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Date: Tue, 31 Jan 2012 17:31:18 -0800
From: Colin D Bennett <colin AT gibibit DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Multiple footprint attributes in gschem symbols?
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On Wed, 01 Feb 2012 01:46:53 +0100
Stefan Salewski <mail AT ssalewski DOT de> wrote:

> There exist devices like special DC/DC-converters,
> micro-controllers and other special parts, which are available in
> two or three footprints, like DIP8 and SO8. (With identical
> function and pin numbering!)
> 
> How do we specify these two footprints in symbols?
> 
> I am asking because I intend to display the variants in an
> editable GtkComboBox in the attribute editor.
> 
> footprint_1=DIP8
> footprint_2=SO8
>
> or
> 
> footprint=DIP8, SO8

footprint=X, Y isn't good because it overloads the footprint
attribute.  I say the most general and cleanest way is to use
“footprints=X, Y, Z” (note plural) and then choose the specific
footprint for an instance of the symbol by settings
“footprint=Y” (note singular).

> may be fine for the symbol file, so we can use
> 
> footprint=DIP8
> 
> in the schematic file for users selection?

I think someone (Kai-Martin?) made a patch or at least a design
mockup suggesting how it would be implemented where a heavyweight
symbol could provide a 'footprints=FOOTPRINT1, FOOTPRINT2,
FOOTPRINT3' attribute that can give the user choices.

Regards,
Colin