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110 lines
3.7 KiB
110 lines
3.7 KiB
/* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues. |
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Copyright (C) 2009-2017 Free Software Foundation, Inc. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3, or (at your option) |
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any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, see <http://www.gnu.org/licenses/>. */ |
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/* Written by Eric Blake. */ |
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/* |
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* POSIX 2008 <stddef.h> for platforms that have issues. |
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* <http://www.opengroup.org/susv3xbd/stddef.h.html> |
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*/ |
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#if __GNUC__ >= 3 |
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@PRAGMA_SYSTEM_HEADER@ |
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#endif |
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@PRAGMA_COLUMNS@ |
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#if defined __need_wchar_t || defined __need_size_t \ |
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|| defined __need_ptrdiff_t || defined __need_NULL \ |
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|| defined __need_wint_t |
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/* Special invocation convention inside gcc header files. In |
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particular, gcc provides a version of <stddef.h> that blindly |
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redefines NULL even when __need_wint_t was defined, even though |
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wint_t is not normally provided by <stddef.h>. Hence, we must |
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remember if special invocation has ever been used to obtain wint_t, |
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in which case we need to clean up NULL yet again. */ |
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# if !(defined _@GUARD_PREFIX@_STDDEF_H && defined _GL_STDDEF_WINT_T) |
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# ifdef __need_wint_t |
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# define _GL_STDDEF_WINT_T |
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# endif |
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# @INCLUDE_NEXT@ @NEXT_STDDEF_H@ |
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# endif |
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#else |
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/* Normal invocation convention. */ |
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# ifndef _@GUARD_PREFIX@_STDDEF_H |
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/* The include_next requires a split double-inclusion guard. */ |
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# @INCLUDE_NEXT@ @NEXT_STDDEF_H@ |
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/* On NetBSD 5.0, the definition of NULL lacks proper parentheses. */ |
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# if (@REPLACE_NULL@ \ |
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&& (!defined _@GUARD_PREFIX@_STDDEF_H || defined _GL_STDDEF_WINT_T)) |
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# undef NULL |
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# ifdef __cplusplus |
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/* ISO C++ says that the macro NULL must expand to an integer constant |
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expression, hence '((void *) 0)' is not allowed in C++. */ |
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# if __GNUG__ >= 3 |
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/* GNU C++ has a __null macro that behaves like an integer ('int' or |
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'long') but has the same size as a pointer. Use that, to avoid |
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warnings. */ |
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# define NULL __null |
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# else |
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# define NULL 0L |
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# endif |
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# else |
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# define NULL ((void *) 0) |
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# endif |
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# endif |
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# ifndef _@GUARD_PREFIX@_STDDEF_H |
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# define _@GUARD_PREFIX@_STDDEF_H |
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/* Some platforms lack wchar_t. */ |
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#if !@HAVE_WCHAR_T@ |
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# define wchar_t int |
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#endif |
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/* Some platforms lack max_align_t. The check for _GCC_MAX_ALIGN_T is |
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a hack in case the configure-time test was done with g++ even though |
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we are currently compiling with gcc. */ |
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#if ! (@HAVE_MAX_ALIGN_T@ || defined _GCC_MAX_ALIGN_T) |
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/* On the x86, the maximum storage alignment of double, long, etc. is 4, |
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but GCC's C11 ABI for x86 says that max_align_t has an alignment of 8, |
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and the C11 standard allows this. Work around this problem by |
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using __alignof__ (which returns 8 for double) rather than _Alignof |
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(which returns 4), and align each union member accordingly. */ |
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# ifdef __GNUC__ |
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# define _GL_STDDEF_ALIGNAS(type) \ |
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__attribute__ ((__aligned__ (__alignof__ (type)))) |
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# else |
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# define _GL_STDDEF_ALIGNAS(type) /* */ |
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# endif |
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typedef union |
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{ |
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char *__p _GL_STDDEF_ALIGNAS (char *); |
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double __d _GL_STDDEF_ALIGNAS (double); |
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long double __ld _GL_STDDEF_ALIGNAS (long double); |
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long int __i _GL_STDDEF_ALIGNAS (long int); |
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} max_align_t; |
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#endif |
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# endif /* _@GUARD_PREFIX@_STDDEF_H */ |
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# endif /* _@GUARD_PREFIX@_STDDEF_H */ |
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#endif /* __need_XXX */
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