Flag --incompatible_disable_starlark_host_transitions will break rules_foreign_cc examples in Bazel 7.0

[keertk]

Incompatible flag --incompatible_disable_starlark_host_transitions will be enabled by default in the next major release (Bazel 7.0), thus breaking rules_foreign_cc. Please migrate to fix this and unblock the flip of this flag.

The flag is documented here: bazelbuild/bazel#17032.

Please check the following CI builds for build and test results:

• Ubuntu 20.04 OpenJDK 11
• MacOS OpenJDK 11
• Ubuntu 18.04 OpenJDK 11
• MacOS OpenJDK 11
• Ubuntu 20.04 OpenJDK 11
• Windows OpenJDK 11
• Ubuntu 16.04 OpenJDK 8

Never heard of incompatible flags before? We have documentation that explains everything.
If you have any questions, please file an issue in https://github.com/bazelbuild/continuous-integration.

[jsharpe]

Hopefully fixed by #995

[keertk]

Hi @jsharpe I'm unfortunately still seeing errors here. Could you please check/reopen?
https://buildkite.com/bazel/bazelisk-plus-incompatible-flags/builds/1411#01860033-c8d9-4514-a425-4d25bb3fe01a

(01:13:59) INFO: Reading rc options for 'build' from /var/lib/buildkite-agent/builds/bk-docker-ft6b/bazel-downstream-projects/rules_foreign_cc/examples/.bazelrc:
--
  | 'build' options: --enable_runfiles --action_env=MSYS=winsymlinks:nativestrict
  | (01:14:00) ERROR: Traceback (most recent call last):
  | File "/var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/209e007714172698401b3a9abd2c0d64/external/rules_jvm_external/private/rules/javadoc.bzl", line 57, column 31, in <toplevel>
  | "_javadoc": attr.label(
  | Error in label: 'cfg = "host"' is deprecated and should no longer be used. Please use 'cfg = "exec"' instead.
  | (01:14:00) ERROR: Error computing the main repository mapping: at /var/lib/buildkite-agent/builds/bk-docker-ft6b/bazel-downstream-projects/rules_foreign_cc/examples/deps/deps_jvm_external.bzl:3:6: at /var/lib/buildkite-agent/.cache/bazel/_bazel_buildkite-agent/209e007714172698401b3a9abd2c0d64/external/rules_jvm_external/defs.bzl:19:6: initialization of module 'private/rules/javadoc.bzl' failed

[sgowroji]

Hi @jsharpe, Could you please share the latest update of this issue fix ? Thanks!

[jsharpe]

As far as I know there is no issue with the ruleset itself, just with the versions of the dependencies in use in the examples. I don't have a huge amount of time to investigate this but I think a bump to rules_jvm_external should be all that's required?

[jsharpe]

Without permissions to trigger the failing buildkite pipeline this is kind of hard to iterate on fixing too btw @sgowroji - any improvements to the CI to be able to independently check such failures would be very useful.

[meteorcloudy]

The log message actually provides good reproducing steps:

[sgowroji]

Hi @jsharpe, Did you get a chance to check this comment.