Ubuntu18编译openjdk11

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

1. Ubuntu版本信息

Ubuntu 18.04.4 LTS

2. 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

3. 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/

4. 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

5. 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

6. 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

8. 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

9. 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'

10. 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)