These are the steps I had to take to build OpenJDK on my ubuntu installation. Hopefully I haven't forgotten too many things :-) Some of them are from the OpenJDK Build README and the open jdk repositories guide and the rest through trial+error+google.
- Install Mercurial and the forest extension. The forest.py and my ~/.hgrc (attached as "hgrc") files are attached. The forest.py attached works with mercurial 0.9.x, apparently there is a newer version that works with mercurial post-1.0.0
- Check out the mercurial repository in ~/sourcecontrol/jdk7
- $ hg fclone http://hg.openjdk.java.net/jdk7/tl mytl
- There are a bunch of libraries that need installing that can be found in the OpenJDK Build README. Also, if you install the "openjdk-6-source" package that installs all the dependencies.
- Install JDK 6
- Download the OpenJDK binary plugs. Go to the folder and run
- $ java -jar name-of-binary-plugs.jar
- select a location, the rest assumes ~/sourcecontrol/jdk7/mytl/ so the folder we need later will be ~/sourcecontrol/jdk7/mytl/openjdk-binary-plugins
- Set some environment variables
- ALT_BOOTDIR to the root of the JDK 6 installation. This must be the real jdk path, not the link found in /usr/bin, e.g:
- export ALT_BOOTDIR=/usr/lib/jvm/java-6-sun
- export ALT_BINARY_PLUGS_PATH=/home/kabir/sourcecontrol/jdk7/mytl/openjdk-binary-plugins
- Now go to the ~/sourcecontrol/jdk7/mytl folder
- replace hotspot/src/share/vm/libadt/port.hpp with the attached port.hpp
- $chmod 777 ./jdk/make/jdk_generic_profile.sh
- $./jdk/make/jdk_generic_profile.sh
- $make sanity
- This will tell you if there are some libraries you have not got installed
- $make WARNINGS_ARE_ERRORS=
- The "WARNINGS_ARE_ERRORS=" bit does not pass in the -Werror flag to gcc. With the -Werror flag some of the hotspot files fail to compile
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