<!DOCTYPE HTML> <html lang="en" class="sidebar-visible no-js"> <head> <!-- Book generated using mdBook --> <meta charset="UTF-8"> <title>rustc - The Cargo Book</title> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> <meta name="description" content=""> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="theme-color" content="#ffffff" /> <base href="../"> <link rel="stylesheet" href="book.css"> <link href="https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet" type="text/css"> <link href="https://fonts.googleapis.com/css?family=Source+Code+Pro:500" rel="stylesheet" type="text/css"> <link rel="shortcut icon" href="favicon.png"> <!-- Font Awesome --> <link rel="stylesheet" href="_FontAwesome/css/font-awesome.css"> <link rel="stylesheet" href="highlight.css"> <link rel="stylesheet" href="tomorrow-night.css"> <link rel="stylesheet" href="ayu-highlight.css"> <!-- Custom theme stylesheets --> </head> <body class="light"> <!-- Work around some values being stored in localStorage wrapped in quotes --> <script type="text/javascript"> try { var theme = localStorage.getItem('mdbook-theme'); var sidebar = localStorage.getItem('mdbook-sidebar'); if (theme.startsWith('"') && theme.endsWith('"')) { localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1)); } if (sidebar.startsWith('"') && sidebar.endsWith('"')) { localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1)); } } catch (e) { } </script> <!-- Set the theme before any content is loaded, prevents flash --> <script type="text/javascript"> var theme; try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { } if (theme === null || theme === undefined) { theme = 'light'; } document.body.className = theme; document.querySelector('html').className = theme + ' js'; </script> <!-- Hide / unhide sidebar before it is displayed --> <script type="text/javascript"> var html = document.querySelector('html'); var sidebar = 'hidden'; if (document.body.clientWidth >= 1080) { try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { } sidebar = sidebar || 'visible'; } html.classList.remove('sidebar-visible'); html.classList.add("sidebar-" + sidebar); </script> <nav id="sidebar" class="sidebar" aria-label="Table of contents"> <ol class="chapter"><li class="affix"><a href="index.html">Introduction</a></li><li><a href="getting-started/index.html"><strong aria-hidden="true">1.</strong> Getting Started</a></li><li><ol class="section"><li><a href="getting-started/installation.html"><strong aria-hidden="true">1.1.</strong> Installation</a></li><li><a href="getting-started/first-steps.html"><strong aria-hidden="true">1.2.</strong> First Steps with Cargo</a></li></ol></li><li><a href="guide/index.html"><strong aria-hidden="true">2.</strong> Cargo Guide</a></li><li><ol class="section"><li><a href="guide/why-cargo-exists.html"><strong aria-hidden="true">2.1.</strong> Why Cargo Exists</a></li><li><a href="guide/creating-a-new-project.html"><strong aria-hidden="true">2.2.</strong> Creating a New Package</a></li><li><a href="guide/working-on-an-existing-project.html"><strong aria-hidden="true">2.3.</strong> Working on an Existing Package</a></li><li><a href="guide/dependencies.html"><strong aria-hidden="true">2.4.</strong> Dependencies</a></li><li><a href="guide/project-layout.html"><strong aria-hidden="true">2.5.</strong> Package Layout</a></li><li><a href="guide/cargo-toml-vs-cargo-lock.html"><strong aria-hidden="true">2.6.</strong> Cargo.toml vs Cargo.lock</a></li><li><a href="guide/tests.html"><strong aria-hidden="true">2.7.</strong> Tests</a></li><li><a href="guide/continuous-integration.html"><strong aria-hidden="true">2.8.</strong> Continuous Integration</a></li><li><a href="guide/build-cache.html"><strong aria-hidden="true">2.9.</strong> Build Cache</a></li></ol></li><li><a href="reference/index.html"><strong aria-hidden="true">3.</strong> Cargo Reference</a></li><li><ol class="section"><li><a href="reference/specifying-dependencies.html"><strong aria-hidden="true">3.1.</strong> Specifying Dependencies</a></li><li><a href="reference/manifest.html"><strong aria-hidden="true">3.2.</strong> The Manifest Format</a></li><li><a href="reference/config.html"><strong aria-hidden="true">3.3.</strong> Configuration</a></li><li><a href="reference/environment-variables.html"><strong aria-hidden="true">3.4.