Re: gEDA-dev: SoC: Gerber, DRC, gsch2pcb and D-BUS

[Dan McMahill <dan-at-NOSPAMmcmahill_dot_net>]

DJ Delorie wrote:
>> On 21/03/07, Dan McMahill <dan@mcmahill.net> wrote:
>>> I'm in favor of a hash signature based on some canonicalized version of
>>> the footprint.  I guess you'd want to embed the hash when the footprint
>>> was first instantiated.
>> Which would be the canonicalized version? The footprint file itself?
> 
> Keep in mind that the footprints are modified through placement and
> rotation on the board, plus they can be modified to some extent (like
> renaming pins, or resizing solder masks).  So, it's not the element we
> have *now* that we need to hash, it's the element as it was when we
> loaded it.  The hash would need to ignore, for example, the name,
> refdes, description, order of pin statements, etc.  Simple
> rearrangement of the syntax of the file should not change the hash of
> the element.

Right.  Whitespace changes, equivalent specifications in the different 
formats, etc should all be ignored.

-dan



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