[vala/0.48] vala: Report warning if --target-glib=auto was not evaluated successfully

[Rico Tzschichholz <ricotz src gnome org>]

commit 8f20d389e13033025a37c4feda6efb61120ab024
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Mar 3 17:01:41 2021 +0100

    vala: Report warning if --target-glib=auto was not evaluated successfully
    
    and don't try to process the valid "auto" string any further.

 vala/valacodecontext.vala | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/vala/valacodecontext.vala b/vala/valacodecontext.vala
index af9afed33..48f0964c5 100644
--- a/vala/valacodecontext.vala
+++ b/vala/valacodecontext.vala
@@ -604,8 +604,10 @@ public class Vala.CodeContext {
                        if (available_glib != null && available_glib.scanf ("%d.%d", out glib_major, out 
glib_minor) >= 2) {
                                glib_minor -= ++glib_minor % 2;
                                set_target_glib_version ("%d.%d".printf (glib_major, glib_minor));
-                               return;
+                       } else {
+                               Report.warning (null, "Could not determine the version of `glib-2.0', target 
version of glib was not set");
                        }
+                       return;
                }
 
                glib_major = target_glib_major;