OpenJDK 10 zero For Mips32el java -version IncompatilveClassChangeError

[William Larson]

Hello Mikael,

I tried that and the configure said that both the boot and build jdk must
be N-1.

Hence JDK 9.

I would like to think this was only apart of JDK 10. But the link I
referenced for mips64el also used N-1 JDK11 for and JDK 12 build.

Thanks for your help,

Will


On Thu, Jun 4, 2020, 6:46 PM Mikael Vidstedt <mikael.vidstedt at oracle.com>
wrote:

>
> Looks like you’re using jdk9 as build jdk for jdk10. The build jdk does
> need to match the jdk you’re building. As Magnus points out in the email
> you linked to:
>
> "In theory, you should rebuild your buildjdk for each and every change
> ("make jdk CONF=buildjdk && make images CONF=mips"); but in reality, I
> don't believe there is really any need to rebuild the buildjdk (unless
> major changes in jlink/jmod happens).”
>
> There are likely to be some of those “major changes” between jdk9 and
> jdk10.
>
> Cheers,
> Mikael
>
> > On Jun 4, 2020, at 5:00 PM, William Larson <wlarsong at gmail.com> wrote:
> >
> > Hello,
> > I was able to successfully compile/build OpenJDK 10 with following
> configure
> >
> > bash configure
> > --openjdk-target=mipsel-oe-linux
> > --with-sysroot=/usr/local/oecore-i686/sysroots/mips32el-nf-oe-linux
> >
> --with-toolchain-path=/usr/local/oecore-i686/sysroots/i686-oesdk-linux/usr/bin/mipsel-oe-linux
> >
> --with-libffi=/usr/local/oecore-i686/sysroots/mips32el-nf-oe-linux/usr/src/debug/libffi/3.0.13-r0/libffi-3.0.13
> >
> > --with-jvm-variants=zero
> > --with-build-jdk=./jdk9/build/buildjdk/jdk
> > --with-boot-jdk=./jdk9/build/buildjdk/jdk
> >
> > I applied this patch to OpenJDK 10 as mips has 128 signals not 64
> >
> https://groups.google.com/forum/#!topic/linux.debian.bugs.dist/Tmgse0HIzDc
> >
> > I also Reference this mail from Magnus
> >
> https://mail.openjdk.java.net/pipermail/build-dev/2019-January/024735.html
> >
> > Where he suggests using a boot JDK
> >
> > CONF=linux-mipsel-normal-zero-release make images
> >
> > Works
> >
> > However if i copy the images to my QEMU based on the same sysroot and
> > compiler above I get
> >
> > ./java -version
> > Error occurred during initialization of boot layer
> > java.lang.IncompatibleClassChangeError: Implementing class
> >
> > If I copy the JDK folder just outside of images folder
> > (build/linux-mipsel-normal-zero-release/jdk) it works OK albeit it takes
> a
> > LONG time to print
> > ./java -version
> > openjdk version "10-internal"
> > OpenJDK Runtime Environment (build 10-internal+0-adhoc.will.jdk10)
> > OpenJDK Zero VM (build 10-internal+0-adhoc.will.jdk10, interpreted mode)
> >
> > Why is does
> > CONF=linux-mipsel-normal-zero-release make images
> > not work?
> > --
> > -William Larson
>
>