[14]RFR: 8227439: Turn off AOT by default

[Claes Redestad]

Hi,

On 2019-07-19 23:27, Gustavo Romero wrote:
> Hi,
> 
> On 07/19/2019 01:32 PM, Igor Ignatyev wrote:
>> thanks for taking care of this and all the tests, appreciate that. As 
>> UseAOT used to be true by default, you should add to all places where 
>> AOTLibrary is used, e.g. in make/RunTests.gmk, and as it seems like an 
>> easy error (for our users) to make, I think we need to check that 
>> AOTLibrary has value only if UseAOT is true and generate an error at 
>> initialization time if it's not a case. this will help us and all the 
>> users to spot places where AOT was expected to kick in.
> 
> I just would like to understand better that decision.
> 
> JEP says (I assume since its beginning) that AOT was experimental,
> but then it was turned on by default and now turned off by default.
> 
> Is it (turn it off by default on 14) only because AOT should always
> be as experimental and turned off by default or it reflects some
> shift on plans to support AOT in the future?

as filer of this bug, my view is that it is simply righting a wrong:
AOT was (and is) experimental and should have been disabled by default
and guarded by -XX:+UnlockExperimentalVMOptions from the start. As such
this bug is not a statement about any current or future plans to support
JEP 295.

/Claes