[fpc-devel] Re: Debugger for FPC

Jonas Maebe jonas.maebe at elis.ugent.be
Wed Mar 11 15:12:38 CET 2009

Graeme Geldenhuys wrote on wo, 11 mrt 2009:

> Continuing with the debugging issues on how do I debug something as
> simple as the global variable 'ShortDateFormat'? This just shows how
> broken debugging is in FPC. With Kylix or Delphi this is a no-brainer!
> See the URL below for a screenshot of the issue under Lazarus IDE.  By
> the way, I tried 'ddd' which is another GUI frontend for GDB and it
> gave the same problem. So once again, it's not a Lazarus issue, but a
> flawed GDB and Object Pascal support.

ShortDateFormat is declared as follows:

    ShortDateFormat: string absolute DefaultFormatSettings.ShortDateFormat;

FPC simply does not generate any debug information for absolute  
variables at this time.

It may even be quite challenging to generate debug information for  
something like that with Stabs. For DWARF, it seems there is some code  
that generates debug information in some cases, but only for "var a:  
type absolute b;"-style expressions (although I can't even trigger  
that at first sight).

With DWARF3, this should also be quite doable.


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