[OE-core] more pedantry -- looking to clarify layers definition, BBPATH, BBFILES, etc.

[Martin Jansa]

On Mon, Jul 09, 2012 at 11:23:32AM +0200, Martin Jansa wrote:
> On Sun, Jul 08, 2012 at 01:59:48PM -0400, Robert P. J. Day wrote:
> > 
> >   (most of this is sort of self-evident but it's not documented as
> > well as it could be so i just want to make sure i have it exactly
> > right.)
> > 
> >   snippets of some layer.conf files:
> > 
> > oe-core:
> > 
> > BBPATH .= ":${LAYERDIR}"
> > BBFILES += "${LAYERDIR}/recipes-*/*/*.bb"
> > 
> > meta-hob:
> > 
> > BBPATH := "${BBPATH}:${LAYERDIR}"
> > BBFILES := "${BBFILES} ${LAYERDIR}/recipes-*/*/*.bb"
> > 
> > meta-yocto:
> > 
> > BBPATH := "${LAYERDIR}:${BBPATH}"
> > BBFILES := "${BBFILES} ${LAYERDIR}/recipes-*/*/*.bb \
> >             ${LAYERDIR}/recipes-*/*/*.bbappend"
> > 
> >   note how meta-hob *appends* itself to BBPATH, while meta-yocto
> > *prepends* itself.  is there no possibility that this will cause some
> > confusion based on how BBPATH is used to resolve the location of class
> > or conf files?  i realize you should try to avoid that sort of
> > conflict but it still seems possible that someone might choose the
> > names of some files badly and the unpredictable ordering in BBPATH
> > will cause grief, no?
> 
> Yes, order is important and prepending makes it harder for person
> writting bblayers.conf to influence it:
> 
> http://lists.linuxtogo.org/pipermail/openembedded-core/2012-July/024914.html
> 
> http://lists.linuxtogo.org/pipermail/openembedded-core/2012-February/018115.html:
> BBFILE_PRIORITY controls recipe priority. BBLAYERS order controls
> BBPATH order which in turn controls bbclass/config priority, as things
> stand today.
> 
> See also this thread for more details:
> http://lists.linuxtogo.org/pipermail/openembedded-devel/2011-May/032387.html

And this one
http://lists.linuxtogo.org/pipermail/openembedded-core/2011-August/007387.html

Cheers,

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