/* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues.

   Copyright (C) 2009-2020 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU Lesser General Public License as published by

   the Free Software Foundation; either version 2.1, 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

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License

   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

/* Written by Eric Blake.  */

/*

 * POSIX 2008 <stddef.h> for platforms that have issues.

 * <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stddef.h.html>

 */

#if __GNUC__ >= 3

@PRAGMA_SYSTEM_HEADER@

#endif

@PRAGMA_COLUMNS@

#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 _@GUARD_PREFIX@_STDDEF_H && defined _GL_STDDEF_WINT_T)

#  ifdef __need_wint_t

#   define _GL_STDDEF_WINT_T

#  endif

#  @INCLUDE_NEXT@ @NEXT_STDDEF_H@

# endif

#else

/* Normal invocation convention.  */

# ifndef _@GUARD_PREFIX@_STDDEF_H

/* The include_next requires a split double-inclusion guard.  */

#  @INCLUDE_NEXT@ @NEXT_STDDEF_H@

/* On NetBSD 5.0, the definition of NULL lacks proper parentheses.  */

#  if (@REPLACE_NULL@ \

       && (!defined _@GUARD_PREFIX@_STDDEF_H || defined _GL_STDDEF_WINT_T))

#   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

#  endif

#  ifndef _@GUARD_PREFIX@_STDDEF_H

#   define _@GUARD_PREFIX@_STDDEF_H

/* Some platforms lack wchar_t.  */

#if !@HAVE_WCHAR_T@

# define wchar_t int

#endif

/* Some platforms lack max_align_t.  The check for _GCC_MAX_ALIGN_T is

   a hack in case the configure-time test was done with g++ even though

   we are currently compiling with gcc.

   On MSVC, max_align_t is defined only in C++ mode, after <cstddef> was

   included.  Its definition is good since it has an alignment of 8 (on x86

   and x86_64).  */

#if defined _MSC_VER && defined __cplusplus

# include <cstddef>

#else

# if ! (@HAVE_MAX_ALIGN_T@ || defined _GCC_MAX_ALIGN_T)

#  if !GNULIB_defined_max_align_t

/* On the x86, the maximum storage alignment of double, long, etc. is 4,

   but GCC's C11 ABI for x86 says that max_align_t has an alignment of 8,

   and the C11 standard allows this.  Work around this problem by

   using __alignof__ (which returns 8 for double) rather than _Alignof

   (which returns 4), and align each union member accordingly.  */

#   ifdef __GNUC__

#    define _GL_STDDEF_ALIGNAS(type) \

       __attribute__ ((__aligned__ (__alignof__ (type))))

#   else

#    define _GL_STDDEF_ALIGNAS(type) /* */

#   endif

typedef union

{

  char *__p _GL_STDDEF_ALIGNAS (char *);

  double __d _GL_STDDEF_ALIGNAS (double);

  long double __ld _GL_STDDEF_ALIGNAS (long double);

  long int __i _GL_STDDEF_ALIGNAS (long int);

} rpl_max_align_t;

#   define max_align_t rpl_max_align_t

#   define GNULIB_defined_max_align_t 1

#  endif

# endif

#endif

#  endif /* _@GUARD_PREFIX@_STDDEF_H */

# endif /* _@GUARD_PREFIX@_STDDEF_H */

#endif /* __need_XXX */