在Ubuntu下编译openjdk11
建议在配置环境的各个环节过程中拍摄快照
在此附上openjdk10/11的源码链接：
https://pan.baidu.com/s/15Q6axYE8aViUHSZGF9Iecg
提取码：hnip
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Ubuntu版本信息
Ubuntu 18.04.4 LTS
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编译openjdk11前需要一个Bootstrap JDK
一般情况下，编译Openjdk11时，需要前置JDk即Bootstrap JDK来编译当前需要编译的JDK，
一般选择，当前编译JDK版本之后的JDK，这里编译Openjdk11，选择Openjdk10作为Bootstrap JDK
# 上传并解压后为 jdk-10
tar -zxvf /usr/lib/jvm/openjdk-10+44_linux-x64_bin_ri.tar.gz
# 配置环境变量
sudo vim /etc/profile
# 配置信息如下
export JAVA_HOME=/usr/lib/jvm/jdk-10
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
# 刷新配置文件使其生效
source /etc/profile
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配置编译环境
编译的时候会用到Bootstrap JDK的jre目录下的lib库，这里只有JDK没有jre，因此需要创建一个jre目录，再把jdk的lib文件夹复制到jre目录下，执行以下命令：
mkdir /usr/lib/jvm/jdk-10/jre && cp -r /usr/lib/jvm/jdk-10/lib /usr/lib/jvm/jdk-10/jre/
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上传openjdk11至Ubuntu
# 上传并解压
unzip /usr/local/jason/openjdk/openjdk11-master.zip
# 修改名称为 jdk11
$ mv openjdk11-master jdk11
# 进入/usr/local/jason/openjdk目录
# 修改jdk11权限为root用户
chown -R root jdk11 && chgrp -R root jdk11
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安装编译所需软件
sudo apt-get install libfreetype6-dev
sudo apt-get install autoconf
sudo apt-get install libffi-dev
sudo apt-get install libasound2-dev
sudo apt-get install libx11-dev libxext-dev libxrender-dev libxtst-dev libxt-dev libxrandr-dev
sudo apt-get install libfontconfig1-dev
sudo apt-get install libcups2-dev
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进入jdk11检查编译环境
# 进入jdk11目录
sudo bash configure
# 有如下信息则配置完成
A new configuration has been successfully created in
/usr/local/jason/openjdk/jdk11/build/linux-x86_64-normal-server-release
using default settings.
Configuration summary:
* Debug level: release
* HS debug level: product
* JVM variants: server
* JVM features: server: 'aot cds cmsgc compiler1 compiler2 epsilongc g1gc graal jfr jni-check jvmci jvmti management nmt parallelgc serialgc services vm-structs'
* OpenJDK target: OS: linux, CPU architecture: x86, address length: 64
* Version string: 11-internal+0-adhoc.root.jdk11 (11-internal)
Tools summary:
* Boot JDK: openjdk version "10" 2018-03-20 OpenJDK Runtime Environment 18.3 (build 10+44) OpenJDK 64-Bit Server VM 18.3 (build 10+44, mixed mode) (at /usr/lib/jvm/jdk-10)
* Toolchain: gcc (GNU Compiler Collection)
* C Compiler: Version 7.5.0 (at /usr/bin/gcc)
* C++ Compiler: Version 7.5.0 (at /usr/bin/g++)
Build performance summary:
* Cores to use: 1
* Memory limit: 1958 MB
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按照指定条件生成配置
# –with-num-cores=8表示八核CPU参与编译
# --with-memory-size=8192表示8G内存参与编译
# --disable-warnings-as-errors忽略警告，直至编译完成。
sudo bash configure --with-num-cores=4 --with-memory-size=8192 --disable-warnings-as-errors
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开始编译
sudo make
# 漫长的等待……
Finished building target 'default (exploded-image)' in configuration 'linux-x86_64-normal-server-release'
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查看编译结果
# 进入下方目录
cd /usr/local/jason/openjdk/jdk11/build/linux-x86_64-normal-server-release/jdk/bin
# 查看编译结果
./java -version
openjdk version "11-internal" 2018-09-25
OpenJDK Runtime Environment (build 11-internal+0-adhoc.root.jdk11)
OpenJDK 64-Bit Server VM (build 11-internal+0-adhoc.root.jdk11, mixed mode)