vala: Trigger understandable errors with GLib target version

diff --git a/vala/valacodecontext.vala b/vala/valacodecontext.vala
index 815899ceef06115a5aa806ab8acfd552e8f83eb7..34543a8d9e73018aeb054aa16aaab40085639590 100644 (file)
--- a/vala/valacodecontext.vala
+++ b/vala/valacodecontext.vala
@@ -557,7 +557,7 @@ public class Vala.CodeContext {
 
                if (target_glib != null && target_glib.scanf ("%d.%d", out glib_major, out glib_minor) != 2
                    || glib_minor % 2 != 0) {
-                       Report.error (null, "Invalid format or version for target GLib");
+                       Report.error (null, "Only a stable version of GLib can be targeted, use MAJOR.MINOR format with MINOR as an even number");
                }
 
                if (glib_major != 2) {