---
nav: docs
---

<!DOCTYPE html>
<html lang="en" itemscope itemtype="https://schema.org/WebPage">
  {% include head.html %}
  <body>
    {% include header.html %}

    <div class="page-title-bar">
      <div class="container">
        <h1>Documentation</h1>
      </div>
    </div>

    <div class="container vpad">
      <div class="row">
        <div class="col-md-3">
          <a class="btn btn-default btn-lg btn-block sidebar-toggle"
              data-toggle="collapse" href="#sidebar-nav" aria-expanded="false"
              aria-controls="sidebar-nav">
            <i class="glyphicon glyphicon-menu-hamburger"></i> Navigation
          </a>
          <nav class="sidebar collapse" id="sidebar-nav">
           <h3>Home</h3>
            <ul class="sidebar-nav">
              <li><a href="/versions/{{ site.version }}/bazel-overview.html">Bazel Overview</a></li>
              <li><a href="/versions/{{ site.version }}/experimental.html">Experimental Features</a></li>
            </ul>

            <h3>Installing Bazel</h3>
           <ul class="sidebar-nav">
              <li><a href="/versions/{{ site.version }}/install.html">Installation Overview</a></li>
              <li><a href="/versions/{{ site.version }}/install-ubuntu.html">Installing on Ubuntu</a></li>
              <li><a href="/versions/{{ site.version }}/install-redhat.html">Installing on Fedora/CentOS</a></li>
              <li><a href="/versions/{{ site.version }}/install-os-x.html">Installing on macOS</a></li>
              <li><a href="/versions/{{ site.version }}/install-windows.html">Installing on Windows</a></li>
              <li><a href="/versions/{{ site.version }}/install-compile-source.html">Compiling from Source</a></li>
              <li><a href="/versions/{{ site.version }}/ide.html">Integrating with IDEs</a></li>
            </ul>

          <h3>Tutorials</h3>
           <ul class="sidebar-nav">
              <li><a href="/versions/{{ site.version }}/tutorial/java.html">Building a Java Project</a></li>
              <li><a href="/versions/{{ site.version }}/tutorial/cpp.html">Building a C++ Project</a></li>
              <li><a href="/versions/{{ site.version }}/tutorial/android-app.html">Building an Android App</a></li>
              <li><a href="/versions/{{ site.version }}/tutorial/ios-app.html">Building an iOS App</a></li>
              <li><a href="/versions/{{ site.version }}/skylark/tutorial-sharing-variables.html">Sharing Variables</a></li>
              <li><a href="/versions/{{ site.version }}/skylark/tutorial-creating-a-macro.html">Creating Macros</a></li>
            </ul>

           <h3>Using Bazel</h3>
            <ul class="sidebar-nav">
              <li><a href="/versions/{{ site.version }}/getting-started.html">Getting Started</a></li>
              <li><a href="/versions/{{ site.version }}/user-manual.html">User Manual</a></li>

              <li>
                <a class="sidebar-nav-heading" data-toggle="collapse"
                    href="#cpp-menu" aria-expanded="false"
                    aria-controls="cpp-menu">
                  Bazel and C++<span class="caret"></span>
                </a>
                <ul class="collapse sidebar-nav sidebar-submenu" id="cpp-menu">
                  <li><a href="/versions/{{ site.version }}/bazel-and-cpp.html">C++ Resources</a></li>
                  <li><a href="/versions/{{ site.version }}/cpp-use-cases.html">C++ Use Cases</a></li>
                </ul>
              </li>

              <li>
                <a class="sidebar-nav-heading" data-toggle="collapse"
                    href="#java-menu" aria-expanded="false"
                    aria-controls="java-menu">
                  Bazel and Java<span class="caret"></span>
                </a>
                <ul class="collapse sidebar-nav sidebar-submenu" id="java-menu">
                  <li><a href="/versions/{{ site.version }}/bazel-and-java.html">Java Resources</a></li>
                  <li><a href="/versions/{{ site.version }}/migrate-maven.html">Migrating from Maven</a></li>
                  <li><a href="/versions/{{ site.version }}/generate-workspace.html">Converting Maven Dependencies</a></li>
                </ul>
              </li>

              <li>
                <a class="sidebar-nav-heading" data-toggle="collapse"
                    href="#android-menu" aria-expanded="false"
                    aria-controls="android-menu">
                  Bazel and Android<span class="caret"></span>
                </a>
                <ul class="collapse sidebar-nav sidebar-submenu" id="android-menu">
                  <li><a href="/versions/{{ site.version }}/bazel-and-android.html">Android Resources</a></li>
                  <li><a href="/versions/{{ site.version }}/mobile-install.html">Using mobile-install</a></li>
                </ul>
              </li>

