gud mode and changing files

gud mode and changing files

[Tom Tromey]

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In GNU Emacs 21.2.1 (i386-redhat-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-04-08 on porky.devel.redhat.com
configured using `configure  i386-redhat-linux --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/usr/com --mandir=/usr/share/man --infodir=/usr/share/info --with-gcc --with-pop --with-sound'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.iso885915
  locale-coding-system: iso-latin-9
  default-enable-multibyte-characters: nil

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:


I leave Emacs running for a long time, and I end up with many
buffers.  Sometimes I'll do a `cvs update' on the command line but not
refresh all the corresponding buffers I have in Emacs.

Then, when I'm debugging in gud mode, Emacs will show me the existing
buffer.  However, if the underlying file has changed then the gud
arrow ends up pointing to the wrong place.

This happened to me twice in the last few days.  Both times it took me
a while to realize what was going on, and that a simple C-x C-f would
fix it.

I think it would be useful if gud-mode would notice this situation and
tell me about it.  Perhaps before displaying a buffer it could ask me
if I want to refresh it from the filesystem.



Recent input:
C-a SPC c C-g < c SPC SPC C-u C-u C-n C-u C-p SPC SPC 
k d d SPC SPC = C-u C-l C-u C-n C-u C-n p SPC C-n SPC 
SPC n = C-n n SPC <backspace> = C-u C-n C-u C-n C-u 
C-n C-u C-n p SPC SPC c SPC l s C-u C-n C-u C-n z C-c 
b r <return> C-x 2 C-x o y <return> u p <return> <return> 
<return> C-x o C-x C-f <return> y e s <return> C-x 
o C-c C-l C-z o M-x r e p o r t - e <tab> <return>

Recent messages:
Updating of BBDB records finished [2 times]

Updating of BBDB records finished [3 times]

Wrote /home/tromey/.newsrc
Saving /home/tromey/.newsrc.eld...
Saving file /home/tromey/.newsrc.eld...
Wrote /home/tromey/.newsrc.eld
Saving /home/tromey/.newsrc.eld...done
Loading emacsbug...done

Tom

Re: gud mode and changing files

[Kevin Rodgers]

Tom Tromey wrote:

> I leave Emacs running for a long time, and I end up with many
> buffers.  Sometimes I'll do a `cvs update' on the command line but not
> refresh all the corresponding buffers I have in Emacs.
> 
> Then, when I'm debugging in gud mode, Emacs will show me the existing
> buffer.  However, if the underlying file has changed then the gud
> arrow ends up pointing to the wrong place.


Have you tried `M-x global-auto-revert-mode RET'?


> This happened to me twice in the last few days.  Both times it took me
> a while to realize what was going on, and that a simple C-x C-f would
> fix it.


Do you mean `C-x C-v'?


> I think it would be useful if gud-mode would notice this situation and
> tell me about it.  Perhaps before displaying a buffer it could ask me
> if I want to refresh it from the filesystem.

If global-auto-revert-mode is too intrusive, you could use auto-revert-mode in
the mode hook for the files you're debugging (presumably C mode).  You could
even make that conditional upon whether or not GUD is running.

-- 
<a href="mailto:&lt;kevin.rodgers&#64;ihs.com&gt;">Kevin Rodgers</a>