Rust

• rust_binary
• rust_library
• rust_library_group
• rust_static_library
• rust_shared_library
• rust_proc_macro
• rust_test
• rust_test_suite
• error_format
• extra_rustc_flag
• extra_rustc_flags
• capture_clippy_output

capture_clippy_output

capture_clippy_output(name)

Control whether to print clippy output or store it to a file, using the configured error_format.

ATTRIBUTES

error_format

error_format(name)

Change the --error-format flag from the command line with --@rules_rust//:error_format. See rustc documentation for valid values.

ATTRIBUTES

extra_rustc_flag

extra_rustc_flag(name)

Add additional rustc_flag from the command line with --@rules_rust//:extra_rustc_flag. Multiple uses are accumulated and appended after the extra_rustc_flags.

ATTRIBUTES

extra_rustc_flags

extra_rustc_flags(name)

Add additional rustc_flags from the command line with --@rules_rust//:extra_rustc_flags. This flag should only be used for flags that need to be applied across the entire build. For options that apply to individual crates, use the rustc_flags attribute on the individual crate's rule instead. NOTE: These flags not applied to the exec configuration (proc-macros, cargo_build_script, etc); use --@rules_rust//:extra_exec_rustc_flags to apply flags to the exec configuration.

ATTRIBUTES

rust_binary

rust_binary(name, deps, srcs, data, aliases, alwayslink, binary_name, compile_data, crate_features,
            crate_name, crate_root, crate_type, edition, env, experimental_use_cc_common_link,
            linker_script, malloc, out_binary, platform, proc_macro_deps, rustc_env, rustc_env_files,
            rustc_flags, stamp, version)

Builds a Rust binary crate.

Example:

Suppose you have the following directory structure for a Rust project with a library crate, hello_lib, and a binary crate, hello_world that uses the hello_lib library:

[workspace]/
    WORKSPACE
    hello_lib/
        BUILD
        src/
            lib.rs
    hello_world/
        BUILD
        src/
            main.rs

hello_lib/src/lib.rs:

#![allow(unused)]
fn main() {
pub struct Greeter {
    greeting: String,
}

impl Greeter {
    pub fn new(greeting: &str) -> Greeter {
        Greeter { greeting: greeting.to_string(), }
    }

    pub fn greet(&self, thing: &str) {
        println!("{} {}", &self.greeting, thing);
    }
}
}

hello_lib/BUILD:

package(default_visibility = ["//visibility:public"])

load("@rules_rust//rust:defs.bzl", "rust_library")

rust_library(
    name = "hello_lib",
    srcs = ["src/lib.rs"],
)

hello_world/src/main.rs:

extern crate hello_lib;

fn main() {
    let hello = hello_lib::Greeter::new("Hello");
    hello.greet("world");
}

hello_world/BUILD:

load("@rules_rust//rust:defs.bzl", "rust_binary")

rust_binary(
    name = "hello_world",
    srcs = ["src/main.rs"],
    deps = ["//hello_lib"],
)

Build and run hello_world:

$ bazel run //hello_world
INFO: Found 1 target...
Target //examples/rust/hello_world:hello_world up-to-date:
bazel-bin/examples/rust/hello_world/hello_world
INFO: Elapsed time: 1.308s, Critical Path: 1.22s

INFO: Running command line: bazel-bin/examples/rust/hello_world/hello_world
Hello world

On Windows, a PDB file containing debugging information is available under the key pdb_file in OutputGroupInfo. Similarly on macOS, a dSYM folder is available under the key dsym_folder in OutputGroupInfo.

ATTRIBUTES

rust_library

rust_library(name, deps, srcs, data, aliases, alwayslink, compile_data, crate_features, crate_name,
             crate_root, disable_pipelining, edition, proc_macro_deps, rustc_env, rustc_env_files,
             rustc_flags, stamp, version)

Builds a Rust library crate.

Example:

Suppose you have the following directory structure for a simple Rust library crate:

[workspace]/
    WORKSPACE
    hello_lib/
        BUILD
        src/
            greeter.rs
            lib.rs

hello_lib/src/greeter.rs:

#![allow(unused)]
fn main() {
pub struct Greeter {
    greeting: String,
}

impl Greeter {
    pub fn new(greeting: &str) -> Greeter {
        Greeter { greeting: greeting.to_string(), }
    }

    pub fn greet(&self, thing: &str) {
        println!("{} {}", &self.greeting, thing);
    }
}
}

hello_lib/src/lib.rs:

#![allow(unused)]
fn main() {
pub mod greeter;
}

hello_lib/BUILD:

package(default_visibility = ["//visibility:public"])

load("@rules_rust//rust:defs.bzl", "rust_library")

rust_library(
    name = "hello_lib",
    srcs = [
        "src/greeter.rs",
        "src/lib.rs",
    ],
)

Build the library:

$ bazel build //hello_lib
INFO: Found 1 target...
Target //examples/rust/hello_lib:hello_lib up-to-date:
bazel-bin/examples/rust/hello_lib/libhello_lib.rlib
INFO: Elapsed time: 1.245s, Critical Path: 1.01s

ATTRIBUTES

rust_library_group

rust_library_group(name, deps)

Functions as an alias for a set of dependencies.

Specifically, the following are equivalent:

rust_library_group(
    name = "crate_group",
    deps = [
        ":crate1",
        ":crate2",
    ],
)

rust_library(
    name = "foobar",
    deps = [":crate_group"],
    ...
)

and

rust_library(
    name = "foobar",
    deps = [
        ":crate1",
        ":crate2",
    ],
    ...
)

ATTRIBUTES

rust_proc_macro

rust_proc_macro(name, deps, srcs, data, aliases, alwayslink, compile_data, crate_features,
                crate_name, crate_root, edition, proc_macro_deps, rustc_env, rustc_env_files,
                rustc_flags, stamp, version)

Builds a Rust proc-macro crate.

