bug#72036: 31.0.50; master doesn't build on macOS with clang 18

[Pip Cet]

(CC'ing Paul Eggert and Jim Meyering, the relevant gnulib maintainers).

On Wednesday, July 10th, 2024 at 14:09, Gerd Möllmann 
<gerd.moellmann@gmail.com> wrote:
> master, HEAD a29a385ee5ea938ed17d94622c7bfd0a10e84830
> 
> timespec-sub.c:38:12: error: operand argument to checked integer operation 
> must be an integer type
> other than plain 'char', 'bool', bit-precise, or an enumeration ('bool' 
> invalid)
> 38 | if (v == ckd_sub (&rs, rs, borrow))
>    |          ^~~~~~~~~~~~~~~~~~~~~~~~~
> /opt/homebrew/Cellar/llvm/18.1.8/lib/clang/18/include/stdckdint.h:38:54: 
> note: expanded from macro
> 'ckd_sub'
> 38 | #define ckd_sub(R, A, B) __builtin_sub_overflow((A), (B), (R))
>    |                                                      ^~~

The attached patch to gnulib helps here. I'm using clang version 18.1.8 and the 
testdir-all build fails if I ./configure CC=clang.

Pip

0001-timespec-sub-Fix-compilation-error-on-clang.patch
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