GCJ as Java SDK, dead, long live IcedTea!

geki · Last edited by geki on Wed Dec 10, 2008 11:17 am; edited 80 times in total

wrt the topic:
GCJ as Java SDK, dead(not quite true, yah...), long live IcedTea!(or... better to get things into OpenJDK quicker or so)
... there is always a con to a pro and a pro to a con .... bladat

have fun!

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icedtea-6 utilizes openjdk-6 core
: injects code of gnu-classpath instead of the binary plugs from sun
: implements openjdk-7 hotspot, thanks gnu_andrew

: experimental Xrender support to speedup Java2D code

geki, experimental version (can be found here)

dev-java/icedtea-6.1.4.14_pre20081209
: openjdk-6_beta14
: hotspot 14.0_build09

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gcj is just no true replacement for sun-jdk or blackdown-jdk
it is quite interesting to see how far it gets

gcj-overlay as of 20080429 unmaintained!

migrated packages for latest and greatest ported packages!

geki · Posted: Tue Nov 22, 2005 7:21 pm Post subject:

mod_gcj for Apache 1.3/2.0 looks quite interesting

_________________
hear hear

lancelott · Apprentice Joined: 29 Mar 2005 Posts: 152

I see you've updated this...

Anyway, would it be possible to just use the gcj that comes with gcc? I've found all the equivalents for the env variables except JAVA_HOME and JDK_HOME

geki · Posted: Mon Feb 27, 2006 12:02 am Post subject:

it looks ok to me. edit well, if you got some lib/ and include/ directories there.
have a look at my overlay then for java-config-2 integration.
_________________
hear hear

lancelott · Apprentice Joined: 29 Mar 2005 Posts: 152

I might just use your overlay. Seems like too much trouble otherwise. So does azureus work now?
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geki · Posted: Mon Feb 27, 2006 1:28 pm Post subject:

with gcj-4.1 / ecj it compiles/runs. no torrent d/l tested yet.
_________________
hear hear

geki · Posted: Thu Mar 02, 2006 6:55 pm Post subject:

fun post for my azureus merge times

my testbox is a centrino 1.6GHz with 512mb ram

gcj native library/binary build needs a lot of ram
you should have minimum 1gb ram better more... 2gb... 4gb... :twisted:

... otherwise you could get hardlocks after hours of swapping

geki · Posted: Sat Mar 04, 2006 3:11 pm Post subject:

update

zxy · Posted: Fri Apr 14, 2006 2:36 am Post subject:

@geki your links are down. Where to get your overlay?

geki · Posted: Fri Apr 14, 2006 10:09 am Post subject:

thanks, updated
_________________
hear hear

tchernobog · n00b Joined: 05 Jan 2004 Posts: 29

Okay, I'm experimenting the new overlay, and in particular gcj-jdk. Thanks guys for your wonderful work :-)

, you deserve it.

However, I've noticed some not-so-nice things:

Although the Eclipse-sdk ebuild says you need at least 768Mb of RAM to compile it (I've got exactly those), converting from JARs to to native libraries with gcj takes a lot more. In fact, after four hours of swapping to another 1Gb partition, my PC gave in and the Linux kernel killed the jc1 process. D'oh.
Probably you should change the ebuild to say "you need > 1.5Gb RAM to compile eclipse with gcj to native". In particular I've seen the org.eclipse.jdt.core*.jar going summing up into a >110Mb .s (assembler) file before the jc1 process was killed. That's quite insane for a ~7Mb JDT UI jar (the 'JDT core' one is about 4Mb) - at least IMHO. I wonder what the compiler is exactly doing under the hood.
1M$-worth question: Isn't there a way to unpack those JARs, compile every file separately and then link them together into a library again?

Cannot compile gjdoc due to an error about not finding a class from javax.xml. I wonder why the rest of the compilation process uses "javac" as a frontend (the one that comes with the gcj-jdk pkg, should be eclipse-ecj), while here gcj is called explicitly. It spits:

Code:

gcj --classpath=. -fassume-compiled -I./src -I. -I/usr/share/antlr/lib/antlr.jar -I. -g -O2 -c src/gnu/classpath/tools/doclets/xmldoclet/Driver.java -fPIC -o src/gnu/classpath/tools/doclets/xmldoclet/.libs/Driver.o
./src/gnu/classpath/tools/doclets/xmldoclet/doctranslet/DocTranslet.java:60: error: Class or interface `javax.xml.parsers.ParserConfigurationException' not found in import

I tried to run a program I did some time ago (a small Java chat program), which uses the AWT. Unfortunately, when I try to run "java Client" I get this error:

