[PD] binary compatibility

[Charles Z Henry]

On Mon, Jul 27, 2015 at 12:08 PM, Jonathan Wilkes via Pd-list
<pd-list at lists.iem.at> wrote:

> Background info: Pd-l2ork has an extra member at the _end_ of the
> t_widgetbehavior struct.  This member is used to do accelerated displacing
> of a selection of objects in Pd.

This type of modification isn't meant to be binary compatible in both
directions.  Your Pd-Vanilla externals with the Vanilla
t_widgetbehavior struct will not work in Pd-l2ork, because the struct
is smaller.

When Pd-l2ork tries to access those elements off the end of the
t_widgetbehavior struct, it should seg fault.