Implement enumeration type

gcc/elna-diagnostic.cc

@@ -78,7 +78,7 @@ namespace elna::gcc
         {
             return "()";
         }
-        else if (is_pointer_type(unqualified_type))
+        else if (POINTER_TYPE_P(unqualified_type))
         {
             tree pointer_target_type = TREE_TYPE(type);
 
@@ -129,6 +129,10 @@ namespace elna::gcc
         {
             return print_aggregate_name(unqualified_type, "union");
         }
+        else if (TREE_CODE(type) == ENUMERAL_TYPE)
+        {
+            return print_aggregate_name(unqualified_type, "enumeration");
+        }
         else
         {
             return "<<unknown-type>>";