Squashed 'third_party/boostorg/detail/' content from commit 824721a
Change-Id: Id58ef7955aa7ca41b9e6b3f41ee1b0ad900985ea
git-subtree-dir: third_party/boostorg/detail
git-subtree-split: 824721a7533de893338ed5bbc8e8d9f4fb1ad716
diff --git a/include/boost/detail/fenv.hpp b/include/boost/detail/fenv.hpp
new file mode 100644
index 0000000..b268f5c
--- /dev/null
+++ b/include/boost/detail/fenv.hpp
@@ -0,0 +1,101 @@
+/*=============================================================================
+ Copyright (c) 2010 Bryce Lelbach
+
+ Distributed under the Boost Software License, Version 1.0. (See accompanying
+ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+
+#include <boost/config.hpp>
+
+#if defined(BOOST_NO_FENV_H)
+ #error This platform does not have a floating point environment
+#endif
+
+#if !defined(BOOST_DETAIL_FENV_HPP)
+#define BOOST_DETAIL_FENV_HPP
+
+/* If we're using clang + glibc, we have to get hacky.
+ * See http://llvm.org/bugs/show_bug.cgi?id=6907 */
+#if defined(__clang__) && (__clang_major__ < 3) && \
+ defined(__GNU_LIBRARY__) && /* up to version 5 */ \
+ defined(__GLIBC__) && /* version 6 + */ \
+ !defined(_FENV_H)
+ #define _FENV_H
+
+ #include <features.h>
+ #include <bits/fenv.h>
+
+ extern "C" {
+ extern int fegetexceptflag (fexcept_t*, int) __THROW;
+ extern int fesetexceptflag (__const fexcept_t*, int) __THROW;
+ extern int feclearexcept (int) __THROW;
+ extern int feraiseexcept (int) __THROW;
+ extern int fetestexcept (int) __THROW;
+ extern int fegetround (void) __THROW;
+ extern int fesetround (int) __THROW;
+ extern int fegetenv (fenv_t*) __THROW;
+ extern int fesetenv (__const fenv_t*) __THROW;
+ extern int feupdateenv (__const fenv_t*) __THROW;
+ extern int feholdexcept (fenv_t*) __THROW;
+
+ #ifdef __USE_GNU
+ extern int feenableexcept (int) __THROW;
+ extern int fedisableexcept (int) __THROW;
+ extern int fegetexcept (void) __THROW;
+ #endif
+ }
+
+ namespace std { namespace tr1 {
+ using ::fenv_t;
+ using ::fexcept_t;
+ using ::fegetexceptflag;
+ using ::fesetexceptflag;
+ using ::feclearexcept;
+ using ::feraiseexcept;
+ using ::fetestexcept;
+ using ::fegetround;
+ using ::fesetround;
+ using ::fegetenv;
+ using ::fesetenv;
+ using ::feupdateenv;
+ using ::feholdexcept;
+ } }
+
+#elif defined(__MINGW32__) && defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408
+
+ // MinGW (32-bit) has a bug in mingw32/bits/c++config.h, it does not define _GLIBCXX_HAVE_FENV_H,
+ // which prevents the C fenv.h header contents to be included in the C++ wrapper header fenv.h. This is at least
+ // the case with gcc 4.8.1 packages tested so far, up to 4.8.1-4. Note that there is no issue with
+ // MinGW-w64.
+ // To work around the bug we avoid including the C++ wrapper header and include the C header directly
+ // and import all relevant symbols into std:: ourselves.
+
+ #include <../include/fenv.h>
+
+ namespace std {
+ using ::fenv_t;
+ using ::fexcept_t;
+ using ::fegetexceptflag;
+ using ::fesetexceptflag;
+ using ::feclearexcept;
+ using ::feraiseexcept;
+ using ::fetestexcept;
+ using ::fegetround;
+ using ::fesetround;
+ using ::fegetenv;
+ using ::fesetenv;
+ using ::feupdateenv;
+ using ::feholdexcept;
+ }
+
+#else /* if we're not using GNU's C stdlib, fenv.h should work with clang */
+
+ #if defined(__SUNPRO_CC) /* lol suncc */
+ #include <stdio.h>
+ #endif
+
+ #include <fenv.h>
+
+#endif
+
+#endif /* BOOST_DETAIL_FENV_HPP */