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Date: Sun, 13 Jun 2021 19:19:27 +0200 (CEST)
From: Roland Lutz <rlutz AT hedmen DOT org>
To: "Claudio Fabri (clafi AT gmx DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] PCB can no longer imports schematic
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On Sun, 13 Jun 2021, Claudio Fabri (clafi AT gmx DOT com) [via 
geda-user AT delorie DOT com] wrote:
> OMG! You're my saviour (at least so far ;-)
>
> I indeed have an accented character in the current directory name. I ran 
> gnetlist --list-backends from another directory and I now get a list of 
> backends.

Hmm.  I tried that, but that works fine on my machine.

Do you use a non-UTF8 locale?

> ERROR: Could not find backend `pcbfwd' in load path.
>
> […]
>
> ~# gnetlist --list-backends | grep -i pcb
>  [PG]  PCB
>  [PG]  gsch2pcb
>  [PG]  liquidpcb
>  [P ]  pcbfwd
>  [PG]  pcbpins
>
> This works: gnetlist -g PCB -o oscillator.net oscillator.sch
> This doesn't: gnetlist -g pcbfwd -o oscillator.net oscillator.sch
>
> I've also inspected the list of files for package pcb (I have version 
> 4.2.2) and there's also a file named gnet-pcbfwd.scm in 
> /usr/share/gEDA/scheme/.

Ah, yes.  There are two variants for most backends: the legacy Guile one 
(used with the -g option) and the newer Python one (used with -p). 
Traditionally, the pcbfwd backend was supplied by PCB, so either PCB needs 
to be installed to the same prefix as gEDA/gaf (so gnetlist finds the 
gnet-pcbfwd.scm file), or the backend paths need to be adjusted correctly. 
gEDA/gaf comes with its own Python version of the pcbfwd backend, so using 
`-p pcbfwd' would work, but AFAIK, PCB doesn't allow changing the import 
command.

You can add the directory to which gnet-pcbfwd.scm was installed by PCB to 
the backend load path by adding the following line to your "gafrc" or 
"gnetlistrc" file:

   (scheme-directory "PCBPREFIX/share/gEDA/scheme/")

where PCBPREFIX needs to replaced with the directory PCB was installed to 
(like "/usr/local").  Now, "gnetlist --list-backends" should yield

   [PG]  pcbfwd

with a G indicating that the Guile version of the backend was found.

Roland

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