Code:

Exception in thread "Thread-1" java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit
at java.awt.Toolkit.getDefaultToolkit (libgcj.so.7)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment (libgcj.so.7)
at java.awt.Window.<init> (libgcj.so.7)
at java.awt.Frame.<init> (libgcj.so.7)
at javax.swing.JFrame.<init> (libgcj.so.7)
at frontend.LoginWindow.<init> (LoginWindow.java:32)
at Client.run (Client.java:35)
Caused by: java.lang.ClassNotFoundException: gnu.java.awt.peer.gtk.GtkToolkit
at java.lang.Class.forName (libgcj.so.7)
at java.lang.Class.forName (libgcj.so.7)
at java.awt.Toolkit.getDefaultToolkit (libgcj.so.7)
...6 more

Then I discovered it isn't the only program that gives me this problem: every program with a GUI does that (at least, in bytecode, haven't tried compiling to native yet). However, the libjawt.so symlink is in place, and lib-gnu-java-awt-peer-gtk.so is present and a quick "nm -DC" on it confirmed it is okay. "ldd libjawt.so" shows me it resolves correctly to "lib-...-peer-gtk.so".
Any ideas here on what I am doing wrong?

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codergeek42 · Posted: Thu Apr 20, 2006 4:19 pm Post subject:

Bug 21477: "java-config support for gcj" may interest you.

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geki · Posted: Thu Apr 20, 2006 4:54 pm Post subject:

tchernobog
gcj uses up to 1.4GB ram to build native libraries. not more.
ask the gcj developers why.
edit just wrong. saw one Jar eating more than 2GB

no idea about gjdoc issue. did not try to build it recently.
azureus does fine here.

codergeek42
I should have added a comment there. heh.
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hear hear

tchernobog · n00b Joined: 05 Jan 2004 Posts: 29

davidgurvich · Veteran Joined: 23 Apr 2004 Posts: 1063

I don't know about other ARCH, but on ppc I can run eclipse only with gcj as jvm. Crashes rapidly using ibm-jdk-bin. Only odd thing is memory use.

EDIT: I am using the java-experimental eclipse-sdk adding -compilelibs, not gcj.

davidgurvich · Veteran Joined: 23 Apr 2004 Posts: 1063

Have emerged eclipse-sdk-3.2_rc5 from gcj-overlay. Followed instructions from earlier to setup gcj-jdk and had to modify the ebuild on my ppc system in the following fashion:

irondog · Posted: Tue May 23, 2006 8:46 am Post subject:

Has anyone any idea why this code doesn't work with gjc.

geki · Posted: Tue May 23, 2006 8:59 am Post subject:

It seems the function is not implemented correctly or at all or ...
http://developer.classpath.org/doc/

edit
With GNU Classpath ImageIO.write wants your 'bla' to be a RenderedImage.
Is that incompatible?

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hear hear

irondog · Posted: Tue May 23, 2006 9:54 am Post subject:

geki · Posted: Tue May 23, 2006 10:00 am Post subject:

You should try gnu-classpath-generics as your bootclasspath to test a newer GNU Classpath version.
Otherwise I recommend you to report this on GNU Classpath's mailing list.
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hear hear

irondog · Posted: Tue May 23, 2006 10:57 am Post subject:

After emerging gnu-classpath-generics how can I use it for GCJ?

Thnx very much so far!
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geki · Posted: Tue May 23, 2006 11:05 am Post subject:

What I did:

davidgurvich · Veteran Joined: 23 Apr 2004 Posts: 1063

I've actually been using a second x86 box or school computers to run eclipse, prior to trying your method.
It has been very frustrating not being able to do certain things in linux on ppc.
Thank you.

geki · Posted: Tue May 23, 2006 11:40 am Post subject:

davidgurvich Please elaborate 'your method'.
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hear hear

davidgurvich · Veteran Joined: 23 Apr 2004 Posts: 1063

I meant using gcj as the jdk. With the java-experimental, migration, and gcj overlays. The first two are for porting gentoo's ebuilds to java-1.5 while allowing packages that require them to still use 1.4. The third, gcj-overlay , allows using gcj as the jdk.

There are various isssues, but no show-stoppers. I haven't tried to reinstall everything using gcj, but plan to do so in incremental fashion.

GCJ uses 2*RAM and half the CPU as ibm-jdk-bin running eclipse. Reasonable tradeoff as gcj requires a large amount of ram anyway and the ibm-jdk crashes eclipse. The result is an eclipse which runs quickly.