在 Linux (aarch64) 编译 OpenJDK 8

环境信息

• 操作系统：Rocky Linux 9.4 (aarch64)
• Open JDK：OpenJDK 8u422
• Boot JDK：jdk8u421-linux-aarch64

编译 OpenJDK 需要有一个 JDK。

解压后当前目录结构如下：

/opt/
├── jdk1.8.0_421
│   ├── COPYRIGHT
│   ├── LICENSE
│   ├── README.html
│   ├── THIRDPARTYLICENSEREADME.txt
│   ├── bin
│   ├── include
│   ├── jre
│   ├── legal
│   ├── lib
│   ├── man
│   ├── release
│   └── src.zip
└── jdk8u422-b05
    ├── ASSEMBLY_EXCEPTION
    ├── LICENSE
    ├── Makefile
    ├── README.md
    ├── THIRD_PARTY_README
    ├── common
    ├── configure
    ├── corba
    ├── doc
    ├── hotspot
    ├── jaxp
    ├── jaxws
    ├── jdk
    ├── langtools
    ├── make
    ├── nashorn
    └── test

进入 jdk8u422-b05 目录。

构建

一、运行 configure，配置编译环境

bash configure --with-boot-jdk=../jdk1.8.0_421

由于本机是 minimal 安装的，需要安装以下依赖：

yum install -y zip unzip make gcc libXtst-devel libXt-devel libXrender-devel cups-devel freetype-devel alsa-lib-devel fontconfig-devel g++

如果缺少依赖项而失败，按照提示安装后再次运行。

配置完成后，会输出以下信息：

A new configuration has been successfully created in
/opt/jdk8u422-b05/build/linux-aarch64-normal-server-release
using configure arguments '--with-boot-jdk=../jdk1.8.0_421

Configuration summary:
* Debug level:    release
* JDK variant:    normal
* JVM variants:   server
* OpenJDK target: OS: linux, CPU architecture: aarch64, address length: 64

Tools summary:
* Boot JDK:       java version "1.8.0_421" Java(TM) SE Runtime Environment (build 1.8.0_421-b09) Java HotSpot(TM) 64-Bit Server VM (build 25.421-b09, mixed mode)  (at /opt/jdk1.8.0_421)
* Toolchain:      gcc (GNU Compiler Collection)
* C Compiler:     Version 11.4.1 (at /usr/bin/gcc)
* C++ Compiler:   Version 11.4.1 (at /usr/bin/g++)
  
Build performance summary:
* Cores to use:   1
* Memory limit:   1639 MB

二、编译 OpenJDK

make images

OpenJDK 8 不支持 --disable-warnings-as-errors，会将所有 warning 视为 error 从而停止编译。需要将 ./hotspot/make/linux/makefiles/gcc.make 的 WARNINGS_ARE_ERRORS = -Werror 注释掉。

编译完成后，输出以下信息：

----- Build times -------
Start 2024-09-21 22:56:18
End   2024-09-21 23:08:59
00:00:18 corba
00:00:24 demos
00:07:32 hotspot
00:00:24 images
00:00:10 jaxp
00:00:16 jaxws
00:03:12 jdk
00:00:18 langtools
00:00:07 nashorn
00:12:41 TOTAL
-------------------------
Finished building OpenJDK for target 'images'

编译成功后的 JDK 和 JRE 会在 ./build/linux-aarch64-normal-server-release 目录下的 j2re-image 和 j2sdk-image。

三、验证结果

./build/linux-aarch64-normal-server-release/images/j2sdk-image/bin/java -version

编译成功，输出以下信息：

openjdk version "1.8.0_422-internal"
OpenJDK Runtime Environment (build 1.8.0_422-internal-root_2024_09_21_22_56-b00)
OpenJDK 64-Bit Server VM (build 25.422-b00, mixed mode)

参考资料

• jdk/doc/building.md