Question about precompiled protoc

[MrDan4es]

Hello. In version 4.0, you removed the precompiled protoc, and now it recompiles frequently (bazelbuild/bazel#7095).
Alex Eagle presented a solution that replaces the original toolchain (https://github.com/aspect-build/toolchains_protoc), but now this solution is incompatible with the new version of build_stack_rules_proto.

module(name = "module")

...
bazel_dep(name = "toolchains_protoc", version = "0.5.0")
bazel_dep(name = "build_stack_rules_proto", version = "4.1.0")
...

protoc = use_extension("@toolchains_protoc//protoc:extensions.bzl", "protoc")
protoc.toolchain(
    google_protobuf = "com_google_protobuf",
    version = "v29.0",
)
use_repo(protoc, "com_google_protobuf")

register_toolchains("@build_stack_rules_proto//toolchain:standard")

When i trying to build any proto files with opts

common --per_file_copt=external/.*protobuf.*@--PROTOBUF_WAS_NOT_SUPPOSED_TO_BE_BUILT
common --host_per_file_copt=external/.*protobuf.*@--PROTOBUF_WAS_NOT_SUPPOSED_TO_BE_BUILT
common --per_file_copt=external/.*grpc.*@--GRPC_WAS_NOT_SUPPOSED_TO_BE_BUILT
common --host_per_file_copt=external/.*grpc.*@--GRPC_WAS_NOT_SUPPOSED_TO_BE_BUILT

i got gcc: error: unrecognized command-line option '--PROTOBUF_WAS_NOT_SUPPOSED_TO_BE_BUILT'

How can I use the toolchain from toolchains_protoc when building proto_plugin?
Thank you very much.

[MrDan4es]

If I understand correctly, the rule should implement support for the "--incompatible_enable_proto_toolchain_resolution" flag for this feature bazelbuild/rules_proto#213

[pcj]

@MrDan4es yes, this is good idea. I will try to get to this soon but a PR is welcome.