/* A substitute for POSIX 2008 , 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 . */ /* Written by Eric Blake. */ /* * POSIX 2008 and ISO C 23 for platforms that have issues. * */ #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 that blindly redefines NULL even when __need_wint_t was defined, even though wint_t is not normally provided by . 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 _@GUARD_PREFIX@_STDDEF_WINT_T) # ifdef __need_wint_t # define _@GUARD_PREFIX@_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, defines max_align_t to a type with alignment 4, but 'long' has alignment 8. */ # if defined _AIX && defined __LP64__ && !@HAVE_MAX_ALIGN_T@ # 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 _@GUARD_PREFIX@_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 /* This file uses _Noreturn, _GL_ATTRIBUTE_NOTHROW. */ #if !_GL_CONFIG_H_INCLUDED #error "Please include config.h first." #endif /* _GL_ATTRIBUTE_NOTHROW declares that the function does not throw exceptions. */ #ifndef _GL_ATTRIBUTE_NOTHROW # if defined __cplusplus # if (__GNUC__ + (__GNUC_MINOR__ >= 8) > 2) || __clang_major >= 4 # if __cplusplus >= 201103L # define _GL_ATTRIBUTE_NOTHROW noexcept (true) # else # define _GL_ATTRIBUTE_NOTHROW throw () # endif # else # define _GL_ATTRIBUTE_NOTHROW # endif # else # if (__GNUC__ + (__GNUC_MINOR__ >= 3) > 3) || defined __clang__ # define _GL_ATTRIBUTE_NOTHROW __attribute__ ((__nothrow__)) # else # define _GL_ATTRIBUTE_NOTHROW # endif # endif #endif /* 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 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 #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 . */ extern # if defined __cplusplus "C" # endif _Noreturn void abort (void) # if defined __cplusplus && (__GLIBC__ >= 2) _GL_ATTRIBUTE_NOTHROW # endif ; # define unreachable() abort () # endif #endif # endif /* _@GUARD_PREFIX@_STDDEF_H */ # endif /* _@GUARD_PREFIX@_STDDEF_H */ #endif /* __need_XXX */