Compilation of Openjdk7

First Step installation dependent
Execute the following shell

# 因为我已经装了ant和jdk（注意这个jdk，所以不再安装）sudo apt-get install buildessential gawk m4 libasound2-dev libcups2-dev libxrender-dev xorg-dev xorg-dev xutils-dev x11proto-print-dev binutils libmotif3 libmotif-dev

Step two download Install bootstrap JDK
: HTTP://WWW.ORACLE.COM/TECHNETWORK/JAVA/JAVASE/DOWNLOADS/JAVA-ARCHIVE-DOWNLOADS-JAVASE6-419409.HTML?SSSOURCESITEID=OTNCN
The bootstrap JDK used to compile the openjdk7 cannot be a high version, it must be JDK6 (remember the Tears of blood).
I installed it in/home/jasper/software/apache/jdk1.6.0_45.

Step three download Openjdk7 source code
: http://jdk7.java.net/source.html
Download down is a zip file, decompression can be.
I'll unzip it to/home/jasper/software/apache/openjdk_7u40.

Fourth step to modify Currencydata.properties date
Open File/home/jasper/software/apache/openjdk_7u40/openjdk/jdk/src/share/classes/java/util/currencydata.properties
Modify all dates in this file. such as the corresponding +n year, to ensure that all dates are within the last 10 years

Fifth step setting the environment variables required for compilation
Execute the following shell

CD/home/jasper/software/apache/openjdk_7u40/openjdk# Bootstrap The installation path of the JDK. Must fill inExportAlt_bootdir=/home/jasper/software/apache/jdk1.6.0_45# Allow automatic download dependenciesExportallow_downloads=true# Number of threads compiled in parallel, set to the same number of CPU coresExporthotspot_build_jobs=6Exportalt_parallel_compile_jobs=6# Compare the image of this build with the previous version. Exportskip_compare_images=true# Using Precompiled header files, not adding this compilation will be slowerExportUse_precompiled_header=true# What to compileExportbuild_langtools=trueExportbuild_hotspot=trueExportbuild_jdk=true# Set it to false to avoid build of parts such as Javaws and browser Java pluginsbuild_deploy=false# Set it to false to not build the installation package. Because there are some strange dependencies in the installation package# But even if you don't build it, you can already get a full JDK image, so don't build it.Build_install=false# The path where the compilation results are storedExportAlt_outputdir=/home/jasper/software/apache/openjdk_7u40/build# These two environment variables have to be removed, or something weird will happen.unsetJava_homeunsetCLASSPATH# output log? Make2>&1| Tee$ALT _outputdir/build.log# Compile settings check# Make Sanity

Note To see if there is a final error, such as error please install the corresponding dependency

The sixth step executes the following shell

cd /home/jasper/software/apache/openjdk_7u40/openjdkmake

PS: Please carry out all the shells mentioned above in one terminal.

Compilation of Openjdk7