Date: Fri, 10 Jan 2014 15:49:14 +0400
From: Vladimir Zhbanov <vzhbanov AT gmail DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Suppress NC nodes from netlist?
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On Thu, Jan 09, 2014 at 04:38:35PM -0800, Frank Miles wrote:
> (gschem-gnetlist newbie here...)
> 
> I'd like to suppress 'not connected' nodes from the gnetlist output.  These have
> NC symbols attached in gschem.  Is there some simple way that I'm oblivious to?
> Or is this possible in a newer gnetlist and not mine?  Thanks!
> 
> 	-Frank
> 
> (running the old gnetlist that's in Debian/testing: Debian's version 1.6.2-4.3 .)

Internally, gnetlist evaluates each and every connection.

I created a small test schematic with some component pins
connected to nc-left.sym and did:

for i in $(gnetlist --list-backends|grep -v "backends\|^$"); do
  gnetlist -g $i -o $i.net 1.sch 
done

For each pin connected in such a way, all backends that worked
without errors output single pin nets. Of course, some refdes
based netlists (e.g. spice-sdb) don't care.

I use the recent version compiled from git, and AFAIK, there is no
gnetlist option to ignore connections to no-connect symbols.

As Gabriel said, this is probably a bug, so you can file a bug
report.

And if you just want to not see nets for some unnecessary pins in
your netlist, just don't connect them anywhere.