Index: cmd/gllgo/gllgo.go
===================================================================
--- cmd/gllgo/gllgo.go
+++ cmd/gllgo/gllgo.go
@@ -324,6 +324,16 @@
 		case strings.HasPrefix(args[0], "-fgo-relative-import-path="):
 			// TODO(pcc): Handle this.
 
+		case strings.HasPrefix(args[0], "-fstack-protector"):
+			// Not generally useful for Go, since the language provides
+			// memory-safe guarantees. Ignore.
+
+		case strings.HasPrefix(args[0], "-Wformat"):
+			// Purview of "go vet". Ignore.
+
+		case strings.HasPrefix(args[0], "-Werror="):
+			// Go doesn't do warnings. Ignore.
+
 		case args[0] == "-fload-plugin":
 			if len(args) == 1 {
 				return opts, errors.New("missing argument after '-fload-plugin'")