               <li>
                <a class="sidebar-nav-heading" data-toggle="collapse"
                    href="#apple-menu" aria-expanded="false"
                    aria-controls="apple-menu">
                  Bazel and Apple<span class="caret"></span>
                </a>
                <ul class="collapse sidebar-nav sidebar-submenu" id="apple-menu">
                  <li><a href="/versions/{{ site.version }}/bazel-and-apple.html">Apple Resources</a></li>
                  <li><a href="/versions/{{ site.version }}/migrate-xcode.html">Migrating from Xcode</a></li>
                  <li><a href="/versions/{{ site.version }}/migrate-cocoapods.html">Converting CocoaPods</a></li>
                </ul>
              </li>
              <li><a href="/versions/{{ site.version }}/windows.html">Using Bazel on Windows</a></li>
              <li><a href="/versions/{{ site.version }}/external.html">Adding External Dependencies</a></li>
              <li><a href="/versions/{{ site.version }}/query-how-to.html">Querying Builds</a></li>
              <li><a href="/versions/{{ site.version }}/test-encyclopedia.html">Writing Tests</a></li>
              <li><a href="/versions/{{ site.version }}/best-practices.html">Best Practices</a></li>
             </ul>

          <h3>Reference</h3>
           <ul class="sidebar-nav">
             <li><a href="/versions/{{ site.version }}/build-ref.html">Bazel Concepts</a></li>

             <li><a class="sidebar-nav-heading" data-toggle="collapse"
                    href="#be-menu" aria-expanded="false"
                    aria-controls="be-menu">
                  Build Encyclopedia<span class="caret"></span>
                </a>
             <ul class="collapse sidebar-nav sidebar-submenu" id="be-menu">
                  <li><a href="/versions/{{ site.version }}/be/overview.html">Build Overview</a></li>
                  <li><a href="/versions/{{ site.version }}/be/common-definitions.html">Build Concepts</a></li>
                  <li><a href="/versions/{{ site.version }}/be/make-variables.html">Make Variables</a></li>
                  <li><a href="/versions/{{ site.version }}/be/functions.html">Functions</a></li>

                  <li><a class="sidebar-nav-heading" data-toggle="collapse"
                    href="#be-rules-menu" aria-expanded="false"
                    aria-controls="be-rules-menu">
                  Rules<span class="caret"></span>
                      </a>
                    <ul class="collapse sidebar-nav sidebar-submenu" id="be-rules-menu">
                       <li><a href="/versions/{{ site.version }}/be/general.html">General</a></li>
                       <li><a href="/versions/{{ site.version }}/be/workspace.html">Workspace</a></li>
                       <li><a href="/versions/{{ site.version }}/be/platform.html">Platform</a></li>
                       <li><a href="/versions/{{ site.version }}/be/pkg.html">Packaging</a></li>
                       <li><a href="/versions/{{ site.version }}/be/extra-actions.html">Extra Actions</a></li>
                       <li><a href="/versions/{{ site.version }}/be/android.html">Android</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_appengine">AppEngine</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_apple">Apple</a></li>
                       <li><a href="/versions/{{ site.version }}/be/c-cpp.html">C and C++</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_dotnet">C#</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_d">D</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_docker">Docker</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_go">Go</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_groovy">Groovy</a></li>
                       <li><a href="/versions/{{ site.version }}/be/java.html">Java</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_closure">JavaScript (Closure)</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_jsonnet">Jsonnet</a></li>
                       <li><a href="/versions/{{ site.version }}/be/objective-c.html">Objective C</a></li>
                       <li><a href="/versions/{{ site.version }}/be/protocol-buffer.html">Protocol Buffers</a></li>
                       <li><a href="/versions/{{ site.version }}/be/python.html">Python</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_rust">Rust</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_sass">Sass</a></li>
                       <li><a href="https://github.com/bazelbuild/rules_scala">Scala</a></li>
                       <li><a href="/versions/{{ site.version }}/be/shell.html">Shell</a></li>
                    </ul></li>
               </ul></li>

