[gtk+] build: Add option to enable/disable GIR generation

[Emmanuele Bassi <ebassi src gnome org>]

commit 3a0eab776e9fcff2d985c1677920cd275faae133
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sat Sep 2 12:00:05 2017 +0100

    build: Add option to enable/disable GIR generation
    
    And drop the unnecessary is_cross_build() check: it's entirely possible
    to generate introspection data when cross-compiling.

 gtk/meson.build   |    3 ++-
 meson_options.txt |    2 ++
 2 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gtk/meson.build b/gtk/meson.build
index 5fed5b7..931d6c4 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -916,7 +916,8 @@ libgtk_dep = declare_dependency(sources: [gtkversion, gtktypebuiltins_h],
                                 link_args: common_ldflags)
 
 # Introspection
-if not meson.is_cross_build()
+build_gir = get_option('enable-gir')
+if build_gir
   gir_args = [
     '--quiet',
   ]
diff --git a/meson_options.txt b/meson_options.txt
index 518cecf..bcd4967 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -32,3 +32,5 @@ option('enable-documentation', type: 'boolean', value: 'false',
   description : 'Build API reference and tools documentation')
 option('enable-man-pages', type: 'boolean', value: 'false',
   description : 'Build man pages for installed tools')
+option('enable-gir', type: 'boolean', value: 'true',
+  description : 'Build introspection data (requires gobject-introspection)')