[Python][C++] Upgrade bazel 6 to bazel 8

[chaokunyang]

Feature Request

Upgrade bazel 6 to bazel 8 to use bazel module to manage dependencies.

Is your feature request related to a problem? Please describe

install_bazel in ci/run_ci.sh/ci/run_ci.py is a start point. And we may also need to WORKSPACE/BUILD file too.

pyx_library from grpc dependency may needs updates too.

Describe the solution you'd like

No response

Describe alternatives you've considered

No response

Additional context

No response

[XueSongTap]

Can I work on this？

[chaokunyang]

Can I work on this？

Sure, welcome!

[chaokunyang]

https://github.com/grpc/grpc/pull/38254 This can be taken as a reference

[XueSongTap]

hi @chaokunyang While migrating to Bazel 8 (with Bzlmod), I encountered an issue with some third-party dependencies that do not provide a native MODULE.bazel file (for example, simdutf).

It seems there are two possible ways to handle this:

1. Use the legacy WORKSPACE mechanism with http_archive, and enable it via the --enable_workspace flag — but this feels counter to Bazel 8’s push toward fully adopting Bzlmod.
2. Vendor the third-party dependency locally, for example add simdutf.h 、simdutf.cpp、MODULE.bazel and BUILD file at cpp/fory/thirdparty, and use local_path_override to integrate it via Bzlmod.

From a long-term maintenance and best practices standpoint, which approach is recommended for projects migrating to Bazel 8+?

Would appreciate some guidance — thanks!

[chaokunyang]

We will use bazel module in the long run. But we can do it step by step. We could first use --enable_workspace to upgrade to bazel 8 first, then switch to bazel module in another PR.

And simdutf.h didn't provide bazel support, fory just use its source file and create a cc_library rule for it:

# WORKSPACFE
http_archive(
    name = "simdutf",
    urls = ["https://github.com/simdutf/simdutf/releases/download/v6.1.2/singleheader.zip"],
    sha256 = "41bb25074fe1e917e96e539c7a87c502e530d88746d7c25d06fb55a28b884340",
    build_file = "//cpp/fory/thirdparty:BUILD",
)

# BUILD
cc_library(
    name = "simdutf",
    srcs = ["simdutf.cpp"],
    hdrs = ["simdutf.h"],
    includes = ["."],
    visibility = ["//visibility:public"],
)