[oe] How can I make recipes conditionally enabled?

[Martin Jansa]

On Tue, Aug 27, 2013 at 03:56:40PM +0200, Erik Botö wrote:
> Hi,
> 
> On Tue, Aug 27, 2013 at 9:54 AM, Martin Jansa <martin.jansa at gmail.com> wrote:
> > On Tue, Aug 27, 2013 at 09:12:15AM +0200, Carlos Rafael Giani wrote:
> >> Hello,
> >>
> >> I have a question about a problem I've had several times in the past:
> >>
> >> if I write a layer, and add .bbappends, then the layers with the
> >> corresponding .bb files become hard dependencies.
> >> But lets say I want to write a BSP layer, and I add some machine
> >> specific Qt5 patches. Now everybody who wants to use
> >> my layer must also include meta-qt5, even when they don't really want to
> >> use Qt5 anywhere. This is made even worse
> >> if I have a dependency on meta-oe, which itself brings in a lot of
> >> modifications.
> >>
> >> In short, I'd like to be able to make .bbappends and .bb files dependend
> >> on whether or not a layer is available. The hard
> >> dependency is fine if it concerns things that are essential in my layer.
> >> But if its about optional things, it shouldn't cause
> >> a build failure.
> >
> > BB_DANGLINGAPPENDS_WARNONLY is the magic word.
> 
> I also saw some nice use of inspecting BBFILE_COLLECTIONS in the layer
> configuration done by Mentor, see
> http://git.yoctoproject.org/cgit/cgit.cgi/meta-mentor/tree/conf/layer.conf#n9
> 
> Then you would place the files you only want to enable for e.g.
> meta-qt5 in a qt5-layer directory in your layer. Those files would
> then just be used if BBFILE_COLLECTIONS contains qt5-layer, which is
> only the case if you have added meta-qt5.
> 
> I know meta-fsl-arm uses this for meta-qt5 bbappends.

Something similar was also used in meta-systemd layer (you need to check
older revision than 8b465f791a5ef3d9ef138a206c6fb9c3bbcb55b1)

-- 
Martin 'JaMa' Jansa     jabber: Martin.Jansa at gmail.com
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