RFR: 8292329: Enable CDS shared heap for zero builds [v2]

[Ioi Lam]

On Tue, 23 Aug 2022 16:56:08 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> That doesn't work because `check-jvm-feature` requires `JVM_VARIANT` to be set, but `CreateCDSArchive` is not called in a context where  `JVM_VARIANT` is set. ( `JVM_VARIANT` is set only in a few specific places in Main.gmk, etc).
>> 
>> One option is to change the foreach loop a few lines below to:
>> 
>> 
>>   $(foreach JVM_VARIANT, $(JVM_VARIANTS), \
>>     $(eval $(call CreateCDSArchive,)) \
>>   )
>> 
>> 
>> But I've not seen `JVM_VARIANT` being used this way, so I am a little hesitant about doing it.
>
> Is the CDS archive dumped in a JVM variant specific way? If so, then it would make sense to dump it for each configured variant.

Yes, it's dumped in a different directory depending on the JVM variant. The contents of the CDS archive is specific to the particular libjvm.so that created the archive.

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PR: https://git.openjdk.org/jdk/pull/9984