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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: Any hope of being able to redefine C-x without problems???
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seberino@spawar.navy.mil (Christian Seberino) writes:

> Now I am trying to use gdb (debugger) within Emacs and it can't even
> start because gdb defines it's "prefix" to be C-x.
>
> I tried to redefine gud-key-prefix but I could not.  It seems C-x is
> extra touchy.  Any hope of pulling this off?

No.  Emacs reserves a number of key bindings for users, which modes
mustn't touch.  They are

* `C-c LETTER'   (C-c followed by any letter), and
* The function key F5-F9.

Use one of those reserved bindings to avoid conflict with major and
minor modes.