[glibmm] CI: Skip building with Autotools if glib is too old

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 818d7a22708ddc225b6363cd845e6cd72481028d
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Sat Aug 27 10:10:58 2022 +0200

    CI: Skip building with Autotools if glib is too old

 .gitlab-ci.yml | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 139a3e0a..ac51f290 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -80,11 +80,19 @@ autotools_build:
   variables:
     DEPENDENCIES: $MESON_DEPS make autoconf
   script:
+    # Don't try to build with Autotools if the image's version of glib is too old.
+    # Meson can build glib as a subproject, but Autotools has no subprojects.
+    - glib_required=`sed -n '/glibreq=/ s/.*\(2\.[0-9]*\.[0-9]*\).*/\1/p' configure.ac`
+    - glib_exists=`pkg-config --modversion glib-2.0`
+    - if test $glib_required '>' $glib_exists; then
+    - echo GLib $glib_exists exists, $glib_required required. Skip building with Autotools.
+    - else
     - cp -r installdir/usr /
     - ./autogen.sh --enable-warnings=fatal --prefix=/usr
     - make
     - make check
     - make install
+    - fi
   allow_failure: true
 
 debug_gcc_build: