Switch to scala 2.12 or enbable building and publishing for both 2.11 and 2.12

[tfenne]

No description provided.

[nh13]

This could affect a few users, so I'd like to know the motivation.

[tfenne]

Umm, well scala 2.12 has been out for a while, including the first point release (2.12.1). Seems to me like most libraries at this point build for both 2.11 and 2.12 so people on both can use the jars in the public repos.

[nh13]

Sorry if my question wasn't clear, I haven't taken the time to look closely, but is there 2.13, 2.14, or other releases we will need to support too? My first question though was asking was: what is the motivation for 2.12? Is this based on a new project elsewhere, or that most libraries support both or ???

[tfenne]

For my part, there's enough stuff in 2.12 that I'd like to update projects where I can. Take a look here. One of the biggest changes is better interop with Java 8 features, and use of JVM/classfile features that came with Java 8 to make things smaller (jar sizes are decreased a fair bit on average) and offer some potential performance improvements. There's a new optimizer too which is supposed to make stuff faster, though I haven't tested.

[nh13]

Ok, so is there any reason to stick to 2.11 then?

[tfenne]

For ourselves, probably not. For anyone else who's using any part of dagr or fgbio as a library, moving wholesale to 2.12 means that there would be no future releases or bugfixes on 2.11