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

[Paul D. DeRocco]

> > 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.

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.

-- 

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco at ix.netcom.com