diff --git a/build_tools/find_missing_support_level b/build_tools/find_missing_support_level
new file mode 100755
index 0000000000..dacc3d6fcf
--- /dev/null
+++ b/build_tools/find_missing_support_level
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+grep -r -L -e "support_level" * | grep -e "\.c$" -e "\.cxx$" | sort