[oe] How does oe handle rebuilds?

[Charles Manning]

I find I often have problems when using oe that changing a recipe does
not result in dependent packages being rebuilt. A bit of Googling
suggests that many experience this issue and take manual steps to
force rebuilding.

For example, changing the kernel requires rebuilding various libraries
(tslib etc) and rebuilding the image.

1.Should oe be able to handle that automatically or is this oe's
"killer defect" (ie. opposite of "killer feature").
2. Is there something missing in recipes to show the correct dependencies?
3. What is the best way to manage these stale dependencies?

Thanks

Charles