Merge branch 'feature/os-auto-detect' into develop

Jamroot.jam

@@ -162,9 +162,7 @@ local unix_os = [ set.difference [ feature.values <target-os> ] : windows vms ]
 exe b2
     :   $(b2_src)
         python
-    :   <target-os>windows:<define>NT
-        <target-os>windows:<source>$(b2_src_nt)
-        <target-os>vms:<define>VMS
+    :   <target-os>windows:<source>$(b2_src_nt)
         <target-os>vms:<source>$(b2_src_vms)
         <target-os>$(unix_os):<source>$(b2_src_unix)
         <dependency>jamgram.cpp

src/engine/build.bat

@@ -183,7 +183,7 @@ set B2_SOURCES=%B2_SOURCES% modules/regex.cpp
 set B2_SOURCES=%B2_SOURCES% modules/sequence.cpp
 set B2_SOURCES=%B2_SOURCES% modules/set.cpp
 
-set B2_CXXFLAGS=%B2_CXXFLAGS% -DNT -DNDEBUG
+set B2_CXXFLAGS=%B2_CXXFLAGS% -DNDEBUG
 
 @echo ON
 %B2_CXX% %CXXFLAGS% %B2_CXXFLAGS% %B2_SOURCES% %B2_CXX_LINK%

src/engine/build.sh

@@ -170,7 +170,7 @@ case $B2_TOOLSET in
         if test -r ${B2_TOOLSET_ROOT}bin/gcc ; then
             export PATH=${B2_TOOLSET_ROOT}bin:$PATH
         fi
-        B2_CXX="${CXX} -x c++ -DNT"
+        B2_CXX="${CXX} -x c++ -std=c++11"
         B2_CXXFLAGS_RELEASE="-O2 -s"
         B2_CXXFLAGS_DEBUG="-O0 -g"
         B2_OS="NT"

src/engine/config.h

@@ -17,4 +17,18 @@ http://www.boost.org/LICENSE_1_0.txt)
 #define OPT_FIX_TARGET_VARIABLES_EXT 1
 #define OPT_IMPROVED_PATIENCE_EXT 1
 
+// Autodetect various operating systems..
+
+#if defined(_WIN32) || defined(_WIN64) || \
+    defined(__WIN32__) || defined(__TOS_WIN__) || \
+    defined(__WINDOWS__)
+    #define NT 1
+#endif
+
+#if defined(__VMS) || defined(__VMS_VER)
+    #if !defined(VMS)
+        #define VMS 1
+    #endif
+#endif
+
 #endif