RFR: 8248238: Implementation of JEP: Windows AArch64 Support

[Erik Joelsson]

On Fri, 18 Sep 2020 13:33:07 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> This is a continuation of https://mail.openjdk.java.net/pipermail/aarch64-port-dev/2020-August/009566.html
>>  
>> Changes since then:
>> * We've improved the write barrier as suggested by Andrew [1]
>> * The define-guards around R18 have been changed to `R18_RESERVED`. This will be enabled for Windows only for now but
>>   will be required for the upcoming macOS+Aarch64 [2] port as well.
>> * We've incorporated https://github.com/openjdk/jdk/pull/154 by @AntonKozlov in our PR for now and built the
>>   Windows-specific CPU feature detection on top of it.
>> 
>> [1] https://mail.openjdk.java.net/pipermail/aarch64-port-dev/2020-August/009597.html
>> [2] https://openjdk.java.net/jeps/8251280
>
> Build changes look good to me. I will take this branch for a spin.

Our linux-aarch64 build fails with this:
cc: error: unrecognized command line option '-std=c++14'
when compiling build/linux-aarch64/buildjdk/hotspot/variant-server/libjvm/objs/precompiled/precompiled.hpp.gch

I'm trying to configure a windows-aarch64 build, but it fails on fixpath. Is this something you are also experiencing,
and if so, how are you addressing it?

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PR: https://git.openjdk.java.net/jdk/pull/212