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Date:	Thu, 22 Oct 2015 12:50:09 -0400
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From:	DJ Delorie <dj AT delorie DOT com>
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Subject:	Re: [geda-user] A lesson from gnet-makefile
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> According to my oppinion ideally DRC should look on copper layer not
> which symbol it belong to. If it look on nets only I guess it could
> more or less temporary assign some net to all copper objects.

DRC works kinda funny.  First, it generates a connectivity list based
on the copper the way it is (and it looks at copper, not nets - this
includes all vias, pins, pads, polygons, lines, arcs, etc.).  This is
the "base" netlist (not the same as the "desired"/imported netlist).

Now, it "bloats" everything by pretending the sizes are increased by
some amount, and recomputes the netlist.  If the new netlist differs
from the base one, you have a minimum spacing issue.

Now, it "shrinks" everything, and repeats.  Changes indicate a line
width minimum issue.

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