blob: 08778a2336d55dbaf6560819907823f263b95e51 [file] [log] [blame]
/* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues.
Copyright (C) 2009, 2010 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Written by Eric Blake. */
* POSIX 2008 <stddef.h> for platforms that have issues.
* <>
#if __GNUC__ >= 3
#if defined __need_wchar_t || defined __need_size_t \
|| defined __need_ptrdiff_t || defined __need_NULL \
|| defined __need_wint_t
/* Special invocation convention inside gcc header files. In
particular, gcc provides a version of <stddef.h> that blindly
redefines NULL even when __need_wint_t was defined, even though
wint_t is not normally provided by <stddef.h>. Hence, we must
remember if special invocation has ever been used to obtain wint_t,
in which case we need to clean up NULL yet again. */
# if !(defined _GL_STDDEF_H && defined _GL_STDDEF_WINT_T)
# ifdef __need_wint_t
# undef _GL_STDDEF_H
# define _GL_STDDEF_WINT_T
# endif
# endif
/* Normal invocation convention. */
# ifndef _GL_STDDEF_H
/* The include_next requires a split double-inclusion guard. */
# ifndef _GL_STDDEF_H
# define _GL_STDDEF_H
/* On NetBSD 5.0, the definition of NULL lacks proper parentheses. */
# undef NULL
# ifdef __cplusplus
/* ISO C++ says that the macro NULL must expand to an integer constant
expression, hence '((void *) 0)' is not allowed in C++. */
# if __GNUG__ >= 3
/* GNU C++ has a __null macro that behaves like an integer ('int' or
'long') but has the same size as a pointer. Use that, to avoid
warnings. */
# define NULL __null
# else
# define NULL 0L
# endif
# else
# define NULL ((void *) 0)
# endif
/* Some platforms lack wchar_t. */
# define wchar_t int
# endif /* _GL_STDDEF_H */
# endif /* _GL_STDDEF_H */
#endif /* __need_XXX */