[pango: 1/2] meson: Change introspection option to yielding feature

[Matthias Clasen <matthiasc src gnome org>]

commit 2a6bb53779c760dfabad9e8e8ae225dc12ac5631
Author: Xavier Claessens <xavier claessens collabora com>
Date:   Tue Sep 29 11:00:45 2020 -0400

    meson: Change introspection option to yielding feature
    
    Yielding option means that if pango is built as a subproject, it will
    take the value of that option from the parent project (e.g. gst-build).
    For that to work it must be of the same type, which is "feature" instead
    of "boolean" in all GStreamer modules.

 .gitlab-ci.yml    | 2 +-
 meson_options.txt | 5 +++--
 pango/meson.build | 3 ++-
 3 files changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dffa8056..c287010c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -40,7 +40,7 @@ asan-build:
   needs: []
   variables:
   script:
-    - CC=clang meson --buildtype=debugoptimized -Db_sanitize=address -Db_lundef=false -Dintrospection=false 
_build
+    - CC=clang meson --buildtype=debugoptimized -Db_sanitize=address -Db_lundef=false 
-Dintrospection=disabled _build
     - ninja -C _build
     - .gitlab-ci/run-tests.sh _build
   allow_failure: true
diff --git a/meson_options.txt b/meson_options.txt
index 5aa7c795..235b8a48 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -4,8 +4,9 @@ option('gtk_doc',
        value: false)
 option('introspection',
        description: 'Build the GObject introspection data for Pango',
-       type: 'boolean',
-       value: true)
+       type: 'feature',
+       value: 'auto',
+       yield: true)
 option('install-tests',
        description : 'Install tests',
        type: 'boolean',
diff --git a/pango/meson.build b/pango/meson.build
index 4c055f52..0b87b644 100644
--- a/pango/meson.build
+++ b/pango/meson.build
@@ -121,7 +121,8 @@ libpango = library(
 
 pango_dep_sources = [pango_enum_h]
 
-build_gir = get_option('introspection')
+gir = find_program('g-ir-scanner', required : get_option('introspection'))
+build_gir = gir.found() and (not meson.is_cross_build() or get_option('introspection').enabled())
 
 if build_gir
   gir_args = [