[PATCH] data_smart: Ensure all possible overrides are cache including those with '_' in the name

[Richard Purdie <richard.purdie@linuxfoundation.org>]

Unfortunately we've been neglecting to pay the correct tributes to the
cookie monster and hence the datastore is malfunctioning.

Currently tributes are only paid on the last part of a variable after
the last "_" character. We need to split by *all* "_" characters since
an override may contain the character.

This fixes the code so the correct number of tributes are made. Paradoxically
parsing appears to be faster after this change.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/bitbake/lib/bb/data_smart.py b/bitbake/lib/bb/data_smart.py
index 9da86ce..27806f9 100644
--- a/bitbake/lib/bb/data_smart.py
+++ b/bitbake/lib/bb/data_smart.py
@@ -539,10 +539,15 @@ class DataSmart(MutableMapping):
     def _setvar_update_overrides(self, var):
         # aka pay the cookie monster
         override = var[var.rfind('_')+1:]
-        if len(override) > 0:
+        shortvar = var[:var.rfind('_')]
+        while override:
             if override not in self._seen_overrides:
                 self._seen_overrides[override] = set()
             self._seen_overrides[override].add( var )
+            override = None
+            if "_" in shortvar:
+                override = var[shortvar.rfind('_')+1:]
+                shortvar = var[:shortvar.rfind('_')]
 
     def getVar(self, var, expand=False, noweakdefault=False):
         return self.getVarFlag(var, "_content", expand, noweakdefault)