ENH: A type of target was added for representing GENERATED_CODE

Source/cmTarget.h

@@ -55,7 +55,8 @@ class cmTarget
 {
 public:
   enum TargetType { EXECUTABLE, WIN32_EXECUTABLE, STATIC_LIBRARY,
-                    SHARED_LIBRARY, MODULE_LIBRARY, UTILITY, INSTALL_FILES, INSTALL_PROGRAMS };
+                    SHARED_LIBRARY, MODULE_LIBRARY, UTILITY, INSTALL_FILES, 
+                    INSTALL_PROGRAMS, GENERATED_CODE };
 
   /**
    * Return the type of target.