Changed: Use CPP11 everywhere if supported

--HG--
branch : develop

code/CMakeModules/PCHSupport.cmake

@@ -209,8 +209,8 @@ MACRO(PCH_SET_COMPILE_FLAGS _target)
     ENDIF()
   ENDIF()
 
-  IF(USE_CPP0X AND gcc_compiler_version GREATER "6.2.0")
-    LIST(APPEND _FLAGS "-std=gnu++11")
+  IF(CMAKE_CXX11_EXTENSION_COMPILE_OPTION)
+    LIST(APPEND _FLAGS ${CMAKE_CXX11_EXTENSION_COMPILE_OPTION})
   ENDIF()
 
   # Format definitions

code/CMakeModules/nel.cmake

@@ -874,7 +874,9 @@ MACRO(NL_SETUP_BUILD)
     ENDIF()
 
     # use c++0x standard to use std::unique_ptr and std::shared_ptr
-    SET(PLATFORM_CXXFLAGS "${PLATFORM_CXXFLAGS} -std=c++0x")
+    IF(CMAKE_CXX11_EXTENSION_COMPILE_OPTION)
+      SET(PLATFORM_CXXFLAGS "${PLATFORM_CXXFLAGS} ${CMAKE_CXX11_EXTENSION_COMPILE_OPTION}")
+    ENDIF()
 
     ADD_PLATFORM_FLAGS("-D_REENTRANT")