ceph/src/boost/libs/detail/include/boost/detail/fenv.hpp

   1 /*=============================================================================
   2     Copyright (c) 2010      Bryce Lelbach
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 =============================================================================*/
   7
   8 #include <boost/config.hpp>
   9
  10 #if defined(BOOST_NO_FENV_H)
  11   #error This platform does not have a floating point environment
  12 #endif
  13
  14 #if !defined(BOOST_DETAIL_FENV_HPP)
  15 #define BOOST_DETAIL_FENV_HPP
  16
  17 /* If we're using clang + glibc, we have to get hacky.
  18  * See http://llvm.org/bugs/show_bug.cgi?id=6907 */
  19 #if defined(__clang__)       &&  (__clang_major__ < 3) &&    \
  20     defined(__GNU_LIBRARY__) && /* up to version 5 */ \
  21     defined(__GLIBC__) &&         /* version 6 + */ \
  22     !defined(_FENV_H)
  23   #define _FENV_H
  24
  25   #include <features.h>
  26   #include <bits/fenv.h>
  27
  28   extern "C" {
  29     extern int fegetexceptflag (fexcept_t*, int) __THROW;
  30     extern int fesetexceptflag (__const fexcept_t*, int) __THROW;
  31     extern int feclearexcept (int) __THROW;
  32     extern int feraiseexcept (int) __THROW;
  33     extern int fetestexcept (int) __THROW;
  34     extern int fegetround (void) __THROW;
  35     extern int fesetround (int) __THROW;
  36     extern int fegetenv (fenv_t*) __THROW;
  37     extern int fesetenv (__const fenv_t*) __THROW;
  38     extern int feupdateenv (__const fenv_t*) __THROW;
  39     extern int feholdexcept (fenv_t*) __THROW;
  40
  41     #ifdef __USE_GNU
  42       extern int feenableexcept (int) __THROW;
  43       extern int fedisableexcept (int) __THROW;
  44       extern int fegetexcept (void) __THROW;
  45     #endif
  46   }
  47
  48   namespace std { namespace tr1 {
  49     using ::fenv_t;
  50     using ::fexcept_t;
  51     using ::fegetexceptflag;
  52     using ::fesetexceptflag;
  53     using ::feclearexcept;
  54     using ::feraiseexcept;
  55     using ::fetestexcept;
  56     using ::fegetround;
  57     using ::fesetround;
  58     using ::fegetenv;
  59     using ::fesetenv;
  60     using ::feupdateenv;
  61     using ::feholdexcept;
  62   } }
  63
  64 #elif defined(__MINGW32__) && defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408
  65
  66   // MinGW (32-bit) has a bug in mingw32/bits/c++config.h, it does not define _GLIBCXX_HAVE_FENV_H,
  67   // which prevents the C fenv.h header contents to be included in the C++ wrapper header fenv.h. This is at least
  68   // the case with gcc 4.8.1 packages tested so far, up to 4.8.1-4. Note that there is no issue with
  69   // MinGW-w64.
  70   // To work around the bug we avoid including the C++ wrapper header and include the C header directly
  71   // and import all relevant symbols into std:: ourselves.
  72
  73   #include <../include/fenv.h>
  74
  75   namespace std {
  76     using ::fenv_t;
  77     using ::fexcept_t;
  78     using ::fegetexceptflag;
  79     using ::fesetexceptflag;
  80     using ::feclearexcept;
  81     using ::feraiseexcept;
  82     using ::fetestexcept;
  83     using ::fegetround;
  84     using ::fesetround;
  85     using ::fegetenv;
  86     using ::fesetenv;
  87     using ::feupdateenv;
  88     using ::feholdexcept;
  89   }
  90
  91 #else /* if we're not using GNU's C stdlib, fenv.h should work with clang */
  92
  93   #if defined(__SUNPRO_CC) /* lol suncc */
  94     #include <stdio.h>
  95   #endif
  96
  97   #include <fenv.h>
  98
  99 #endif
 100
 101 #endif /* BOOST_DETAIL_FENV_HPP */