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* ; Add 2026 to copyright years.Sean Whitton2026-01-011-1/+1
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* Prefer C23 support if availablePaul Eggert2025-11-201-0/+746
This merges in changes that were made to Autoconf master in April 2024. It causes ‘configure’ to prefer the C compiler to enable C23 features if possible; otherwise, ‘configure’ behaves as before, using C11 if available and C99 if not. * admin/merge-gnulib (GNULIB_MODULES): Add std-gnu23. (AVOIDED_MODULES): Add (i.e., start avoiding) std-gnu11. * m4/std-gnu11.m4: Remove. * m4/std-gnu23.m4: Add.