RFR: 8213503: Build failure for SerialGC-only JDK

[Kim Barrett]

> On Nov 12, 2018, at 12:41 AM, David Holmes <david.holmes at oracle.com> wrote:
> 
> Hi Kim,
> 
> On 12/11/2018 2:37 PM, Kim Barrett wrote:
>> Please review this small (trivial?) change, fixing some G1GC
>> conditionalizations so that it is possible to configure and build a
>> JDK that only provides SerialGC.
>> CR:
>> https://bugs.openjdk.java.net/browse/JDK-8213503
>> Webrev:
>> http://cr.openjdk.java.net/~kbarrett/8213503/open.00/
> 
> That's one way to make it build, but ... I have to wonder whether the whole definition of the G1HeapRegionTypeConstant class and the registration of it:
> 
> register_type(TYPE_G1HEAPREGIONTYPE, false, true, new G1HeapRegionTypeConstant());
> 
> shouldn't all be conditional on having G1?

I missed JDK-8209802 when I ran into this problem.  Markus had a similar suggetion there.
I’ll follow up on that, and probably close this one as a duplicate.

> 
> Thanks,
> David
> -----
> 
>> Testing:
>> mach5 tier1 (mostly to verify changes still build normally).
>> Local build (linux-x64) configured with
>>   --with-jvm-features=-cmsgc,-epsilongc,-g1gc,-parallelgc,-zgc