Colo Pollatschek

Bazel is an open-source build and test tool similar to Make, Maven, and Gradle. It uses a human-readable, high-level build language. Bazel supports projects in multiple languages and builds outputs for multiple platforms. Bazel supports large codebases across multiple repositories, and large numbers of users.

Bazel offers the following advantages:

To build or test a project with Bazel, you typically do the following:

In addition to building, you can also use Bazel to run tests and query the build to trace dependencies in your code.

When running a build or a test, Bazel does the following:

Since all previous build work is cached, Bazel can identify and reuse cached artifacts and only rebuild or retest what's changed. To further enforce correctness, you can set up Bazel to run builds and tests hermetically through sandboxing, minimizing skew and maximizing reproducibility.

The action graph represents the build artifacts, the relationships between them, and the build actions that Bazel will perform. Thanks to this graph, Bazel can track changes to file content as well as changes to actions, such as build or test commands, and know what build work has previously been done. The graph also enables you to easily trace dependencies in your code.

To get started with Bazel, see Getting Started or jump directly to the Bazel tutorials:

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