GNOME dumps no core

[redhog mini dhs org]

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I recently installed the newest version of the GNOME libs. While I am
modfying GTK, sometimes thing crashes. And I want to know why. But nowdays
GNOME programs just shows a nice dialog with a link to the
crash-info-homepage. And does not dump a core file! How do I debug such a
stupid program?! Dop anyone know how i force it to generate a core-file
on crash? I have read all the ./configure-options for the GNOME-libs...
And they says absolutely nothing about it...

By the way, I modified GtkWidget, in a way that enlarged the
_GtkWidget-struct. This caused gnome programs to crash with an error about
something somewhere in GtkBin... I tracked it down to the enlargement of
GtkWidget (Insert a GtkWidget *foo in _GtkWidget, at the end). Is the size
of that GtkObject hardcoded somewhere?
Wbr,
Egil

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