[gtk-doc] mkdb: more tracing

[Stefan Kost <stefkost src gnome org>]

commit 591e42d5b72a747c28a940fbb2749c8209298ae5
Author: Stefan Sauer <ensonic users sf net>
Date:   Wed Dec 31 20:29:10 2014 +0100

    mkdb: more tracing
    
    Make it easier to spot the issue reported in #740956.

 gtkdoc-mkdb.in |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gtkdoc-mkdb.in b/gtkdoc-mkdb.in
index 62bea10..44b4477 100755
--- a/gtkdoc-mkdb.in
+++ b/gtkdoc-mkdb.in
@@ -5893,6 +5893,9 @@ sub ReadInterfaces {
              }
 
            $Interfaces{$object} = join(' ', @knownIfaces);
+           @TRACE@("Interfaces for $object: $Interfaces{$object}\n");
+       } else {
+         @TRACE@("skipping interfaces for unknown symbol: $object\n");
        }
     }
     close (INPUT);