Friday, February 24, 2012

Building project Penrose (or OpenJDK 8)

As OpenJDK Project Penrose was approved last week, I started looking at getting set up to actually be able to contribute to OpenJDK and Penrose.
As I had never built OpenJDK before I started looking for the build page. While OpenJDK build page says that there is no OpenJDK 8 build readme yet, the link behind the 'coming soon' text actually contains some useful information but it relates to old versions of Linux and I want to get this working on Fedora 16 :)

Currently the Penrose codebase is still the same as the Jigsaw code base, so the steps below also apply to building Jigsaw, and they also work for plain OpenJDK 8.
At some point there will be changes in the Penrose codebase, but I don't expect that they will change the build process much, if at all.

While Julien Ponge nicely describes how to get this working on Ubuntu, the steps are a bit different on Fedora 16, so I'm documenting here how to get started from a fresh new Fedora 16 machine.

Get a few dependencies first:
# set up gcc and the static version of libstdc++
sudo yum install gcc gcc-c++ libstdc++-static

# install build deps on alsa, freetype and cups
sudo yum install alsa-lib-devel freetype-devel cups-devel

# install some X11 headers
sudo yum libXt-devel libXext-devel libXrender-devel libXtst-devel

# get mercurial
sudo yum install mercurial

# install Java 7 and ant
sudo yum install java-1.7.0-openjdk-devel ant

Now clone the whole forest of Mercurial trees (you can also use fclone with the Forest extension instead, which will save you from doing calling the bash script manually):
$ hg clone http://hg.openjdk.java.net/penrose/jigsaw pj
$ cd pj
$ bash get_source.sh

Set the following environment variables:
export LANG=C
export ALT_BOOTDIR=/usr/lib/jvm/java-1.7.0-openjdk
export ALLOW_DOWNLOADS=true

At this point 'make sanity', which does a rough check on the setup, should succeed:
$ make sanity
...
Sanity check passed.

Ok, we're ready to build:
$ make
... go for a coffee, walk the dog, book a holiday
... after quite a while you'll see that it's finished
-- Build times ----------
Target all_product_build
Start 2012-02-24 08:15:23
End   2012-02-24 08:52:47
00:00:58 corba
00:17:31 hotspot
00:00:19 jaxp
00:00:23 jaxws
00:17:44 jdk
00:00:29 langtools
00:37:24 TOTAL
-------------------------

There you go, you built Penrose and the result is a JDK 8 installation based on the Penrose codebase:
$ cd build/linux-i586/jdk-module-image/bin
$ ./java -version
openjdk version "1.8.0-internal"
OpenJDK Runtime Environment (build 1.8.0-internal-david_2012_02_24_08_15-b00)
OpenJDK Client VM (build 23.0-b11, mixed mode)

Looking forward to start hacking around in the code :)

Thanks to Andrew Haley and Alan Bateman for helping me with some issues I came across along the way.

2 comments:

Andrew Haley said...

For deps, you'd be better off with

yum-builddep java-1.6.0-openjdk

davidb said...

Another tip from Andrew Haley:

In relation to the libstdc++-static dependency:
Passing STATIC_CXX="false" will also work and is preferable. This is what we do in IcedTea.