8.51 stdnoreturn.h

POSIX specification:
Not in POSIX yet, but we expect it will be. ISO C11 (latest free draft http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf) sections 7.23.

Gnulib module: stdnoreturn

Portability problems fixed by Gnulib:

• This header file is missing on most circa-2012 platforms.

Portability problems not fixed by Gnulib:

• <stdnoreturn.h> should be #included before ‘_Noreturn’ is used.
• You cannot assume that _Noreturn is a reserved word; it might be a macro.
• On MSVC 9, noreturn expands to the empty token sequence, to avoid problems with standard headers that use __declspec (noreturn) directly. Although the resulting code operates correctly, the compiler is not informed whether noreturn functions do not return, so it may generate incorrect warnings at compile-time, or code that is slightly less optimized. This problem does not occur with _Noreturn.
• Circa 2012 bleeding-edge GCC with -Werror=old-style-declaration requires _Noreturn or noreturn before the returned type in a declaration, and therefore rejects valid but unusually-worded declarations such as void _Noreturn foo (void);.