             <li><a href="/versions/{{ site.version }}/skylark/build-style.html">BUILD File Reference</a></li>
             <li><a href="/versions/{{ site.version }}/command-line-reference.html">Command Line Reference</a></li>
             <li><a href="/versions/{{ site.version }}/build-event-protocol.html">Build Event Protocol</a></li>
             <li><a href="/versions/{{ site.version }}/query.html">Bazel Query Language</a></li>
             <li><a href="/versions/{{ site.version }}/output_directories.html">Output Directory Layout</a></li>
             <li><a href="/versions/{{ site.version }}/platforms.html">Platforms</a></li>
             <li><a href="/versions/{{ site.version }}/toolchains.html">Toolchains</a></li>
           </ul>

            <h3>Extending Bazel</h3>
           <ul class="sidebar-nav">
              <li><a href="/versions/{{ site.version }}/skylark/concepts.html">Overview</a></li>

              <li>
                <a class="sidebar-nav-heading" data-toggle="collapse"
                    href="#skylark-concepts" aria-expanded="false"
                    aria-controls="skylark-concepts">
                  Concepts<span class="caret"></span>
                </a>
                <ul class="collapse sidebar-nav sidebar-submenu" id="skylark-concepts">
                  <li><a href="/versions/{{ site.version }}/skylark/macros.html">Macros</a></li>
                  <li><a href="/versions/{{ site.version }}/skylark/rules.html">Rules</a></li>
                  <li><a href="/versions/{{ site.version }}/skylark/depsets.html">Depsets</a></li>
                  <li><a href="/versions/{{ site.version }}/skylark/aspects.html">Aspects</a></li>
                  <li><a href="/versions/{{ site.version }}/skylark/repository_rules.html">Repository Rules</a></li>
                </ul>
              </li>

              <li>
                <a class="sidebar-nav-heading" data-toggle="collapse"
                    href="#skylark-practices" aria-expanded="false"
                    aria-controls="skylark-practices">
                  Best Practices<span class="caret"></span>
                </a>
                <ul class="collapse sidebar-nav sidebar-submenu" id="skylark-practices">
                  <li><a href="/versions/{{ site.version }}/skylark/bzl-style.html">Readability Guidelines</a></li>
                  <li><a href="/versions/{{ site.version }}/skylark/backward-compatibility.html">Backward Compatibility</a></li>
                  <li><a href="https://skydoc.bazel.build" target="_blank">Documenting Rules</a></li>
                  <li><a href="/versions/{{ site.version }}/skylark/skylint.html">Linter</a></li>
                  <li><a href="/versions/{{ site.version }}/skylark/performance.html">Optimizing Performance</a></li>
                  <li><a href="/versions/{{ site.version }}/skylark/deploying.html">Deploying Rules</a></li>
                </ul>
              </li>

              <li><a href="https://github.com/bazelbuild/examples/tree/master/rules">Examples</a></li>
              <li><a href="/versions/{{ site.version }}/skylark/lib/skylark-overview.html">API Reference</a></li>
              <li><a href="/versions/{{ site.version }}/skylark/language.html">Skylark Language Reference</a></li>
            </ul>
          </nav>
        </div>

        <div class="col-md-9">
          <a id="gh-edit" class="gh-edit default-hidden"><i class="fa fa-pencil" aria-hidden="true"></i> Edit</a>
          <script>
            var versionDocsURLRegex = /\/versions\/[\w\.]+\/(.*)/;
            var ghDocsBazeURL = 'https://github.com/bazelbuild/bazel/tree/master/site/docs/';
            var editButton = document.getElementById('gh-edit');
            // if there is an edit button and we are not in the Build Encyclopedia
            if (editButton
                && window.location.pathname.match(versionDocsURLRegex)
                && window.location.pathname.lastIndexOf('/be/') == -1
                && window.location.pathname.lastIndexOf('/skylark/lib/') == -1) {
              var docFile = window.location.pathname.match(versionDocsURLRegex)[1];
              // some pages are not using markdown :(
              if (docFile !== 'bazel-user-manual.html'
                  && docFile !== 'build-ref.html'
                  && docFile !== 'query.html'
                  && docFile !== 'test-encyclopedia.html') {
                docFile = docFile.replace('html', 'md');
              }
              editButton.href = ghDocsBazeURL + docFile;
              editButton.style.visibility = 'visible';
            }
          </script>

          {{ content }}
        </div>
      </div>
    </div>

    <!-- Satisfaction Survey -->
    <script async="" defer="" src="//survey.g.doubleclick.net/async_survey?site=oohdpic4fyfp3jcnym6aqkdf3e"></script>

    {% include footer.html %}
  </body>
</html>