[OE-core] lib/oe/sstatesig: Ensure packagegroups don't continually rebuild

[Richard Purdie]

On Thu, 2013-11-07 at 13:58 -0200, Otavio Salvador wrote:
> On Wed, Nov 6, 2013 at 9:42 PM, Richard Purdie
> <richard.purdie at linuxfoundation.org> wrote:
> > On Wed, 2013-11-06 at 16:51 -0200, Otavio Salvador wrote:
> >> On Tue, Nov 5, 2013 at 8:15 PM, Richard Purdie
> >> <richard.purdie at linuxfoundation.org> wrote:
> >> > packagegroups are allarch and shouldn't change depending on the target
> >> > or machine selected. In general they should have good stable namespaces
> >> > for their dependencies. As such we can exclude them from rebuilding when
> >> > dependency checksums change.
> >> >
> >> > Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
> >>
> >> What about machine-base and core-boot? this may change depending on machine.
> >
> > Those already get marked as machine specific. I'd not expect
> > dependencies to be changing package names there for example so I'm not
> > sure this is an issue.
> 
> In:
> 
> +    def isPackageGroup(fn):
> +        inherits = " ".join(dataCache.inherits[fn])
> +        return "packagegroup.bbclass" in inherits
> 
> We must check PACKAGE_ARCH, no?

No. The fact they're marked as MACHINE_ARCH ensures they change when
they need to, we don't need sstate to do that as well.

Cheers,

Richard