting
1ba4b2499e875266f6fbd7ba20068fb569986286 "rules: Build softpipe or
llvmpipe depending on the arch, not both.".

Thanks,
    smcv

--- End Message ---
--- Begin Message --- 
Source: mesa
Source-Version: 24.2.1-4
Done: Timo Aaltonen <tjaalton@debian.org>

We believe that the bug you reported is fixed in the latest version of
mesa, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1080475@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Timo Aaltonen <tjaalton@debian.org> (supplier of updated mesa package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Format: 1.8
Date: Thu, 05 Sep 2024 11:49:34 +0300
Source: mesa
Built-For-Profiles: noudeb
Architecture: source
Version: 24.2.1-4
Distribution: unstable
Urgency: medium
Maintainer: Debian X Strike Force <debian-x@lists.debian.org>
Changed-By: Timo Aaltonen <tjaalton@debian.org>
Closes: 1080475
Changes:
 mesa (24.2.1-4) unstable; urgency=medium
 .
   * patches: Add patches to fix autopkgtest regressions in dril.
   * rules: Enable softpipe everywhere again. (Closes: #1080475)
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