add introspection into GTK libs (part of #517)

This is all work of Marc Weber <marco-oweber@gmx.de>, except for a few nitpicks.

Tested space blowup: IMHO negligible to headers and similar stuff,
e.g. the firefox closure (reported by du) grows from 560 to 579 MB.
Saving space should be handled separately,
e.g. we have the multiple-outputs branch.

pkgs/development/libraries/gobject-introspection/default.nix

@@ -1,10 +1,18 @@
-{ stdenv, fetchurl, glib, flex, bison, pkgconfig, libffi, python, gdk_pixbuf
+{ stdenv, fetchurl, glib, flex, bison, pkgconfig, libffi, python
 , libintlOrEmpty, autoconf, automake, otool }:
+# now that gobjectIntrospection creates large .gir files (eg gtk3 case)
+# it may be worth thinking about using multiple derivation outputs
+# In that case its about 6MB which could be separated
 
 stdenv.mkDerivation rec {
-  name = "gobject-introspection-1.34.2";
+  name = "gobject-introspection-1.36.0";
 
-  buildInputs = [ flex bison glib pkgconfig python gdk_pixbuf ]
+  src = fetchurl {
+    url = "mirror://gnome/sources/gobject-introspection/1.36/${name}.tar.xz";
+    sha256 = "10v3idh489vra7pjn1g8f844nnl6719zgkgq3dv38xcf8afnvrz3";
+  };
+
+  buildInputs = [ flex bison glib pkgconfig python ]
     ++ libintlOrEmpty
     ++ stdenv.lib.optional stdenv.isDarwin otool;
   propagatedBuildInputs = [ libffi ];
@@ -13,13 +21,10 @@ stdenv.mkDerivation rec {
   # other dependencies).
   configureFlags = [ "--disable-tests" ];
 
-  src = fetchurl {
-    url = "mirror://gnome/sources/gobject-introspection/1.34/${name}.tar.xz";
-    sha256 = "0a9lq0y67sr3g37l1hy0biqn046jr9wnd05hvwi8j8g2bjilhydw";
-  };
-
   postInstall = "rm -rf $out/share/gtk-doc";
 
+  setupHook = ./setup-hook.sh;
+
   meta = with stdenv.lib; {
     description = "A middleware layer between C libraries and language bindings";
     homepage    = http://live.gnome.org/GObjectIntrospection;

pkgs/development/libraries/gobject-introspection/setup-hook.sh

@@ -0,0 +1,14 @@
+make_gobject_introspection_find_gir_files() {
+
+    # required for .typelib files, eg mypaint git version
+    if [ -d "$1/lib/girepository-1.0" ]; then
+      addToSearchPath GI_TYPELIB_PATH $1/lib/girepository-1.0
+    fi
+
+    # XDG_DATA_DIRS: required for .gir files?
+    if [ -d "$1/share" ]; then
+      addToSearchPath XDG_DATA_DIRS $1/share
+    fi
+}
+
+envHooks+=(make_gobject_introspection_find_gir_files)