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b9a2658a3e
This patch implements the forwarding to frozen C++03 headers as discussed in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the RFC, we initially proposed selecting the right headers from the Clang driver, however consensus seemed to steer towards handling this in the library itself. This patch implements that direction. At a high level, the changes basically amount to making each public header look like this: ``` // inside <vector> #ifdef _LIBCPP_CXX03_LANG # include <__cxx03/vector> #else // normal <vector> content #endif ``` In most cases, public headers are simple umbrella headers so there isn't much code in the #else branch. In other cases, the #else branch contains the actual implementation of the header.
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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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#ifndef _LIBCPP___CXX03___CONFIGURATION_LANGUAGE_H
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#define _LIBCPP___CXX03___CONFIGURATION_LANGUAGE_H
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#include <__cxx03/__configuration/config_site_shim.h>
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#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
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# pragma GCC system_header
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#endif
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// NOLINTBEGIN(libcpp-cpp-version-check)
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#ifdef __cplusplus
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# if __cplusplus <= 201103L
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# define _LIBCPP_STD_VER 11
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# elif __cplusplus <= 201402L
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# define _LIBCPP_STD_VER 14
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# elif __cplusplus <= 201703L
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# define _LIBCPP_STD_VER 17
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# elif __cplusplus <= 202002L
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# define _LIBCPP_STD_VER 20
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# elif __cplusplus <= 202302L
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# define _LIBCPP_STD_VER 23
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# else
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// Expected release year of the next C++ standard
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# define _LIBCPP_STD_VER 26
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# endif
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#endif // __cplusplus
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// NOLINTEND(libcpp-cpp-version-check)
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#if !defined(__cpp_rtti) || __cpp_rtti < 199711L
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# define _LIBCPP_HAS_NO_RTTI
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#endif
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#if !defined(__cpp_exceptions) || __cpp_exceptions < 199711L
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# define _LIBCPP_HAS_NO_EXCEPTIONS
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#endif
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#endif // _LIBCPP___CXX03___CONFIGURATION_LANGUAGE_H
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