Re: Stack walkbacks and catching unhandled exceptions

[Richard Frith-Macdonald]

On 22 Jun 2008, at 22:07, Vincent Coetzee wrote:

> 1-2. When I use Objective-C on Mac OS X, the first thing I do when I  
> start developing an Application is to install an UnhandledException  
> handler that gives me a full stack trace when it catches an  
> unhandled exception. I would very much like to do this on Ubuntu  
> using Foundation (GnuStepBase) since everytime NSObject catches a  
> doesNotUnderstandSelector my App aborts and I have to bugger around  
> for 10 minutes with the debugger to find out the selector, class and  
> method. I have tried installing an unhandled exception handler using  
> the ( mostly ) undocumented functions to no avail. All the functions  
> I install never get invoked. Does anyone know how to do this with  
> certainty.

Certainly ... to the best of my knowledge this is exactly the same  
mechanism in gustep-base as in the Apple Foundation.
See 
http://www.gnustep.org/resources/documentation/Developer/Base/Reference/index.html
This feature has always been present in base.

> And secondly I can not find the companion methods in GnuStepBase  
> that I use in Mac OS X Foundation to get a stack trace. Can some  
> assist / suggest ?

Again, to the best of my knowledge the API for stack trace management  
in base has everything in MacOS-X.  However, in base things are  
actually a lot easier as you can also use the GNUSTEP_STACK_TRACE  
environment variable: 'When this is set to YES a stack trace is added  
to the output of the description method of a raised exception object.'
Stacktrace reporting was added to base about a year before Apple added  
stacktrace methods to Foundation, and then adjusted to match Apple's  
changes in recent releases.