</strong> Environment Variables</a></li><li><a href="reference/build-scripts.html"><strong aria-hidden="true">3.5.</strong> Build Scripts</a></li><li><a href="reference/publishing.html"><strong aria-hidden="true">3.6.</strong> Publishing on crates.io</a></li><li><a href="reference/pkgid-spec.html"><strong aria-hidden="true">3.7.</strong> Package ID Specifications</a></li><li><a href="reference/source-replacement.html"><strong aria-hidden="true">3.8.</strong> Source Replacement</a></li><li><a href="reference/external-tools.html"><strong aria-hidden="true">3.9.</strong> External Tools</a></li><li><a href="reference/registries.html"><strong aria-hidden="true">3.10.</strong> Registries</a></li><li><a href="reference/unstable.html"><strong aria-hidden="true">3.11.</strong> Unstable Features</a></li></ol></li><li><a href="commands/index.html"><strong aria-hidden="true">4.</strong> Cargo Commands</a></li><li><ol class="section"><li><a href="commands/build-commands.html"><strong aria-hidden="true">4.1.</strong> Build Commands</a></li><li><ol class="section"><li><a href="commands/cargo-bench.html"><strong aria-hidden="true">4.1.1.</strong> bench</a></li><li><a href="commands/cargo-build.html"><strong aria-hidden="true">4.1.2.</strong> build</a></li><li><a href="commands/cargo-check.html"><strong aria-hidden="true">4.1.3.</strong> check</a></li><li><a href="commands/cargo-clean.html"><strong aria-hidden="true">4.1.4.</strong> clean</a></li><li><a href="commands/cargo-doc.html"><strong aria-hidden="true">4.1.5.</strong> doc</a></li><li><a href="commands/cargo-fetch.html"><strong aria-hidden="true">4.1.6.</strong> fetch</a></li><li><a href="commands/cargo-fix.html"><strong aria-hidden="true">4.1.7.</strong> fix</a></li><li><a href="commands/cargo-run.html"><strong aria-hidden="true">4.1.8.</strong> run</a></li><li><a href="commands/cargo-rustc.html" class="active"><strong aria-hidden="true">4.1.9.</strong> rustc</a></li><li><a href="commands/cargo-rustdoc.html"><strong aria-hidden="true">4.1.10.</strong> rustdoc</a></li><li><a href="commands/cargo-test.html"><strong aria-hidden="true">4.1.11.</strong> test</a></li></ol></li><li><a href="commands/manifest-commands.html"><strong aria-hidden="true">4.2.</strong> Manifest Commands</a></li><li><ol class="section"><li><a href="commands/cargo-generate-lockfile.html"><strong aria-hidden="true">4.2.1.</strong> generate-lockfile</a></li><li><a href="commands/cargo-locate-project.html"><strong aria-hidden="true">4.2.2.</strong> locate-project</a></li><li><a href="commands/cargo-metadata.html"><strong aria-hidden="true">4.2.3.</strong> metadata</a></li><li><a href="commands/cargo-pkgid.html"><strong aria-hidden="true">4.2.4.</strong> pkgid</a></li><li><a href="commands/cargo-update.html"><strong aria-hidden="true">4.2.5.</strong> update</a></li><li><a href="commands/cargo-verify-project.html"><strong aria-hidden="true">4.2.6.</strong> verify-project</a></li></ol></li><li><a href="commands/package-commands.html"><strong aria-hidden="true">4.3.</strong> Package Commands</a></li><li><ol class="section"><li><a href="commands/cargo-init.html"><strong aria-hidden="true">4.3.1.</strong> init</a></li><li><a href="commands/cargo-install.html"><strong aria-hidden="true">4.3.2.</strong> install</a></li><li><a href="commands/cargo-new.html"><strong aria-hidden="true">4.3.3.</strong> new</a></li><li><a href="commands/cargo-search.html"><strong aria-hidden="true">4.3.4.</strong> search</a></li><li><a href="commands/cargo-uninstall.html"><strong aria-hidden="true">4.3.5.</strong> uninstall</a></li></ol></li><li><a href="commands/publishing-commands.html"><strong aria-hidden="true">4.4.</strong> Publishing Commands</a></li><li><ol class="section"><li><a href="commands/cargo-login.html"><strong aria-hidden="true">4.4.1.</strong> login</a></li><li><a href="commands/cargo-owner.html"><strong aria-hidden="true">4.4.2.</strong> owner</a></li><li><a href="commands/cargo-package.html"><strong aria-hidden="true">4.4.3.</strong> package</a></li><li><a href="commands/cargo-publish.html"><strong aria-hidden="true">4.4.4.</strong> publish</a></li><li><a href="commands/cargo-yank.html"><strong aria-hidden="true">4.4.5.</strong> yank</a></li></ol></li><li><a href="commands/general-commands.html"><strong aria-hidden="true">4.5.</strong> General Commands</a></li><li><ol class="section"><li><a href="commands/cargo-help.html"><strong aria-hidden="true">4.5.1.