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  1. RHEL
  2. RHEL-31744

glibc: Drop FMA4 function variants from build

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    • rhel-10.0.beta
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    • Red Hat Enterprise Linux
    • x86_64

      RHEL 10 does not support CPUs that have only FMA4 support. We should backport this upstream commit:

      commit 9f78a7c1d0963282608da836b840f0d5ae1c478e
Author: Sunil K Pandey <skpgkp2@gmail.com>
Date:   Tue Feb 13 12:23:14 2024 -0800

    x86_64: Exclude SSE, AVX and FMA4 variants in libm multiarch
    
    When glibc is built with ISA level 3 or higher by default, the resulting
    glibc binaries won't run on SSE or FMA4 processors.  Exclude SSE, AVX and
    FMA4 variants in libm multiarch when ISA level 3 or higher is enabled by
    default.
    
    When glibc is built with ISA level 2 enabled by default, only keep SSE4.1
    variant.
    
    Fixes BZ 31335.
    
    NB: elf/tst-valgrind-smoke test fails with ISA level 4, because valgrind
    doesn't support AVX512 instructions:
    
    https://bugs.kde.org/show_bug.cgi?id=383010
    
    Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

            glibc-bugzilla Platform Tools - Libraries Bot
            fweimer@redhat.com Florian Weimer
            Platform Tools - Libraries Bot Platform Tools - Libraries Bot
            qe-baseos-tools-bugs@redhat.com qe-baseos-tools-bugs@redhat.com qe-baseos-tools-bugs@redhat.com qe-baseos-tools-bugs@redhat.com
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              Created:
              Updated: