Ninja is a small build system with a focus on speed.
Ninja addresses the need for fast build execution by using a streamlined approach to dependency tracking and task execution. Rather than attempting to be a comprehensive build configuration tool, it focuses on the core problem of converting a build specification into compiled output as quickly as possible. The tool reads build files that describe dependencies and commands, then executes them in an optimal order while parallelizing work where possible.
Ninja suits projects that already have a build configuration system in place and need faster incremental builds. It works well as a backend for higher-level build generators that produce Ninja build files, making it particularly valuable in large codebases where build time is a bottleneck. The tool requires only a single binary for operation, with no installation step necessary, though optional shell completion and editor integration files are available. Developers should choose Ninja when build speed is a priority and they are comfortable with a minimalist tool that does not attempt to handle build configuration generation itself.
The project maintains a disciplined development approach focused on its core mission. The codebase is written in C++ and can be built either through a custom Python generator script or CMake, with unit tests available through GoogleTest integration. Documentation is comprehensive, including a detailed manual available in HTML and PDF formats alongside Doxygen-generated API documentation for developers modifying the tool itself. The project provides precompiled binaries for Linux, Mac, and Windows through its release channel, eliminating the need for users to build from source.
