[fpc-pascal]Interface-only units (was: shared libraries interface)

[Marco van de Voort]

> > BTW, now I've got an impression that VP's approach is only
> > good for hiding sources. Well, it wasn't designed for anything
> > else.
> 
> But you don't need interface-only units for that ?
> Simply don't distribute the sources.
> Strip the interface part and distribute it together with the .ppu.
> You must do that anyhow for almost each compiler version.
> (hopefully I demonstrated that convincingly enough) , so...

The vendor of that unit must then recompile for each release, and if e.g.
a customer has to use some snapshot (e.g. for a bug), he has to recompile
it with that also.