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Re: Emacs and Gud

From: Chris Gordon-Smith
Subject: Re: Emacs and Gud
Date: Tue, 08 Jan 2008 23:27:54 +0000
User-agent: KNode/0.10.4

Nick Roberts wrote:

>  > If I run GUD with --annotate=1 then I gat the basic two buffer
>  > debugging, and this works OK within an ECB environment.
>  > 
>  > With --annotate=2  or --annotate=3, GUD doesn't work properly with ECB.
>  > I get messages like:-
>  > 
>  > "error in process filter; Window height 2 too small (after splitting)"
> Both ECB and gdb-ui (the graphical part of GUD) use something called
> dedicated windows.  This means that they're protective over their
> window configuration and won't let other buffers display in their windows.
>  > Sometimes it partly works, but usually the GUD menu disappears and so
>  > do most of the debug windows. There seems to be no way to get them
>  > back.
> Maybe 'C-x 5 2' (opens a new frame) followed by M-x gdb-many-windows in
> the new frame will work
>  > If I deactivate ECB before I start GDB, then both --annotate=2 and
>  > annotate=3 work fine.
>  > 
>  > Incidentally, I have set gud-gdb-command-name to
>  > gdb --annotate=3
>  > /home/chris/mydata/Projects/SimSoup/simsoup-cpp/simsoup/simsoup
>  > 
>  > I mainly use ECB for programming, and I think that while it would be
>  > nice to have it available while debugging, it is workable without.
>  > 
>  > Any thoughts on how to get ECB and GUD working together would however
>  > be welcome.
> I think there will always be conflicts without a major redesign.  ECB
> isn't
> part of Emacs and I've never really used it.  Ideally ECB would be
> integrated into Emacs but that would be a lot of work and I don't think
> it's going to happed anytime soon.
> If simsoup is a large program and you really need a project based
> development
> environment you may be better off using Eclipse with CDT.  I guess I
> shouldn't really be saying that on help-gnu-emacs and you will have to
> recommend the use of GDB in Emacs to others as a daily pennance!

Thanks for your comments. Regarding IDEs such as Eclipse, I have been using
KDevelop for several years. I have found it very good, but want to try
Emacs. Reasons for this include:-

*   I want to take control of the Build / Make process. IDEs like KDevelop
and Eclipse tend to do this for you. That is very useful, but I now need to
control it myself. (I am using Makefiles to enforce separation of
subsystems by using CFLAGS to determine which include files a subsystem has
access to.)

*   More generally I want to get closer to the Linux programming
environment. Again, an IDE tends to shield one from this

*   I want to understand why Emacs has such a legendary reputation!

So far I have been pleasantly surprised by Emacs. One thing I like is the
ability to switch easily between buffers. KDevelop opens up all of the
files for a project, which makes switching more difficult since so many
files are open. In practice you have to go via the code browser each time. 

I see a code browser as essential, and would not consider using Emacs
without something like ECB. Now that I also have GDB working (although with
the minor drawback that if I want its full functionality I have to
deactivate ECB), I have a good development environment based on Emacs.

Its taking a while to get used to the editing style, but there are a number
of aspects I like. I seem to be able to get more on a screen, and I like
the fact that everything is configurable. For example, I have configured
Emacs to disregard mouse wheel clicks within 0.5 seconds of scrolling. This
means that I don't accidentally paste (yank) text into a file while
scrolling. This is very annoying in KDevelop.

Perhaps I will go back to KDevelop one day, or perhaps not. For the moment I
am enjoying using Emacs and getting to know the powerful features that it

I have also tried Eclipse / CDE. It looks good, but as mentioned above, I
want to get away (at least for a while) from an environment that tends to
shield one from the underlying operating system and programming
environment. I want to get 'close to the bare metal'.

One other thing about Emacs; by comparison with KDevelop and Eclipse its
more responsive.

One thing with Emacs I want to look at is syntax highlighting. Its working,
but I haven't yet figured out how to control all of the options.

Chris Gordon-Smith

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