Public SourceMage Discussion List

[Javier Vasquez <j.e.vasquez.v AT gmail.com>]

On Sat, Mar 16, 2013 at 12:05 AM, Sukneet Basuta <sukneet AT gmail.com> wrote:
> On 15/03/13 07:06 PM, Javier Vasquez wrote:
>>
>> ...
>
> I'll to answer what I can, but as a disclaimer I've never compiled or tried
> to compile IcedTea.

Anything is appreciated...

>
> java-gcj-compat is redhat's version of gcj which is java 1.5 compliant. The
> one in gcc supports most of 1.4 and some of 1.5. IcedTea requires at a 1.5
> compliant JDK.

So if one is to install java-gcj-compat, which requires jcj any ways,
whould one install gcj with JDK emulation tree?

Would gcj + java-gcj-compat be enough to compile icedtea (no bootstrap)?

>
>> 2.-  Is gcc with java on version 4.7.2 cleaner than old 4.6.3 in test?
>>   It happens that on 4.6.3 there's missing stuff that breaks cleanse.
>
> Not sure, but I doubt it. gcj is only being maintained, so there shouldn't
> be any major changes to it. I'm not sure what the issue is with cleanse.

There are some things not installed when casting gcc with java and
with JDK tree emulation.

Please take a look at:

http://www.sourcemage.org/issues/492

Not sure if those are gone with 4.7.2...  As it takes time, I wanted
to know if anyone has tried gcc 4.7.2 with java without problems,
prior to compiling gcc with java again...

>
>> ...
>
> From briefly looking at Debian's files, it seems that they compile gcj, use
> that to compile ecj, and then use that to compile openjdk. Then icedtea is
> built with openjdk. It seems the gentoo allows for something similar as
> well, but allows ecj to compile icedtea. Look at the gentoo ebuild
> (http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/dev-java/icedtea
> /icedtea-7.2.3.8.ebuild?view=markup) for an idea of how to do it. You can
> also look at Debian's sources but they are generally less straight forward
> to understand IMO.
>
> It's supposed to be possible to compile icedtea with gcj, but I have no idea
> how practical it is or how easy it is to do. I assume there is issues with
> it since debian and gentoo seemingly use ecj.

This is a bit discouraging...  Having to buil/install ecj (probably
eclipse btw)...

>> ...
>
> If you just need to override certain things in PATH, just set the first
> elements in PATH to the ones you want to use. (i.e
> PATH=/override/bin:/usr/bin). It looks like They are just adding the build
> dir to PATH, after the bootstrap JDK. Also it looks like they are specifying
> everything in the configure flags, so it shouldn't be an issue. (btw, you
> may have to disable bootstrapping if you are compiling IcedTea7 -
> http://icedtea.classpath.org/wiki/CommonIssues#IcedTea7_building_on_systems_with_JDK_5_or_JDK_6).

Even more discouraging...  With latest java problems, even support for
java 6 has been announced to be discontinued by oracle...  So one
should think on java 7...

>>
>> 5.-  Are there any SMGL like instructions around there?
>
> Not that I'm aware of.

Hmm, I thought there were someones already attempting part of this.  I
remember an e-mail where someone mentioned his effort on trying using
gcj and not to depend upon binaries...

I'll look for that and ask directly the person, to see if he has
gotten any success, :-)

>
>> ...
>
> If your application only requires Java 1.5, then yes (AFAIK most
> applications require at least 1.6). Even then, it's very possible to run
> into problems if the application wasn't tested with gcj/classpath. Only the
> redhat version of gcj is 1.5 compliant FYI.

Sounds bad then, one really needs icedtead installed if needing a
compliant java...

OK, I have gcc 4.7.2, thanks to a mistaken commit, :-)  So perhaps the
1st thing I can do is to re-cast it with java and JDK tree emulation
to start with, and see if that doesn't break cleanse as 4.6.3 did...

Any ways as I re-compiled everything with native arch again, java is
broken on this x86 machine, :-) And there-s no java binary working,
not even the one compiled on the same machine with i686 arch, neither
IBM, oracle or gentoo binaries, which is weird...  So the only hope is
to build everything from scratch, :-)

We'll see.

Any other comments are also welcome, :-)

--
Javier.