bitbake: data_smart: When considering OVERRIDE dependencies, do so recursively

Sadly its not enough to consider the dependencies of OVERRIDES, we
need to resolve their dependencies and so on recursively. If we don't
do this, some variable can be changed and the resulting data store is
incorrect.

(Bitbake rev: 82143ac064d391300e762ba7520ef1f8df18b574)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/data_smart.py

@@ -530,7 +530,13 @@ class DataSmart(MutableMapping):
             self._setvar_update_overridevars(var, value)
 
     def _setvar_update_overridevars(self, var, value):
-        self.overridevars.update(self.expandWithRefs(value, var).references)
+        new = self.expandWithRefs(value, var).references
+        while not new.issubset(self.overridevars):
+            nextnew = set()
+            self.overridevars.update(new)
+            for i in new:
+                nextnew.update(self.expandWithRefs(self.getVar(i, True), i).references)
+            new = nextnew
         self.internal_finalize(True)
 
     def _setvar_update_overrides(self, var, **loginfo):