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Would it be possible to backport this upstream commit?

Without it, recent bison built on ppc64le will not run on glibc 2.34 because undefined weak symbols get corrupted during dynamic linking (and gnulib contains such symbols for libpthread references).

commit b293661219c36e72acb80502a86b51160bb88cfd
Author: Alan Modra <amodra>
Date:   Mon May 3 10:03:06 2021 +0930

    PPC: ensure_undef_dynamic on weak undef only in plt
    
    It's slightly weird to have a call to a weak function not protected by
    a test of that function being non-NULL, but the non-NULL test might be
    covered by a test of another function.  For example:
      if (func1)
        {
          func1 ();
          func2 ();
        }
    where func2 is known to exist if func1 exists.
    
            * elf32-ppc.c (allocate_dynrelocs): Call ensure_undef_dynamic for
            weak undefined symols that only appear on PLT relocs.
            * elf64-ppc.c (allocate_dynrelocs): Likewise.


It would be nice to backport this soon, so that we can rebuild affected packages with the new binutils.

Fixed in binutils-2.35.2-4.el9_0_0