Re: Debug info in debian/ubuntu gnustep-examples

[Richard Frith-Macdonald]

On 21 Oct 2009, at 19:39, Fred Kiefer wrote:

> Eduardo Osorio Armenta schrieb:
> > Hello GNUstep community
> >
> > I'm new to this list; First of all great environment/framework/ 
> > tools, KUDOS
> > to all DEVs.
> >
> > I'm becoming a fan/user of WindowMaker/GNUstep in ubuntu 9.04
> >
> > I hope you get me a little help/direction/url trying to get the debug
> > symbols when compiling
> > the examples from gnustep-examples source in ubuntu package
> >
> > after downloading the source of this package i compiled fine with
> > make
> > and run with
> > openapp ApplicationName.app
> >
> > but trying to debug with gdb, it states that no debug info was know  
> > for
> > every program
> > so i research in gnustep wiki for a HowTo cook
> > and found that the command
> >
> > make messages=yes

That prints verbose output while bulding ... it doesn't build for  
debugging.
What you want is
'
make debug=yes

> > produces this info, but this didn't worked for gnustep-examples  
> > programs
> > only for a simple HelloWorld program (using Foundation NSLog, etc)
>
> As far as I know all GNUstep components get compiled with debug
> information enabled.

Yes, but unless you do 'make debug=yes' they are also compiled with  
optimisation ... which makes it difficult to interpret the output of  
gdb reliably as the optimiser will change the exact control flow in  
the program (so the line displayed in gdb can jump about  
unpredictably) and will remove many variables (so gdb can't examine  
them).

So for any code you intend to debug using gdb, you should build with  
'make debug=yes' which turns off optimisation.

> The simplest way to start debuging a GNUstep application is via
>
> debugapp ApplicationName.app
>
> or
> openapp --debug ApplicationName.app
>
> which is what I prefer.
>
> Hope this helps
> Fred
>
>
> _______________________________________________
> Discuss-gnustep mailing list
> Discuss-gnustep@gnu.org
> http://lists.gnu.org/mailman/listinfo/discuss-gnustep