Re: A beginner's question

[Rudolf Schubert]

Hi John, Gaius,

thank you for the suggestions. I will try and see if I can track this down!

BR

Rudolf

--
Rudolf Schubert                 \
Kirchstr. 18a                    \  mailto:rudolf@muc.de
82054 Sauerlach                   > http://www.dose.muc.de
Deutschland                      /
Tel. 08104/908311               /


On Thu, 20 Apr 2023, john o goyo wrote:

> Greetings, Rudolf.
> 
> Further to the suggestion from Gaius (below), I find ddd+gdb to be very
> useful.  Depending on your system, ddd may be available in some repository.
> 
> Sincerely,
> john
> 
> 
> On 2023-04-20 11:18, Gaius Mulley wrote:
> > Hi Rudolf,
> > 
> > I use gdb to debug modula-2.  I also use gm2 with -g -O0 to generate
> > accurate line numbers etc.
> > Occasionally I find it useful to compile the whole project and get
> > good debugging inside the libraries via:
> > 
> > $ gm2 -g -O0 -fm2-whole-program -fiso mainmodule.mod
> > $ gdb a.out
> > 
> > (but perhaps it might be better to start without the
> > -fm2-whole-program and see if that is enough).
> > Exported procedure names are transformed into modulename_procedurename
> > whereas local procedures are without the module prefix.   When using
> > gdb it is also useful to use the ^x^a
> > (toggle) which splits the screen with source code in the top half.
> > 
> > I have some extra gdb enhancements - which I'm still working on (which
> > handle unbounded arrays).
> > I'll try and expedite these changes and post them to the gdb mailing
> > list - currently some regressions fail.
> > 
> > hope this helps,
> > Gaius
> > 
> > On Thu, Apr 20, 2023 at 10:53 AM Rudolf Schubert <rudolf@muc.de> wrote:
> > > Hi Gaius,
> > > 
> > > I quickly tested the patch and could verify that all my *mod files
> > > including squash_bug[123].mod now compile successfully as you write!
> > > Thank you very much for your (quick and successful) efforts!
> > > 
> > > One 'small' remaining problem now is: I do not have a real clue as
> > > how to track down the bugs which the three 'bug files' still exhibit
> > > when run. Till now I just entered some 'printfs' for debugging. Would
> > > you think that a 'real debugger' might help here? I.e. that I would try
> > > to see what's happening at register or assembler level? I'm not sure,
> > > however how quickly I would proceed here;-)
> > > 
> > > 
> > > BR
> > > 
> > > Rudolf
> > > 
> > > --
> > > Rudolf Schubert                 \
> > > Kirchstr. 18a                    \  mailto:rudolf@muc.de
> > > 82054 Sauerlach                   > http://www.dose.muc.de
> > > Deutschland                      /
> > > Tel. 08104/908311               /
> > > 
> > > 
> > > On Thu, 20 Apr 2023, Gaius Mulley wrote:
> > > 
> > > > Hi Rudolf,
> > > > 
> > > > many thanks for your email and test code - all very helpful.   Here is
> > > > a bug fix for the latest gcc git.
> > > > When applied I see squash_bug[123].mod all compile successfully.
> > > > 
> > > > The constructor was not being placed onto the preserve list within
> > > > cc1gm2.
> > > > 
> > > > regards,
> > > > Gaius
> > > > 
> 
>