This splits off support for the C23 keywords alignas and alignof,
from the now-deprecated stdalign module. The latter now merely
provides C11 support.
* MODULES.html.sh, NEWS, doc/gnulib.texi:
* doc/posix-headers/stdalign.texi: Document the change.
* lib/stdalign.in.h: Remove most of the definitions (which are now
supplied by the alignasof module), leaving only
__alignas_is_defined and __alignof_is_defined.
* modules/alignasof, modules/alignasof-tests: New files.
* m4/stdalign.m4 (gl_ALIGNASOF): New macro, with
most of the contents of the old gl_STDALIGN_H.
Do not define __alignas_is_defined or __alignof_is_defined.
(gl_STDALIGN_H): Rely on gl_ALIGNASOF for most of the work.
* modules/alignalloc, modules/alignof, modules/argp:
* modules/crypto/md4-buffer, modules/crypto/md5-buffer:
* modules/crypto/sha1-buffer, modules/crypto/sha256-buffer:
* modules/crypto/sha512-buffer, modules/crypto/sm3-buffer:
* modules/fts, modules/rawmemchr, modules/relocatable-prog-wrapper:
* modules/stddef-tests, modules/sys_socket:
Depend on alignasof, not stdalign.
* modules/stdalign: Deprecate. Depend on alignasof.
* modules/stdalign-tests: Move most contents to the new module
alignasof-tests, and depend on that.
stdckdint.h is part of draft C23 and therefore is more likely
to be familiar to programmers in the future, so prefer it to
intprops.h in files that don’t need non-_WRAPV intprops.h macros.
* lib/alignalloc.c, lib/backupfile.c, lib/fnmatch.c, lib/fnmatch_loop.c:
* lib/group-member.c, lib/malloca.c, lib/posixtm.c, lib/reallocarray.c:
* lib/xmalloc.c:
For files that can use stdckdint.h just as easily as intprops.h,
include the former instead of the latter, and use the former’s
ckd_* macros instead of the latter’s *_WRAPV macros.
* modules/alignalloc, modules/backup-rename, modules/backupfile:
* modules/fnmatch, modules/group-member, modules/malloca:
* modules/posixtm, modules/reallocarray:
* modules/relocatable-prog-wrapper, modules/xalloc:
Depend on stdckdint instead of intprops.
