Buck2 is a fast build system that can be installed from prebuilt binaries or built from source using Rust nightly.
Field note
Buck2 is a build system developed by Facebook. This page provides installation instructions: download prebuilt binaries from the latest release, use dotslash for repositories, or build from source with Rust nightly via rustup or Nix. It also covers protoc requirements for non-Tier-1 platforms and bootstrapping with Buck2 itself.
Capabilities
Tags
Ways to use it
Rust / Not filed
Product features
Supports features for Haskell, OCaml, and Rust beyond Buck1, like stub headers and pipelining.
Create graphs with more sharing than the original user graph.
Build Buck2 with Buck2 using reindeer and buckify.
Write BUCK files to define rules.
Use BXL for advanced build operations with a context type.
Rules are hermetic by default, missing dependencies are errors, leading to fewer surprises.
Buck2 is significantly closer to the critical path when there is real work to do, with benchmarks showing 5% to 42% faster.
Runs on Windows, Linux, and macOS, and builds for Android, iOS, and others.
Use queries to explore and understand dependency relationships.
Rules can build a file then read it to determine further dependencies.
Add new language support via custom build rules and toolchains.
Buck2 makes 'buck build' with nothing to do take 0.1 seconds vs 23 seconds in Buck1.
Prebuilt executables available from the latest release page.
Efficiently rebuilds only necessary parts after small changes.
Designed for large monorepos.
Supports mixing languages like Python, Rust, C in a single build.
Build projects in C++, Rust, Python, Go, OCaml, Erlang, and more.
Use flake.nix to get a development shell with cargo and rustc.
Prebuilt protoc on Tier-1 platforms; env vars for others.
Uses Reindeer to automatically generate BUCK files for crates.io dependencies.
Local execution is a special case of remote execution.
Define rules using Starlark standard functions and build functions like rule and attrs.
Install via cargo with nightly Rust toolchain.
Buck2 can be built with Cargo or itself, using DotSlash files for quick self-bootstrap.
With Buck2, everyone writes to the cache through sandboxed remote execution, increasing cache hits.
Provides standard rules available in Buck2.
Buck2 is driven by Starlark APIs, a subset of Python.
Build defined as queryable targets in BUCK files.