onErrorStackTrace
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. You can get the current process's program name with g_get_prgname(), assuming that you have called gtk_init() or gdk_init().
This function may cause different actions on non-UNIX platforms.
When running on Windows, this function is not called by g_on_error_query(). If called directly, it will raise an exception, which will crash the program. If the G_DEBUGGER
environment variable is set, a debugger will be invoked to attach and handle that exception (see glib-running.html).
Parameters
prgName
the program name, needed by gdb for the "Stack trace" option