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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.
96 lines
2.5 KiB
C++
96 lines
2.5 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_CFENV
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#define _LIBCPP_CFENV
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/*
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cfenv synopsis
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This entire header is C99 / C++0X
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Macros:
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FE_DIVBYZERO
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FE_INEXACT
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FE_INVALID
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FE_OVERFLOW
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FE_UNDERFLOW
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FE_ALL_EXCEPT
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FE_DOWNWARD
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FE_TONEAREST
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FE_TOWARDZERO
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FE_UPWARD
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FE_DFL_ENV
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namespace std
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{
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Types:
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fenv_t
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fexcept_t
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int feclearexcept(int excepts);
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int fegetexceptflag(fexcept_t* flagp, int excepts);
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int feraiseexcept(int excepts);
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int fesetexceptflag(const fexcept_t* flagp, int excepts);
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int fetestexcept(int excepts);
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int fegetround();
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int fesetround(int round);
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int fegetenv(fenv_t* envp);
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int feholdexcept(fenv_t* envp);
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int fesetenv(const fenv_t* envp);
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int feupdateenv(const fenv_t* envp);
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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/cfenv>
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#else
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# include <__config>
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# include <fenv.h>
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# ifndef _LIBCPP_FENV_H
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# error <cfenv> tried including <fenv.h> but didn't find libc++'s <fenv.h> header. \
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This usually means that your header search paths are not configured properly. \
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The header search paths should contain the C++ Standard Library headers before \
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any C Standard Library, and you are probably using compiler flags that make that \
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not be the case.
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# endif
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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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using ::fenv_t _LIBCPP_USING_IF_EXISTS;
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using ::fexcept_t _LIBCPP_USING_IF_EXISTS;
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using ::feclearexcept _LIBCPP_USING_IF_EXISTS;
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using ::fegetexceptflag _LIBCPP_USING_IF_EXISTS;
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using ::feraiseexcept _LIBCPP_USING_IF_EXISTS;
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using ::fesetexceptflag _LIBCPP_USING_IF_EXISTS;
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using ::fetestexcept _LIBCPP_USING_IF_EXISTS;
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using ::fegetround _LIBCPP_USING_IF_EXISTS;
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using ::fesetround _LIBCPP_USING_IF_EXISTS;
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using ::fegetenv _LIBCPP_USING_IF_EXISTS;
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using ::feholdexcept _LIBCPP_USING_IF_EXISTS;
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using ::fesetenv _LIBCPP_USING_IF_EXISTS;
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using ::feupdateenv _LIBCPP_USING_IF_EXISTS;
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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_CFENV
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