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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.
73 lines
1.7 KiB
C++
73 lines
1.7 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_IOSTREAM
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#define _LIBCPP_IOSTREAM
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/*
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iostream synopsis
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#include <ios>
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#include <istream>
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#include <ostream>
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#include <streambuf>
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namespace std {
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extern istream cin;
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extern ostream cout;
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extern ostream cerr;
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extern ostream clog;
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extern wistream wcin;
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extern wostream wcout;
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extern wostream wcerr;
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extern wostream wclog;
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} // std
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*/
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#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/iostream>
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#else
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# include <__config>
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# include <version>
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// standard-mandated includes
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// [iostream.syn]
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# include <ios>
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# include <istream>
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# include <ostream>
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# include <streambuf>
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# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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# endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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extern _LIBCPP_EXPORTED_FROM_ABI istream cin;
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extern _LIBCPP_EXPORTED_FROM_ABI ostream cout;
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extern _LIBCPP_EXPORTED_FROM_ABI ostream cerr;
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extern _LIBCPP_EXPORTED_FROM_ABI ostream clog;
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# if _LIBCPP_HAS_WIDE_CHARACTERS
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extern _LIBCPP_EXPORTED_FROM_ABI wistream wcin;
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extern _LIBCPP_EXPORTED_FROM_ABI wostream wcout;
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extern _LIBCPP_EXPORTED_FROM_ABI wostream wcerr;
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extern _LIBCPP_EXPORTED_FROM_ABI wostream wclog;
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# endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_IOSTREAM
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