Does CDS archive generation work for crossbuilds?

[Thomas Stüfe]

Hi Alan,

On Sat, Oct 23, 2021 at 9:58 AM Alan Bateman <Alan.Bateman at oracle.com>
wrote:

>
>
> On 23/10/2021 07:57, Thomas Stüfe wrote:
> > Hi,
> >
> > when I crossbuild (for linux aarch64, using a devkit, building on linux
> > x64), for some reason I don't
> > get the classes.jsa generated inside the images directory.
> >
> > My configure options:
> >
> >
> --with-devkit=/shared/projects/openjdk/devkits/x86_64-linux-gnu-to-aarch64-linux-gnu
> > --openjdk-target=aarch64-linux-gnu
> > --with-boot-jdk=/shared/projects/openjdk/jdks/sapmachine17
> >
> --with-build-jdk=/shared/projects/openjdk/jdk-jdk/output-release/images/jdk
> > --with-gtest=/shared/projects/openjdk/gtest/googletest
> > --with-debug-level=fastdebug
> >
> > The build jdk is a freshly build x64 release VM from the same source
> tree.
> >
> > Am I missing something obvious? Is CDS archive generation even supported
> > for crossbuilds?
> It needs the generate run-time to execute "java -Xshare:dump" so I don't
> expect so. hotspot-runtime-dev is probably the place to discuss the
> details. BTW: this came up recently in the context of the jlink plugin
> that generates the CDS archive. The plugin needed a check to ensure that
> the target platform matched the current platform as it could launch the
> target VM to create the dump.
>
>
Thinking for a second, probably it cannot work since we copy binary
structures verbatim to the archive; I guess the chance that they are binary
compatible between platforms is very small. But it should be easily
rectified by calling Xshare:dump on the target platform.

Thank you!

..Thomas


> -Alan
>