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Diffstat (limited to '')
| -rw-r--r-- | lib/stddef.in.h | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/lib/stddef.in.h b/lib/stddef.in.h new file mode 100644 index 0000000..c7ce608 --- /dev/null +++ b/lib/stddef.in.h @@ -0,0 +1,186 @@ +/* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues. + + Copyright (C) 2009-2023 Free Software Foundation, Inc. + + This file 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 of the + License, or (at your option) any later version. + + This file 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 and ISO C 23 <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@ + /* On TinyCC, make sure that the macros that indicate the special invocation + convention get undefined. */ +# undef __need_wchar_t +# undef __need_size_t +# undef __need_ptrdiff_t +# undef __need_NULL +# undef __need_wint_t +# endif + +#else +/* Normal invocation convention. */ + +# ifndef _@GUARD_PREFIX@_STDDEF_H + +/* On AIX 7.2, with xlc in 64-bit mode, <stddef.h> defines max_align_t to a + type with alignment 4, but 'long' has alignment 8. */ +# if defined _AIX && defined __LP64__ +# if !GNULIB_defined_max_align_t +# ifdef _MAX_ALIGN_T +/* /usr/include/stddef.h has already defined max_align_t. Override it. */ +typedef long rpl_max_align_t; +# define max_align_t rpl_max_align_t +# else +/* Prevent /usr/include/stddef.h from defining max_align_t. */ +typedef long max_align_t; +# define _MAX_ALIGN_T +# endif +# define __CLANG_MAX_ALIGN_T_DEFINED +# define GNULIB_defined_max_align_t 1 +# endif +# endif + +/* 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). + Similarly on OS/2 kLIBC. */ +#if (defined _MSC_VER || (defined __KLIBC__ && !defined __LIBCN__)) \ + && defined __cplusplus +# include <cstddef> +#else +# if ! (@HAVE_MAX_ALIGN_T@ || (defined _GCC_MAX_ALIGN_T && !defined __clang__)) +# 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. */ +# if defined __GNUC__ || (__clang_major__ >= 4) +# 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 __CLANG_MAX_ALIGN_T_DEFINED +# define GNULIB_defined_max_align_t 1 +# endif +# endif +#endif + +/* ISO C 23 ยง 7.21.1 The unreachable macro */ +#ifndef unreachable + +/* Code borrowed from verify.h. */ +# ifndef _GL_HAS_BUILTIN_UNREACHABLE +# if defined __clang_major__ && __clang_major__ < 5 +# define _GL_HAS_BUILTIN_UNREACHABLE 0 +# elif 4 < __GNUC__ + (5 <= __GNUC_MINOR__) +# define _GL_HAS_BUILTIN_UNREACHABLE 1 +# elif defined __has_builtin +# define _GL_HAS_BUILTIN_UNREACHABLE __has_builtin (__builtin_unreachable) +# else +# define _GL_HAS_BUILTIN_UNREACHABLE 0 +# endif +# endif + +# if _GL_HAS_BUILTIN_UNREACHABLE +# define unreachable() __builtin_unreachable () +# elif 1200 <= _MSC_VER +# define unreachable() __assume (0) +# else +/* Declare abort(), without including <stdlib.h>. */ +extern +# if defined __cplusplus +"C" +# endif +_Noreturn +void abort (void) +# if defined __cplusplus && (__GLIBC__ >= 2) +throw () +# endif +; +# define unreachable() abort () +# endif + +#endif + +# endif /* _@GUARD_PREFIX@_STDDEF_H */ +# endif /* _@GUARD_PREFIX@_STDDEF_H */ +#endif /* __need_XXX */ |