This doesn't flip the default bazel version, but instead makes this repo
compatible with the current version and bazel 9.x. The primary changes
for 9.x support are adding new load statements for things that were
previously built in. This cascaded into a few dep updates to pull in
their missing load statement fixes.
Closes#26201
COPYBARA_INTEGRATE_REVIEW=https://github.com/protocolbuffers/protobuf/pull/26201 from keith:ks/add-support-for-bazel-9.x e8192d86b3c838f6c88d4a4adfebd07162debc0d
PiperOrigin-RevId: 878654773
#test-continuous
This creates a module extension for system python so that it can be used in bzlmod builds. The pip_parse setup (dynamically building a new repo) doesn't work in the new bzlmod model, so we use the regular pip extension pointed at system_python's interpreter.
Remaining work to get off WORKSPACE:
* The pip extension quickly fails in the case where there's no python available, unlike our system_python setup
* Our windows upb tests were never actually running python, and system_python doesn't work (and breaks under bzlmod due to the above issue)
* Some of the upb wheel tests still don't work on bzlmod yet because they depend on some very custom http_archive dependencies.
Closes#18750Closes#23313Closes#23307
PiperOrigin-RevId: 810995270
rules_python recommends not using "pip_deps" as a hub name unless the module is guaranteed to always be the root module, as the name must be unique between modules.
PiperOrigin-RevId: 715435028
This is needed to make protobuf/bazel package minimal for other proto rules.
Keep 4 public bzl files in upb/bazel. They end up under protobuf/bazel, and they are legitimately used by other repositories.
Move upb_proto_library_internal/* under bazel/private. Those are utilities used in the rules. Moving them one level deeper makes protobuf/bazel package clean for other rules.
Move build_defs.bzl and amalgamation under /upb/bazel. Those are utilities used in the build.
Move lua.BUILD and python* uner /python/dist. Those are used in the WORKSPACE dependency setup.
PiperOrigin-RevId: 621442236
