Add support for building RISC-V JDK17 natively from openjdk/jdk-sandbox

[sxa]

I've left --with-native-debug-symbols=none and --custom-cacerts false in here for now purely to speed up the builds (particuarly since it won't be GA for a while - obviously both can be removed later if proven to work in a timely manner that doesn't slow the pipelines too badly) and hopefully once a conclusion on the VARIANT/VENDOR proposal is reached we can remove --disable-adopt-branch-safety but this will allow us to produce JDK17.

Note that the builds produced by this are currently likely to have a prereq of glibc2.31 for now (the version in Debian Sid) which is later than the other Linux builds we produce, but earlier than the glibc2.32 shipped with Fedora 33 (the other populate distribution for this platform).

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[karianna]

LGTM

[sxa]

Fixes adoptium/temurin-build#2625

[sxa]

NOTE: Will hold off on merging pending the completion of test builds at https://ci.adoptopenjdk.net/job/build-scripts/job/jobs/job/jdk17/job/jdk17-linux-riscv64-hotspot/ which will likely take a few hours

[sxa]

run tests

[eclipse-temurin-bot]

🟠 PR TESTER RESULT 🟠

❎ Some pipelines failed or the job was aborted! ❎
See the pipeline-build-check below for more information...

[sxa]

JDK18 pipeline test seemed to fail but I don't believe that is specific to this PR:

13:26:29  Compiling 229 files for BUILD_jdk.javadoc.interim
13:26:35  warning: unknown enum constant Feature.SEALED_CLASSES
13:26:35  warning: unknown enum constant Feature.SEALED_CLASSES
13:26:35  error: warnings found and -Werror specified
13:26:35  1 error
13:26:35  2 warnings
13:26:35  CompileInterimLangtools.gmk:97: recipe for target '/home/jenkins/workspace/build-scripts-pr-tester/build-test/jobs/jdk/jdk-linux-x64-hotspot/workspace/build/src/build/linux-x86_64-server-release/buildtools/interim_langtools_modules/java.compiler.interim

[sxa]

https://ci.adoptopenjdk.net/job/build-scripts/job/jobs/job/jdk17/job/jdk17-linux-riscv64-hotspot/5/console is running through ok - that is a temporary job created by me that will be superceded by an auto-generated one when this is merged.

[sxa]

@andrew-m-leonard Can you check that my assertion in the JD18 comment 2 above this one is valid [EDIT: Looks like some of the normal nightly JDK18s are failing with the same problem, so it definitely seems valid!] and if so approve please if you're ok with this change?

[andrew-m-leonard]

lgtm

[karianna]

All of the 18 builds failed with:

=== Output from failing command(s) repeated here ===
13:47:48  * For target buildtools_interim_langtools_modules_java.compiler.interim__the.BUILD_java.compiler.interim_batch:
13:47:48  warning: unknown enum constant Feature.SEALED_CLASSES
13:47:48  warning: unknown enum constant Feature.SEALED_CLASSES
13:47:48  error: warnings found and -Werror specified
13:47:48  1 error
13:47:48  2 warnings

However, that's a separate issue so merging this.

[karianna]

https://ci.adoptopenjdk.net/job/build-scripts/job/jobs/job/jdk17/job/jdk17-linux-riscv64-hotspot/5/console is running through ok - that is a temporary job created by me that will be superceded by an auto-generated one when this is merged.

Autogenerated one built OK but failed in a subsequent pipeline stage but that looks environmental https://ci.adoptopenjdk.net/job/build-scripts/job/jobs/job/jdk17/job/jdk17-linux-riscv64-hotspot/6/console