--- gdb/completer.c.orig	2016-05-10 14:11:58.546188879 +0200
+++ gdb/completer.c	2016-05-10 14:12:22.899187374 +0200
@@ -1767,6 +1767,8 @@
   return displayer->width;
 }
 
+_rl_completion_prefix_display_length=0;
+rl_sort_completion_matches=1;
 extern int _rl_completion_prefix_display_length;
 extern int _rl_print_completions_horizontally;