[OE-core] [RFC PATCH v5 1/2] base.bbclass: Add support to EXTRA_DISTRO_FEATURES

[Richard Purdie]

On Fri, 2013-08-23 at 12:11 -0300, Otavio Salvador wrote:
> On Fri, Aug 23, 2013 at 11:59 AM, Richard Purdie
> <richard.purdie at linuxfoundation.org> wrote:
> > On Fri, 2013-08-23 at 11:48 -0300, Otavio Salvador wrote:
> >> This allow the addition and removal of distro features easily. To add
> >> a feature, use:
> >>
> >>  EXTRA_DISTRO_FEATURES += "wayland"
> >>
> >> and to remove, use '~' prefix, as:
> >>
> >>  EXTRA_DISTRO_FEATURES += "~x11"
> >>
> >> This code has been mostly copied from Mentor Graphics public layer but
> >> changed the variable name for a more descriptive name. The original
> >> code can be seen at user_feature.bbclass at:
> >>
> >>  http://git.yoctoproject.org/cgit/cgit.cgi/meta-mentor
> >>
> >> Signed-off-by: Otavio Salvador <otavio at ossystems.com.br>
> >
> > I discussed this with Otavio. My personal view is that we should hold
> > off this right now. The removal issues he ran into with poky have been
> > addressed in other ways so there is less of an immediate issue.
> >
> > The better fix for this kind of problem is -=/=- or more likely _remove
> > override support in bitbake. I did propose a _remove patch a while back
> > but Chris has some valid concerns about it, I don't remember the details
> > offhand. I'd much rather we focused on fixing that and getting that
> > merged than trying to add this functionality to every variable.
> 
> Chris, do you know the problems Richard's patch has? I can take a look
> and try to fix it so we can get this in for 1.5.

One more thing, we need to grep the existing metadata and change any
existing _remove in variable names. I seem to remember finding one
somewhere.

Cheers,

Richard