编译环境
环境说明
Ubuntu 20.04.1 LTS
OpenJDK jdk8-b120
注意：Ubuntu 配置 apt 安装源为阿里源可以提高加载速度
设置 设置 apt 安装阿里源
1. 设置 apt 安装阿里源
sudo cp /ect/apt/sources.list /etc/apt/sources.list.bak
2. 添加阿里源
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
3. 更新源
sudo apt-get update sudo apt-get upgrade
下载 jdk 源码到本地
官网地址：openjdk.java.net/
github 源码地址： github.com/openjdk/
我的下载地址: gitee.com/zhengsh/jdk
下载命令:
# 由于github 国内网络太慢我已经将 openjdk 代码同步到 gitee ~/javawork$ git clone https://gitee.com/zhengsh/jdk.git
执行编译
1. 安装 open-jdk-8
sudo apt-get install openjdk-8-jdk
2.编译代码
# 执行编译 bash ./configure
3.错误提示：
configure: error: Cannot find GNU make 3.81 or newer! Please put it in the path, or add e.g. MAKE=/opt/gmake3.81/make as argument to configure.
# 我的是 make 没有安装 sudo apt-get install make #如果其它提示可以参考 java bug https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8027567
4.错误提示：
configure: error: Could not find a C compiler. You might be able to fix this by running 'sudo apt-get install build-essential'.
# 安装 build-essential sudo apt-get install build-essential
5.错误提示：
configure: error: Could not find all X11 headers (shape.h Xrender.h XTest.h Intrinsic.h). You might be able to fix this by running 'sudo apt-get install libX11-dev libxext-dev libxrender-dev libxtst-dev libxt-dev'.
# 安装 libX11-dev libxext-dev libxrender-dev libxtst-dev libxt-dev # 注意 libx11-dev 的 X 是小写 sudo apt-get install libx11-dev libxext-dev libxrender-dev libxtst-dev libxt-dev
6.错误提示：
configure: error: Could not find cups! You might be able to fix this by running 'sudo apt-get install libcups2-dev'.
# 安装 libcups2-dev sudo apt-get install libcups2-dev
7.错误提示：
configure: error: Could not find freetype! You might be able to fix this by running 'sudo apt-get install libfreetype6-dev'.
# 安装 libfreetype6-dev sudo apt-get install libfreetype6-dev
8.错误提示：
configure: error: Could not find alsa! You might be able to fix this by running 'sudo apt-get install libasound2-dev'.
# 安装 libasound2-dev sudo apt-get install libasound2-dev
9.成功提示
Tools summary: * Boot JDK: openjdk version "1.8.0_275" OpenJDK Runtime Environment (build 1.8.0_275-8u275-b01-0ubuntu1~20.04-b01) OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode) (at /usr/lib/jvm/java-8-openjdk-amd64) * C Compiler: x86_64-linux-gnu-gcc-9 (Ubuntu 9.3.0-17ubuntu1~20.04) version 9.3.0 (at /usr/bin/x86_64-linux-gnu-gcc-9) * C++ Compiler: x86_64-linux-gnu-g++-9 (Ubuntu 9.3.0-17ubuntu1~20.04) version 9.3.0 (at /usr/bin/x86_64-linux-gnu-g++-9) Build performance summary: * Cores to use: 1 * Memory limit: 3936 MB * ccache status: not installed (consider installing) Build performance tip: ccache gives a tremendous speedup for C++ recompilations. You do not have ccache installed. Try installing it. You might be able to fix this by running 'sudo apt-get install ccache'.
10.make all
# 错误提示，（解决方法降低 gcc 版本） make[6]: *** [/home/zsh/javawork/jdk/hotspot/make/linux/makefiles/vm.make:297: precompiled.hpp.gch] Error 1 make[5]: *** [/home/zsh/javawork/jdk/hotspot/make/linux/makefiles/top.make:119: the_vm] Error 2 make[4]: *** [/home/zsh/javawork/jdk/hotspot/make/linux/Makefile:289: product] Error 2 make[3]: *** [Makefile:217: generic_build2] Error 2 make[2]: *** [Makefile:167: product] Error 2 make[1]: *** [HotspotWrapper.gmk:45: /home/zsh/javawork/jdk/build/linux-x86_64-normal-server-release/hotspot/_hotspot.timestamp] Error 2 make: *** [/home/zsh/javawork/jdk//make/Main.gmk:109: hotspot-only] Error 2 # gcc --version gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0 Copyright (C) 2019 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # 安装 gcc-4.8 g++-4.8 sudo apt-get install -y gcc-4.8 sudo apt-get install -y g++-4.8 # 重新建立软连接 cd /usr/bin #进入/usr/bin文件夹下 sudo rm -r gcc #移除之前的软连接 sudo ln -sf gcc-4.8 gcc #建立gcc4.8的软连接 sudo rm -r g++ sudo ln -sf g++-4.8 g++ # 重新查询 gcc 版本 gcc --version gcc (Ubuntu 4.8.5-4ubuntu8) 4.8.5 Copyright (C) 2015 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11.make all 成功提示信息
----- Build times ------- Start 2020-12-12 22:17:38 End 2020-12-12 22:51:31 00:00:54 corba 00:01:03 demos 00:04:57 docs 00:16:08 hotspot 00:01:06 images 00:00:35 jaxp 00:01:05 jaxws 00:06:49 jdk 00:00:54 langtools 00:00:21 nashorn 00:33:53 TOTAL ------------------------- Finished building OpenJDK for target 'all'
编译成功
cd /javawork/jdk/build/linux-x86_64-normal-server-release/jdk/bin ./java -version # 到此 openjdk 编译成功 openjdk version "1.8.0-internal" OpenJDK Runtime Environment (build 1.8.0-internal-zsh_2020_12_12_22_17-b00) OpenJDK 64-Bit Server VM (build 25.0-b62, mixed mode)
总结
- 其实我没有看特别教程， 就参考了，OpenJdk 中的
README文件，然后结合提示解决问题 Google 解决问题。
- 系统要求，建议虚拟机在 4核心8G 内存不然过程比较漫长。
- 这些都是环境搭建层面上的东西，后续我将继续完善 openjdk 相关的笔记
