swiftlang/swift-llbuild

Health v2 · maintenance only

Adoption not part of the score

1277 stars · 236 forks observed · 2026-09-03

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

llbuild is a low-level, library-based build system designed as a reusable and scalable build engine capable of handling dependency graphs with millions of nodes. It powers Swift Package Manager and Xcode and includes a CLI that can build Ninja manifests as a Ninja-compatible replacement.

Use cases

• build swift packages with a custom build engine
• replace ninja with a compatible build tool
• embed a build engine in a bespoke build system
• build large projects like llvm and clang from ninja manifests
• profile build performance with chromium trace files
• construct a custom build system on a scalable engine

When to choose

• you need an embeddable, library-based build engine rather than a fixed build file syntax
• you work on Swift tooling or Swift Package Manager internals
• you want a Ninja-compatible builder with build tracing support
• you need to scale builds to very large dependency graphs

When to avoid

• you just want a simple, conventional build system with a friendly syntax like CMake or Bazel
• you need full Ninja feature compatibility rather than a subset
• you are not building in the Swift/Apple toolchain ecosystem and have no need for a custom engine

Facets

library · maturity active

build-tool parser cli developer-tools developer-tools compilers programming-languages cpp cross-platform build-engine ninja swift-package-manager xcode dependency-graph embeddable command-line macos linux swift

Member repositories

For agents

markdown · JSON · MCP: product_card(name="swiftlang/swift-llbuild")