lib/libc/Versions.def: new symbol version for 12.x

[Daniel Eischen]

Sent from my iPhone
> On Jul 29, 2016, at 3:18 PM, Ed Schouten <ed at nuxi.nl> wrote:
> 
> 2016-07-29 21:10 GMT+02:00 Ed Maste <emaste at freebsd.org>:
>>> On 29 July 2016 at 14:53, Daniel Eischen <deischen at freebsd.org> wrote:
>>> 
>>> New symbol versions can be rolled back to -stable or other prior
>>> baselines.
>> 
>> If that happens I think having an FBSD_12.0 symbol in stable/11
>> actually makes it more clear what's happening, than if a FBSD_1.5
>> symbol appears in stable/11.
> 
> Yes, exactly. The version number would just indicate the version of
> -CURRENT that was used to introduce the symbol. If we would be going
> down this road, then I have to further questions:
> 
> - Should we drop the .0 suffix then?
> - Would it make sense to also name it to 'FreeBSD' instead of 'fBSD'?
> 
> That is, using 'FreeBSD_12' as the next symbol version.

They were originally modeled similar to Solaris (and Linux to some extent, IIRC):

https://docs.oracle.com/cd/E19683-01/806-4125/solarisabi-8/index.html

I think there's not much point of changing the naming scheme now, it's not like it's visible to the typical user.  The comment in the Version.defs file pretty much explains everything.

-- 
DE