Buck2
UnclaimedA high-performance, extensible build system designed for large, multi-language monorepos.
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TL;DR - Buck2
- Significantly faster build times compared to its predecessor, especially for large projects.
- Ensures reliable builds through hermetic rules and strict dependency enforcement.
- Highly extensible with all build rules written in Starlark, allowing custom rule definition.
Pricing: Free forever
Best for: Individuals & startups
Pros & Cons
Pros
- Optimized for very large, multi-language monorepos
- Provides highly reliable and reproducible builds
- Allows for rapid iteration and customization of build rules
- Leverages remote execution for increased parallelism and efficiency
- Language-agnostic core binary ensures consistent feature access for all rules
Cons
- Designed for large-scale use cases, potentially complex for smaller projects
- Requires understanding of Starlark for custom rule development
Key Features
Faster build performanceHermetic build rules by defaultExtensible with Starlark-defined rulesRemote execution first architectureMulti-language composabilityDynamic (monadic) graph computation engineSupport for dynamic dependencies and anonymous targetsWritten in Rust for performance and absence of GC pauses
Pricing
Free
Buck2 is completely free to use with no hidden costs.
What is Buck2?
Buck2 is a build system developed by Meta, specifically engineered to handle the complexities of very large monorepos that incorporate multiple programming languages such as C++, Python, Rust, Kotlin, and Swift. It is a complete rewrite of its predecessor, Buck1, aiming to improve speed, reliability, and extensibility while retaining target compatibility. Buck2 addresses the limitations of traditional build systems like Make when dealing with the scale and diversity of modern large-scale software development.
Key aspects of Buck2 include its ability to query build targets, support for remote execution to significantly increase parallelism, and multi-language composability, allowing different language components to interact seamlessly. It integrates with file watching services for efficient change detection and utilizes Starlark, a Python-like language, for defining build targets and advanced manipulations. Written in Rust, Buck2 prioritizes remote execution and features an entirely language-agnostic binary, with all rules defined externally in Starlark, enabling faster iteration and consistent feature availability across all rules.
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Buck2 FAQ
What is the primary advantage of Buck2 being written in Rust?
Buck2's implementation in Rust eliminates garbage collection pauses, contributing to its overall speed and performance, especially in large-scale build environments.
How does Buck2 ensure build reliability?
Buck2 enforces hermetic rules by default, meaning all dependencies must be explicitly declared. Missing dependencies are treated as errors, which ensures that builds are reproducible and consistent.
Can Buck2 handle projects with multiple programming languages?
Yes, Buck2 is designed for multi-language composability, allowing projects with various languages like C++, Python, and Rust to be built together, even when they have interdependencies.
What is Starlark's role in Buck2?
Starlark is a deterministic, Python-like language used in Buck2 to define all build rules. This makes the system highly extensible, allowing users to create and customize their own rules as first-class citizens.
How does Buck2's 'remote execution first' approach benefit users?
By treating local execution as a special case of remote execution, Buck2 can pre-compute elements like directory hashes, optimizing the process for sending actions to remote servers and significantly increasing build parallelism and efficiency.
What is the significance of Buck2's dynamic graph computation engine?
The dynamic graph, also known as a monadic graph, allows rules to build files and then inspect their contents before specifying future dependencies and actions. This enables advanced features like dynamic dependencies and anonymous targets, leading to more efficient sharing of compiled code.
Source: buck2.build