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bug#6035: M-x gdb crashes

From: Arni Magnusson
Subject: bug#6035: M-x gdb crashes
Date: Tue, 6 Jul 2010 08:47:20 +0000 (GMT)
User-agent: Alpine 2.00 (LFD 1167 2008-08-23)

C-c C-char: reserved for major and minor modes (source: elisp manual)

C-x C-char: free game for anyone, potential tug-of-wars between users and modes, but no should pose no danger of crashing a mode (source: my interpretation and experience)

Given the nature of Emacs, some tug-of-war of keybindings can be expected. Many of my mode hooks, for example, rebind M-n and M-p to what I like them to do, overriding what the mode author thought I might like. This is harmless, and has not crashed any mode. The elisp manual (23.2.2) allows major modes to use these and other keystrokes, but I'm sure many Emacs users have bound them to generic functions they find useful in all modes.

We sound like lawyers here, but all I'm asking is whether it's easy to prevent M-x gdb from crashing if C-x C-a is bound. If it's not easy, then so be it; the current error message accurately describes the quirk.



On Tue, 6 Jul 2010, Lennart Borgman wrote:

On Tue, Jul 6, 2010 at 2:27 AM, Arni Magnusson <address@hidden> wrote:

I can find no warning
against redefining C-x C-char, such as C-x C-a.

The elisp manual chapter mentioned before here

  (info "(elisp) Key Binding Conventions")

says that

  * Sequences consisting of `C-c' followed by a control character or a
    digit are reserved for major modes.

So it looks to me like GUD does follow that rule.

Maybe the error message could include a link to that part of the elisp
manual, but that would rather be a general thing in Emacs, not
specific to GUD.

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