RFR: JDK-8200083: Bump bootjdk used for JDK 11 at Oracle to JDK 10

[Alan Bateman]

On 04/04/2018 22:00, Jonathan Gibbons wrote:
> Erik,
>
> Why bother?  What are you trying to achieve?
>
> Either the boot JDK is JDK 9, or it is JDK 10.  This should be a clear 
> decision.
>
> If internally at Oracle, we use 10, then as soon as code creeps in 
> that relies on 10 features, we've broken the commitment to the 
> community for allowing 9 as a boot JDK.
I agree, it's asking for trouble to have some people using JDK N-2 as 
the boot JDK, others using JDK N-1. This is on top of keeping boot cycle 
builds working where JDK N rebuilds itself, keeping the jrtfs and jimage 
support classes buildable with --release 8, and all the other build 
complexities. Using JDK N-1 as the boot JDK for the mainstream ports is 
hardly a burden as the required boot JDK is readily available. I could 
imagine it might be awkward for some ports that don't cross build but 
surely that shouldn't dictate how the mainstream builds.

-Alan