stddef.h
========

POSIX specification:
 https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stddef.h.html

Gnulib module: stddef

Portability problems fixed by Gnulib:

  * Some platforms fail to provide max_align_t, which was added in C11: Solaris 11.0 and others.

  * max_align_t does not have the expected alignment on some platforms: NetBSD 8.0/x86.

  * Some old platforms fail to provide wchar_t.

  * Some platforms provide a NULL macro that cannot be used in arbitrary expressions: NetBSD 5.0

  * Some platforms provide a NULL macro whose value does not have the size of a pointer: AIX 7.2 with xlc in 64-bit mode.

Portability problems not fixed by Gnulib:

  * Some platforms provide an offsetof macro that cannot be used in arbitrary expressions: Solaris 11.4 This problem can be worked around by parenthesizing the offsetof expression in the unlikely case you use it with sizeof or [].