[oe] Trying to resolve build-time cyclic dependency between packages

[Khem Raj]

> On Jul 29, 2015, at 6:26 AM, Boszormenyi Zoltan <zboszor at pr.hu> wrote:
> 
> Hi,
> 
> I have a customized Mesa 10.6.3 package recipe which depends on libva
> to be able to build its mesa-va-driver subpackage, but libva also depends
> on Mesa to support GLX.
> 
> Previously, I simply created a libva-noglx package that builds libva
> with --disable-glx that Mesa depend on and the "real" libva package can
> depend on Mesa.
> 
> But since I also have to produce an SDK image with all the *-dev packages,
> creating such an initial image with bitbake fails because of a conflict
> in the dependency chain: libva-dev -> mesa-dev -> libva-noglx-dev.
> 

since libva-noglx is sort of a bootstrap package, you could empty/delete out the content
its puts into -dev packages and conflict will be gone. Other option is that you share
the content of -dev package in exclusive manner between libva and libva-noglx such
that they don’t package duplicate files

> I have come up with the attached bbclass (based on Yocto 1.6) that
> now Mesa can inherit and that patches the RDEPENDS / RRECOMMENDS
> variables according to externally set variables. The comment at
> the beginning of the file explains how to use it.
> 
> This pushes the cyclic dependency to opkg which happily breaks it and
> installs both libva* and *mesa* packages properly. Creating the initial
> image via bitbake works now.
> 
> Comments?
> 
> Best regards,
> Zoltán Böszörményi
> 
> <cyclic-deps.bbclass>--
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