[OE-core] Using external source trees with OE-Core

[Andreas Oberritter]

On 24.02.2012 13:55, Richard Purdie wrote:
> Someone recently asked me about using external source trees with
> OE-Core. I was aware of srctree.bbclass in OE-Classic and did start
> looking at it but it has various elements I wasn't so keen on. I
> therefore wondered if I could improve upon it. I did start from that
> code base but came up with:
> 
> http://git.yoctoproject.org/cgit.cgi/poky-contrib/commit/?h=rpurdie/a0&id=ac8a54c18c33aaab6758c34a3d6093d3d3384cee
> [patch inline below]
> 
> which I've called externalsrc.bbclass since it behaves a bit
> differently. In particular, all the usual task targets are available.
> 
> As an example usage with the above patch applied:
> 
> cd ~
> tar -xvzf $DL_DIR/libfm-0.1.17.tar.gz
> (creates libfm-0.1.17 in my homedir)
> 
> edit libfm_0.1.17.bb and add:
> 
> inherit externalsrc
> S = "/home/richard/libfm-0.1.17"

Do I need to edit libfm_0.1.17.bb in-place, or can it be stored outside
my layers to be built with bitbake -b, for example?

Does S need to contain an absolute path, or could it be set to a path
relative to the location of the recipe?

It would be nice if it was possible to include bitbake recipes in the
source trees of my projects, which "just work".

I think this was possible with srctree.bbclass, though I never had it
working reliably. I think bitbake -cclean always raised errors.

Regards,
Andreas