GIR-based vala bindings

[Lorenzo Masini <lorenxo86 gmail com>]

Hi everyone.
I'm trying to change the method of generation of vapi files for Vala
bindings.

It should improve the Vala bindings generation, simplifing the
generation itself (no need of vala-gen-introspect, so bindings can be
generated during build) and more accurate bindings (if the GIRs are
correctly generated the .metadata files become useless).

I'm using the switch-to-gir branch of vala, which should be merged in
master soon.

For now I've only fixed the generation of GIR files (see
https://bugzilla.gnome.org/show_bug.cgi?id=635330 for informations) in
my personal clone
(http://gitorious.org/~rugginoso/libchamplain/rugginoso-clone/commits/vala-switch-to-gir).
Probably, it will need some other enhancements.

Now I'm stuck on some autoconf/automake issues (because my leak of
knowledge about them).
In particular, I need that at the moment of GIR files generation,
the .pc files in the $top_builddir are the ones that will be installed
(champlain-0.10.pc).
Another problem is that I can't set the PKG_BUILD_PATH to $top_builddir
in champlain-gtk/Makefile.am to make g-ir-scanner find the not yet
installed .pc files.

Can someone help me?

Cheers
Lorenzo