[ghemical-devel] about problems with gcc-3.2

[Tommi Hassinen]

  This message is in MIME format.  The first part should be readable text,
  while the remaining parts are likely unreadable without MIME-aware tools.
  Send mail to mime@docserver.cac.washington.edu for more info.

---1045962744-646959846-1046940034=:66640
Content-Type: TEXT/PLAIN; charset=US-ASCII

On Wed, 5 Mar 2003, Michael Banck wrote:

> > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=9433
>
> According to that site, the bug got fixed in CVS at the end of January
> (please correct me if I'm wrong).

Ok, perhaps that's not the same bug, but an another one!  :)

But seriously speaking, I think I have more evidence that this is a
compiler issue. In attachments there is a patch file for the CVS head
(v1.50) version, that fixes the problem in GnomeViewCreator() function.
Now there is no need to do the cast (project *) -> (gnome_project *)
anymore since the gtk_object_get_user_data() function returns a pointer of
correct type already in the first place. The patch works fine when
compiled with gcc-2.95, just like the original CVS version.

When I try with gcc-3.2 then, the function GnomeViewCreator() goes fine
now, since no dynamic_cast<>() is attempted there, fine. But now it does
an exactly similar crash in an another function later, this time it's in
gnome_views.cpp (around line ~951) ProduceTreeListView(). And, perhaps
not surprisingly, the problematic code this time looks like:

treelist_view * gnome_class_factory::ProduceTreeListView(project * prj1)
{
cout << "ok, trying the next dynamic_cast<>(); here we go..." << endl;
	gnome_project * prj2 = dynamic_cast<gnome_project *>(prj1);
cout << "...but I don't think we can get this far! :(" << endl;

so, it's again the same operation, dynamic_cast from (project *) to
(gnome_project *).  :(  The second cout command is indeed not reached.

> The Debian unstable packages routinely contain CVS code, so I'll try a
> build with g++-3.2 (and g++-3.3, just found out that it's available,
> too) sometime later this week or at the weekend.

OK, thanks. Now it looks that I'm stuck with this problem, since those
pointer conversions simply should work IMO.

Regards,

	Tommi


---1045962744-646959846-1046940034=:66640
Content-Type: APPLICATION/octet-stream; name="ghemical-1.50-dynamic_cast.diff.gz"
Content-Transfer-Encoding: BASE64
Content-Description: 
Content-Disposition: attachment; filename="ghemical-1.50-dynamic_cast.diff.gz"
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---1045962744-646959846-1046940034=:66640--