[Proj] ABI version numbers

[Greg Troxel]

Howard Butler <howard at hobu.co> writes:

> On Thu, Nov 9, 2017 at 8:30 AM, Greg Troxel <gdt at lexort.com> wrote:
>
>> It would also be good if proj avoided changing the solib version if
>> there isn't an actual ABI change, and tried to avoid ABI changes unless
>> really necessary.
>
> Is there a way to compute that pre-release? The safe thing is to just
> ++ it, of course.

It requires paying attention.  Really anything that is an ABI change
should be clearly described in commit messages, those should be
reviewed/discussed before they are committed/merged, and the review
prcoess should in general ask if an ABI change lurks in the
commit/branch.

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