Re: compiling gtkmm with atkmm support fails in implementor.cc

[codekiddy <codekiddy gmail com>]

Hey guys, first thank you Kjell and and big thanks you John for taking the time to rebuild gtkmm to confirm the issue!!

I posted this problem 9 months ago here on gtkmm-list (first time compiling with msvc then) but didn't get any reply, finally it looks there indeed is a bug or something...

I thought it was my fail with compilation or something...

I'm looking forward for replies, I'm not comfortable in debugging glib, atkmm and such since I don't know the code well, but, maybe we should open a bug-ticket on gnome or github?

Thanks!

On Tue, Nov 17, 2015 at 12:31 PM, John Emmas <john creativepost co uk> wrote:

On 17/11/2015 09:07, Kjell Ahlstedt wrote:

You mentioned in an earlier post that the error you see is a double deletion of some memory. [...] Therefore I ran the toolbar example program in the gtkmm tutorial (which allocates some widgets on the heap) with valgrind. It reported some lost (leaked) memory. That's normal with programs that use glib and gtk+. No other memory problems. And I checked with gdb that Atk::Implementor::~Implementor() was called several times.

Hi Kjell - presumably you built with gcc, yes..?

I'm actually building with MSVC-8 but for the hell of it, I re-built Gtkmm this morning - this time making sure that GTKMM_ATKMM_ENABLED was definitely #defined.  Believe it or not I see the same crash as codekiddy!  I used a very simple application:-

    int main (int argc, char *argv[])
    {
        Gtk::Main       app (&argc, &argv); // Calls 'gtk_init()'
        Gtk::Window  mainWnd;

        mainWnd.set_title ("Whatever");

        app.run (mainWnd);

        return 0;
    }

When I attempt to close the app's window it crashes in the d'tor for Glib::Atk::Implementor.  More specifically, it crashes at this code in 'glibmm/glib/glibmm/refptr.h':-

    template <class T_CppObject> inline
    RefPtr<T_CppObject>::~RefPtr()
    {
      if(pCppObject_)
        pCppObject_->unreference(); // This could cause pCppObject to be deleted.
        //  ^ ^ ^  CRASH HAPPENS HERE
    }

and the above seems to get called during this 'destroy_()' call in 'gtkmm/gtk/gtkmm/window.cc':-

    Window::~Window()
    {
      destroy_();
    }

My guess would be that there is indeed some kind of double deletion happening.  I'll spend another hour or so on it and see if I can get any further...

John

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