Merge branch 'fix-GNU-CXX-dialect-versions' into release

Modules/Compiler/GNU-CXX.cmake

@@ -11,7 +11,8 @@ else()
   endif()
 endif()
 
-if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.3)
+if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
+  # Supported since 4.3
   set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "-std=c++98")
   set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "-std=gnu++98")
 endif()
@@ -19,9 +20,7 @@ endif()
 if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
   set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-std=c++11")
   set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++11")
-elseif(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.3)
-  set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-std=c++0x")
-  set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++0x")
+  # 4.3 supports 0x variants
 endif()
 
 if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)