c32*: Optionally enforce ISO C 23 semantics of char32_t.

* lib/lc-charset-unicode.h: New file.
* lib/lc-charset-unicode.c: New file.
* modules/uchar-c23: New file.
* lib/uchar.in.h (char32_t): Add comment.
* lib/mbrtoc32.c: Include lc-charset-unicode.h.
(mbrtoc32): If char32_t is Unicode and wchar_t is not, invoke
locale_encoding_to_unicode.
* lib/btoc32.c: Include lc-charset-unicode.h.
(btoc32): If char32_t is Unicode and wchar_t is not, invoke
locale_encoding_to_unicode.
* lib/c32rtomb.c: Include lc-charset-unicode.h.
(c32rtomb): If char32_t is Unicode and wchar_t is not, invoke
unicode_to_locale_encoding.
* lib/c32tob.c: Include lc-charset-unicode.h.
(c32tob): If char32_t is Unicode and wchar_t is not, invoke
unicode_to_locale_encoding.
* lib/mbsnrtoc32s.c: If char32_t is Unicode and wchar_t is not, don't
use mbsnrtowcs.
* lib/mbsrtoc32s.c: If char32_t is Unicode and wchar_t is not, don't use
mbsrtowcs.
* lib/c32snrtombs.c: If char32_t is Unicode and wchar_t is not, don't
use wcsnrtombs.
* lib/c32srtombs.c: If char32_t is Unicode and wchar_t is not, don't use
wcsrtombs.
* lib/c32is-impl.h: Include lc-charset-unicode.h.
(FUNC): If char32_t is Unicode and wchar_t is not, use UCS_FUNC.
* lib/c32to-impl.h: Include lc-charset-unicode.h.
(FUNC): If char32_t is Unicode and wchar_t is not, use UCS_FUNC.
* lib/c32width.c: Include lc-charset-unicode.h.
(c32width): If char32_t is Unicode and wchar_t is not, use uc_width.
* tests/test-mbrtoc32.c: Include <wchar.h>.
(main): Skip GB18030 tests on NetBSD and Solaris. If
GL_CHAR32_T_IS_UNICODE, expect Unicode encoding for the char32_t values.
* tests/test-mbrtoc32-w32.c: Include <wchar.h>.
(test_one_locale): Simplify.
* tests/test-c32rtomb.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32rtomb.sh: Update.
* tests/test-mbsnrtoc32s.c: Include <wchar.h>.
(main): Skip GB18030 tests on NetBSD and Solaris.
* tests/test-mbsrtoc32s.c: Include <wchar.h>.
(main): Skip GB18030 tests on NetBSD and Solaris.
* tests/test-mbstoc32s.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32snrtombs.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32srtombs.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32stombs.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32isalnum.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32isalnum.sh: Update.
* tests/test-c32isalpha.c (main): Skip GB18030 tests on NetBSD and
Solaris. Disable tests that would fail on macOS, FreeBSD, NetBSD,
Solaris.
* tests/test-c32isalpha.sh: Update.
* tests/test-c32isblank.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32isblank.sh: Update.
* tests/test-c32iscntrl.c (main): Skip GB18030 tests on NetBSD and
Solaris. Disable tests that would fail on macOS, FreeBSD, NetBSD,
Solaris.
* tests/test-c32iscntrl.sh: Update.
* tests/test-c32isdigit.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32isdigit.sh: Update.
* tests/test-c32isgraph.c (main): Skip GB18030 tests on NetBSD and
Solaris. Disable tests that would fail on macOS, FreeBSD, NetBSD,
Solaris.
* tests/test-c32isgraph.sh: Update.
* tests/test-c32islower.c (main): Skip GB18030 tests on NetBSD and
Solaris. Disable tests that would fail on macOS, FreeBSD, NetBSD,
Solaris.
* tests/test-c32islower.sh: Update.
* tests/test-c32isprint.c (main): Skip GB18030 tests on NetBSD and
Solaris. Disable tests that would fail on macOS, FreeBSD, NetBSD,
Solaris.
* tests/test-c32isprint.sh: Update.
* tests/test-c32ispunct.c (main): Skip GB18030 tests on NetBSD and
Solaris. Disable tests that would fail on macOS, FreeBSD, NetBSD,
Solaris.
