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Date: Sun, 25 May 2014 01:30:49 +0200
From: Gabriel Paubert <paubert AT iram DOT es>
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Subject: Re: [geda-user] Re: Bug in PCB or in my design? Gerbers and layout
 do not agree
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On Fri, May 23, 2014 at 10:48:14PM -0400, Jason White wrote:
> Perhaps you could share more details on the design and footprint in
> question. I would try to isolate it down to a simple test case, a PCB
> layout with one or two elements that could be shared to demonstrate
> the issue.
> 
> On Fri, May 23, 2014 at 2:56 AM, onetmt <onetmt AT gmail DOT com> wrote:
> > Il 23/05/2014 00:28, Thomas Oldbury ha scritto:
> >> Anyone know what might cause this. Anything I might be missing. Thanks
> >>
> >>
> >> On 19 May 2014 00:41, Thomas Oldbury <toldbury AT gmail DOT com
> >> <mailto:toldbury AT gmail DOT com>> wrote:
> >>
> >>     See attached PCB file and gerbers. There is a direct shorting
> >>     polygon across a via and a pin of a power TSSOP U18 (near top center
> >>     of board). This isn't present on PCB layout nor does any net
> >>     shorting or DRC error show.
> >>
> >>     The short also appears in the photorender of the board.
> >>
> >>     Bug in PCB or something I'm doing wrong ?
> >>
> >>     This created some problems for a recent project I was doing since we
> >>     didn't see this short until we got the board made.  Luckily we were
> >>     able to work around it.
> >>
> >>     PCB version info:
> >>
> >>     "This is PCB, an interactive
> >>     printed circuit board editor
> >>     version 20110918
> >
> > This is the same release I have been using for (at least) the last 2
> > years - Debian tends to be quite conservative with new releases. I have
> > produced a dozen of new projects, but I didn't find anything of this
> > kind. From what you are (poorly) reporting it could seem a problem
> > somewhere in your netlist - maybe some problems with your footprints?

Look in the archives, I started a thrad with the title "polygon dicer bug"
on Jabuary 10th. The replies were, for some reason which escapes me, spread 
over other threads but the patch published by Robert Drehmel in the "new 
router pictures" on January 14th solved my polygon problems.

The patch is in:

http://www.delorie.com/archives/browse.cgi?p=geda-user/2014/01/14/15:20:10

The polygon code is still not perfect: a few weeks ago, I run into trouble
with PCB crashing, tracing with gdb showed that I ran into infinite recursion
(over 100000 deep). I managed to fix my board and I can't reproduce the
problem any more, but the result was a program crash, not a subtly wrong
file sent to manufacturing.

	Gabriel.