X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-2.6 required=5.0 	tests=AWL,BAYES_00,SPF_PASS
X-Spam-Check-By: sourceware.org
Message-ID: <4B39942B.5040900@users.sourceforge.net>
Date: Mon, 28 Dec 2009 23:31:23 -0600
From: "Yaakov (Cygwin/X)" <yselkowitz AT users DOT sourceforge DOT net>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091204 Thunderbird/3.0
MIME-Version: 1.0
To: cygwin AT cygwin DOT com
Subject: Java alternatives (was Re: Updated: stable compiler package gcc4-4.3.4-3)
References: <announce DOT 4B22B280 DOT 2020708 AT gmail DOT com>
In-Reply-To: <announce.4B22B280.2020708@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

On 11/12/2009 14:58, Dave Korn wrote:
> As part of its infrastructure, GCJ uses the Eclipse Compiler for Java (ECJ)
> to compile .java sources files to bytecode .class files.  ECJ is shipped as
> a JAR file, and is not supplied in this distribution (pending resolution of
> licensing status and any self-hosting issues).  It can be downloaded after
> installation by running the supplied "/usr/sbin/download_ecj.sh" script, or
> can be manually downloaded from ftp://sourceware.org/pub/java/ecj-latest.jar,
> and moved and renamed to /usr/share/java/ecj.jar, which is where GCJ expects
> to find it.

I still don't understand what the problem/worry is with licensing.  ECJ 
is under the EFL-1.0, an OSI-approved license.

As for self-hosting, I am finishing up a build of JamVM with GNU 
Classpath that can build and run ecj, ant and its dependencies, 
jdk6-langtools (Sun javac/javah/javadoc/javap), and even GUI toolkits 
SWT, Java-GNOME, and QtJambi.

To that end, I would like to work out with you a change to the 
alternatives(8) management in gcc4-java.  Since it is difficult to 
adjust launcher scripts for Java programs to figure out which Java 
interpreter/compiler to use at runtime, I suggest that programs supply 
symlinks to /usr/bin/java, javac, etc., as so:

Master: gcj-4 -> gcj
Slaves: i686-pc-cygwin-gcj-4 -> i686-pc-cygwin-gcj, gcjh-4 -> gcjh, 
gij-4 -> gij

Master: gij-4 -> java
Slaves: /usr/share/java/libgcj-tools-x.y.z.jar -> /usr/lib/tools.jar

Master: gjavah-4 -> javah

Master: gjar-4 -> jar

Master: gappletviewer-4 -> appletviewer
Slaves: (Classpath tools) gjarsigner-4, gkeytool-4, gnative2ascii-4, etc.

All of these would be with a rank of 40.  Thoughts?

> There are problems with the Java compiler that are less well understood,
> but also manifest themselves as testsuite failures in the thread- and
> process-related tests.

I see there are some things that JamVM/Classpath are able to run that 
GIJ cannot; my classpath patches in Ports SVN may be helpful.

On an unrelated note, 
/usr/sbin/fix-libtool-scripts-for-latest-gcc-runtimes.sh in 4.3.4-3 does 
not have its executable bit set, so the postinstall attempt to call it 
fails (Permission denied).


Yaakov

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple