RFC: JamVM 2.0.0, the first release of JamVM with support for OpenJDK: IcedTea 1,2 & 3 update

[Andrew Hughes]

----- Original Message -----
> "JamVM 2.0.0 is the first release of JamVM with support for OpenJDK.
> Although IcedTea already includes JamVM with OpenJDK support,
> this has been based on periodic snapshots of the development tree."
> http://sourceforge.net/projects/jamvm/files/jamvm/JamVM%202.0.0/README/view
> 
> Its clear that IcedTea should update to support this first JamVM release
> that now officially support OpenJDK!
> 
> I have attached patched to update IcedTea 1, 2 & 3 to use JamVM 2.0.0.
> 
> Unlike the JamVM GIT snapshots the jamvm-2.0.0.tar.gz release do not
> contain the autoconf.sh script,
> instead the release contain a pre-generated configure script.
> I have patched IcedTea to use the official JamVM releases from now on
> and thus only rely on the configure script to be present.
> 

Yes, I saw the release and thought of doing the same, but haven't had time.

I'm much happier with a proper release than hacky snapshots, so I hope this
will continue.

> 
> While testing I noted that icedtea 3 configure --enable-jamvm
> builds are currently broken,
> jdk 8 rev ce71b7e69937 added a new JVM requirement to implement
> JVM_GetTemporaryDirectory
> I have filed a bugreport to track this regression:
> http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=2034
> 
> icedtea 3: configure --with-additional-vms=jamvm
> builds still succeed, libjava.so is then linked successfully against the
> hotspot libjvm.so
> openjdk.build/images/j2sdk-image$ ./bin/java -jamvm -version
> openjdk version "1.8.0_20"
> OpenJDK Runtime Environment (IcedTea 3.0.0pre02+rb27c53ea4272+) (Ubuntu
> build 1.8.0_20-b23)
> JamVM (build 2.0.0, inline-threaded interpreter)

Well, I believe the latter only avoids failing because it doesn't build the JDK against
the JamVM libjvm. This is why I don't support this way of building. It gives
a false hope that the build  has succeeded.

> 
> 
> icedtea 2: j2sdk-image$ ./bin/java -version
> java version "1.7.0_80"
> IcedTea Runtime Environment (2.6.0pre08+r17d957f63b11+) (Ubuntu build
> 1.7.0_80-b02)
> JamVM (build 2.0.0, inline-threaded interpreter)
> 
> 
> icedtea 1: j2sdk-image$ ./bin/java -version
> java version "1.6.0_32"
> IcedTea6 Runtime Environment (1.14.0pre+r3a715e42ffe4+) (Ubuntu build
> 1.6.0_32-b32)
> JamVM (build 2.0.0, inline-threaded interpreter)
> 
> 
> JamVM upstream and GIT its located at sourceforge.
> http://sourceforge.net/p/jamvm
> http://sourceforge.net/p/jamvm/code/ci/master/tree/
> http://sourceforge.net/p/jamvm/code/ci/master/tree/INSTALL
> 

There's an issue due to a new function introduced by the latest security
update:

http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=2032

(that's for CACAO, you probably want some for JamVM too)

so it's probably best to wait until this is resolved to save on having to
do two updates.

> Cheers
> Xerxes
> 
> 
> 
> 

-- 
Andrew :)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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