2010-05-12 03:42:16 +08:00
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// -*- C++ -*-
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2021-11-18 05:25:01 +08:00
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//===----------------------------------------------------------------------===//
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2010-05-12 03:42:16 +08:00
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//
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2019-01-19 18:56:40 +08:00
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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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2010-05-12 03:42:16 +08:00
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_CLOCALE
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#define _LIBCPP_CLOCALE
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/*
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clocale synopsis
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Macros:
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LC_ALL
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LC_COLLATE
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LC_CTYPE
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LC_MONETARY
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LC_NUMERIC
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LC_TIME
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NULL
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namespace std
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{
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struct lconv;
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char* setlocale(int category, const char* locale);
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lconv* localeconv();
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} // std
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*/
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#include <__config>
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#include <locale.h>
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2011-10-18 04:05:10 +08:00
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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2010-05-12 03:42:16 +08:00
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#pragma GCC system_header
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2011-10-18 04:05:10 +08:00
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#endif
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2010-05-12 03:42:16 +08:00
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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 22:41:37 +08:00
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using ::lconv _LIBCPP_USING_IF_EXISTS;
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using ::setlocale _LIBCPP_USING_IF_EXISTS;
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using ::localeconv _LIBCPP_USING_IF_EXISTS;
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2010-05-12 03:42:16 +08:00
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_LIBCPP_END_NAMESPACE_STD
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2021-04-21 00:03:32 +08:00
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#endif // _LIBCPP_CLOCALE
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