[gnome-builder] vala: get the libvala version dynamically

[Christian Hergert <chergert src gnome org>]

commit e076192953577a910f0cdcbfaeffb09c45e79ad6
Author: Corentin Noël <corentin noel collabora co uk>
Date:   Sat Feb 17 19:03:18 2018 +0000

    vala: get the libvala version dynamically

 src/plugins/vala-pack/meson.build | 26 +++-----------------------
 1 file changed, 3 insertions(+), 23 deletions(-)
---
diff --git a/src/plugins/vala-pack/meson.build b/src/plugins/vala-pack/meson.build
index 0bde39788..516d017ce 100644
--- a/src/plugins/vala-pack/meson.build
+++ b/src/plugins/vala-pack/meson.build
@@ -6,29 +6,9 @@ endif
 
 add_languages('vala')
 
-libvala_options = [
-  ['libvala-0.40', ''],
-  ['libvala-0.38', ''],
-  ['libvala-0.36', ''],
-  ['libvala-0.34', ''],
-]
-
-libvala_found = false
-foreach v: libvala_options
-  if not libvala_found or not libvala.found()
-    if v[1] != ''
-      libvala = dependency(v[0], version: v[1], required: false)
-    else
-      libvala = dependency(v[0], required: false)
-    endif
-    libvala_found = libvala.found()
-    libvala_version = v[0].split('-')[1]
-  endif
-endforeach
-
-if not libvala_found
-  error('Failed to find suitable libvala')
-endif
+valac = find_program ('valac')
+libvala_version = run_command(valac, '--api-version').stdout().strip()
+libvala = dependency('libvala-@0@'.format(libvala_version))
 
 vala_pack_sources = [
   'config.vapi',