</strong> help</a></li><li><a href="commands/cargo-version.html"><strong aria-hidden="true">4.5.2.</strong> version</a></li></ol></li></ol></li><li><a href="faq.html"><strong aria-hidden="true">5.</strong> FAQ</a></li><li><a href="appendix/glossary.html"><strong aria-hidden="true">6.</strong> Appendix: Glossary</a></li></ol> </nav> <div id="page-wrapper" class="page-wrapper"> <div class="page"> <div id="menu-bar" class="menu-bar"> <div id="menu-bar-sticky-container"> <div class="left-buttons"> <button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar"> <i class="fa fa-bars"></i> </button> <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list"> <i class="fa fa-paint-brush"></i> </button> <ul id="theme-list" 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(Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar"> <i class="fa fa-search"></i> </button> </div> <h1 class="menu-title">The Cargo Book</h1> <div class="right-buttons"> <a href="print.html" title="Print this book" aria-label="Print this book"> <i id="print-button" class="fa fa-print"></i> </a> </div> </div> </div> <div id="search-wrapper" class="hidden"> <form id="searchbar-outer" class="searchbar-outer"> <input type="search" name="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header"> </form> <div id="searchresults-outer" class="searchresults-outer hidden"> <div id="searchresults-header" class="searchresults-header"></div> <ul id="searchresults"> </ul> </div> </div> <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM --> <script type="text/javascript"> document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible'); document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible'); Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) { link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1); }); </script> <div id="content" class="content"> <main> <a class="header" href="commands/cargo-rustc.html#cargo-rustc" id="cargo-rustc"><h1>cargo rustc</h1></a> <style> /* Include some space between definition elements. */ dd { margin-bottom: 1em; } /* asciidoctor includes extra <p> tags which causes too much spacing. */ dd p { margin-top: 0; } li p { margin: 0; } /* asciidoctor uses a content class which conflicts with mdbook's content class which causes too much spacing. */ .content { padding-bottom: 0; } </style> <h2 id="cargo_rustc_name">NAME</h2> <div class="sectionbody"> <p>cargo-rustc - Compile the current package, and pass extra options to the compiler</p> </div> <div class="sect1"> <h2 id="cargo_rustc_synopsis">SYNOPSIS</h2> <div class="sectionbody"> <div class="paragraph"> <p><code>cargo rustc [<em>OPTIONS</em>] [-- <em>ARGS</em>]</code></p> </div> </div> </div> <div class="sect1"> <h2 id="cargo_rustc_description">DESCRIPTION</h2> <div class="sectionbody"> <div class="paragraph"> <p>The specified target for the current package (or package specified by <code>-p</code> if provided) will be compiled along with all of its dependencies. The specified <em>ARGS</em> will all be passed to the final compiler invocation, not any of the dependencies. Note that the compiler will still unconditionally receive arguments such as <code>-L</code>, <code>--extern</code>, and <code>--crate-type</code>, and the specified <em>ARGS</em> will simply be added to the compiler invocation.</p> </div> <div class="paragraph"> <p>See <a href="https://doc.rust-lang.org/rustc/index.html" class="bare">https://doc.rust-lang.org/rustc/index.html</a> for documentation on rustc flags.</p> </div> <div class="paragraph"> <p>This command requires that only one target is being compiled when additional arguments are provided. If more than one target is available for the current package the filters of <code>--lib</code>, <code>--bin</code>, etc, must be used to select which target is compiled. To pass flags to all compiler processes spawned by Cargo, use the <code>RUSTFLAGS</code> environment variable or the <code>build.rustflags</code> <a href="reference/config.html">config value</a>.</p> </div> </div> </div> <div class="sect1"> <h2 id="cargo_rustc_options">OPTIONS</h2> <div class="sectionbody"> <div class="sect2"> <h3 id="cargo_rustc_package_selection">Package Selection</h3> <div class="paragraph"> <p>By default, the package in the current working directory is selected. The <code>-p</code> flag can be used to choose a different package in a workspace.