src/hello_rust/BUILD.bazel

load(
    "@rules_fuchsia//fuchsia:defs.bzl",
    "fuchsia_component",
    "fuchsia_component_manifest",
    "fuchsia_package",
    "fuchsia_wrap_rust_binary",
    "if_fuchsia",
)
load("@rules_rust//rust:defs.bzl", "rust_binary", "rust_doc")


rust_binary(
    name = "hello_rust_native",
    srcs = ["src/main.rs"],
    edition = "2021",

    # Unfortunately, there doesn't seem to be a way of configuring these in
    # rust_toolchain.
    #
    # The Rust rules always use the C++ linker (clang++) which knows how to find
    # libc and libzircon, so we only have to specify the remaining libstd dep
    # here.
    #
    # We could use the newly-merged experimental_use_cc_common_link and then
    # supply stdlib_linkflags (which only works with cc link actions), but
    # that's a bit of a hack. It wouldn't solve panic=abort, which is needed by
    # our toolchain dist but not the upstream one.
    #
    # So what we probably need is our own macro to wrap this, or to modify
    # rules_rust somehow.
    deps = if_fuchsia(["@fuchsia_sdk//pkg/fdio"]),
    rustc_flags = [
        "-Cpanic=abort",
    ],
)

fuchsia_wrap_rust_binary(
    name = "hello_rust",
    native_binary = ":hello_rust_native",
)

fuchsia_component_manifest(
    name = "manifest",
    src = "meta/hello_rust.cml",
    includes = ["@fuchsia_sdk//pkg/syslog:client"],
)

fuchsia_component(
    name = "component",
    manifest = ":manifest",
    deps = [":hello_rust"],
)

fuchsia_package(
    name = "pkg",
    package_name = "hello_rust",
    visibility = ["//visibility:public"],
    components = [
        ":component",
    ],
)

rust_doc(
    name = "hello_rust_doc",
    crate = ":hello_rust",
)