2013-11-22 14:57, John Emmas skrev:
Gtk::SpinButton some_spin_button;
Gtk::Adjustment some_adjuster (2, 0, 100, 1, 10, 0);
some_spin_button.set_adjustment (some_adjuster);
If I include the above lines in any gtkmm app (and build with MSVC)
the app eventually crashes at the stage where 'some_spin_button' is
getting destroyed (this is with gtkmm 2.24.4). If the app is run from
a command line, Windows outputs a message saying "pure virtual
function call" and then terminates it. A couple of things might be
significant:-
1) If I comment out the 3rd line the crash doesn't happen.
2) The crash has a very similar feel to the problem I reported
very recently with derived windows and dialogs (i.e. the signs are
very much like a C++ wrapper got disconnected from its C object too
early).
3) The crash happens in 'gtk_spin_button_finalize()' while
executing this line:-
gtk_spin_button_set_adjustment (GTK_SPIN_BUTTON
(object), NULL);
I could provide a more comprehensive example if needed but I thought
I'd check first in case this is already a known issue. AFAICT just
adding those three lines to any gtkmm app is enough to trigger the
problem.
John
I copied your MyDialog example, and added the above three lines to
MyDialog's constructor. When I ran it with gtkmm 2.24.4 (no patches
added) it does *not* crash. Valgrind does not report any accesses to
freed memory, but that's perhaps not very informative in this case. I
don't think valgrind checks accesses to memory on the stack.
Did you test with or without the patches from bug 605728? Does the order
of definition of some_spin_button and some_adjuster matter? When
some_spin_button is defined before some_adjuster, some_adjuster will be
deleted before some_spin_button (at least the C++ part of it, probably
not the underlying GtkAdjustment).
What's going on in your system? I get a feeling that the patches you've
applied to your copy of gtkmm 2.24.4 only hide the symptoms of a
different bug than the one those patches fixed in gtkmm 3.
Kjell
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