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/* 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.
 * <http://www.opengroup.org/susv3xbd/stddef.h.html>

#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 */

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