[OE-core] How to force BitBake to track dependency to METADATA_REVISION?

[Kucharczyk, Bartlomiej (Nokia - PL/Wroclaw)]

> The problem is probably the cache. It has no knowledge of when it needs
> to reparse to see if this value has changed. If you set BB_DONT_CACHE =
> "1" in the recipe, does that help?

Yes! That helps.
Thanks for those hints!

What BB_DONT_CACHE does exactly? I found it undocumented. ;-)
I understand this is config cache, not the 'sstate cache'.

Bartek