Use ctl-x-map to bind C-x SPC.

diff --git a/lisp/gud.el b/lisp/gud.el
index 421bb15b33784d868ebe8b977aa78c3635032db2..4655dd37eac49a2e89855c52fbd150f32b466f47 100644 (file)
--- a/lisp/gud.el
+++ b/lisp/gud.el
@@ -47,7 +47,7 @@
   "Prefix of all GUD commands valid in C buffers.")
 
 (global-set-key (concat gud-key-prefix "\C-l") 'gud-refresh)
-(global-set-key "\C-x " 'gud-break)    ;; backward compatibility hack
+(define-key ctl-x-map " " 'gud-break)  ;; backward compatibility hack
 
 ;; ======================================================================
 ;; the overloading mechanism