How can I specify emacs to use a specified gdb with command parameters

How can I specify emacs to use a specified gdb with command parameters

[Lucius Fox]

HI,

I want to setup gdb interface in emacs so that I can do source level
debugging within emacs.  My question is how can I specified gdb with
command parameters? Instead of using the one emacs found in the $PATH.

Thank you.

Re: How can I specify emacs to use a specified gdb with command parameters

[Peter Dyballa]

Am 20.03.2009 um 02:27 schrieb Lucius Fox:

> My question is how can I specified gdb with command parameters?


Do you mean you want to know what can be put into a .gdbinit file? Or  
are you looking for the

	M-x manual-entry RET gdb RET

command?

--
Greetings

   Pete

Make it simple, as simple as possible but no simpler.
				– Albert Einstein

Re: How can I specify emacs to use a specified gdb with command parameters

[David L]

On Thu, Mar 19, 2009 at 11:23 PM, Lucius Fox wrote:
> Thanks.
>
> Another question I have is
> * how does emacs knows where to pulll the source code during debugging?

I think it learns it from gdb.  gdb learns if from the debugging symbols in
the executable.  I think there is some interaction with some emacs settings
because I've had situations where I've been unable to insert a breakpoint
in a file by clicking in the left margin, but emacs has been able to bring
me to the right line when gdb stops at a breakpoint inserted the old
fashion way.

> * after i open a file, how can I setup a break point at a particular line?
If gdb is active and emacs and gdb agree that the file you've opened
is a source file (usually, but not always true in my experience), you can
just left click in the left margin.

I'm responding on-list to this because other people might be able
to give better answers.

Good luck,

           Dave


>
> On Thu, Mar 19, 2009 at 10:58 PM, David L wrote:
>> On Thu, Mar 19, 2009 at 10:47 PM, Lucius Fox  wrote:
>>> David,
>>>
>>> Thank you for your response.
>>> Is there a way to specify what my gdb command (like in your example,
>>> put '/tmp/mygdb --annotate=3 /tmp/myexec')  in .emacs file? So that it
>>> does not prompt me everytime I use M-x gdb?
>>
>> I do something like this in my .emacs:
>>
>> (defun my-gdb ()
>>  (interactive)
>>  (setq gdb-many-windows nil)
>>  (setq gdb-use-separate-io-buffer nil)
>>  (tool-bar-mode t)
>>  (set-fringe-mode 'default)
>>  (gdb "/tmp/mygdb --annotate=3"))
>>
>> Then I assign a key to run my-gdb
>>
>> (global-set-key [C-f7]  'my-gdb)
>>
>>
>> Cheers...
>>
>>              Dave
>>
>

Re: How can I specify emacs to use a specified gdb with command parameters

[Lucius Fox]

Right now, I need to do this at a shell in order to remote debug a c++ program.

$ cd /Volumne/workingdirectory
$ source ./build/envsetup.sh
$ gdb attach $pid

How can I repeat the same steps in emacs gdb?
After I type M-x gdb, i enter 'gdb attach $pid' , it just said 'gdb'
command not found .

My gdb location is setup by the script build/envsetup.sh.

Thank you for any help.


On Fri, Mar 20, 2009 at 6:38 AM, David L <idht4n@gmail.com> wrote:
> On Thu, Mar 19, 2009 at 11:23 PM, Lucius Fox wrote:
>> Thanks.
>>
>> Another question I have is
>> * how does emacs knows where to pulll the source code during debugging?
>
> I think it learns it from gdb.  gdb learns if from the debugging symbols in
> the executable.  I think there is some interaction with some emacs settings
> because I've had situations where I've been unable to insert a breakpoint
> in a file by clicking in the left margin, but emacs has been able to bring
> me to the right line when gdb stops at a breakpoint inserted the old
> fashion way.
>
>> * after i open a file, how can I setup a break point at a particular line?
> If gdb is active and emacs and gdb agree that the file you've opened
> is a source file (usually, but not always true in my experience), you can
> just left click in the left margin.
>
> I'm responding on-list to this because other people might be able
> to give better answers.
>
> Good luck,
>
>           Dave
>
>
>>
>> On Thu, Mar 19, 2009 at 10:58 PM, David L wrote:
>>> On Thu, Mar 19, 2009 at 10:47 PM, Lucius Fox  wrote:
>>>> David,
>>>>
>>>> Thank you for your response.
>>>> Is there a way to specify what my gdb command (like in your example,
>>>> put '/tmp/mygdb --annotate=3 /tmp/myexec')  in .emacs file? So that it
>>>> does not prompt me everytime I use M-x gdb?
>>>
>>> I do something like this in my .emacs:
>>>
>>> (defun my-gdb ()
>>>  (interactive)
>>>  (setq gdb-many-windows nil)
>>>  (setq gdb-use-separate-io-buffer nil)
>>>  (tool-bar-mode t)
>>>  (set-fringe-mode 'default)
>>>  (gdb "/tmp/mygdb --annotate=3"))
>>>
>>> Then I assign a key to run my-gdb
>>>
>>> (global-set-key [C-f7]  'my-gdb)
>>>
>>>
>>> Cheers...
>>>
>>>              Dave
>>>
>>
>

Re: How can I specify emacs to use a specified gdb with command parameters

[Nick Roberts]

 > >>>> Is there a way to specify what my gdb command (like in your example,
 > >>>> put '/tmp/mygdb --annotate=3 /tmp/myexec')  in .emacs file? So that it
 > >>>> does not prompt me everytime I use M-x gdb?

You can customize the variable 'gud-gdb-command-name'.  However /tmp generally
wouldn't be a good place to put your executable.  As its name implies, it's
for temporary files and, on many systems, all files in it get deleted every
time the system reboots.


 > >>> I do something like this in my .emacs:
 > >>>
 > >>> (defun my-gdb ()
 > >>>  (interactive)
 > >>>  (setq gdb-many-windows nil)

nil is default anyway.

 > >>>  (setq gdb-use-separate-io-buffer nil)

nil is default anyway.

 > >>>  (tool-bar-mode t)

(add-hook 'gdb-mode-hook
'(lambda ()
   (tool-bar-mode 1))

 > >>>  (set-fringe-mode 'default)
 > >>>  (gdb "/tmp/mygdb --annotate=3"))

This starts gdb without an executable.  You could add it to the string
argument but one day you might want to debug another program.

Using:

  (setq gud-gdb-command-name "/pathto/yourgdb --annotate=3") 

in your .emacs (or using customize to set it) means you will be prompted for
(or Emacs will suggest) an executable name.


> Right now, I need to do this at a shell in order to remote debug a c++ program.

> $ cd /Volumne/workingdirectory
> $ source ./build/envsetup.sh
> $ gdb attach $pid

> How can I repeat the same steps in emacs gdb?
> After I type M-x gdb, i enter 'gdb attach $pid' , it just said 'gdb'
> command not found .

> My gdb location is setup by the script build/envsetup.sh.

Who knows what your script does.  Gdb in Emacs (GUD buffer) works almost the
same as gdb from the command line.  If you do 'gdb attach $pid' from the
command line you get:

  Undefined command: "gdb".  Try "help"

just as you do in the GUD buffer.

Try typing just "attach $pid".  Here $pid must be a GDB convenience variable
and not a shell variable.

Why not read the Emacs and GDB info manuals which are readily available?


-- 
Nick                                           http://www.inet.net.nz/~nickrob