</p> </div> <div class="dlist"> <dl> <dt class="hdlist1"><strong>-p</strong> <em>SPEC</em></dt> <dt class="hdlist1"><strong>--package</strong> <em>SPEC</em></dt> <dd> <p>The package to build. See <a href="commands/cargo-pkgid.html">cargo-pkgid(1)</a> for the SPEC format.</p> </dd> </dl> </div> </div> <div class="sect2"> <h3 id="cargo_rustc_target_selection">Target Selection</h3> <div class="paragraph"> <p>When no target selection options are given, <code>cargo rustc</code> will build all binary and library targets of the selected package.</p> </div> <div class="paragraph"> <p>Passing target selection flags will build only the specified targets.</p> </div> <div class="dlist"> <dl> <dt class="hdlist1"><strong>--lib</strong></dt> <dd> <p>Build the package’s library.</p> </dd> <dt class="hdlist1"><strong>--bin</strong> <em>NAME</em>…​</dt> <dd> <p>Build the specified binary. This flag may be specified multiple times.</p> </dd> <dt class="hdlist1"><strong>--bins</strong></dt> <dd> <p>Build all binary targets.</p> </dd> <dt class="hdlist1"><strong>--example</strong> <em>NAME</em>…​</dt> <dd> <p>Build the specified example. This flag may be specified multiple times.</p> </dd> <dt class="hdlist1"><strong>--examples</strong></dt> <dd> <p>Build all example targets.</p> </dd> <dt class="hdlist1"><strong>--test</strong> <em>NAME</em>…​</dt> <dd> <p>Build the specified integration test. This flag may be specified multiple times.</p> </dd> <dt class="hdlist1"><strong>--tests</strong></dt> <dd> <p>Build all targets in test mode that have the <code>test = true</code> manifest flag set. By default this includes the library and binaries built as unittests, and integration tests. Be aware that this will also build any required dependencies, so the lib target may be built twice (once as a unittest, and once as a dependency for binaries, integration tests, etc.). Targets may be enabled or disabled by setting the <code>test</code> flag in the manifest settings for the target.</p> </dd> <dt class="hdlist1"><strong>--bench</strong> <em>NAME</em>…​</dt> <dd> <p>Build the specified benchmark. This flag may be specified multiple times.</p> </dd> <dt class="hdlist1"><strong>--benches</strong></dt> <dd> <p>Build all targets in benchmark mode that have the <code>bench = true</code> manifest flag set. By default this includes the library and binaries built as benchmarks, and bench targets. Be aware that this will also build any required dependencies, so the lib target may be built twice (once as a benchmark, and once as a dependency for binaries, benchmarks, etc.). Targets may be enabled or disabled by setting the <code>bench</code> flag in the manifest settings for the target.</p> </dd> <dt class="hdlist1"><strong>--all-targets</strong></dt> <dd> <p>Build all targets. This is equivalent to specifying <code>--lib --bins --tests --benches --examples</code>.</p> </dd> </dl> </div> </div> <div class="sect2"> <h3 id="cargo_rustc_feature_selection">Feature Selection</h3> <div class="paragraph"> <p>When no feature options are given, the <code>default</code> feature is activated for every selected package.</p> </div> <div class="dlist"> <dl> <dt class="hdlist1"><strong>--features</strong> <em>FEATURES</em></dt> <dd> <p>Space or comma separated list of features to activate. These features only apply to the current directory’s package. Features of direct dependencies may be enabled with <code><dep-name>/<feature-name></code> syntax.</p> </dd> <dt class="hdlist1"><strong>--all-features</strong></dt> <dd> <p>Activate all available features of all selected packages.</p> </dd> <dt class="hdlist1"><strong>--no-default-features</strong></dt> <dd> <p>Do not activate the <code>default</code> feature of the current directory’s package.</p> </dd> </dl> </div> </div> <div class="sect2"> <h3 id="cargo_rustc_compilation_options">Compilation Options</h3> <div class="dlist"> <dl> <dt class="hdlist1"><strong>--target</strong> <em>TRIPLE</em></dt> <dd> <p>Build for the given architecture. The default is the host architecture. The general format of the triple is <code><arch><sub>-<vendor>-<sys>-<abi></code>. Run <code>rustc --print target-list</code> for a list of supported targets.</p> <div class="paragraph"> <p>This may also be specified with the <code>build.target</code> <a href="reference/config.html">config value</a>.