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+/*============================================================================= |
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+ Copyright (c) 2010 Bryce Lelbach |
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+ |
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+ Distributed under the Boost Software License, Version 1.0. (See accompanying |
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+ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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+=============================================================================*/ |
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+ |
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+#include <boost/config.hpp> |
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+ |
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+#if defined(BOOST_NO_FENV_H) |
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+ #error This platform does not have a floating point environment |
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+#endif |
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+ |
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+#if !defined(BOOST_DETAIL_FENV_HPP) |
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+#define BOOST_DETAIL_FENV_HPP |
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+ |
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+/* If we're using clang + glibc, we have to get hacky. |
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+ * See http://llvm.org/bugs/show_bug.cgi?id=6907 */ |
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+#if defined(__clang__) && (__clang_major__ < 3) && \ |
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+ defined(__GNU_LIBRARY__) && /* up to version 5 */ \ |
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+ defined(__GLIBC__) && /* version 6 + */ \ |
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+ !defined(_FENV_H) |
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+ #define _FENV_H |
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+ |
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+ #include <features.h> |
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+ #include <bits/fenv.h> |
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+ |
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+ extern "C" {
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+ extern int fegetexceptflag (fexcept_t*, int) __THROW; |
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+ extern int fesetexceptflag (__const fexcept_t*, int) __THROW; |
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+ extern int feclearexcept (int) __THROW; |
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+ extern int feraiseexcept (int) __THROW; |
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+ extern int fetestexcept (int) __THROW; |
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+ extern int fegetround (void) __THROW; |
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+ extern int fesetround (int) __THROW; |
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+ extern int fegetenv (fenv_t*) __THROW; |
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+ extern int fesetenv (__const fenv_t*) __THROW; |
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+ extern int feupdateenv (__const fenv_t*) __THROW; |
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+ extern int feholdexcept (fenv_t*) __THROW; |
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+ |
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+ #ifdef __USE_GNU |
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+ extern int feenableexcept (int) __THROW; |
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+ extern int fedisableexcept (int) __THROW; |
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+ extern int fegetexcept (void) __THROW; |
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+ #endif |
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+ } |
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+ |
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+ namespace std { namespace tr1 {
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+ using ::fenv_t; |
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+ using ::fexcept_t; |
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+ using ::fegetexceptflag; |
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+ using ::fesetexceptflag; |
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+ using ::feclearexcept; |
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+ using ::feraiseexcept; |
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+ using ::fetestexcept; |
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+ using ::fegetround; |
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+ using ::fesetround; |
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+ using ::fegetenv; |
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+ using ::fesetenv; |
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+ using ::feupdateenv; |
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+ using ::feholdexcept; |
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+ } } |
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+ |
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+#elif defined(__MINGW32__) && defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 |
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+ |
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+ // MinGW (32-bit) has a bug in mingw32/bits/c++config.h, it does not define _GLIBCXX_HAVE_FENV_H, |
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+ // which prevents the C fenv.h header contents to be included in the C++ wrapper header fenv.h. This is at least |
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+ // the case with gcc 4.8.1 packages tested so far, up to 4.8.1-4. Note that there is no issue with |
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+ // MinGW-w64. |
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+ // To work around the bug we avoid including the C++ wrapper header and include the C header directly |
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+ // and import all relevant symbols into std:: ourselves. |
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+ |
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+ #include <../include/fenv.h> |
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+ |
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+ namespace std {
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+ using ::fenv_t; |
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+ using ::fexcept_t; |
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+ using ::fegetexceptflag; |
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+ using ::fesetexceptflag; |
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+ using ::feclearexcept; |
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+ using ::feraiseexcept; |
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+ using ::fetestexcept; |
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+ using ::fegetround; |
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+ using ::fesetround; |
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+ using ::fegetenv; |
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+ using ::fesetenv; |
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+ using ::feupdateenv; |
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+ using ::feholdexcept; |
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+ } |
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+ |
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+#else /* if we're not using GNU's C stdlib, fenv.h should work with clang */ |
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+ |
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+ #if defined(__SUNPRO_CC) /* lol suncc */ |
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+ #include <stdio.h> |
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+ #endif |
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+ |
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+ #include <fenv.h> |
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+ |
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+#endif |
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+ |
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+#endif /* BOOST_DETAIL_FENV_HPP */ |
