[oe] Preferred handling of pkg-config in cross compile environments.

[Paul Menzel]

Am Sonntag, den 10.10.2010, 10:09 -0700 schrieb Chris Larson:
> On Sun, Oct 10, 2010 at 10:05 AM, Paul Menzel <
> paulepanter at users.sourceforge.net> wrote:
> 
> > I stumbled upon several programs who call plain `pkg-config` [1][2].
> >
> > Is the following statement correct?
> >
> > To be able to cross compile programs correctly, the build files are
> > supposed to use the environment variable `PKG_CONFIG` and only call
> > pkg-config directly if `PKG_CONFIG` is empty.
> >
> >        if test -z "${PKG_CONFIG}"; then
> >            PKG_CONFIG="pkg-config"
> >
> > If you agree I would note that somewhere in the Wiki, so that upstream
> > can be pointed to some documentation and search the Web will result in
> > some useful results.
> >
> 
> Can you explain why running just 'pkg-config' is a problem?  It seems to
> work just fine..

Do you have a minimal build host. Some problems do not surface if some
files are installed locally on the build host.

Please take a look at [2] I forgot to add in my original message. I have
no clue why the staged(?) pkg-config behaves differently than the local
installed one. Does it search the paths in a different order?

Secondly I am having a similar problem with `gobject-introspection`
where [1]

	gir/Makefile.am:GLIB_INCLUDEDIR=$(shell pkg-config --variable=includedir glib-2.0)/glib-2.0
	gir/Makefile.am:GLIB_LIBDIR=$(shell pkg-config --variable=libdir glib-2.0)

returns the wrong path.

        Making all in gir
        make[2]: Entering directory `/oe/build-minimal-libc/minimal-dev/work/armv7a-oe-linux-gnueabi/gobject-introspection-0.9.12-r0/gobject-introspection-0.9.12/gir'
        make[2]: *** No rule to make target `/usr/lib/glib-2.0/include/glibconfig.h', needed by `GLib-2.0.gir'.  Stop.
        make[2]: Leaving directory `/oe/build-minimal-libc/minimal-dev/work/armv7a-oe-linux-gnueabi/gobject-introspection-0.9.12-r0/gobject-introspection-0.9.12/gir'
        make[1]: *** [all-recursive] Error 1


Thanks,

Paul


[2] http://lists.linuxtogo.org/pipermail/openembedded-devel/2010-August/023029.html
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