Configuring the Compilation Environment

Installing Dependencies

Mount the OS image.
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mount YOUR_OS.iso /media -o loop
Replace YOUR_OS.iso with the actual iso package name.
Back up the repo file and clear the /etc/yum.repos.d/ directory.
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/etc/yum.repos.d-bakcp -r /etc/yum.repos.d rm /etc/yum.repos.d/*
Ensure that all repo files have been backed up. Enter y on the rm deletion page to delete the files.
Configure a local Yum source.
1. Open the /etc/yum.repos.d/Local.repo file.
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  vi /etc/yum.repos.d/Local.repo
2. Press i to enter the insert mode and add the following content to the file:
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  [Local] name=Local baseurl=file:///media/ enabled=1 gpgcheck=0
3. Press Esc, type :wq!, and press Enter to save the file and exit.
Make the Yum source configuration take effect.
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yum clean all yum makecache

Use the Yum source to install GCC related software.

yum -y install gcc gcc-c++ gcc-gfortran.aarch64 libgcc.aarch64 make cmake libtool autoconf automake ant wget git vim

Installing OpenJDK

Download and decompress the installation package to a directory (for example, /opt/tools/installed).

wget https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u252-b09/OpenJDK8U-jdk_aarch64_linux_hotspot_8u252b09.tar.gz
tar -zxf OpenJDK8U-jdk_aarch64_linux_hotspot_8u252b09.tar.gz
mkdir -p /opt/tools/installed/
mv jdk8u252-b09 /opt/tools/installed/

Configure Java environment variables.
1. Edit the /etc/profile file.
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  vi /etc/profile
2. Press i to enter the insert mode and add the following content to the end of the file:
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  export JAVA_HOME=/opt/tools/installed/jdk8u252-b09 export PATH=$JAVA_HOME/bin:$PATH
3. Press Esc, type :wq!, and press Enter to save the file and exit.
Make the environment variables take effect.
1
source /etc/profile

Check whether OpenJDK is successfully installed.

1	java -version

If the OpenJDK version is displayed in the command output, the installation is successful.

openjdk version "1.8.0_252"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_252-b09)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.252-b09, mixed mode)

Installing Maven

Download and install the installation package to a directory (for example, /opt/tools/installed).

wget https://archive.apache.org/dist/maven/maven-3/3.5.4/binaries/apache-maven-3.5.4-bin.tar.gz
tar -zxf apache-maven-3.5.4-bin.tar.gz
mv apache-maven-3.5.4 /opt/tools/installed/

Modify the Maven environment variables.
1. Edit the /etc/profile file.
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  vi /etc/profile
2. Press i to enter the insert mode and add the following content to the end of the file:
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  export MAVEN_HOME=/opt/tools/installed/apache-maven-3.5.4 export PATH=$MAVEN_HOME/bin:$PATH
3. Press Esc, type :wq!, and press Enter to save the file and exit.
Make the environment variables take effect.
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source /etc/profile

Check whether Maven is successfully installed.

mvn -v

The installation is successful if information similar to the following is displayed:

Apache Maven 3.5.4 (1edded0938998edf8bf061f1ceb3cfdeccf443fe; 2018-06-18T02:33:14+08:00)
Maven home: /opt/tools/installed/apache-maven-3.5.4
Java version: 1.8.0_252, vendor: AdoptOpenJDK, runtime: /opt/tools/installed/jdk8u252-b09/jre
Default locale: en_US, platform encoding: UTF-8
0S name: "linux", version: "4.14.0-115.el7a.0.1.aarch64", arch: "aarch64", family: "unix"

Modify the local repository path and remote repository in the Maven configuration file.

Open the configuration file.
```
vi /opt/tools/installed/apache-maven-3.5.4/conf/settings.xml
```
The default local repository directory is ~/.m2/. If you want to change the directory to a specified one, modify the localRepository tag. You do not need to modify this parameter unless otherwise specified.
Press i to enter the insert mode. Add the following content to the <mirrors> tag to configure the remote repository (change the repository to the Maven repository that you have built. If the Maven repository does not exist, configure it based on the following example):
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<mirror> <id>huaweimaven</id> <name>huawei maven</name> <url>https://mirrors.huaweicloud.com/repository/maven/</url> <mirrorOf>central</mirrorOf> </mirror>

Optional: If the compilation environment cannot access the Internet, add the following proxy configuration to settings.xml:

<proxies>
  <proxy>
    <id>optional</id>
    <active>true</active>
    <protocol>http</protocol>
    <username>Username</username>
    <password>Password</password>
    <host>Proxy server URL</host>
    <port>Proxy server port</port>
    <nonProxyHosts>local.net|some.host.com</nonProxyHosts>
  </proxy>
</proxies>

Press Esc, type :wq!, and press Enter to save the file and exit.

Installing sbt

Download sbt-0.13.15 to a specified directory (for example, /opt/tools/installed) and decompress it.

wget https://github.com/sbt/sbt/releases/download/v0.13.15/sbt-0.13.15.tgz
tar -zxf sbt-0.13.15.tgz
mv sbt /opt/tools/installed

Create the .sbt folder in the root directory of the current user and copy the repositories file to the .sbt folder.

The repositories section defines the sequence in which the Maven repositories are used during sbt compilation.

mkdir ~/.sbt
cp repositories ~/.sbt

The content of the repositories file is as follows:

[repositories]
local
kunpeng-maven: https://mirrors.huaweicloud.com/kunpeng/maven/
huawei-maven: https://mirrors.huaweicloud.com/repository/maven/
sbt-releases-repo: https://repo.typesafe.com/typesafe/ivy-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]
sbt-plugins-repo: https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]

Configure the SBT_HOME environment variable.
1. Open the /etc/profile file.
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  vi /etc/profile
2. Press i to enter the insert mode and add the following content to the profile file:
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  export SBT_HOME=/opt/tools/installed/sbt export PATH=${SBT_HOME}/bin:${PATH}
3. Press Esc, type :wq!, and press Enter to save the file and exit.
Make the environment variable take effect.
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source /etc/profile

Parent topic: Incremental-compiler Porting Guide (CentOS 7.6)