Buck2
A fast, hermetic, multi-language build system designed for large-scale projects and distributed compilation.
What is Buck2?
Buck2 is a modern, open-source build system developed by Meta as the direct successor to Buck1. It is designed for speed, hermetic builds, and multi-language support, enabling efficient management of complex projects with diverse technology stacks like Python, OCaml, and Rust. The system emphasizes correctness, scalability, and flexibility to eliminate build inconsistencies and optimize performance.
Developers and engineering teams working on large-scale, multi-language projects who need a unified build tool for languages such as Python, OCaml, and Rust. It is particularly suited for organizations with ultra-large repositories or those requiring distributed compilation and hermetic builds for consistency.
Developers choose Buck2 for its significant performance improvements—reportedly up to 2x faster than Buck1—and its enforced hermetic builds that prevent 'it works on my machine' issues. Its language-agnostic core and scriptable extensions via Buck Extension Language (BXL) offer unparalleled flexibility for custom language support and automation, distinguishing it from alternatives like Bazel or Pants.
Overview
Build system, successor to Buck
Use Cases
Best For
Related Projects
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