diff --git a/cc/config/clang.go b/cc/config/clang.go
index 36afc68..186d790 100644
--- a/cc/config/clang.go
+++ b/cc/config/clang.go
@@ -93,8 +93,10 @@
 })
 
 var ClangLibToolingUnknownCflags = []string{
+	// Remove -flto and other flto dependent flags.
 	"-flto*",
 	"-fsanitize*",
+	"-fwhole-program-vtables",
 }
 
 func init() {