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Why Bazel?
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href="https://github.com/bazelbuild/bazel/issues/new?title=%5Bbazel.build%5D+Problem+with+/about/why&template=doc_issue.yml&link=https%3A%2F%2Fbazel.build/about/why" target="_blank"> Report an issue<span class="material-icons icon-after" aria-hidden="true" translate="no">open_in_new</span> </a> <a class="button button-with-icon" href="https://github.com/bazelbuild/bazel/tree/master/site/en/about/why.md" target="_blank"> View source<span class="material-icons icon-after" aria-hidden="true" translate="no">open_in_new</span> </a> <span style="float: right; line-height: 36px"> <strong>Nightly</strong> <!-- The lines below are updated by //scripts/docs:gen_new_toc --> <!-- BEGIN_VERSION_INDICATOR --> · <a href="/versions/8.1.0/about/why">8.1</a> · <a href="/versions/8.0.0/about/why">8.0</a> · <a href="/versions/7.6.0/about/why">7.6</a> · <a href="/versions/7.5.0/about/why">7.5</a> · <a href="/versions/7.4.0/about/why">7.4</a> <!-- END_VERSION_INDICATOR --> </span> <p/> <p>Bazel is a <a href="#fast">fast</a>, <a href="#correct">correct</a>, and <a href="#extensible">extensible</a> build tool with <a href="#integrated-testing">integrated testing</a> that supports multiple <a href="#multi-language">languages</a>, <a href="#multi-repository">repositories</a>, and <a href="#multi-platform">platforms</a> in an industry-leading <a href="#ecosystem">ecosystem</a>.</p> <h2 id="fast" data-text="Bazel is fast" tabindex="-1">Bazel is fast</h2> <p>Bazel knows exactly what input files each build command needs, avoiding unnecessary work by re-running only when the set of input files have changed between each build. It runs build commands with as much parallelism as possible, either within the same computer or on <a href="/remote/rbe">remote build nodes</a>. If the structure of build allows for it, it can run thousands of build or test commands at the same time.</p> <p>This is supported by multiple caching layers, in memory, on disk and on the remote build farm, if available. At Google, we routinely achieve cache hit rates north of 99%.</p> <h2 id="correct" data-text="Bazel is correct" tabindex="-1">Bazel is correct</h2> <p>Bazel ensures that your binaries are built <em>only</em> from your own source code. Bazel actions run in individual sandboxes and Bazel tracks every input file of the build, only and always re-running build commands when it needs to. This keeps your binaries up-to-date so that the <a href="/basics/hermeticity">same source code always results in the same binary</a>, bit by bit.</p> <p>Say goodbyte to endless <code translate="no" dir="ltr">make clean</code> invocations and to chasing phantom bugs that were in fact resolved in source code that never got built.</p> <h2 id="extensible" data-text="Bazel is extensible" tabindex="-1">Bazel is extensible</h2> <p>Harness the full power of Bazel by writing your own rules and macros to customize Bazel for your specific needs across a wide range of projects.</p> <p>Bazel rules are written in <a href="/rules/language">Starlark</a>, our in-house programming language that's a subset of Python. Starlark makes rule-writing accessible to most developers, while also creating rules that can be used across the ecosystem.</p> <h2 id="integrated-testing" data-text="Integrated testing" tabindex="-1">Integrated testing</h2> <p>Bazel's <a href="/docs/user-manual#running-tests">integrated test runner</a> knows and runs only those tests needing to be re-run, using remote execution (if available) to run them in parallel. Detect flakes early by using remote execution to quickly run a test thousands of times.</p> <p>Bazel <a href="/remote/bep">provides facilities</a> to upload test results to a central location, thereby facilitating efficient communication of test outcomes, be it on CI or by individual developers.</p> <h2 id="multi-language" data-text="Multi-language support" tabindex="-1">Multi-language support</h2> <p>Bazel supports many common programming languages including C++, Java, Kotlin, Python, Go, and Rust. You can build multiple binaries (for example, backend, web UI and mobile app) in the same Bazel invocation without being constrained to one language's idiomatic build tool.</p> <h2 id="multi-repository" data-text="Multi-repository support" tabindex="-1">Multi-repository support</h2> <p>Bazel can <a href="/external/overview">gather source code from multiple locations</a>: you don't need to vendor your dependencies (but you can!), you can instead point Bazel to the location of your source code or prebuilt artifacts (e.g. a git repository or Maven Central), and it takes care of the rest.</p> <h2 id="multi-platform" data-text="Multi-platform support" tabindex="-1">Multi-platform support</h2> <p>Bazel can simultaneously build projects for multiple platforms including Linux, macOS, Windows, and Android. It also provides powerful <a href="/extending/platforms">cross-compilation capabilities</a> to build code for one platform while running the build on another.</p> <h2 id="ecosystem" data-text="Wide ecosystem" tabindex="-1">Wide ecosystem</h2> <p><a href="/community/users">Industry leaders</a> love Bazel, building a large community of developers who use and contribute to Bazel. Find a tools, services and documentation, including <a href="/community/experts">consulting and SaaS offerings</a> Bazel can use. 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