[poky] a new problem with sstate

[Richard Purdie]

On Wed, 2010-11-17 at 07:31 -0700, Tom Rini wrote:
> With old style packaged-staging we workaround this by doing:
> 
> # We want to be certain that the scene is set for us only after it's set for
> # our dependencies, to avoid problems with pstage package install order.
> do_setscene[deptask] = "do_setscene"
> 
> Can something similar be done for the sstate way of the world?

Unfortunately not. sstate differs as the code tries to be clever about
the dependencies and reverse walks the dependency tree. This means that
if:

A => B => C => D => E

where "=>" means "depends on" then sstate will try and install a sstate
package for A, then B, then C and *stop* once it finds a match.

This fixes one of the annoyances of packaged-staging where if you're
building an image and have all the ipks installed, it would still
install the cross toolchain.

Cheers,

Richard