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10.1328 wmemcmp

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/wmemcmp.html

Gnulib module: wmemcmp

Portability problems fixed by Gnulib:

• This function is missing on some platforms: HP-UX 11.00, MSVC 14.
• This function compares the wide characters as if they were unsigned, although wchar_t is signed, on some platforms: glibc 2.14.1 on x86 or x86_64, musl libc 1.2.3, NetBSD 10.0, OpenBSD 7.2, Solaris 11.4.

Portability problems not fixed by Gnulib:

• On Windows and 32-bit AIX platforms, wchar_t is a 16-bit type and therefore cannot accommodate all Unicode characters.