* tests/test-c32ispunct.sh: Update.
* tests/test-c32isspace.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32isspace.sh: Update.
* tests/test-c32isupper.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32isupper.sh: Update.
* tests/test-c32isxdigit.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32isxdigit.sh: Update.
* tests/test-c32tolower.c (main): Skip GB18030 tests on NetBSD and
Solaris.
* tests/test-c32tolower.sh: Update.
* tests/test-c32toupper.c (main): Skip GB18030 tests on NetBSD and
Solaris. Disable tests that would fail on macOS, FreeBSD, NetBSD,
Solaris.
* tests/test-c32toupper.sh: Update.
* modules/mbrtoc32 (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/mbrtoc32-tests (Makefile.am): Link test-mbrtoc32 with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/btoc32 (Link): New section.
* modules/btoc32-tests (Makefile.am): Link test-btoc32 with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/c32rtomb (Link): New section.
* modules/c32rtomb-tests (Makefile.am): Link test-c32rtomb with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/c32tob (Link): New section.
* modules/mbsnrtoc32s (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/mbsnrtoc32s-tests (Makefile.am): Link test-mbsnrtoc32s with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/mbsrtoc32s (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/mbsrtoc32s-tests (Makefile.am): Link test-mbsrtoc32s with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/mbstoc32s (Link): Add $(LIBUNISTRING) $(LIBC32CONV).
* modules/mbstoc32s-tests (Makefile.am): Link test-mbstoc32s with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/c32snrtombs (Link): New section.
* modules/c32snrtombs-tests (Makefile.am): Link test-c32snrtombs with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/c32srtombs (Link): New section.
* modules/c32srtombs-tests (Makefile.am): Link test-c32srtombs with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/c32stombs (Link): New section.
* modules/c32stombs-tests (Makefile.am): Link test-c32stombs with
$(LIBUNISTRING) $(LIBC32CONV).
* modules/c32isalnum (Link): Add $(LIBC32CONV).
* modules/c32isalnum-tests (Makefile.am): Link test-c32isalnum with
$(LIBC32CONV).
* modules/c32isalpha (Link): Add $(LIBC32CONV).
* modules/c32isalpha-tests (Makefile.am): Link test-c32isalpha with
$(LIBC32CONV).
* modules/c32isblank (Link): Add $(LIBC32CONV).
* modules/c32isblank-tests (Makefile.am): Link test-c32isblank with
$(LIBC32CONV).
* modules/c32iscntrl (Link): Add $(LIBC32CONV).
* modules/c32iscntrl-tests (Makefile.am): Link test-c32iscntrl with
$(LIBC32CONV).
* modules/c32isdigit (Link): Add $(LIBC32CONV).
* modules/c32isdigit-tests (Makefile.am): Link test-c32isdigit with
$(LIBC32CONV).
* modules/c32isgraph (Link): Add $(LIBC32CONV).
* modules/c32isgraph-tests (Makefile.am): Link test-c32isgraph with
$(LIBC32CONV).
* modules/c32islower (Link): Add $(LIBC32CONV).
* modules/c32islower-tests (Makefile.am): Link test-c32islower with
$(LIBC32CONV).
* modules/c32isprint (Link): Add $(LIBC32CONV).
* modules/c32isprint-tests (Makefile.am): Link test-c32isprint with
$(LIBC32CONV).
* modules/c32ispunct (Link): Add $(LIBC32CONV).
* modules/c32ispunct-tests (Makefile.am): Link test-c32ispunct with
$(LIBC32CONV).
* modules/c32isspace (Link): Add $(LIBC32CONV).
* modules/c32isspace-tests (Makefile.am): Link test-c32isspace with
$(LIBC32CONV).
* modules/c32isupper (Link): Add $(LIBC32CONV).
* modules/c32isupper-tests (Makefile.am): Link test-c32isupper with
$(LIBC32CONV).
* modules/c32isxdigit (Link): Add $(LIBC32CONV).
* modules/c32isxdigit-tests (Makefile.am): Link test-c32isxdigit with
$(LIBC32CONV).
* modules/c32tolower (Link): Add $(LIBC32CONV).
* modules/c32tolower-tests (Makefile.am): Link test-c32tolower with
$(LIBC32CONV).
* modules/c32toupper (Link): Add $(LIBC32CONV).
