Merge Boost.Config changes from Trunk.

[SVN r67522]

include/boost/config/stdlib/dinkumware.hpp

@@ -107,6 +107,7 @@
 #  define BOOST_NO_0X_HDR_UNORDERED_SET
 #  define BOOST_NO_0X_HDR_TUPLE
 #  define BOOST_NO_0X_HDR_TYPEINDEX
+#  define BOOST_NO_NUMERIC_LIMITS_LOWEST
 #endif
 
 #if !defined(_HAS_TR1_IMPORTS) && !defined(BOOST_NO_0X_HDR_TUPLE)
@@ -125,7 +126,6 @@
 #  define BOOST_NO_0X_HDR_MUTEX
 #  define BOOST_NO_0X_HDR_RATIO
 #  define BOOST_NO_0X_HDR_THREAD
-#  define BOOST_NO_NUMERIC_LIMITS_LOWEST
 
 #ifdef _CPPLIB_VER
 #  define BOOST_DINKUMWARE_STDLIB _CPPLIB_VER

include/boost/config/stdlib/libstdcpp3.hpp

@@ -54,7 +54,6 @@
 #  define BOOST_HAS_THREADS
 #endif
 
-
 #if !defined(_GLIBCPP_USE_LONG_LONG) \
     && !defined(_GLIBCXX_USE_LONG_LONG)\
     && defined(BOOST_HAS_LONG_LONG)
@@ -63,6 +62,16 @@
 #  undef BOOST_HAS_LONG_LONG
 #endif
 
+// Apple doesn't seem to reliably defined a *unix* macro
+#if !defined(CYGWIN) && (  defined(__unix__)  \
+                        || defined(__unix)    \
+                        || defined(unix)      \
+                        || defined(__APPLE__) \
+                        || defined(__APPLE)   \
+                        || defined(APPLE))
+#  include <unistd.h>
+#endif
+
 #if defined(__GLIBCXX__) || (defined(__GLIBCPP__) && __GLIBCPP__>=20020514) // GCC >= 3.1.0
 #  define BOOST_STD_EXTENSION_NAMESPACE __gnu_cxx
 #  define BOOST_HAS_SLIST

include/boost/config/stdlib/sgi.hpp

@@ -40,6 +40,17 @@
 #  define BOOST_NO_STRINGSTREAM
 #endif
 
+// Apple doesn't seem to reliably defined a *unix* macro
+#if !defined(CYGWIN) && (  defined(__unix__)  \
+                        || defined(__unix)    \
+                        || defined(unix)      \
+                        || defined(__APPLE__) \
+                        || defined(__APPLE)   \
+                        || defined(APPLE))
+#  include <unistd.h>
+#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 +16,16 @@
 #  endif
 #endif
 
+// Apple doesn't seem to reliably defined a *unix* macro
+#if !defined(CYGWIN) && (  defined(__unix__)  \
+                        || defined(__unix)    \
+                        || defined(unix)      \
+                        || defined(__APPLE__) \
+                        || defined(__APPLE)   \
+                        || defined(APPLE))
+#  include <unistd.h>
+#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 +12,16 @@
 #define BOOST_HAS_MACRO_USE_FACET
 #define BOOST_NO_STD_MESSAGES
 
+// Apple doesn't seem to reliably defined a *unix* macro
+#if !defined(CYGWIN) && (  defined(__unix__)  \
+                        || defined(__unix)    \
+                        || defined(unix)      \
+                        || defined(__APPLE__) \
+                        || defined(__APPLE)   \
+                        || defined(APPLE))
+#  include <unistd.h>
+#endif
+
 //  C++0x headers not yet implemented
 //
 #  define BOOST_NO_0X_HDR_ARRAY