How do I generate a build.ninja file for my project?

Use CMake with the -G Ninja option or write a custom Python script using Ninja's generator. The README provides examples, such as running './configure.py --bootstrap' for self-building or using CMake to generate the file.

Is Ninja faster than Make?

Yes, Ninja is designed to be faster than Make, especially for incremental builds, due to its minimal overhead and optimized dependency tracking. It prioritizes speed over features, making it ideal for large projects.

Can I use Ninja on Windows without extra dependencies?

Absolutely, Ninja provides native Windows binaries that run without Cygwin or additional tools. You can download them directly from GitHub releases, as mentioned in the README.

How does Ninja handle parallel builds?

Ninja supports parallel builds by default using the -j flag to specify the number of concurrent jobs. This leverages its speed-focused design to accelerate compilation in multi-core environments.

Ninja vs CMake: which one should I use?

Use CMake to generate build configurations and Ninja to execute them. CMake handles cross-platform setup and dependency resolution, while Ninja focuses on fast build execution, as shown in their integration examples.

How to install Ninja on macOS?

Download the binary from GitHub releases or use a package manager like Homebrew with 'brew install ninja'. The README notes that installation isn't strictly required, but binaries are available for convenience.

Does Ninja work with Android or iOS projects?

Yes, Ninja can be integrated with build systems like CMake for NDK projects on Android or Xcode on iOS, but it requires proper configuration through generators, as it doesn't natively support platform-specific toolchains.

Open-Awesome

Ninja

Apache-2.0C++v1.13.2

A small build system focused on speed, designed to compile software quickly.

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13.3k stars1.8k forks0 contributors

What is Ninja?

Ninja is a small, fast build system designed to compile software projects quickly, focusing on speed and minimalism. It addresses the problem of slow build times in large-scale development by optimizing incremental builds and reducing overhead. Unlike traditional build systems, it strips away unnecessary features to prioritize performance.

Target Audience

Developers and teams working on large software projects where build speed is critical, such as those in C++ or cross-platform development environments.

Value Proposition

Developers choose Ninja for its unmatched speed in incremental builds and its minimalist design, which reduces complexity and improves reliability compared to heavier alternatives like Make or CMake.

Overview

a small build system with a focus on speed

Use Cases

Best For

Speeding up incremental builds in large C++ projects
Replacing Make in performance-critical development workflows
Cross-platform software compilation with minimal setup
Integrating with CMake for faster build execution
Reducing build times in continuous integration pipelines
Bootstrapping build systems in resource-constrained environments

Not Ideal For

Projects requiring complex build-time scripting or dynamic dependency resolution without external tools
Teams wanting an all-in-one build system with integrated package management and graphical interfaces
Small-scale projects where the setup overhead of generators doesn't justify incremental speed gains

Pros & Cons

Pros

Blazing Fast Incremental Builds

Ninja is optimized to minimize overhead for rapid incremental compilation, directly addressing slow build times in large-scale development as highlighted in its speed-first design.

Minimalist and Reliable

With a small codebase and simple feature set, it reduces complexity and improves reliability, making it suitable for demanding environments where performance is critical.

Cross-Platform Binaries

Pre-built binaries for Linux, macOS, and Windows are available on GitHub, ensuring broad compatibility without requiring installation, as noted in the README.

Self-Bootstrapping Capability

It can build itself using a Python generator script or CMake, demonstrating its efficiency and versatility in real-world use, as described in the building instructions.

Cons

Dependent on External Generators

Ninja requires tools like CMake or custom Python scripts to generate build.ninja files, adding an extra configuration layer and complexity to the workflow.

Limited Built-in Features

It lacks advanced functionality such as automatic dependency management or complex conditionals, forcing users to rely on generators for such needs.

Sparse Documentation Tooling

Generating the manual requires additional tools like asciidoc and xsltproc, which can be a hassle for users seeking quick access to documentation.

Open Source Alternative To

Ninja is an open-source alternative to the following products:

make

Make (or GNU Make) is a build automation tool that automatically builds executable programs and libraries from source code by reading Makefiles.

CMake (as a build executor)

CMake is a cross-platform build system generator that controls the software compilation process using platform and compiler independent configuration files.

Frequently Asked Questions

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