Linux Build:

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## Install MX
mkdir direktspeed
cd direktspeed
git clone https://github.com/graalvm/mx
export PATH=$PWD/mx:$PATH

## Install labs OpenJDK
https://github.com/graalvm/labs-openjdk-15/releases

#Verify
./build/labsjdk/images/graal-builder-jdk/bin/java --version

# expose
export JAVA_HOME=$PWD/build/labsjdk/images/graal-builder-jdk
export PATH=$PWD/build/labsjdk/images/graal-builder-jdk/bin;$PATH

## Compile graal
cd /direktspeed/
git clone https://github.com/oracle/graal/
cd graal

## Checkout dependencies
git checkout https://github.com/graalvm/graaljs.git

https://github.com/oracle/graal/tree/master/vm
sudo apt install zlib1g-dev build-essential zip unzip file cmake

cd graal/vm
git checkout vm-1.0.0-rc5
if you already checked out the graaljs or the sulong repositories: mx --env ce sforceimports, else skip this step
mx --env ce build

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sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-key C99B11DEB97541F0
sudo apt-add-repository https://cli.github.com/packages
sudo apt update
sudo apt install gh

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https://github.com/graalvm/labs-openjdk-15/releases/download/jvmci-20.3-b01/labsjdk-ce-15+36-jvmci-20.3-b01-linux-amd64.tar.gz

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$GRAALVM/jre/languages/js/graaljs.jar - core component of GraalVM JavaScript (always required)
$GRAALVM/jre/tools/regex/tregex.jar - Graal’s regular expression engine (always required)
$GRAALVM/jre/lib/boot/graal-sdk.jar - Graal’s SDK to implement languages (always required)
$GRAALVM/jre/lib/truffle/truffle-api.jar - Graal’s Truffle API, to implement language interpreters (always required)
$GRAALVM/jre/lib/graalvm/graaljs-launcher.jar - GraalVM JavaScript’s command line interpreter (optional)
$GRAALVM/jre/lib/graalvm/launcher-common.jar - Common launcher code shared by all languages (required by graaljs-launcher.jar)
$GRAALVM/jre/lib/boot/graaljs-scriptengine.jar - GraalVM JavaScript’s ScriptEngine/JSR 223 support (optional)

/path/to/jdk-11/bin/java -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseJVMCICompiler --module-path=$GRAAL_JDK11/graal/sdk/mxbuild/dists/modules/org.graalvm.graal_sdk.jar:$GRAAL_JDK11/graal/truffle/mxbuild/modules/com.oracle.truffle.truffle_api.jar --upgrade-module-path=$GRAAL_HOME/graal/compiler/mxbuild/dists/jdk15/jdk.internal.vm.compiler.jar:$GRAAL_HOME/graal/compiler/mxbuild/modules/jdk.internal.vm.compiler.management.jar -cp $GRAALVM/jre/lib/graalvm/launcher-common.jar:$GRAALVM/jre/lib/graalvm/graaljs-launcher.jar:$GRAALVM/jre/languages/js/graaljs.jar:$GRAALVM/jre/lib/truffle/truffle-api.jar:$GRAALVM/jre/lib/boot/graal-sdk.jar:$GRAALVM/jre/lib/boot/graaljs-scriptengine.jar:$GRAALVM/jre/tools/regex/tregex.jar com.oracle.truffle.js.shell.JSLauncher

run with jdk 11
compiler/mxbuild/dists/jdk11/

/path/to/jdk-11/bin/java -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseJVMCICompiler --module-path=$GRAAL_JDK11/graal/sdk/mxbuild/modules/org.graalvm.graal_sdk.jar:$GRAAL_JDK11/graal/truffle/mxbuild/modules/com.oracle.truffle.truffle_api.jar --upgrade-module-path=$GRAAL_HOME/graal/compiler/mxbuild/modules/jdk.internal.vm.compiler.jar:$GRAAL_HOME/graal/compiler/mxbuild/modules/jdk.internal.vm.compiler.management.jar -cp $GRAALVM/jre/lib/graalvm/launcher-common.jar:$GRAALVM/jre/lib/graalvm/graaljs-launcher.jar:$GRAALVM/jre/languages/js/graaljs.jar:$GRAALVM/jre/lib/truffle/truffle-api.jar:$GRAALVM/jre/lib/boot/graal-sdk.jar:$GRAALVM/jre/lib/boot/graaljs-scriptengine.jar:$GRAALVM/jre/tools/regex/tregex.jar com.oracle.truffle.js.shell.JSLauncher

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"java.configuration.runtimes": [
{
"name": "JavaSE-1.8",
"path": "/path/to/jdk-8",
},
{
"name": "JavaSE-11",
"path": "/path/to/jdk-11",
},
{
"name": "JavaSE-14",
"path": "/path/to/jdk-14",
"default": true
},
]

vscode

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# https://github.com/shyiko/jabba
# This file is intended to be "sourced" (i.e. ". ~/.jabba/jabba.sh")

export JABBA_HOME="$HOME/.open-pwa"

jabba() {
    #local fd3=$(mktemp /tmp/jabba-fd3.XXXXXX)
    #(JABBA_SHELL_INTEGRATION=ON $HOME/.jabba/bin/jabba "$@" 3>| ${fd3})
    #local exit_code=$?
    #eval $(cat ${fd3})
    #rm -f ${fd3}
    #return ${exit_code}
}

if [ ! -z "$(jabba alias default)" ]; then
    #jabba use default
fi

fish file

# https://github.com/shyiko/jabba
# This file is intended to be "sourced" (i.e. ". ~/.jabba/jabba.fish")

#set -xg JABBA_HOME "$HOME/.jabba"

#function jabba
#    set fd3 (mktemp /tmp/jabba-fd3.XXXXXX)
#    env JABBA_SHELL_INTEGRATION=ON $HOME/.jabba/bin/jabba $argv 3> $fd3
#    set exit_code $status
#    eval (cat $fd3 | sed "s/^export/set -xg/g" | sed "s/^unset/set -e/g" | tr '=' ' ' | sed "s/:/\" \"/g" | tr '\\n' ';')
#    rm -f $fd3
#    return $exit_code
#end

[ ! -z (echo (jabba alias default)) ]; and jabba use default

in bash rc
[ -s "/home/frank/.open-pwa/open-pwa.sh" ] && source "/home/frank/.open-pwa/open-pwa.sh"