Index: src/Common/SemanticError.h
===================================================================
--- src/Common/SemanticError.h	(revision 679e6444520adec6880c7a60221345ec1ab3458a)
+++ src/Common/SemanticError.h	(revision 7e288c44c1d1885b376034d85b2c51bdc9f5088d)
@@ -58,4 +58,5 @@
 	{"aggregate-forward-decl" , "forward declaration of nested aggregate: %s"  , Severity::Warn},
 	{"superfluous-decl"       , "declaration does not allocate storage: %s"    , Severity::Warn},
+	{"gcc-attributes"         , "invalid attribute: %s"                        , Severity::Warn},
 };
 
@@ -66,4 +67,5 @@
 	AggrForwardDecl,
 	SuperfluousDecl,
+	GccAttributes,
 	NUMBER_OF_WARNINGS, // This MUST be the last warning
 };