80 lines
3 KiB
C
80 lines
3 KiB
C
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/*===---- 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. It ignores
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* its header guard so that multiple submodules can export its interfaces.
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* Take module SM with submodules A and B, whose headers both include stdarg.h
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* When SM.A builds, __STDARG_H will be defined. When SM.B builds, the
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* definition from SM.A will leak when building without local submodule
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* visibility. stdarg.h wouldn't include any of its implementation headers, and
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* SM.B wouldn't import any of the stdarg modules, and SM.B's `export *`
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* wouldn't export any stdarg interfaces as expected. However, since stdarg.h
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* ignores its header guard when building with modules, it all works as
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* expected.
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*
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* When clang modules are not enabled, the header guards can function in the
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* normal simple fashion.
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*/
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#if !defined(__STDARG_H) || __has_feature(modules) || \
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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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#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 __STDARG_H
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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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#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
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