meson: introspection optional

Calling g-ir-scanner when cross-compiling with bitbake/OpenEmbedded
fails because it calls the wrong ld (the one from the host). More work
will be needed in meson.bbclass and/or gobject-introspection.bbclass
to make it work.

In the meantime, having an option to turn of introspection is useful
perhaps also in other cases where the extra work is not needed. For
example, fwupd works fine also when it is off.

The name of the new meson option matches the --disable-introspection
that is used by some autotools-based projects.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>

3 files changed, 39 insertions, 34 deletions

diff --git a/libappstream-builder/meson.build b/libappstream-builder/meson.build
index ce257a4..55f0868 100644
--- a/libappstream-builder/meson.build
+++ b/libappstream-builder/meson.build
@@ -128,21 +128,23 @@ asbuilder_introspection_srcs = [
   'asb-task.h',
 ]
 
-asglib_gir_dep = declare_dependency(sources: asglib_gir)
-
-gnome.generate_gir(asbuilder,
-  sources : asbuilder_introspection_srcs,
-  nsversion : '1.0',
-  namespace : 'AppStreamBuilder',
-  symbol_prefix : 'asb_',
-  identifier_prefix : 'Asb',
-  export_packages : 'appstream-builder',
-  dependencies: asglib_gir_dep,
-  includes : [
-    'AppStreamGlib-1.0',
-    'GdkPixbuf-2.0',
-    'Gio-2.0',
-    'GObject-2.0',
-  ],
-  install : true
-)
+if get_option('enable-introspection')
+  asglib_gir_dep = declare_dependency(sources: asglib_gir)
+
+  gnome.generate_gir(asbuilder,
+    sources : asbuilder_introspection_srcs,
+    nsversion : '1.0',
+    namespace : 'AppStreamBuilder',
+    symbol_prefix : 'asb_',
+    identifier_prefix : 'Asb',
+    export_packages : 'appstream-builder',
+    dependencies: asglib_gir_dep,
+    includes : [
+      'AppStreamGlib-1.0',
+      'GdkPixbuf-2.0',
+      'Gio-2.0',
+      'GObject-2.0',
+    ],
+    install : true
+  )
+endif
diff --git a/libappstream-glib/meson.build b/libappstream-glib/meson.build
index 1753431..3607dfe 100644
--- a/libappstream-glib/meson.build
+++ b/libappstream-glib/meson.build
@@ -212,19 +212,21 @@ introspection_sources = [
   'as-utils.h',
 ]
 
-asglib_gir = gnome.generate_gir(asglib,
-  sources : introspection_sources,
-  nsversion : '1.0',
-  namespace : 'AppStreamGlib',
-  symbol_prefix : 'as_',
-  identifier_prefix : 'As',
-  export_packages : 'appstream-glib',
-  dependencies : deps,
-  includes : [
-    'GObject-2.0',
-    'Gio-2.0',
-    'GdkPixbuf-2.0'
-  ],
-  link_with : asglib,
-  install : true,
-)
+if get_option('enable-introspection')
+  asglib_gir = gnome.generate_gir(asglib,
+    sources : introspection_sources,
+    nsversion : '1.0',
+    namespace : 'AppStreamGlib',
+    symbol_prefix : 'as_',
+    identifier_prefix : 'As',
+    export_packages : 'appstream-glib',
+    dependencies : deps,
+    includes : [
+      'GObject-2.0',
+      'Gio-2.0',
+      'GdkPixbuf-2.0'
+    ],
+    link_with : asglib,
+    install : true,
+  )
+endif
diff --git a/meson_options.txt b/meson_options.txt
index e8c7f55..b2d971a 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -6,3 +6,4 @@ option('enable-fonts', type : 'boolean', value : true, description : 'enable fon
 option('enable-stemmer', type : 'boolean', value : true, description : 'enable stemmer support')
 option('enable-man', type : 'boolean', value : true, description : 'generate man pages')
 option('enable-gtk-doc', type : 'boolean', value : false, description : 'generate API reference')
+option('enable-introspection', type : 'boolean', value : true, description : 'generate GObject Introspection data')