Making _Noreturn a no-op in < Clang 16?

[Sam James]

Hi all,

Over on bug-gawk, we ended up finding that Clang was miscompiling certain
expressions involving _Noreturn. This is fixed in Clang's git repo but not
in any released version. It should be in 16.0.

Paul suggested [0] that gnulib ought to #define _Noreturn to blank
for known-broken Clang versions, especially given finding such
broken patterns isn't easy.

This seems like a reasonable path forward. I'm concerned about
gnulib versions in various released bits of GNU software (diffutils
just got a release, for example) without this workaround in.

What do you think?

[0] https://lists.gnu.org/archive/html/bug-gawk/2023-01/msg00004.html

Best,
sam

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