Re: [gentoo-dev] Java 9 on Gentoo

[William L. Thomson Jr.]

On Sat, 18 Nov 2017 02:40:14 +0000
Peter Stuge <peter@×××××.se> wrote:

> William L. Thomson Jr. wrote:
> > > If you have any suggestions as to what I should look at to better
> > > understand the OpenJDK build system I would very much appreciate
> > > them.
> ..
> > Build OpenJDK stand alone. Get familiar with that.
>
> It used to be that one could not build OpenJDK without already having
> a working JDK. Has that changed with OpenJDK 9 (IIRC it was planned
> for OpenJDK 7 :) or not yet, and that is a reason for having icedtea
> in the mix?

Yes you are correct, nothing has changed there to my knowledge.

It has to bootstrap itself. No one goes all the way back to the
classpath 1.5 days, and boostraps up from pure source.
Build 1.5, then 1.6, then 1.7, then 1.8, etc...

Everyone at this point starts with some version of a working JDK
binary. Once icedtea-bins are were, those were used to build icedtea
from source.

If you want say icedtea you will see it pull in icedtea-bin. If you
want the latest, it will pull in the version older unless a -bin of the
latest exists. Which comes from  a working from source ebuild.
https://github.com/gentoo/java-overlay/blob/master/dev-java/icedtea/icedtea-3.7.0_pre00.ebuild#L139

Ideally there is also an openjdk ebuild that would build with either
icedtea-bin, or oracle-jdk-bin. Or could always add a open-jdk-bin like
the oracle one, and use it to build openjdk ebuild.

That is very complex. Even the icedtea from source ebuild is non
trivial. The only one who does major work there is the Icedtea author.
Which Gentoo luckily benefits from directly, but is not the intention.
That is their job at RedHat.

gnu_andrew in #gentoo-java (but please do not just bug him hes busy!)
https://www.linkedin.com/in/gnuandrew
https://github.com/gentoo/java-overlay/commits?author=gnu-andrew


-- 
William L. Thomson Jr.