* modules/c32toupper-tests (Makefile.am): Link test-c32toupper with
$(LIBC32CONV).
* modules/c32width (Link): Add $(LIBC32CONV).
* modules/c32width-tests (Makefile.am): Link test-c32width with
$(LIBC32CONV).
* modules/c32swidth (Link): Add $(LIBC32CONV).
* modules/c32swidth-tests (Makefile.am): Link test-c32swidth with
$(LIBC32CONV).
* modules/mbchar (Link): Add $(LIBC32CONV).
* modules/mbiter (Link): Add $(LIBC32CONV).
* modules/mbuiter (Link): Add $(LIBC32CONV).
* modules/mbfile (Link): Add $(LIBC32CONV).
* modules/mbmemcasecmp (Link): Add $(LIBC32CONV).
* modules/mbmemcasecmp-tests (Makefile.am): Link test-mbmemcasecmp with
$(LIBC32CONV).
* modules/mbscasecmp (Link): Add $(LIBC32CONV).
* modules/mbscasecmp-tests (Makefile.am): Link test-mbscasecmp with
$(LIBC32CONV).
* modules/mbscasestr (Link): Add $(LIBC32CONV).
* modules/mbscasestr-tests (Makefile.am): Link test-mbscasestr1,
test-mbscasestr2, test-mbscasestr3, test-mbscasestr4 with $(LIBC32CONV).
* modules/mbschr (Link): Add $(LIBC32CONV).
* modules/mbschr-tests (Makefile.am): Link test-mbschr with
$(LIBC32CONV).
* modules/mbscspn (Link): Add $(LIBC32CONV).
* modules/mbscspn-tests (Makefile.am): Link test-mbscspn with
$(LIBC32CONV).
* modules/mbslen (Link): Add $(LIBC32CONV).
* modules/mbsncasecmp (Link): Add $(LIBC32CONV).
* modules/mbsncasecmp-tests (Makefile.am): Link test-mbsncasecmp with
$(LIBC32CONV).
* modules/mbsnlen (Link): Add $(LIBC32CONV).
* modules/mbspbrk (Link): Add $(LIBC32CONV).
* modules/mbspbrk-tests (Makefile.am): Link test-mbspbrk with
$(LIBC32CONV).
* modules/mbspcasecmp (Link): Add $(LIBC32CONV).
* modules/mbspcasecmp-tests (Makefile.am): Link test-mbspcasecmp with
$(LIBC32CONV).
* modules/mbsrchr (Link): Add $(LIBC32CONV).
* modules/mbsrchr-tests (Makefile.am): Link test-mbsrchr with
$(LIBC32CONV).
* modules/mbssep (Link): Add $(LIBC32CONV).
* modules/mbsspn (Link): Add $(LIBC32CONV).
* modules/mbsspn-tests (Makefile.am): Link test-mbsspn with
$(LIBC32CONV).
* modules/mbsstr (Link): Add $(LIBC32CONV).
* modules/mbsstr-tests (Makefile.am): Link test-mbsstr1, test-mbsstr2,
test-mbsstr3 with $(LIBC32CONV).
* modules/mbstok_r (Link): Add $(LIBC32CONV).
* modules/propername (Link): Add $(LIBC32CONV).
* modules/regex-quote (Link): Add $(LIBC32CONV).
* modules/regex-quote-tests (Makefile.am): Link test-regex-quote with
$(LIBC32CONV).
* modules/trim (Link): Add $(LIBC32CONV).
* modules/trim-tests (Makefile.am): Link test-trim with $(LIBC32CONV).
* modules/exclude (Link): Add $(LIBC32CONV).
* modules/exclude-tests (Makefile.am): Link test-exclude with
$(LIBC32CONV).
* doc/posix-headers/uchar.texi: Mention the uchar-c23 module.
* doc/posix-functions/mbrtoc32.texi: Likewise.
* doc/strings.texi (The char32_t type): Likewise.

modules/regex-quote

@@ -22,6 +22,7 @@ Include:
 Link:
 $(LTLIBUNISTRING) when linking with libtool, $(LIBUNISTRING) otherwise
 $(MBRTOWC_LIB)
+$(LTLIBC32CONV) when linking with libtool, $(LIBC32CONV) otherwise
 
 License:
 GPL