buildbuddy-clang

Minified Clang toolchain distribution

About

This repository contains Github Actions to build and package the clang C toolchains for consumption with Bazel and optimized for buildbuddy CI.

C (Clang)

We build a Clang toolchain from the upstream source llvm-project with CMake and Ninja. Generally following the instructions from:

• Clang - Getting Started
• Building LLVM with CMake
• Assembling a Complete Toolchain

The resulting toolchain is designed for consumption with toolchains_llvm and to be a drop-in replacement for the toolchains provided by the upstream llvm-project. Similar to Rust, we also compress the package with zstd.

Setup (Bazelmod)

Just add the following to your MODULE.bazel file.

bazel_dep(name = "toolchains_llvm", version = "1.2.0", dev_dependency = True)

LLVM_VERSIONS = {
    "": "19.1.6",
}

llvm = use_extension("@toolchains_llvm//toolchain/extensions:llvm.bzl", "llvm")
llvm.toolchain(
    name = "llvm_toolchain",
    llvm_versions = LLVM_VERSIONS,
    sha256 = {
        "linux-x86_64": "a23d498699b22944be3a5a0470c0cfb229f801bbc1e460432617f8d08d0d57ea",
        "linux-aarch64": "",
    },
    stdlib = {
        "linux-x86_64": "stdc++",
        "linux-aarch64": "stdc++",
    },
    urls = {
        "linux-x86_64": ["https://github.com/marvin-hansen/buildbuddy-clang/releases/download/clang-19.1.6-x86-64/linux_x86_64.tar.zst"],
        "linux-aarch64": ["https://github.com/marvin-hansen/buildbuddy-clang/releases/download/clang-19.1.6-arm64/linux_aarch64.tar.zst"],
    },
)
use_repo(llvm, "llvm_toolchain", "llvm_toolchain_llvm")

register_toolchains("@llvm_toolchain//:all")

Sysroot

We also build a sysroot for the toolchain for intel and Arm.

Acknowledgements

This repo started out as a fork from https://github.com/MaterializeInc/toolchains

Special thanks to @ParkMyCar for open sourcing and maintaining the said repo.

Also, special thanks to @scasagrande for his work on sysroot building for llvm toolchain.

License

Apache-2.0, as the original repo.