RFR: 8255616: Disable AOT and Graal in Oracle OpenJDK

[mark.reinhold at oracle.com]

2020/11/4 14:53:47 -0800, vladimir.kozlov at oracle.com:
> On 11/3/20 2:51 AM, Volker Simonis wrote:
>> this is an interesting step and I wonder how it affects the OpenJDK
>> Graal, Metropolis and Leyden projects?
>> 
> ...
> 
> I will let Mark to talk about Project Leyden.
> 
> Best regards,
> Vladimir Kozlov
> 
> ...
>> 
>> - Project Leyden [?]: @Mark: what's actually the state of Project
>> Leyden? We had a discussion [3], a vote [4] and the approval of the
>> project [5] yet nothing has happened ever since. There's neither a
>> project page nor a mailing list.

Unfortunately, due to other priorities I haven’t had the time to get
this project started properly.  I hope to be able to do that soon.

>> Considering the fact that Leyden was supposed to "be based upon
>> existing components in the JDK such as the HotSpot JVM, the `jaotc`
>> ahead-of-time compiler, application class-data sharing, and the
>> `jlink` linking tool" I wonder if Leyden is already dead before its
>> instantiation if "jaotc", one of its core components, has now been
>> deprecated? Or are there any plans to enhance C2 for AOT scenarios?

We are considering the possibility of using C2 for ahead-of-time
compilation.

- Mark