select need be able to recognise exec_compatible_with and target_compatible_with

Description of the feature request:

my project import rules_proto and grpc, when I cross compile for arm, rules_proto will choose a wrong platform protoc, host platform protoc expected but arm platform protoc choosed, but I think it’s not rules_proto’s bug, for:

my platforms value pass to bazel was

platform(
    name = "linux_gcc11_aarch64_none_musleabi",
    constraint_values = [
        "@platforms//cpu:aarch64",
        "@platforms//os:linux",
        ":gcc_11",
        ":musleabi",
    ],
)

toolchain defined by myself:

toolchain(
    name = "gcc11_arm_aarch64_none_gnueabi_xcompile_toolchain",
    exec_compatible_with = [
        "@platforms//cpu:x86_64",
        "@platforms//os:linux",
    ],
    target_compatible_with = [
        "@platforms//cpu:aarch64",
        "@platforms//os:linux",
        "//platforms:gcc_11",
        "//platforms:gnueabi",
    ],
    toolchain = "@gcc11_arm_aarch64_none_gnueabi//:cc_toolchain",
    toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
)

rules_proto use select to decide use which platform protoc, cpu:x86_64 and os:linux from target_compatible_with will be recognised by rules_proto, so linux-aarch64 choosed, it’s a wrong choice, it didn’t recognise it’s a cross compile. so I think there exists two way to solve this problem:

1. rules_proto choose protoc by detect host platform, not by select
2. make bazel compitable with this situation, I think select should be able to recogise exec_compatible_with and target_compatible_with

alias(
    name = "protoc",
    actual = select({
        ":linux-aarch64": "@com_google_protobuf_protoc_linux_aarch64//:protoc",
        ":linux-ppc": "@com_google_protobuf_protoc_linux_ppc//:protoc",
        ":linux-s390x": "@com_google_protobuf_protoc_linux_s390_64//:protoc",
        ":linux-x86_32": "@com_google_protobuf_protoc_linux_x86_32//:protoc",
        ":linux-x86_64": "@com_google_protobuf_protoc_linux_x86_64//:protoc",
        ":macos-aarch64": "@com_google_protobuf_protoc_macos_aarch64//:protoc",
        ":macos-x86_64": "@com_google_protobuf_protoc_macos_x86_64//:protoc",
        ":windows-x86_32": "@com_google_protobuf_protoc_windows_x86_32//:protoc",
        ":windows-x86_64": "@com_google_protobuf_protoc_windows_x86_64//:protoc",
        "//conditions:default": "@com_github_protocolbuffers_protobuf//:protoc",
    }),
    visibility = ["//visibility:public"],
)

[meteorcloudy]

@sgowroji This issue belongs to the configurability team

[sgowroji]

Closing as stale. Please reopen if you’d like to work on this further.