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Use the Sumatra JDK image you built as the JAVA_HOME for building Graal. Note we have been using the server build of Graal, so that the CPU methods get compiled with the -server compiler and Graal is used only for the HSAIL compilation in this configuration. For example:
$ export JAVA_HOME=/path/to/sumatra-dev/build/linux-x86_64-normal-server-release/images/j2sdk-image/
$ ./mx.sh --vmbuild product --vm server build
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