On 15.12.2016 20:02, Chris Pavlina wrote:
> The addition of (diff_pair_gap) and (diff_pair_width) has made it such
> that NO PCBs made with 'master' builds can now be loaded in the 4.0
> branch. Would a patch be accepted to do one of the following, to be
> added to the 4.0 branch to ease future conversion from 4 to 5?
>
> 1. Fully backport saving diff pair dimensions to v4, but only write them
> to the file if they already existed in it at load. This way, v4
> writes files compatible with older v4 by default, but if editing a
> v5 file will not lose the data.
>
> or:
> 2. Specifically ignore these options on load, since dropping them
> doesn't actually lose any PCB objects.
>
> or:
> 3. Update the version number checker code I wrote before to have both
> Warnings and Errors, using Warnings when ignoring the unknown object
> and loading the board anyway will not lead to "important" data loss.
> Add these attributes to a list of unknown objects that generate
> Warnings.
How about adding an additional section in the .pcb/.sch files describing
all objects used together with required versions and their descriptions,
e.g:
(object-info
(object "diff_pair_gap" ( minimum_version 4 ) ( severity warning )
(message "This file contains differential pair gap settings that come
with XXXX version of Kicad. Older versions will not respect the defined
gap settings ) )
(object "fancy_geom_shape" ( minimum_version 12345 ) ( severity error )
)
Cheers,
Tom
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