</p> </div> </dd> <dt class="hdlist1"><strong>--release</strong></dt> <dd> <p>Build optimized artifacts with the <code>release</code> profile. See the <a href="commands/cargo-rustc.html#cargo_rustc_profiles">PROFILES</a> section for details on how this affects profile selection.</p> </dd> </dl> </div> </div> <div class="sect2"> <h3 id="cargo_rustc_output_options">Output Options</h3> <div class="dlist"> <dl> <dt class="hdlist1"><strong>--target-dir</strong> <em>DIRECTORY</em></dt> <dd> <p>Directory for all generated artifacts and intermediate files. May also be specified with the <code>CARGO_TARGET_DIR</code> environment variable, or the <code>build.target-dir</code> <a href="reference/config.html">config value</a>. Defaults to <code>target</code> in the root of the workspace.</p> </dd> </dl> </div> </div> <div class="sect2"> <h3 id="cargo_rustc_display_options">Display Options</h3> <div class="dlist"> <dl> <dt class="hdlist1"><strong>-v</strong></dt> <dt class="hdlist1"><strong>--verbose</strong></dt> <dd> <p>Use verbose output. May be specified twice for "very verbose" output which includes extra output such as dependency warnings and build script output. May also be specified with the <code>term.verbose</code> <a href="reference/config.html">config value</a>.</p> </dd> <dt class="hdlist1"><strong>-q</strong></dt> <dt class="hdlist1"><strong>--quiet</strong></dt> <dd> <p>No output printed to stdout.</p> </dd> <dt class="hdlist1"><strong>--color</strong> <em>WHEN</em></dt> <dd> <p>Control when colored output is used. Valid values:</p> <div class="ulist"> <ul> <li> <p><code>auto</code> (default): Automatically detect if color support is available on the terminal.</p> </li> <li> <p><code>always</code>: Always display colors.</p> </li> <li> <p><code>never</code>: Never display colors.</p> </li> </ul> </div> <div class="paragraph"> <p>May also be specified with the <code>term.color</code> <a href="reference/config.html">config value</a>.</p> </div> </dd> <dt class="hdlist1"><strong>--message-format</strong> <em>FMT</em></dt> <dd> <p>The output format for diagnostic messages. Valid values:</p> <div class="ulist"> <ul> <li> <p><code>human</code> (default): Display in a human-readable text format.</p> </li> <li> <p><code>json</code>: Emit JSON messages to stdout.</p> </li> <li> <p><code>short</code>: Emit shorter, human-readable text messages.</p> </li> </ul> </div> </dd> </dl> </div> </div> <div class="sect2"> <h3 id="cargo_rustc_manifest_options">Manifest Options</h3> <div class="dlist"> <dl> <dt class="hdlist1"><strong>--manifest-path</strong> <em>PATH</em></dt> <dd> <p>Path to the <code>Cargo.toml</code> file. By default, Cargo searches in the current directory or any parent directory for the <code>Cargo.toml</code> file.</p> </dd> <dt class="hdlist1"><strong>--frozen</strong></dt> <dt class="hdlist1"><strong>--locked</strong></dt> <dd> <p>Either of these flags requires that the <code>Cargo.lock</code> file is up-to-date. If the lock file is missing, or it needs to be updated, Cargo will exit with an error. The <code>--frozen</code> flag also prevents Cargo from attempting to access the network to determine if it is out-of-date.</p> <div class="paragraph"> <p>These may be used in environments where you want to assert that the <code>Cargo.lock</code> file is up-to-date (such as a CI build) or want to avoid network access.</p> </div> </dd> </dl> </div> </div> <div class="sect2"> <h3 id="cargo_rustc_common_options">Common Options</h3> <div class="dlist"> <dl> <dt class="hdlist1"><strong>-h</strong></dt> <dt class="hdlist1"><strong>--help</strong></dt> <dd> <p>Prints help information.</p> </dd> <dt class="hdlist1"><strong>-Z</strong> <em>FLAG</em>…​</dt> <dd> <p>Unstable (nightly-only) flags to Cargo. Run <code>cargo -Z help</code> for details.</p> </dd> </dl> </div> </div> <div class="sect2"> <h3 id="cargo_rustc_miscellaneous_options">Miscellaneous Options</h3> <div class="dlist"> <dl> <dt class="hdlist1"><strong>-j</strong> <em>N</em></dt> <dt class="hdlist1"><strong>--jobs</strong> <em>N</em></dt> <dd> <p>Number of parallel jobs to run. May also be specified with the <code>build.jobs</code> <a href="reference/config.html">config value</a>. Defaults to the number of CPUs.