module(
    name = "hello_cross",
    version = "0.0.0",
)

# https://github.com/bazelbuild/rules_rust/releases
bazel_dep(name = "rules_rust", version = "0.46.0")
local_path_override(
    module_name = "rules_rust",
    path = "../../..",
)

# Rules for cross compilation
bazel_dep(name = "toolchains_musl", version = "0.1.16", dev_dependency = True)

# https://github.com/bazelbuild/platforms/releases
bazel_dep(name = "platforms", version = "0.0.10")

# https://github.com/bazel-contrib/toolchains_llvm
bazel_dep(name = "toolchains_llvm", version = "1.0.0")

# https://github.com/bazelbuild/bazel/blob/master/tools/build_defs/repo/http.bzl
http_archive = use_repo_rule("@bazel_tools//:http.bzl", "http_archive")

# Both, cross compilation and MUSL still need a C/C++ toolchain with sysroot.
_BUILD_FILE_CONTENT = """
filegroup(
  name = "{name}",
  srcs = glob(["*/**"]),
  visibility = ["//visibility:public"],
)
"""

# Download sysroot
# https://commondatastorage.googleapis.com/chrome-linux-sysroot/
http_archive(
    name = "org_chromium_sysroot_linux_x64",
    build_file_content = _BUILD_FILE_CONTENT.format(name = "sysroot"),
    sha256 = "f6b758d880a6df264e2581788741623320d548508f07ffc2ae6a29d0c13d647d",
    urls = ["https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/2e7ada854015a4cc60fc812112d261af44213ed0/debian_bullseye_amd64_sysroot.tar.xz"],
)

http_archive(
    name = "org_chromium_sysroot_linux_aarch64",
    build_file_content = _BUILD_FILE_CONTENT.format(name = "sysroot"),
    sha256 = "902d1a40a5fd8c3764a36c8d377af5945a92e3d264c6252855bda4d7ef81d3df",
    urls = ["https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/41a6c8dec4c4304d6509e30cbaf9218dffb4438e/debian_bullseye_arm64_sysroot.tar.xz"],
)

# LLVM setup
# https://github.com/bazel-contrib/toolchains_llvm/tree/0d302de75f6ace071ac616fb274481eedcc20e5a?tab=readme-ov-file#sysroots
llvm = use_extension("@toolchains_llvm//toolchain/extensions:llvm.bzl", "llvm")

# LLVM Versions and platforms
# https://github.com/bazel-contrib/toolchains_llvm/blob/master/toolchain/internal/llvm_distributions.bzl
LLVM_VERSIONS = {
    "": "16.0.0",
    "darwin-aarch64": "16.0.3",
    "darwin-x86_64": "15.0.7",
}

# Host LLVM toolchain.
llvm.toolchain(
    name = "llvm_toolchain",
    llvm_versions = LLVM_VERSIONS,
)
use_repo(llvm, "llvm_toolchain", "llvm_toolchain_llvm")

# X86 LLVM Toolchain with sysroot.
# https://github.com/bazel-contrib/toolchains_llvm/blob/master/tests/WORKSPACE.bzlmod
llvm.toolchain(
    name = "llvm_toolchain_x86_with_sysroot",
    llvm_versions = LLVM_VERSIONS,
)
llvm.sysroot(
    name = "llvm_toolchain_x86_with_sysroot",
    label = "@org_chromium_sysroot_linux_x64//:sysroot",
    targets = ["linux-x86_64"],
)
use_repo(llvm, "llvm_toolchain_x86_with_sysroot")

#
# ARM (aarch64) LLVM Toolchain with sysroot.
# https://github.com/bazelbuild/rules_rust/blob/main/examples/bzlmod/cross_compile/WORKSPACE.bzlmod
llvm.toolchain(
    name = "llvm_toolchain_aarch64_with_sysroot",
    llvm_versions = LLVM_VERSIONS,
)
llvm.sysroot(
    name = "llvm_toolchain_aarch64_with_sysroot",
    label = "@org_chromium_sysroot_linux_aarch64//:sysroot",
    targets = ["linux-aarch64"],
)
use_repo(llvm, "llvm_toolchain_aarch64_with_sysroot")

# Register all LLVM toolchains
register_toolchains("@llvm_toolchain//:all")

# Rust toolchain
RUST_EDITION = "2021"

RUST_VERSION = "1.79.0"

rust = use_extension("@rules_rust//rust:extensions.bzl", "rust")
rust.toolchain(
    edition = RUST_EDITION,
    extra_target_triples = [
        "aarch64-unknown-linux-gnu",
        "x86_64-unknown-linux-gnu",
    ],
    versions = [RUST_VERSION],
)
use_repo(rust, "rust_toolchains")

register_toolchains("@rust_toolchains//:all")