编译openjdk8==centos7.9编译openjdk8

之前用vbuntu编译过，这次用centos编译。

完成编译后的整个虚拟机

链接：https://pan.baidu.com/s/1ux0Mmd-szEINYcsoecRI1g 
提取码：1qyu 

需要编译的openjdk源码压缩包，后面需要编译的时候也可以去官网下载。

https://download.csdn.net/download/hebian1994/86501160

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1-安装依赖

yum install -y xrender
yum install -y freetype
yum install -y ccache
yum install -y zip unzip
yum -y install zlib zlib-devel
yum -y install bzip2 bzip2-devel
yum -y install ncurses ncurses-devel
yum -y install readline readline-devel
yum -y install openssl openssl-devel
yum -y install openssl-static
yum -y install xz lzma xz-devel
yum -y install sqlite sqlite-devel
yum -y install gdbm gdbm-devel
yum -y install tk tk-devel
yum -y install libffi-devel 
yum -y groupinstall "Development Tools" 
yum -y install libXtst-devel libXt-devel libXrender-devel
yum -y install alsa-lib-devel cups-devel libX* gcc gcc-c++ freetype-devel libstdc++-static ant make

yum install pcre-devel
yum install zlib zlib-devel
yum install openssl openssl-devel

yum -y install lrzsz
 

2-下载CentOS-7-x86_64-Minimal-2207-02.iso，用VMware安装。

CentOS Mirrors List

3-彻底删除原有JDK

rpm -qa | grep openjdk |xargs rpm -e --nodeps
rpm -qa | grep java |xargs rpm -e --nodeps

4-安装openjdk 1.8.0_342

yum install java-1.8.0-openjdk* -y

配置环境变量

 vim /etc/profile
 #在末尾添加
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.342.b07-1.el7_9.x86_64
JRE_HOME=$JAVA_HOME/jre
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

source /etc/profile

java -version

5-下载openjdk8u42的源码

下载地址：

        

6-开始编译

mkdir /opt/jdk

cd /opt/jdk

rz

选择下载的源码压缩包，上次后解压，得到openjdk目录

unzip openjdk-8u42-src-b03-14_jul_2022.zip

cd openjdk

chmod +x configure

./configure --with-debug-level=fastdebug --with-boot-jdk=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.342.b07-1.el7_9.x86_64

make clean make images

unset JAVA_HOME
unset CLASSPATH

make all

或者

./configure --with-target-bits=64 --with-boot-jdk=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.342.b07-1.el7_9.x86_64 --with-debug-level=slowdebug --enable-debug-symbols ZIP_DEBUGINFO_FILES=0

make CONF=linux-x86_64-normal-server-slowdebug

如果要用GDB进行调试，必须使用这种slowdebug方式进行编译

 

 

 

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7-在openjdk的build目录下cd到linux-x86_64-normal-server-fastdebug/jdk/bin， 可以看到熟悉的JDK的目录结构了

在bin目录下编写测试代码即可

cd /opt/jdk/openjdk/build/linux-x86_64-normal-server-fastdebug/jdk/bin
 

 [root@localhost bin]# ./java -version
openjdk version "1.8.0-internal-fastdebug"
OpenJDK Runtime Environment (build 1.8.0-internal-fastdebug-root_2022_08_25_16_54-b00)
OpenJDK 64-Bit Server VM (build 25.40-b25-fastdebug, mixed mode)

vim Test.java

public class Test{ public static void main(String args[]){ System.out.println("hello world!"); } } ​

[root@localhost bin]# ./javac Test.java 
[root@localhost bin]# ./java Test
hello world!
 

如果你有定制JDK某些类或方法（增删改）的需求，需要在解压后的源码目录下进行修改，源码目录位于：

openjdk/jdk/src/share/

8-更改JDK源码后，进行重新编译

cd /openjdk

./configure --with-debug-level=fastdebug --with-boot-jdk=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.342.b07-1.el7_9.x86_64

make clean make images