Invokes gdb, which attaches to the current process and shows a stack trace.
Called by g_on_error_query() when the Stack trace option is selected.
This function may cause different actions on non-UNIX platforms.
the program name, needed by gdb for the Stack trace option.
If prg_name is NULL, g_get_prgname() is called to get the program name
(which will work correctly if gdk_init() or gtk_init() has been called).
Invokes gdb, which attaches to the current process and shows a stack trace. Called by g_on_error_query() when the Stack trace option is selected. This function may cause different actions on non-UNIX platforms.