Added BOOST_HAS_FENV_H detection to Boost.Config (if this macro is defined, then

the standard library/platform provide a POSIX compliant implementation of fenv.h).



[SVN r66693]

include/boost/config/stdlib/libstdcpp3.hpp

@@ -54,6 +54,12 @@
 #  define BOOST_HAS_THREADS
 #endif
 
+#if !defined(CYGWIN) && (defined(unix) || defined(__unix) || defined(__unix__))
+#  include <unistd.h>
+#  if defined(_POSIX_VERSION) || defined(_XOPEN_VERSION)
+#     define BOOST_HAS_FENV_H
+#  endif
+#endif
 
 #if !defined(_GLIBCPP_USE_LONG_LONG) \
     && !defined(_GLIBCXX_USE_LONG_LONG)\

include/boost/config/stdlib/sgi.hpp

@@ -40,6 +40,14 @@
 #  define BOOST_NO_STRINGSTREAM
 #endif
 
+#if !defined(CYGWIN) && (defined(unix) || defined(__unix) || defined(__unix__))
+#  include <unistd.h>
+#  if defined(_POSIX_VERSION) || defined(_XOPEN_VERSION)
+#     define BOOST_HAS_FENV_H
+#  endif
+#endif
+
+
 //
 // Assume no std::locale without own iostreams (this may be an
 // incorrect assumption in some cases):

include/boost/config/stdlib/stlport.hpp

@@ -16,6 +16,13 @@
 #  endif
 #endif
 
+#if !defined(CYGWIN) && (defined(unix) || defined(__unix) || defined(__unix__))
+#  include <unistd.h>
+#  if defined(_POSIX_VERSION) || defined(_XOPEN_VERSION)
+#     define BOOST_HAS_FENV_H
+#  endif
+#endif
+
 //
 // __STL_STATIC_CONST_INIT_BUG implies BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
 // for versions prior to 4.1(beta)

include/boost/config/stdlib/vacpp.hpp

@@ -12,6 +12,13 @@
 #define BOOST_HAS_MACRO_USE_FACET
 #define BOOST_NO_STD_MESSAGES
 
+#if !defined(CYGWIN) && (defined(unix) || defined(__unix) || defined(__unix__))
+#  include <unistd.h>
+#  if defined(_POSIX_VERSION) || defined(_XOPEN_VERSION)
+#     define BOOST_HAS_FENV_H
+#  endif
+#endif
+
 //  C++0x headers not yet implemented
 //
 #  define BOOST_NO_0X_HDR_ARRAY