[yocto] How to find the source of a variable value?

[Chris Larson]

On Mon, Sep 16, 2013 at 11:34 AM, Paul D. DeRocco <pderocco at ix.netcom.com>wrote:

> > > On Mon, Sep 16, 2013 at 10:02 AM, Paul D. DeRocco
> > > <pderocco at ix.netcom.com> wrote:
> > >
> > > This image recipe has some Python that complains
> > > because "x11" is in
> > > DISTRO_FEATURES. How do I find out where that "x11" is
> > > coming from? This
> > > is a Gumstix build, so I suspect it's indirectly
> > > related to my selecting
> > > "overo" as the MACHINE, because otherwise building this
> > > image would never
> > > have worked with the plain Yocto meta-data. So how do I
> > > track this down?
>
> > From: Chris Larson
> >
> > Assuming you're using recent metadata, bitbake -e somerecipe
> > will show you this.
>
> This isn't working for me. The image I'm trying to build is
> core-image-gtk-directfb. The recipe is in meta/recipes-graphics/images. If
> I just type "bitbake -k core-image-gtk-directfb", I get two errors:
>
> ERROR: Nothing PROVIDES 'core-image-gtk-directfb'
> ERROR: core-image-gtk-directfb was skipped: FEATURE "x11" is in
> DISTRO_FEATURES, Please remove "x11" from DISTRO_FEATURES, use
> "gtk-directfb" instead of it
>
> I don't understand the "Nothing PROVIDES" error. Doesn't a recipe called
> x.bb PROVIDE x by default? The second error comes from the bit of Python
> in that recipe, which at least proves that it's reading that recipe.
>

It does, but in this case it 'skips' itself, telling bitbake it's not
available to be built given the current context, hence isn't provided by
that recipe.

If I type "bitbake -e core-image-gtk-directfb", I just get the first
> error. This happens almost instantly, before it's done any real work, so
> I'm not getting any further output.


It's raising that error to bitbake in the parsing process, unfortunately,
which means it can't be used as a target even for informational purposes
like -e.

To look at a global variable like DISTRO_FEATURES, use bitbake -e without
any arguments.
-- 
Christopher Larson
clarson at kergoth dot com
Founder - BitBake, OpenEmbedded, OpenZaurus
Maintainer - Tslib
Senior Software Engineer, Mentor Graphics
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