Updated everything, got this odd message:

[Doug Simon]

> On 19 Jan 2017, at 12:46, Andrew Haley <aph at redhat.com> wrote:
> 
> On 18/01/17 20:45, Doug Simon wrote:
>> This explains why a jdk8 now needs to be also provided via --extra-java-homes mx option or the EXTRA_JAVA_HOMES env var.
> 
> aph at arm64:/nfs/zebedee/home/graal/graal-core$ mx build
> Could not find any JDK for building projects with compliance 1.8 (version 1.8)
> Enter path of JDK: /home/aph/jdk8-images/j2sdk-image/
> Persist this setting by adding "EXTRA_JAVA_HOMES=/home/aph/jdk8-images/j2sdk-image/" to /nfs/zebedee/home/graal/graal-core/mx.graal-core/env? [Yn]: n
>  File "/nfs/zebedee/home/graal/graal-core/mx.graal-core/suite.py", line 293 in definition of org.graalvm.compiler.api.replacements:
> JDK library JVMCI_API required by org.graalvm.compiler.api.replacements not provided by Java 1.8.0-internal (1.8) from /home/aph/jdk8-images/j2sdk-image/
> 
> But there is no JVMCI_API for JDK8 on AArch64…

You should be able to workaround this with:

export JVMCI_VERSION_CHECK=ignore
cp -R $JVMCI_JAVA_HOME/jre/lib/jvmci* /home/aph/jdk8-images/j2sdk-image/jre/lib

where $JVMCI_JAVA_HOME is the location of where https://github.com/dougxc/openjdk8-jvmci-builder/releases/download/jvmci-0.23/jdk1.8.0_111-jvmci-0.23-linux-amd64.tar.gz has been unpacked.

The second command above puts the JVMCI APIs into your JDK8 so that mx can resolve them.

-Doug