BUG: fix for bug 4772, enable_language should now work on linux with correct flags

Modules/CMakeCInformation.cmake

@@ -32,10 +32,20 @@ ENDIF(CMAKE_SYSTEM_PROCESSOR)
 
 # load the system- and compiler specific files
 IF(CMAKE_C_COMPILER_ID)
-  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_C_COMPILER_ID}-C OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
+  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_C_COMPILER_ID}-C
+    OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
 ENDIF(CMAKE_C_COMPILER_ID)
 IF (NOT _INCLUDED_FILE)
-  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} OPTIONAL)
+  INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} 
+    OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
+ENDIF (NOT _INCLUDED_FILE)
+# some systems include the compiler information in the system file
+# and if this is the enable_language command then it may not have been
+# included at this point, or needs to be included again so that the
+# language_INIT variables are set correctly
+IF (NOT _INCLUDED_FILE)
+  INCLUDE(Platform/${CMAKE_SYSTEM_NAME} 
+    OPTIONAL RESULT_VARIABLE _INCLUDED_FILE)
 ENDIF (NOT _INCLUDED_FILE)
 
 

Modules/Platform/Linux.cmake

@@ -59,3 +59,5 @@ INCLUDE(Platform/UnixPaths)
 IF(EXISTS "/etc/debian_version")
   SET_PROPERTY(GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS FALSE)
 ENDIF(EXISTS "/etc/debian_version")
+# always include the gcc compiler information
+INCLUDE(Platform/gcc)