Hello,
I now have a series of patches (~40) that implement most the missing
bits for C23 support. Nothing is very deep, here, I think, but
probably that is still quite a chunk to review. They are compile
tested for gcc version 7 to 12 and clang versions 9 to 17, but only on
x86_64.

Shall I sent them all here (I would have to refresh my git skills for
that) or does somebody want to browse on some sort of gitlab host
first?

When implementing this I also marginally updated my page describing
C23 library changes

     https://gustedt.gitlabpages.inria.fr/c23-library/

Jₑₙₛ

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