prevents a call to ccache
--- a/python/mozbuild/mozbuild/controller/building.py
+++ b/python/mozbuild/mozbuild/controller/building.py
@@ -586,6 +586,7 @@
             )
 
     def ccache_stats(self):
+        return None
         ccache_stats = None
 
         ccache = mozfile.which("ccache")