Re: WTF: All those eclipse packages (and som gcj questions)
On 17.12.05 12:20:53, Michael Koch wrote:
> On Sat, Dec 17, 2005 at 01:59:54AM +0100, Andreas Pakulat wrote:
> > Hi,
> >
> > I do find it really great to have eclipse in debian (finally). Only I'm
> > a little confused by all those new packages. So here come my questions,
> > please someone shed some light on this:
> >
> > 1. Do I understand correctly that the "ecj" is a java 1.3/1.4 compiler
> > that I can get either as "pure-java-version" (via eclipse-ecj) or as
> > native binary (via eclipse-ecj-gcj). What benefits has ecj above gcj?
>
> ECJ from Eclipse 3.1.x is a Java 5.0 compliant compiler. It can handle
> all language enhancements of Java 5.0. GCJ 4.0 and the upcoming 4.1
> cannot handle Java 5.0 stuff. They are more or less Java 1.4 compliant
> with support for some classes from 5.0 but no language extensions.
> GCJ can produce bytecode OR native code. ECJ can only produce bytecode.
> A natively compiled ECJ is mostly faster in producing byecode than GCJ.
Hmm, how could I benefit from ecj from within eclipse? I mean, what do I
need to change in the preferences so that Eclipse uses ecj-gcj to
compile java classes?
> > 2. Those eclipse-* packages that have a eclipse-*-gcj counterpart: Is
> > the gcj-version (i.e. natively compiled plugins) faster? What are their
> > benefit above the normal variant?
>
> When running eclipse with GCJ eclipse is much faster when the
> eclipse-*-gcj packages are installed because GCJ only integrates a
> simple interpreter, no JIT, and it can run the native code then.
Hmm, that raises another question: How to do that? I can of course
changed the java/javac alternatives to gcj but I'd like to leave the
default java to be SUN's. Now specifying JAVA_HOME to be /usr doesn't
work either, eclipse still uses "java" to execute. Using /usr/lib/jvm as
JAVA_HOME gives an error message from eclipse telling me it's missing a
binary.
BTW: Why do I have 2 alternatives for "java" coming from GCJ? One points
to /usr/lib/jvm/java-gcj/bin/java the other one pointing to
/usr/bin/gij-wrapper-4.0.
Andreas
--
You will have a long and boring life.
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