Wu Yudong's Blog

采用开源的OpenJDK版本，获取其源码的方式有两种：

（1）通Mercurial代码版本管理工具从Repository中直接取得源码，但是速度太慢，需要花费数小时

（2）直接下载官方打包好的源码包（推荐）

下载源码openjdk-7u6-fcs-src-b24-28_aug_2012.zip，解压，下载地址如下:

http://www.java.net/download/openjdk/jdk7u6/promoted/b24/openjdk-7u6-fcs-src-b24-28_aug_2012.zip

本次编译采用的是64位的OS，编译也是64位的JDK，内存至少需要512MB

1.基本流程

（阅读README和README-builds.html）

README-builds.html中包含有详细的安装信息，最好能完整的阅读一下。

2.安装基础软件包

我的centos6.5安装在vmware10上，安装时使用最小化(Minimal)安装

[root@localhost ~]# cat /etc/redhat-release
CentOS release 6.5 (Final)
[root@localhost ~]# uname -m
x86_64
[root@localhost ~]# uname -r
2.6.32-431.el6.x86_64

配置更新源

cd /etc/yum.repos.d/
curl http://mirrors.163.com/.help/CentOS6-Base-163.repo > CentOS6-Base-163.repo

当前wget还不能用

#wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
mv CentOS-Base.repo CentOS-Base.repo.bak
mv CentOS6-Base-163.repo CentOS-Base.repo
yum makecache

yum -y groupinstall 'base'
yum -y install make

安装jdk必备软件包:

yum -y install alsa-lib-devel
yum -y install cups-devel
yum -y install libXi-devel
yum -y install gcc gcc-c++
yum -y install libX*

上传或下载相关文件到/application/tools

mkdir -p /application/tools
cd /application/tools

上传或下载下列相关文件到/application/tools

freetype-2.3.12.tar.gz  下载地址：http://sourceforge.net/projects/freetype/files/freetype2/

openjdk-7u6-fcs-src-b24-28_aug_2012.zip  下载地址前文

apache-ant-1.7.1-bin.zip  下载地址：http://archive.apache.org/dist/ant/binaries/

jdk-6u26-linux-x64.bin  下载地址：http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase6-419409.html#jdk-6u26-oth-JPR

编译安装freetype：

tar -xzf freetype-2.3.12.tar.gz
cd freetype-2.3.12
./configure 
make
make install

安装JDK：

解压缩jdk-6u26-linux-i586.bin到application/java/目录下

设置环境变量如下：

#set java environment
JAVA_HOME=/application/java/jdk
export JRE_HOME=/application/java/jdk/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

安装ant：

cd /application/tools/
unzip apache-ant-1.7.1-bin.zip 
ln -s /application/tools/apache-ant-1.7.1/bin/ant /usr/bin/ant

检查java与ant：

[root@localhost ~]# java -version
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode)
[root@localhost ~]# ant
Buildfile: build.xml does not exist!
Build failed

3.配置变量

unset CLASSPATH
unset JAVA_HOME
export LANG=C
export ALT_BOOTDIR=/application/java/jdk
export ANT_HOME=/application/tools/apache-ant-1.8.1/
export ALT_FREETYPE_LIB_PATH=/usr/local/lib
export SKIP_DEBUG_BUILD=false
export SKIP_FASTDEBUG_BUILD=true
export DEBUG_NAME=debug
export ALT_FREETYPE_HEADERS_PATH=/usr/local/include/freetype2

4.检查环境是否配置OK与编译jdk源码

[root@localhost tools]# cd openjdk
[root@localhost openjdk]# pwd
/application/tools/openjdk
[root@localhost openjdk]# make sanity

……

OpenJDK-specific settings:
FREETYPE_HEADERS_PATH = /usr/local/include/freetype2
ALT_FREETYPE_HEADERS_PATH = /usr/local/include/freetype2
FREETYPE_LIB_PATH = /usr/local/lib
ALT_FREETYPE_LIB_PATH = /usr/local/lib

Previous JDK Settings:
PREVIOUS_RELEASE_PATH = USING-PREVIOUS_RELEASE_IMAGE
ALT_PREVIOUS_RELEASE_PATH =
PREVIOUS_JDK_VERSION = 1.6.0
ALT_PREVIOUS_JDK_VERSION =
PREVIOUS_JDK_FILE =
ALT_PREVIOUS_JDK_FILE =
PREVIOUS_JRE_FILE =
ALT_PREVIOUS_JRE_FILE =
PREVIOUS_RELEASE_IMAGE = /application/java/jdk
ALT_PREVIOUS_RELEASE_IMAGE =
Sanity check passed.

执行下列命令：

[root@localhost openjdk]# make all

Build times ———-
Target debug_build
Start 2015-05-05 09:34:37
End 2015-05-05 10:24:33
00:05:23 corba
00:10:49 hotspot
00:00:55 jaxp
00:01:07 jaxws
00:30:05 jdk
00:01:36 langtools
00:49:56 TOTAL
————————-
make[1]: Leaving directory `/application/tools/openjdk’

查看成果：

[root@localhost openjdk]#  ./build/linux-amd64/bin/java -version

openjdk version “1.7.0-internal-debug”
OpenJDK Runtime Environment (build 1.7.0-internal-debug-root_2015_05_05_09_15-b00)
OpenJDK 64-Bit Server VM (build 23.2-b09-jvmg, mixed mode)

参考资料

《深入java虚拟机》