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Add example of cross-compiling with musl (#2535)
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‎.bazelci/presubmit.yml

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# working_directory: examples/zig_cross_compiling
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# build_targets:
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# - "//..."
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musl_cross_compiling_macos_to_linux:
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name: Musl cross compiling test from macOS to Linux
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platform: macos
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working_directory: examples/musl_cross_compiling
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build_targets:
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- "//..."
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test_targets:
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- "//..."
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nix_cross_compiling:
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name: Nix cross compiling test
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platform: ubuntu2204

‎examples/.bazelignore

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crate_universe_unnamed
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ios
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ios_build
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musl_cross_compiling
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nix_cross_compiling
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zig_cross_compiling

‎examples/musl_cross_compiling/.gitignore

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/bazel-*

‎examples/musl_cross_compiling/BUILD.bazel

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load("@aspect_bazel_lib//lib:transitions.bzl", "platform_transition_binary")
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load("@rules_rust//rust:defs.bzl", "rust_binary")
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rust_binary(
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name = "hello",
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srcs = ["src/main.rs"],
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tags = ["manual"],
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)
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platform_transition_binary(
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name = "hello_linux_x86_64_musl",
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binary = ":hello",
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target_platform = "//platforms:linux_x86_64_musl",
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)
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sh_test(
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name = "hello_linux_x86_64_musl_test",
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srcs = ["hello_linux_musl_test.sh"],
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args = [
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"$(rootpath :hello_linux_x86_64_musl)",
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"'ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), static-pie linked'",
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],
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data = [":hello_linux_x86_64_musl"],
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)
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platform_transition_binary(
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name = "hello_linux_arm64_musl",
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binary = ":hello",
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target_platform = "//platforms:linux_arm64_musl",
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)
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sh_test(
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name = "hello_linux_arm64_musl_test",
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srcs = ["hello_linux_musl_test.sh"],
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args = [
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"$(rootpath :hello_linux_arm64_musl)",
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"'ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), statically linked'",
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],
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data = [":hello_linux_arm64_musl"],
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)

‎examples/musl_cross_compiling/WORKSPACE.bazel

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local_repository(
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name = "rules_rust",
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path = "../..",
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)
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load("@rules_rust//rust:repositories.bzl", "rules_rust_dependencies", "rust_register_toolchains", "rust_repository_set")
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rules_rust_dependencies()
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EDITION = "2021"
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RUST_VERSION = "1.76.0"
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rust_register_toolchains(
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edition = EDITION,
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)
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rust_repository_set(
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name = "darwin_x86_64_to_x86_64_musl_tuple",
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edition = EDITION,
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exec_triple = "x86_64-apple-darwin",
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# Setting this extra_target_triples allows differentiating the musl case from the non-musl case, in case multiple linux-targeting toolchains are registered.
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extra_target_triples = {"x86_64-unknown-linux-musl": [
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"@//linker_config:musl",
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"@platforms//cpu:x86_64",
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"@platforms//os:linux",
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]},
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versions = [RUST_VERSION],
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)
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rust_repository_set(
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name = "darwin_arm64_to_x86_64_musl_tuple",
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edition = EDITION,
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exec_triple = "aarch64-apple-darwin",
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extra_target_triples = {"x86_64-unknown-linux-musl": [
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"@//linker_config:musl",
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"@platforms//cpu:x86_64",
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"@platforms//os:linux",
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]},
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versions = [RUST_VERSION],
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)
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rust_repository_set(
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name = "darwin_x86_64_to_arm64_musl_tuple",
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edition = EDITION,
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exec_triple = "x86_64-apple-darwin",
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# Setting this extra_target_triples allows differentiating the musl case from the non-musl case, in case multiple linux-targeting toolchains are registered.
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extra_target_triples = {"aarch64-unknown-linux-musl": [
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"@//linker_config:musl",
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"@platforms//cpu:arm64",
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"@platforms//os:linux",
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]},
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versions = [RUST_VERSION],
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)
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rust_repository_set(
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name = "darwin_arm64_to_arm64_musl_tuple",
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edition = EDITION,
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exec_triple = "aarch64-apple-darwin",
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extra_target_triples = {"aarch64-unknown-linux-musl": [
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"@//linker_config:musl",
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"@platforms//cpu:arm64",
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"@platforms//os:linux",
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]},
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versions = [RUST_VERSION],
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)
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load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
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http_archive(
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name = "aspect_bazel_lib",
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sha256 = "f5ea76682b209cc0bd90d0f5a3b26d2f7a6a2885f0c5f615e72913f4805dbb0d",
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strip_prefix = "bazel-lib-2.5.0",
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url = "https://github.com/aspect-build/bazel-lib/releases/download/v2.5.0/bazel-lib-v2.5.0.tar.gz",
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)
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load("@aspect_bazel_lib//lib:repositories.bzl", "aspect_bazel_lib_dependencies", "aspect_bazel_lib_register_toolchains")
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aspect_bazel_lib_dependencies()
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aspect_bazel_lib_register_toolchains()
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http_archive(
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name = "musl_toolchains",
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sha256 = "f9f077b9ae74a0545f7cb7108462cb061593eef10fd09d25db4554e281ee880b",
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url = "https://github.com/bazel-contrib/musl-toolchain/releases/download/v0.1.7/musl_toolchain-v0.1.7.tar.gz",
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)
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load("@musl_toolchains//:repositories.bzl", "load_musl_toolchains")
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# Setting this extra_target_triples allows differentiating the musl case from the non-musl case, in case multiple linux-targeting toolchains are registered.
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load_musl_toolchains(extra_target_compatible_with = ["@//linker_config:musl"])
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load("@musl_toolchains//:toolchains.bzl", "register_musl_toolchains")
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register_musl_toolchains()

‎examples/musl_cross_compiling/hello_linux_musl_test.sh

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#!/bin/bash
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set -euo pipefail
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if [[ $# -ne 2 ]]; then
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echo >&2 "Usage: $0 /path/to/binary file-output"
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exit 1
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fi
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binary="$1"
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want_file_output="$2"
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out="$(file "${binary}")"
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if [[ "${out}" != *"${want_file_output}"* ]]; then
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echo >&2 "Wrong file type: ${out}"
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exit 1
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fi

‎examples/musl_cross_compiling/linker_config/BUILD.bazel

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constraint_setting(
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name = "linker",
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default_constraint_value = ":unknown",
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visibility = ["//visibility:public"],
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)
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constraint_value(
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name = "musl",
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constraint_setting = ":linker",
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visibility = ["//visibility:public"],
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)
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# Default linker for anyone not setting the linker to `musl`.
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# You shouldn't ever need to set this value manually.
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constraint_value(
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name = "unknown",
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constraint_setting = ":linker",
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visibility = ["//visibility:public"],
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)

‎examples/musl_cross_compiling/platforms/BUILD.bazel

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platform(
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name = "linux_x86_64_musl",
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constraint_values = [
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"@//linker_config:musl",
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"@platforms//cpu:x86_64",
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"@platforms//os:linux",
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],
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visibility = ["//visibility:public"],
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)
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platform(
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name = "linux_arm64_musl",
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constraint_values = [
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"@//linker_config:musl",
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"@platforms//cpu:arm64",
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"@platforms//os:linux",
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],
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visibility = ["//visibility:public"],
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)

‎examples/musl_cross_compiling/src/main.rs

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fn main() {
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println!("Yo");
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}

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