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Date: Tue, 8 Nov 2011 19:00:40 +0100
From: Cyril Hrubis <metan DOT lists AT gmail DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] duplicate refdes values
Message-ID: <20111108180039.GA6472@yumi>
References: <20111108100616 DOT GA32119 AT yumi>
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Hi!
> > I've got bitten by this once more and decided for fix. The problem is
> > that I've, by a mistake, forgot to change refdes on one of my resistors
> > and spend another ten minutes by figuring out what went wrong.
> > 
> > What I want to fix is that both gsch2pcb and pcb are silent about this
> > and the pcb just picks up only one of them.
> > 
> > As far as I understand the gsch2pcb source it acts as a stream editor
> > and has no memory of previous parts I was thinking of adding hash table
> > of previous refdes values and make it print warning on duplicate
> > entires. I could prepare patch for this.
> > 
> > The pcb is more compliacted though both by the source code and by a gui
> > perspective. 
> 
> 1. This has nothing to do with pcb: this is gnetlist's normal behavior.
 
Well both of the tools keep silent about this which is in my opinion
wrong.

> 2. This is not a bug, it is a feature. Duplicate refdes values are the
> way you express the fact that you are treating a single single
> physical device as broken into several sections.

I'm saying this is a bug, I'm saying that this is worth a warning. What
about warning about duplicated refdes for syms that has no slotting
defined?

> 3. The drc2 back end to gnetlist already complains about duplicated
> refdes values for non-slotted components. Checking a design for errors
> is what drc2 is for, and if you're not using multiple heterogeneous
> symbols for parts, drc2 will do what you want here. The problem is
> that this isn't necessarily an error: this is one of the many cases
> where drc2's model of design is narrower than the capabilities of the
> toolkit. In this case, it is hard to fix drc2, as the indications of
> true error (inconsistent pin connections) are hidden behind the
> unnecessarily opaque gnetlist back-end API.

Sorry, I don't understand this one. Is drc2 any kind of tool? 

-- 
Cyril Hrubis