RFR 8211268: Disable unsupported GCs for Zero

[Erik Joelsson]

Hello,

Looks ok to me.

It will look confusing on linux-x64 where it first says:

checking if zgc should be built... yes

But then quietly disables it anyway. Not a big issue and probably not 
worth fixing given that zero on that platform is a rather rare 
configuration (unless for testing purposes).

/Erik


On 2018-09-28 02:49, Aleksey Shipilev wrote:
> RFE:
>   https://bugs.openjdk.java.net/browse/JDK-8211268
>
> Webrev:
>    http://cr.openjdk.java.net/~shade/8211268/webrev.01/
>
> Not all GCs are supported by Zero, because it requires implementing the GC barriers in C++
> interpreter. Now that we have jvm features that can selectively disable particular GCs, we can only
> build supported GCs. This avoids surprise build failures like these:
>    https://bugs.openjdk.java.net/browse/JDK-8211228
>
> Testing: x86_64 Zero build, running GCBasher with the rest of GCs
>
> Thanks,
> -Aleksey
>