[Buildroot] [PATCH v4 0/3] OpenJDK: new package and tests

[Matthew Weber]

Romain,


On Mon, Feb 4, 2019 at 2:56 AM <aduskett at gmail.com> wrote:
>
> From: Adam Duskett <Aduskett at gmail.com>
>
>
> This patch series adds OpenJDK and an updated testing framework to BuildRoot.
>
> A previous patch series for OpenJDK8 used the JDK Muricle page to download a
> tarball. Instead, what I have chosen to do is use the AdoptOpenJDK GitHub
> repository. This repository allows us to use the GitHub macro instead of trying
> to provide a nasty workaround when grabbing the source code.
>
> With this patch series, there are some quirks that I would like to detail:
>
> - The openjdk-bin package:
> From http://hg.openjdk.java.net/jdk10/jdk10/raw-file/tip/common/doc/building.html#boot-jdk-requirements
> "Paradoxically, building OpenJDK requires a pre-existing JDK. This is called
> the "boot JDK." The boot JDK does not have to be OpenJDK, though. If you are
> porting OpenJDK to a new platform, the chances are that there already exists
> another JDK for that platform that is usable as boot JDK.
>
> The rule of thumb is that the boot JDK for building JDK major version N should
> be a JDK of major version N-1, so for building JDK 9, a JDK 8 would be suitable
> as boot JDK."
>
> This paradox causes an issue because every distribution I have used comes with
> JDK8 by default. So there are two solutions that I could come up with:
> 1) Require the host-system to have JDK N-1
> 2) Grab the convenient and easy to install binaries from the AdoptOpenJDK
>    repository, and use those binaries as the boot-jdk.
>
> - JDK >= 10 requires X11, even if building a headless version.
>   It's unfortunate, but there isn't anything I cared to do about it.
>
> - Running "make install" installs the entire JDK to the target directory,
>   which is why INSTALL_TARGET is manual.
>
> - The OpenJDK package:
>
> - Depending on !BR2_SOFT_FLOAT
> From http://hg.openjdk.java.net/jdk10/jdk10/raw-file/tip/common/doc/building.html#building-for-armaarch64
> "Note that soft-float ABIs are no longer properly supported on OpenJDK."
> Yes, it compiles as of right now, but I don't want to have to help people with
> possible ASM java bugs because they wanted to use a processor without an FPU.
>
> - Requiring GLIBC
> OpenJDK could probably build against uClibc with a few patches, but I decided
> against going through the effort of doing so. My reasoning is that uClibc
> advertises itself as a small C library, however, at this time, OpenJDK comes in
> at over 100MB for a minimal install. So the few megabytes saved by using uClibc
> probably isn't going to be a concern for anybody wanting to use Java on their
> embedded environment.
>
> - Other thoughts:
> It is possible to use fine-grained make targets when building OpenJDK, check out
> http://hg.openjdk.java.net/jdk10/jdk10/raw-file/tip/common/doc/building.html#using-fine-grained-make-targets.
> Perhaps in the future, BuildRoot could have Java setup just like PHP or Python,
> with a large selection of modules to build? This fine-grained build could
> potentially save a massive amount of space.
>
> Perhaps in the future, a patch set that removes the X11/Alsa/cups dependencies
> can be added.
>
> In addition to the OpenJDK patches, Matt Webber, Daniel Leach and
> Ricardo Martincoski extended the testing framework to allow for a more
> flexible and comprehensive testing environment. The first of which is to test
> OpenJDK by running a simple "Hello world" application.
>

Romain, thought I'd mention we are working on a follow-on series which
uses Valentin's LLVM work to do Just In Time(JIT) for openJDK!

>
> Comments and critiques are always welcome!
>
> Adam
>
> Daniel J. Leach (1):
>   support/testing: openjdk hello world
>
> Adam Duskett (5):
>   openjdk-bin: new package
>   openjdk: new package
>
> Adam Duskett (3):
>   openjdk-bin: new package
>   openjdk: new package
>   openjdk-hello-world: new test
>
>  .gitlab-ci.yml                                |   1 +
>  DEVELOPERS                                    |   3 +
>  package/Config.in                             |   1 +
>  package/openjdk-bin/openjdk-bin.hash          |   6 +
>  package/openjdk-bin/openjdk-bin.mk            |  23 +++
>  package/openjdk/Config.in                     |  58 ++++++++
>  package/openjdk/openjdk.hash                  |   3 +
>  package/openjdk/openjdk.mk                    | 135 ++++++++++++++++++
>  .../package/br2-external/openjdk/Config.in    |   1 +
>  .../br2-external/openjdk/external.desc        |   1 +
>  .../package/br2-external/openjdk/external.mk  |   1 +
>  .../package/openjdk-hello-world/Config.in     |  26 ++++
>  .../openjdk-hello-world/HelloWorld.java       |   8 ++
>  .../openjdk-hello-world.mk                    |  18 +++
>  support/testing/tests/package/test_openjdk.py |  42 ++++++
>  15 files changed, 327 insertions(+)
>  create mode 100644 package/openjdk-bin/openjdk-bin.hash
>  create mode 100644 package/openjdk-bin/openjdk-bin.mk
>  create mode 100644 package/openjdk/Config.in
>  create mode 100644 package/openjdk/openjdk.hash
>  create mode 100644 package/openjdk/openjdk.mk
>  create mode 100644 support/testing/tests/package/br2-external/openjdk/Config.in
>  create mode 100644 support/testing/tests/package/br2-external/openjdk/external.desc
>  create mode 100644 support/testing/tests/package/br2-external/openjdk/external.mk
>  create mode 100644 support/testing/tests/package/br2-external/openjdk/package/openjdk-hello-world/Config.in
>  create mode 100644 support/testing/tests/package/br2-external/openjdk/package/openjdk-hello-world/HelloWorld.java
>  create mode 100644 support/testing/tests/package/br2-external/openjdk/package/openjdk-hello-world/openjdk-hello-world.mk
>  create mode 100644 support/testing/tests/package/test_openjdk.py
>
> --
> 2.20.1
>
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-- 

Matthew Weber | Pr. Software Engineer | Commercial Avionics

COLLINS AEROSPACE

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