ATTRIBUTES

rust_shared_library

rust_shared_library(name, deps, srcs, data, aliases, alwayslink, compile_data, crate_features,
                    crate_name, crate_root, edition, experimental_use_cc_common_link, malloc,
                    platform, proc_macro_deps, rustc_env, rustc_env_files, rustc_flags, stamp,
                    version)

Builds a Rust shared library.

This shared library will contain all transitively reachable crates and native objects. It is meant to be used when producing an artifact that is then consumed by some other build system (for example to produce a shared library that Python program links against).

This rule provides CcInfo, so it can be used everywhere Bazel expects rules_cc.

When building the whole binary in Bazel, use rust_library instead.

ATTRIBUTES

rust_static_library

rust_static_library(name, deps, srcs, data, aliases, alwayslink, compile_data, crate_features,
                    crate_name, crate_root, edition, platform, proc_macro_deps, rustc_env,
                    rustc_env_files, rustc_flags, stamp, version)

Builds a Rust static library.

This static library will contain all transitively reachable crates and native objects. It is meant to be used when producing an artifact that is then consumed by some other build system (for example to produce an archive that Python program links against).

This rule provides CcInfo, so it can be used everywhere Bazel expects rules_cc.

When building the whole binary in Bazel, use rust_library instead.

ATTRIBUTES

rust_test

rust_test(name, deps, srcs, data, aliases, alwayslink, compile_data, crate, crate_features,
          crate_name, crate_root, edition, env, env_inherit, experimental_use_cc_common_link, malloc,
          platform, proc_macro_deps, rustc_env, rustc_env_files, rustc_flags, stamp,
          use_libtest_harness, version)

Builds a Rust test crate.

Examples:

Suppose you have the following directory structure for a Rust library crate with unit test code in the library sources:

[workspace]/
    WORKSPACE
    hello_lib/
        BUILD
        src/
            lib.rs

hello_lib/src/lib.rs:

#![allow(unused)]
fn main() {
pub struct Greeter {
    greeting: String,
}

impl Greeter {
    pub fn new(greeting: &str) -> Greeter {
        Greeter { greeting: greeting.to_string(), }
    }

    pub fn greet(&self, thing: &str) -> String {
        format!("{} {}", &self.greeting, thing)
    }
}

#[cfg(test)]
mod test {
    use super::Greeter;

    #[test]
    fn test_greeting() {
        let hello = Greeter::new("Hi");
        assert_eq!("Hi Rust", hello.greet("Rust"));
    }
}
}

To build and run the tests, simply add a rust_test rule with no srcs and only depends on the hello_lib rust_library target via the crate attribute:

hello_lib/BUILD:

load("@rules_rust//rust:defs.bzl", "rust_library", "rust_test")

rust_library(
    name = "hello_lib",
    srcs = ["src/lib.rs"],
)

rust_test(
    name = "hello_lib_test",
    crate = ":hello_lib",
    # You may add other deps that are specific to the test configuration
    deps = ["//some/dev/dep"],
)

Run the test with bazel test //hello_lib:hello_lib_test.

Example: test directory

Integration tests that live in the tests directory, they are essentially built as separate crates. Suppose you have the following directory structure where greeting.rs is an integration test for the hello_lib library crate:

[workspace]/
    WORKSPACE
    hello_lib/
        BUILD
        src/
            lib.rs
        tests/
            greeting.rs

hello_lib/tests/greeting.rs:

#![allow(unused)]
fn main() {
extern crate hello_lib;

use hello_lib;

#[test]
fn test_greeting() {
    let hello = greeter::Greeter::new("Hello");
    assert_eq!("Hello world", hello.greeting("world"));
}
}

To build the greeting.rs integration test, simply add a rust_test target with greeting.rs in srcs and a dependency on the hello_lib target:

hello_lib/BUILD:

load("@rules_rust//rust:defs.bzl", "rust_library", "rust_test")

rust_library(
    name = "hello_lib",
    srcs = ["src/lib.rs"],
)

rust_test(
    name = "greeting_test",
    srcs = ["tests/greeting.rs"],
    deps = [":hello_lib"],
)

Run the test with bazel test //hello_lib:greeting_test.

ATTRIBUTES

rust_test_suite

rust_test_suite(name, srcs, shared_srcs, kwargs)

A rule for creating a test suite for a set of rust_test targets.

This rule can be used for setting up typical rust integration tests. Given the following directory structure:

[crate]/
    BUILD.bazel
    src/
        lib.rs
        main.rs
    tests/
        integrated_test_a.rs
        integrated_test_b.rs
        integrated_test_c.rs
        patterns/
            fibonacci_test.rs
        helpers/
            mod.rs

The rule can be used to generate rust_test targets for each source file under tests and a test_suite which encapsulates all tests.

load("//rust:defs.bzl", "rust_binary", "rust_library", "rust_test_suite")

rust_library(
    name = "math_lib",
    srcs = ["src/lib.rs"],
)

rust_binary(
    name = "math_bin",
    srcs = ["src/main.rs"],
)

rust_test_suite(
    name = "integrated_tests_suite",
    srcs = glob(["tests/**"]),
    shared_srcs=glob(["tests/helpers/**"]),
    deps = [":math_lib"],
)

PARAMETERS