Problem with the cc_proto_library rule under Bazel 4.0.0

[Ajith Ramanathan]

Hi.  I've been having some problems using protocol buffers in a C++ project that, I believe, are directly related to Bazel 4.0.0.  I've verified that Bazel 3.7.2 does not have this problem.

The problem.  When I try and build a cc_proto_library I get the following message:

"Starting local Bazel server and connecting to it...

ERROR: C:/users/ajith/_bazel_ajith/vnwuv2iw/external/com_google_protobuf/BUILD:975:21: in proto_lang_toolchain rule @com_google_protobuf//:cc_toolchain: '@com_google_protobuf//:cc_toolchain' does not have mandatory provider 'ProtoInfo'.

ERROR: Analysis of target '//unnamed_project/main:attributes_cc_proto' failed; build aborted: Analysis of target '@com_google_protobuf//:cc_toolchain' failed

INFO: Elapsed time: 8.152s

INFO: 0 processes.

FAILED: Build did NOT complete successfully (18 packages loaded, 583 targets configured)"

My WORKSPACE configuration:

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(

  name = "com_google_absl_oss_federation",

  urls = ["https://github.com/abseil/federation-head/archive/deccf4d5b5b296134675d474d244f777d3e077ff.zip"],  # 2021-01-20T09:09:13Z

  strip_prefix = "federation-head-deccf4d5b5b296134675d474d244f777d3e077ff",

  sha256 = "f263ebcc648e62d5cc638fc47dddb737a8fa96b7db6b299b3e20cc9de4aa9b33",

)

load("@com_google_absl_oss_federation//:federation_deps.bzl", "federation_deps")

federation_deps()

# rules_proto defines abstract rules for building Protocol Buffers.

http_archive(

    name = "rules_proto",

    sha256 = "602e7161d9195e50246177e7c55b2f39950a9cf7366f74ed5f22fd45750cd208",

    strip_prefix = "rules_proto-97d8af4dc474595af3900dd85cb3a29ad28cc313",

    urls = [

        "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz",

        "https://github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz",

    ],

)

load("@rules_proto//proto:repositories.bzl", "rules_proto_dependencies", "rules_proto_toolchains")

rules_proto_dependencies()

rules_proto_toolchains()

And my .bazelrc:

build --cxxopt='-std:c++17'

[Yannic Bonenberger]

This is caused by an incompatible change: https://github.com/bazelbuild/bazel/issues/11694 

You need to upgrade your version of rules_proto to cfdc2fa31879c0aebe31ce7702b1a9c8a4be02d2 and it should work again.

Thanks,

Yannic

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[Ajith Ramanathan]

Apologies for being dense.  How do I find the list of available tar.gz's?  I need to also update the urls, but though I can directly download the previous url (which I got from the README), I can't navigate the github.com/bazelbuild/rules_proto/archives tree to find the one corresponding to the commit you pointed me to.  I'm probably publicly displaying my ineptitude...

Thanks!

[Yannic Bonenberger]

The URLs are https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/7e4afce6fe62dbff0a4a03450143146f9f2d7488.tar.gz and https://github.com/protocolbuffers/protobuf/archive/v3.13.0.tar.gz and the shamus is 9b4ee22c250fe31b16f1a24d61467e40780a3fbb9b91c3b65be2a376ed913a1a.

To view this discussion on the web visit https://groups.google.com/d/msgid/bazel-discuss/635b8811-008e-443f-833d-2cb2989f4c62n%40googlegroups.com.

[Ajith Ramanathan]

Thank you!