Ubuntu easy to compile OpenJDK

Spent three days on Windows OPENJDK, not familiar with bash, plus a variety of inexplicable dependencies and script bugs, physically and mentally exhausted. Finally make all the time produced a inexplicable error said what has warning and-werror to true, dead or alive no Google to-werror is what ghost, had to forget.

Today's rookie suddenly remembered, I also have Ubuntu virtual machine, right vote a try, did not expect easy success.

Platform: Ubuntu Version 5.1.30 (3.2.0-98-generic-pae #138-ubuntu SMP Mon Jan 13:11:12 UTC i686 i686 i386 gnu/linux)

Step 1: (Follow the commands in in-depth understanding of Java virtual Machines) One-click Download dependencies

1 sudo Install gawk M4 libasound2-dev libcups2-dev libxrender-dev xorg-dev xutils-dev x11proto-print-dev binutils libmotif3 Libmotif-dev Ant

It is not necessarily written here, but for the time being installed, the following if the lack of any reliance can be prompted to install, a Buddhist programmer's Day is to see recruit demolition.

OPENJDK's source code has C + + also has Java, so need a bootstrap JDK to compile Java part. This JDK is usually a version of the official JDK that you want to compile earlier than OPENJDK, which is the official readme-builds (under the root of the source downloaded in the second step) says:

... The general rule was that the bootstrap JDK must was an instance of the previous major releaseof the JDK.

Each version of the Readme-builds will indicate that this version of the OPENJDK required Bootstrap JDK specific version, such as openJDK8 need is jdk7u7 above the version, but not JDK8:

Step 2: Download the source code

sudo HG clone http://hg.openjdk.java.net/jdk8u/jdk8u-dev/cd jdk8u-dev  chmod755 get_source. SH . /get_source. SH

Download the latest source code for jdk8u with mercurial. Small partners If you want to download other versions of the source code can go here browse:http://hg.openjdk.java.net/. This download process takes about 30 minutes.

If you do not want to use mercurial, you can also download the zip package here: HTTP://JDK.JAVA.NET/JAVA-SE-RI/8 (in the lower side of the page RI source code there):

I compile on Windows is to use this ZIP package decompression compiled, and finally failed. Out of superstition, I decided to download the mercurial on Ubuntu, and the gods did not need to be ignored.

Step 3: Set Environment variables Create a new setup.sh and copy the following contents:

Export lang=C#bootstrap-JDK the installation path, replace it with your own bootstrap-path to the JDK export Alt_bootdir=/usr/lib/jvm/java-7-oracle-1.7.0.80Export Allow_downloads=trueExport Hotspot_build_jobs=8Export Skip_compare_images=true#要编译的内容, the reader can choose the export build_langtools according to their needs.=true#export Build_jaxws=false#export Build_jaxp=false#export Build_corba=falseExport Build_hotspot=trueExport BUILD_JDK=trueExport Skip_compare_images=trueBuild_deploy=falseBuild_install=false#编译结果存放的路径, it is recommended to store the OPENJDK source in the Build folder export Alt_outputdir=/usr/dev/jvm/openjdk/build# These two environment variables need to be removed, otherwise there will be a problem unset java_homeunset CLASSPATH

Run

./setup.sh

Set it all over again.

Step 4: Compile

It takes about twenty or thirty minutes to run make at the root of the OPENJDK source. It was supposed to run make sanity, but I ran into this error again ...

Mom Yo what ghost, search for a while no very results, so the chicken thief jumped over this step directly run make, unexpectedly successful, the output long after the success of this:

Ubuntu easy to compile OpenJDK