</p> </dd> </dl> </div> </div> </div> </div> <div class="sect1"> <h2 id="cargo_rustc_profiles">PROFILES</h2> <div class="sectionbody"> <div class="paragraph"> <p>Profiles may be used to configure compiler options such as optimization levels and debug settings. See <a href="reference/manifest.html#the-profile-sections">the reference</a> for more details.</p> </div> <div class="paragraph"> <p>Profile selection depends on the target and crate being built. By default the <code>dev</code> or <code>test</code> profiles are used. If the <code>--release</code> flag is given, then the <code>release</code> or <code>bench</code> profiles are used.</p> </div> <table class="tableblock frame-all grid-all fit-content"> <colgroup> <col> <col> <col> </colgroup> <thead> <tr> <th class="tableblock halign-left valign-top">Target</th> <th class="tableblock halign-left valign-top">Default Profile</th> <th class="tableblock halign-left valign-top"><code>--release</code> Profile</th> </tr> </thead> <tbody> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">lib, bin, example</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock"><code>dev</code></p></td> <td class="tableblock halign-left valign-top"><p class="tableblock"><code>release</code></p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">test, bench, or any target<br> in "test" or "bench" mode</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock"><code>test</code></p></td> <td class="tableblock halign-left valign-top"><p class="tableblock"><code>bench</code></p></td> </tr> </tbody> </table> <div class="paragraph"> <p>Dependencies use the <code>dev</code>/<code>release</code> profiles.</p> </div> </div> </div> <div class="sect1"> <h2 id="cargo_rustc_environment">ENVIRONMENT</h2> <div class="sectionbody"> <div class="paragraph"> <p>See <a href="reference/environment-variables.html">the reference</a> for details on environment variables that Cargo reads.</p> </div> </div> </div> <div class="sect1"> <h2 id="cargo_rustc_exit_status">Exit Status</h2> <div class="sectionbody"> <div class="dlist"> <dl> <dt class="hdlist1">0</dt> <dd> <p>Cargo succeeded.</p> </dd> <dt class="hdlist1">101</dt> <dd> <p>Cargo failed to complete.</p> </dd> </dl> </div> </div> </div> <div class="sect1"> <h2 id="cargo_rustc_examples">EXAMPLES</h2> <div class="sectionbody"> <div class="olist arabic"> <ol class="arabic"> <li> <p>Check if your package (not including dependencies) uses unsafe code:</p> <div class="literalblock"> <div class="content"> <pre>cargo rustc --lib -- -D unsafe-code</pre> </div> </div> </li> <li> <p>Try an experimental flag on the nightly compiler, such as this which prints the size of every type:</p> <div class="literalblock"> <div class="content"> <pre>cargo rustc --lib -- -Z print-type-sizes</pre> </div> </div> </li> </ol> </div> </div> </div> <div class="sect1"> <h2 id="cargo_rustc_see_also">SEE ALSO</h2> <div class="sectionbody"> <div class="paragraph"> <p><a href="commands/index.html">cargo(1)</a>, <a href="commands/cargo-build.html">cargo-build(1)</a>, <a href="https://doc.rust-lang.org/rustc/index.html">rustc(1)</a></p> </div> </div> </div> </main> <nav class="nav-wrapper" aria-label="Page navigation"> <!-- Mobile navigation buttons --> <a rel="prev" href="commands/cargo-run.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> <i class="fa fa-angle-left"></i> </a> <a rel="next" href="commands/cargo-rustdoc.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> <i class="fa fa-angle-right"></i> </a> <div style="clear: both"></div> </nav> </div> </div> <nav class="nav-wide-wrapper" aria-label="Page navigation"> <a href="commands/cargo-run.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> <i class="fa fa-angle-left"></i> </a> <a href="commands/cargo-rustdoc.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> <i class="fa fa-angle-right"></i> </a> </nav> </div> <script src="searchindex.js" type="text/javascript" charset="utf-8"></script> <script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script> <script src="mark.min.js" type="text/javascript" charset="utf-8"></script> <script src="searcher.js" type="text/javascript" charset="utf-8"></script> <script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script> <script src="highlight.js" type="text/javascript" charset="utf-8"></script> <script src="book.js" type="text/javascript" charset="utf-8"></script> <!-- Custom JS scripts --> </body> </html>