2010-05-11 19:42:16 +00:00
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// -*- C++ -*-
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2021-11-17 21:25:01 +00:00
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//===----------------------------------------------------------------------===//
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2010-05-11 19:42:16 +00:00
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//
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2019-01-19 10:56:40 +00:00
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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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2010-05-11 19:42:16 +00:00
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_CSTDARG
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#define _LIBCPP_CSTDARG
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/*
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cstdarg synopsis
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Macros:
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type va_arg(va_list ap, type);
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void va_copy(va_list dest, va_list src); // C99
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void va_end(va_list ap);
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void va_start(va_list ap, parmN);
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2010-08-22 00:02:43 +00:00
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2010-05-11 19:42:16 +00:00
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namespace std
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{
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Types:
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va_list
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} // std
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*/
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2022-03-25 16:55:36 +00:00
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#include <__assert> // all public C++ headers provide the assertion handler
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2010-05-11 19:42:16 +00:00
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#include <__config>
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2022-11-22 18:42:33 +00:00
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// <stdarg.h> is not provided by libc++
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#if __has_include(<stdarg.h>)
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# include <stdarg.h>
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# ifdef _LIBCPP_STDARG_H
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# error "If libc++ starts defining <stdarg.h>, the __has_include check should move to libc++'s <stdarg.h>"
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# endif
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#endif
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2010-05-11 19:42:16 +00:00
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2011-10-17 20:05:10 +00:00
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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2022-02-02 01:16:40 +00:00
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# pragma GCC system_header
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2011-10-17 20:05:10 +00:00
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#endif
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2010-05-11 19:42:16 +00:00
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_LIBCPP_BEGIN_NAMESPACE_STD
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[libc++] Use the using_if_exists attribute when provided
As discussed on cfe-dev [1], use the using_if_exists Clang attribute when
the compiler supports it. This makes it easier to port libc++ on top of
new platforms that don't fully support the C Standard library.
Previously, libc++ would fail to build when trying to import a missing
declaration in a <cXXXX> header. With the attribute, the declaration will
simply not be imported into namespace std, and hence it won't be available
for libc++ to use. In many cases, the declarations were *not* actually
required for libc++ to work (they were only surfaced for users to use
them as std::XXXX), so not importing them into namespace std is acceptable.
The same thing could be achieved by conscious usage of `#ifdef` along
with platform detection, however that quickly creates a maintenance
problem as libc++ is ported to new platforms. Furthermore, this problem
is exacerbated when mixed with vendor internal-only platforms, which can
lead to difficulties maintaining a downstream fork of the library.
For the time being, we only use the using_if_exists attribute when it
is supported. At some point in the future, we will start removing #ifdef
paths that are unnecessary when the attribute is supported, and folks
who need those #ifdef paths will be required to use a compiler that
supports the attribute.
[1]: http://lists.llvm.org/pipermail/cfe-dev/2020-June/066038.html
Differential Revision: https://reviews.llvm.org/D90257
2021-06-02 14:41:37 +00:00
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using ::va_list _LIBCPP_USING_IF_EXISTS;
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2010-05-11 19:42:16 +00:00
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_LIBCPP_END_NAMESPACE_STD
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2021-04-20 16:03:32 +00:00
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#endif // _LIBCPP_CSTDARG
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