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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.
119 lines
2.3 KiB
C++
119 lines
2.3 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_FENV_H
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#define _LIBCPP_FENV_H
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/*
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fenv.h 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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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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*/
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#if defined(__cplusplus) && __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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# include <__cxx03/fenv.h>
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#else
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# include <__config>
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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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# if __has_include_next(<fenv.h>)
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# include_next <fenv.h>
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# endif
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# ifdef __cplusplus
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extern "C++" {
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# ifdef feclearexcept
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# undef feclearexcept
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# endif
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# ifdef fegetexceptflag
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# undef fegetexceptflag
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# endif
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# ifdef feraiseexcept
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# undef feraiseexcept
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# endif
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# ifdef fesetexceptflag
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# undef fesetexceptflag
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# endif
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# ifdef fetestexcept
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# undef fetestexcept
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# endif
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# ifdef fegetround
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# undef fegetround
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# endif
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# ifdef fesetround
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# undef fesetround
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# endif
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# ifdef fegetenv
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# undef fegetenv
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# endif
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# ifdef feholdexcept
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# undef feholdexcept
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# endif
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# ifdef fesetenv
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# undef fesetenv
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# endif
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# ifdef feupdateenv
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# undef feupdateenv
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# endif
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} // extern "C++"
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# endif // defined(__cplusplus)
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#endif // defined(__cplusplus) && __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
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#endif // _LIBCPP_FENV_H
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