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5d87f60f89
Some platforms don't provide all C library headers. In practice, libc++
only requires a few C library headers to exist, and only a few functions
on those headers. Missing functions that libc++ doesn't need for its own
implementation are handled properly by the using_if_exists attribute,
however a missing header is currently a hard error when we try to
do #include_next.
This patch should make libc++ more flexible on platforms that do not
provide C headers that libc++ doesn't actually require for its own
implementation. The only downside is that it may move some errors from
the #include_next point to later in the compilation if we actually try
to use something that isn't provided, which could be somewhat confusing.
However, these errors should be caught by folks trying to port libc++
over to a new platform (when running the libc++ test suite), not by end
users.
NOTE: This is a reapplicaton of 226409, which was reverted in 674729813
because it broke the build. The issue has now been fixed with
https://reviews.llvm.org/D138062.
Differential Revision: https://reviews.llvm.org/D136683
119 lines
1.9 KiB
C++
119 lines
1.9 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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#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 // _LIBCPP_FENV_H
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