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stddef.h
/*===---- stddef.h - Basic type definitions --------------------------------=== * * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. * See https://llvm.org/LICENSE.txt for license information. * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception * *===-----------------------------------------------------------------------=== */ /* * This header is designed to be included multiple times. If any of the __need_ * macros are defined, then only that subset of interfaces are provided. This * can be useful for POSIX headers that need to not expose all of stddef.h, but * need to use some of its interfaces. Otherwise this header provides all of * the expected interfaces. * * When clang modules are enabled, this header is a textual header to support * the multiple include behavior. As such, it doesn't directly declare anything * so that it doesn't add duplicate declarations to all of its includers' * modules. */ #if defined(__MVS__) && __has_include_next(<stddef.h>) #undef __need_ptrdiff_t #undef __need_size_t #undef __need_rsize_t #undef __need_wchar_t #undef __need_NULL #undef __need_nullptr_t #undef __need_unreachable #undef __need_max_align_t #undef __need_offsetof #undef __need_wint_t #include <__stddef_header_macro.h> #include_next <stddef.h> #else #if !defined(__need_ptrdiff_t) && !defined(__need_size_t) && \ !defined(__need_rsize_t) && !defined(__need_wchar_t) && \ !defined(__need_NULL) && !defined(__need_nullptr_t) && \ !defined(__need_unreachable) && !defined(__need_max_align_t) && \ !defined(__need_offsetof) && !defined(__need_wint_t) #define __need_ptrdiff_t #define __need_size_t /* ISO9899:2011 7.20 (C11 Annex K): Define rsize_t if __STDC_WANT_LIB_EXT1__ is * enabled. */ #if defined(__STDC_WANT_LIB_EXT1__) && __STDC_WANT_LIB_EXT1__ >= 1 #define __need_rsize_t #endif #define __need_wchar_t #if !defined(__STDDEF_H) || __has_feature(modules) /* * __stddef_null.h is special when building without modules: if __need_NULL is * set, then it will unconditionally redefine NULL. To avoid stepping on client * definitions of NULL, __need_NULL should only be set the first time this * header is included, that is when __STDDEF_H is not defined. However, when * building with modules, this header is a textual header and needs to * unconditionally include __stdef_null.h to support multiple submodules * exporting _Builtin_stddef.null. Take module SM with submodules A and B, whose * headers both include stddef.h When SM.A builds, __STDDEF_H will be defined. * When SM.B builds, the definition from SM.A will leak when building without * local submodule visibility. stddef.h wouldn't include __stddef_null.h, and * SM.B wouldn't import _Builtin_stddef.null, and SM.B's `export *` wouldn't * export NULL as expected. When building with modules, always include * __stddef_null.h so that everything works as expected. */ #define __need_NULL #endif #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L) || \ defined(__cplusplus) #define __need_nullptr_t #endif #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L #define __need_unreachable #endif #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \ (defined(__cplusplus) && __cplusplus >= 201103L) #define __need_max_align_t #endif #define __need_offsetof /* wint_t is provided by <wchar.h> and not <stddef.h>. It's here * for compatibility, but must be explicitly requested. Therefore * __need_wint_t is intentionally not defined here. */ #include <__stddef_header_macro.h> #endif #if defined(__need_ptrdiff_t) #include <__stddef_ptrdiff_t.h> #undef __need_ptrdiff_t #endif /* defined(__need_ptrdiff_t) */ #if defined(__need_size_t) #include <__stddef_size_t.h> #undef __need_size_t #endif /*defined(__need_size_t) */ #if defined(__need_rsize_t) #include <__stddef_rsize_t.h> #undef __need_rsize_t #endif /* defined(__need_rsize_t) */ #if defined(__need_wchar_t) #include <__stddef_wchar_t.h> #undef __need_wchar_t #endif /* defined(__need_wchar_t) */ #if defined(__need_NULL) #include <__stddef_null.h> #undef __need_NULL #endif /* defined(__need_NULL) */ #if defined(__need_nullptr_t) #include <__stddef_nullptr_t.h> #undef __need_nullptr_t #endif /* defined(__need_nullptr_t) */ #if defined(__need_unreachable) #include <__stddef_unreachable.h> #undef __need_unreachable #endif /* defined(__need_unreachable) */ #if defined(__need_max_align_t) #include <__stddef_max_align_t.h> #undef __need_max_align_t #endif /* defined(__need_max_align_t) */ #if defined(__need_offsetof) #include <__stddef_offsetof.h> #undef __need_offsetof #endif /* defined(__need_offsetof) */ /* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use __WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */ #if defined(__need_wint_t) #include <__stddef_wint_t.h> #undef __need_wint_t #endif /* __need_wint_t */ #endif /* __MVS__ */
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