[PATCH] Raise the minimum GCC version to 12.1 [BZ #32539]

[Carlos O'Donell]

On 2/11/25 11:53 PM, H.J. Lu wrote:
> For all Linux distros with glibc 2.40 which I can find, GCC 14.2 is used
> to compile glibc 2.40:
> 
> OS                    GCC      URL
> AOSC                  14.2.0   https://aosc.io/
> Arch Linux            14.2.0   https://archlinux.org/
> ArchPOWER             14.2.0   https://archlinuxpower.org/
> Artix                 14.2.0   https://artixlinux.org/
> Debian                14.2.0   https://www.debian.org/
> Devuan                14.2.0   https://www.devuan.org/
> Exherbo               14.2.0   https://www.exherbolinux.org/
> Fedora                14.2.1   https://fedoraproject.org/
> Gentoo                14.2.1   https://gentoo.org/
> Kali Linux            14.2.0   https://www.kali.org/
> KaOS                  14.2.0   https://kaosx.us/
> LiGurOS               14.2.0   https://liguros.gitlab.io/
> Mageia                14.2.0   https://www.mageia.org/en/
> Manjaro               14.2.0   https://manjaro.org/
> NixOS                 14.2.0   https://nixos.org/
> openmamba             14.2.0   https://openmamba.org/
> OpenMandriva          14.2.0   https://openmandriva.org/
> openSUSE              14.2.0   https://www.opensuse.org/
> Parabola              14.2.0   https://www.parabola.nu/
> PLD Linux             14.2.0   https://pld-linux.org/
> PureOS                14.2.0   https://pureos.net/
> Raspbian              14.2.0   http://raspbian.org/
> Slackware             14.2.0   http://www.slackware.com/
> Solus                 14.2.0   https://getsol.us/
> T2 SDE                14.2.0   http://t2sde.org/
> Ubuntu                14.2.0   https://www.ubuntu.com/
> Wikidata              14.2.0   https://wikidata.org/
> 
> Support older versions of GCC to build glibc 2.42:
> 
> 1. Need to work around bugs in older versions of GCC.
> 2. Can't use the new features in newer versions of GCC, which may be
> required for new features, like _Float16 which requires GCC 12.1 or
> above, in glibc,
> 
> The main benefit of supporting older versions of GCC is easier backport
> of bug fixes to the older releases of glibc, which can be mitigated by
> avoiding incompatible features in newer versions of GCC for critical bug
> fixes.  Require GCC 12.1 or newer to build.  Remove GCC version check for
> PowerPC and s390x.
> 
> TEST_CC and TEST_CXX can be used to test the glibc build with the older
> versions of GCC.
> 
> For glibc developers who are using Linux OSes which don't come with GCC
> 12.1 or newer, they should build and install GCC 12.1 or newer to work
> on glibc.
> 
> This fixes BZ #32539.
> 
> Signed-off-by: H.J. Lu <hjl.tools@gmail.com>

This is great work and the one blocker we have here is that all pre-commit CI should
be updated to pass after this commit.

We have ensured that the Red Hat pre-commit CI is using a new enough compiler since
we pull and build the latest stable release Fedora container.

Adhemerval, Do you have any status you can share about the Linaro pre-commit CI
builder upgrades? I think those upgrades would provide a new enough compiler.

-- 
Cheers,
Carlos.