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9.86 uchar.h ¶

ISO C23 specification:
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3220.pdf section 7.30.

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/uchar.h.html

Defines the types char16_t, char32_t and declares the functions mbrtoc16, c16rtomb, mbrtoc32, c32rtomb.

Gnulib module: uchar-h or uchar-h-c23

Portability problems fixed by either Gnulib module uchar-h or uchar-h-c23:

• This header file is missing on many non-glibc platforms: glibc 2.15, macOS 14, FreeBSD 6.4, NetBSD 10.0, OpenBSD 7.3, Minix 3.1.8, AIX 7.1, HP-UX 11.31, Solaris 11.3, Cygwin 3.4.x, mingw, MSVC 9.
• This file is not self-contained on some platforms: Haiku.
• This file produces compilation errors in C++ mode on some platforms: AIX 7.2 with xlclang++.

Portability problems fixed by Gnulib module uchar-h-c23:

• char32_t values may not be Unicode code points. This is the case in ISO C 11 compliant but not ISO C 23 compliant implementations.

Portability problems not fixed by Gnulib: