RFR: JDK-8201483 Make it possible to disable JVM features

[Erik Joelsson]

On 2018-04-12 09:53, Magnus Ihse Bursie wrote:
>> 12 apr. 2018 kl. 17:38 skrev Erik Joelsson <erik.joelsson at oracle.com>:
>>
>> Looks good. Especially adding those # header lines in basics.m4!
> Thanks!
>
> I'm actually thinking about splitting out a utils.m4 from basics.m4, for these kinds of helper functions. Sounds ok?
Yes, makes sense.

/Erik
>> I guess a future followup now is to get rid of the individual enable/disable args that are now redundant.
> Yes, that is the goal.
>
> /Magnus
>
>> /Erik
>>
>>
>>> On 2018-04-12 04:39, Magnus Ihse Bursie wrote:
>>> It is currently easy to add new JVM features to the JVM build, but it is not possible to remove features.
>>>
>>> With this change, features can be both added or removed from the default set. They are added using --with-jvm-features=f1,f2 and removed using --with-jvm-features=-f1,-f2. The syntax can be combined, so --with-jvm-features=dtrace,-nmt will enable dtrace but disable native memory tracking.
>>>
>>> I also included some additional code cleanup and fixes, such as printing the JVM feature set at the summary.
>>>
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8201483
>>> WebRev: http://cr.openjdk.java.net/~ihse/JDK-8201483-disable-JVM-features/webrev.01
>>>