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To: Rene Bartsch <ML@...>
From: dalibor topic <robilad@...>
Subject: Re: GCJ with IcedTea classpath?
Date: Thu, 17 Jul 2008 12:54:19 +0200
Rene Bartsch wrote:
> Hi,
> if I'm understanding correctly, GCJ >= 4.3 is a fully compatible Java-VM
> and Java-Compiler. 
Not quite - GCJ makes no claims of full compatibility with any specific 
Java release.
> But the drawback is the incomplete classpath.
> On the other hand the OpenJDK classpath is incomplete due to proprietary
> code, too.
Not any more - the remainder of the OpenJDK class library has been freed 
over the past
year. There is a tiny slice of SNMP code left over, but that's not part 
of the platform specification,
so it's not necessary for a fully compatible implementation.
> Because of that Redhat added packages of the classpath to OpenJDK
> and called it IcedTea.
That was the world as it was a year ago, yeah. IcedTea has moved on to 
serve other duties meanwhile
(for example as integration point for Zero, gcjwebplugin/netx, etc.), 
since OpenJDK over the past year
completed the work on the proprietary encumbrancies (in collaboration 
with IcedTea, of course).
> So the question came to my mind whether it is possible to get a fully
> compatible JVM and native code compiler by combining GCJ with the IcedTea
> classpath?
Could be - but it would not be trivial work. For a start, you'd really 
want to decouple gcj from the existing classpath
class library, which it currently has to patch, and drag a copy around 
of. That's something that took
quite a while to accomplish for Kaffe, for example, as it is by no means 
a trivial task to do it right.

Then you'd want to introduce a shim layer for using an installed openjdk 
as its class library, and implement the
necessary low level interfaces in gcj.

Once you're done with that, you'd get in touch with me for a TCK license 
for OpenJDK, and spend a fair bit
of time working on fixing the issues exposed by the test suite making 
sure that you have a fully compatible combination.

dalibor topic

> Thanx for any hint ...
> Renne

gentoo-java@g.o mailing list

GCJ with IcedTea classpath?
-- Rene Bartsch
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