ubuntu 20.04 编译openjdk8

0. 更换源(可选)

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
cd /etc/apt/
sudo sed -i "s@http://.*archive.ubuntu.com@http://repo.huaweicloud.com@g" /etc/apt/sources.list
sudo sed -i "s@http://.*security.ubuntu.com@http://repo.huaweicloud.com@g" /etc/apt/sources.list
sudo apt-get update

1. 下载openjdk

git clone https://github.com/openjdk/jdk
cd jdk
git checkout jdk8-b119

2. 下载jdk7

wget https://repo.huaweicloud.com/java/jdk/7u80-b15/jdk-7u80-linux-x64.tar.gz
tar -zxvf jdk-7u80-linux-x64.tar.gz
mv jdk-7u80-linux-x64 jdk1.7

3. 安装编译依赖

sudo apt install build-essential
sudo apt install libfreetype6-dev 
sudo apt install libcups2-dev
sudo apt install libx11-dev libxext-dev libxrender-dev libxrandr-dev libxtst-dev libxt-dev
sudo apt install libasound2-dev
sudo apt install libffi-dev
sudo apt install autoconf
sudo apt install ccache

4. 开始编译openjdk

编译文档：https://github.com/openjdk/jdk/blob/master/doc/building.md

cd ${openjdk8 home}
sudo bash configure --disable-ccache --with-debug-level=slowdebug --enable-debug-symbols ZIP_DEBUGINFO_FIELS=0  --with-boot-jdk=${jdk1.7 home}

5. 编译

sudo make images

6. 编译成功信息

## Finished images (build time 00:01:08)

----- Build times -------
Start 2021-09-29 15:36:01
End   2021-09-29 16:01:12
00:01:15 corba
00:00:51 demos
00:10:37 hotspot
00:01:08 images
00:00:37 jaxp
00:00:51 jaxws
00:07:25 jdk
00:01:54 langtools
00:00:33 nashorn
00:25:11 TOTAL
-------------------------
Finished building OpenJDK for target 'images'

7. 验证

./build/linux-x86_64-normal-server-slowdebug/jdk/bin/java -version
openjdk version "1.8.0-internal-debug"
OpenJDK Runtime Environment (build 1.8.0-internal-debug-root_2021_09_29_15_35-b00)
OpenJDK 64-Bit Server VM (build 25.0-b61-debug, mixed mode)

vim Test.java
public class Test {
    public static void main(String[] args) {
        System.out.println(System.getProperty("user.home"));
        System.out.println(System.getProperty("java.version"));
        System.out.println(System.getProperty("os.name"));
    }
}

./build/linux-x86_64-normal-server-slowdebug/jdk/bin/javac Test.java
./build/linux-x86_64-normal-server-slowdebug/jdk/bin/java Test
/home/test
1.8.0-internal-debug
Linux

异常1

check_os_version] Error 1

这个错误是因为不支持版本，这里先看看自己的内核版本
uname -r
我的内核版本是5.x

vim hotspot/make/linux/Makefile
SUPPORTED_OS_VERSION = 2.4% 2.5% 2.6% 3% 4% 5%

重新回到步骤5

异常2

top.make:91: ad_stuff] Error 2

这个错误是因为make参数的问题

vim hotspot/make/linux/makefiles/adjust-mflags.sh
大约67行的样子
s/ -([^        ][^    ]*)j/ -1 -j/
改成(注意是大写的i， 而不是竖线)
s/ -([^        I][^    ]*)j/ -1 -j/

重新回到步骤5

异常3

cc1plus: all warnings being treated as errors

这个错误是因为gcc版本的问题 gcc版本控制在5.0以下
sudo apt install gcc-4.8 g++-4.8
如果出现Package 'gcc-4.8' has no installation candidate
sudo vim /etc/apt/sources.list
deb http://dk.archive.ubuntu.com/ubuntu xenial main
deb http://dk.archive.ubuntu.com/ubuntu xenial universe
sudo apt update

配置新安装的gcc 4.8的启动优先级为100
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 100
配置新安装的g++ 4.8的启动优先级为100
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 100

vim hotspot/make/linux/makefiles/gcc.make
#WARNINGS_ARE_ERRORS = -Werror

重新回到步骤5

异常4

warning: [options] bootstrap class path not set in conjunction with -source 1.6

vim hotspot/make/linux/makefiles/rules.make
BOOT_SOURCE_LANGUAGE_VERSION = 7
BOOT_TARGET_CLASS_VERSION = 7

重新回到步骤5