OpenJDK build instructions for Linux/Docker

Dockerfile

# This image builds OpenJDK 15 with Clang. Feel free to change the parameters as needed.
# Build instructions: https://openjdk.java.net/groups/build/doc/building.html
# Public domain code.

FROM ubuntu:20.04

RUN apt-get update && DEBIAN_FRONTEND="noninteractive" apt-get install -y \
  git autoconf file make zip curl clang libcups2-dev libxrandr-dev libxtst-dev libxt-dev libfontconfig1-dev libasound2-dev

WORKDIR /app

RUN git clone https://git.openjdk.java.net/jdk/ --branch jdk-15-ga --single-branch

RUN curl -O https://download.java.net/java/GA/jdk15.0.1/51f4f36ad4ef43e39d0dfdbaf6549e32/9/GPL/openjdk-15.0.1_linux-x64_bin.tar.gz && \
    tar xvf openjdk-15.0.1_linux-x64_bin.tar.gz && rm openjdk-15.0.1_linux-x64_bin.tar.gz

ENV JAVA_HOME=/app/jdk-15.0.1

RUN curl -O https://ci.adoptopenjdk.net/view/Dependencies/job/jtreg/lastSuccessfulBuild/artifact/jtreg-5.1-b01.tar.gz && \
  tar xvf jtreg-5.1-b01.tar.gz

WORKDIR jdk

RUN bash configure --with-toolchain-type=clang --disable-warnings-as-errors --with-jtreg=/app/jtreg

RUN make images

RUN ./build/*/images/jdk/bin/java -version

# optional (and slow)
RUN make run-test-tier1