| /* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues. |
| |
| Copyright (C) 2009-2019 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 |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 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, see <https://www.gnu.org/licenses/>. */ |
| |
| /* Written by Eric Blake. */ |
| |
| /* |
| * POSIX 2008 <stddef.h> for platforms that have issues. |
| * <http://www.opengroup.org/susv3xbd/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. */ |
| #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 /* _@GUARD_PREFIX@_STDDEF_H */ |
| # endif /* _@GUARD_PREFIX@_STDDEF_H */ |
| #endif /* __need_XXX */ |