92a9d4831d
stddef.h always includes __stddef_null.h. This is fine in modules because it's not possible to re-include the pcm, and it's necessary to export the _Builtin_stddef.null submodule. However, without modules it causes NULL to always get redefined which disrupts some C++ code. Rework the inclusion of __stddef_null.h so that with not building with modules it's only included if __need_NULL is set by the includer, or it's the first time stddef.h is being included.
76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
/*===---- stdarg.h - Variable argument handling ----------------------------===
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*
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* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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* See https://llvm.org/LICENSE.txt for license information.
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* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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*
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*===-----------------------------------------------------------------------===
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*/
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/*
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* This header is designed to be included multiple times. If any of the __need_
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* macros are defined, then only that subset of interfaces are provided. This
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* can be useful for POSIX headers that need to not expose all of stdarg.h, but
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* need to use some of its interfaces. Otherwise this header provides all of
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* the expected interfaces.
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*
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* When clang modules are enabled, this header is a textual header to support
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* the multiple include behavior. As such, it doesn't directly declare anything
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* so that it doesn't add duplicate declarations to all of its includers'
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* modules.
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*/
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#if defined(__MVS__) && __has_include_next(<stdarg.h>)
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#undef __need___va_list
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#undef __need_va_list
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#undef __need_va_arg
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#undef __need___va_copy
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#undef __need_va_copy
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#include <__stdarg_header_macro.h>
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#include_next <stdarg.h>
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#else
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#if !defined(__need___va_list) && !defined(__need_va_list) && \
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!defined(__need_va_arg) && !defined(__need___va_copy) && \
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!defined(__need_va_copy)
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#define __need___va_list
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#define __need_va_list
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#define __need_va_arg
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#define __need___va_copy
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/* GCC always defines __va_copy, but does not define va_copy unless in c99 mode
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* or -ansi is not specified, since it was not part of C90.
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*/
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#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
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(defined(__cplusplus) && __cplusplus >= 201103L) || \
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!defined(__STRICT_ANSI__)
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#define __need_va_copy
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#endif
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#include <__stdarg_header_macro.h>
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#endif
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#ifdef __need___va_list
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#include <__stdarg___gnuc_va_list.h>
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#undef __need___va_list
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#endif /* defined(__need___va_list) */
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#ifdef __need_va_list
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#include <__stdarg_va_list.h>
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#undef __need_va_list
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#endif /* defined(__need_va_list) */
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#ifdef __need_va_arg
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#include <__stdarg_va_arg.h>
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#undef __need_va_arg
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#endif /* defined(__need_va_arg) */
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#ifdef __need___va_copy
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#include <__stdarg___va_copy.h>
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#undef __need___va_copy
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#endif /* defined(__need___va_copy) */
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#ifdef __need_va_copy
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#include <__stdarg_va_copy.h>
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#undef __need_va_copy
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#endif /* defined(__need_va_copy) */
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#endif /* __MVS__ */
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