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Date:	Sat, 2 Jan 2016 13:43:12 -0500
Message-Id:	<201601021843.u02IhC5U021940@envy.delorie.com>
From:	DJ Delorie <dj AT delorie DOT com>
To:	geda-user AT delorie DOT com
In-reply-to:	<568817CC.7090207@ecosensory.com> (message from John Griessen on
	Sat, 2 Jan 2016 12:32:44 -0600)
Subject:	Re: [geda-user] ideas on slotting and mechanisms for
	grouping/associating heterogenous symbols.
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> > Should this be something you can do in the layout program?
> >
> > If so, how do you specify "that gate" in the schematic when you want
> > to make an as-built?
> 
> Yes.  As in my proposed idea that I will now call "pinswap by attribs and pinswap file"     :

Your example isn't the example I was thinking of.  Consider this schematic:

http://www.delorie.com/pcb/symsym.png

In layout, you swap one of those gates with a gate in U2 (elsewhere).

How do you know which gate you swapped?

There's nothing in the schematic to make those two gates unique, other
than where they fit in the geometry of the page.

I think pin swapping in a huge FPGA is trivial compared to solving
this simple problem.

Even solving that problem when you *don't* allow swapping between
packages, is hard.

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