[OE-core] [PATCH] base.bbclass: Add support to EXTRA_DISTRO_FEATURES

[Phil Blundell]

On Tue, 2013-07-30 at 09:00 -0300, Otavio Salvador wrote:
> To make this, we cannot reuse Poky distro for example as it
> /unconditionally/ appends to DISTRO_FEATURES. Besides it is easier for
> test to be able to override it using local.conf. For products I agree
> we'll end adding a distro to make it reprodicable but for development
> stage this trick makes life much easier.

Surely for one-off tests you can just write out the whole intended value
of DISTRO_FEATURES in your local.conf.  It doesn't seem as though this
variable is unwieldy enough that it really needs mechanical handling.

As for poky appending to DISTRO_FEATURES rather than just setting it,
that sounds like it's arguably a bug in poky and you should perhaps take
it up with those guys.  Of course, they might take the view that poky
itself is meant to be determining what DISTRO_FEATURES it wants and they
don't want to support or encourage random frobbing of flags by third
parties, and I think that'd be an understandable position.

>We call it and /finalize/ the database so it has _append/_prepend
>resolved before mangling the list.

That seems a bit unwholesome in itself.  Are you sure there are no
potential bad consequences from calling finalize() there?

p.