Bazel vs GN
Bazel
bazel.build
GN
gn.googlesource.comSide by side
| Figure | Bazel | GN |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| Plans published | 1 | 1 |
| Spec score · Build Automation Software | 8.8 (#3) | 7.9 (#15) |
| Languages | Bazel supports languages including C++, Java, Kotlin, Python, Go, and Rust. | GN generates Ninja files for C, C++, Rust, Objective C, and Swift; other languages can use script-based action rules. |
| Purpose | Bazel is an open-source tool that automates software builds and tests. | GN is a meta-build system that generates build files for Ninja. |
| Scale | The documentation says Bazel can handle builds with 100,000 or more source files and work across multiple repositories. | It is designed to scale to thousands of build files and tens of thousands of source files. |
| Support | The project directs users to its discussion group, GitHub issue tracker, Slack, and Stack Overflow. | Users can report bugs in the GN bug database and ask questions or follow development on the Chromium GN developers Google Group. |
Plans
In their own words
Bazel
Bazel is a free, open-source tool for automating software builds and tests across languages and platforms. Projects define targets in BUILD files using Starlark, which can also be used to create custom rules and macros. Bazel caches prior work and rebuilds what needs to change, while running tasks in parallel. It supports languages including C++, Java, Kotlin, Python, Go, and Rust, with outputs for desktop, server, Android, and iOS. Bazel runs on Linux, macOS, and Windows, and the documentation describes builds with 100,000 or more source files across multiple repositories. Sandboxing can make builds and tests more hermetic, and failures return a non-zero exit code for basic CI integration. Teams can share outputs through a remote cache, but must select and maintain its backend and secure access because it can contain binaries. IDE options include plugins for IntelliJ, Android Studio, CLion, and Visual Studio Code, plus Xcode integration. Bazel is not well suited to uncached deployment steps that change cloud configuration.