242 lines
12 KiB
HTML
242 lines
12 KiB
HTML
<!DOCTYPE HTML>
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<html lang="en" class="light sidebar-visible" dir="ltr">
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<head>
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<title>Writing tools in Bootstrap - Rust Compiler Development Guide</title>
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<meta name="description" content="A guide to developing the Rust compiler (rustc)">
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<h1 class="menu-title">Rust Compiler Development Guide</h1>
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<div id="content" class="content">
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<main>
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<h1 id="writing-tools-in-bootstrap"><a class="header" href="#writing-tools-in-bootstrap">Writing tools in Bootstrap</a></h1>
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<p>There are three types of tools you can write in bootstrap:</p>
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<ul>
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<li>
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<p><strong><code>Mode::ToolBootstrap</code></strong>
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Use this for tools that don’t need anything from the in-tree compiler and can run with the stage0 <code>rustc</code>.
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The output is placed in the "bootstrap-tools" directory. This mode is for general-purpose tools built
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entirely with the stage0 compiler, including target libraries and only works for stage 0.</p>
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</li>
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<li>
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<p><strong><code>Mode::ToolStd</code></strong>
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Use this for tools that rely on the locally built std. The output goes into the "stageN-tools" directory.
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This mode is rarely used, mainly for <code>compiletest</code> which requires <code>libtest</code>.</p>
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</li>
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<li>
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<p><strong><code>Mode::ToolRustc</code></strong>
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Use this for tools that depend on both the locally built <code>rustc</code> and the target <code>std</code>. This is more complex than
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the other modes because the tool must be built with the same compiler used for <code>rustc</code> and placed in the "stageN-tools"
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directory. When you choose <code>Mode::ToolRustc</code>, <code>ToolBuild</code> implementation takes care of this automatically.
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If you need to use the builder’s compiler for something specific, you can get it from <code>ToolBuildResult</code>, which is
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returned by the tool's <a href="https://doc.rust-lang.org/nightly/nightly-rustc/bootstrap/core/builder/trait.Step.html"><code>Step</code></a>.</p>
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</li>
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</ul>
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<p>Regardless of the tool type you must return <code>ToolBuildResult</code> from the tool’s <a href="https://doc.rust-lang.org/nightly/nightly-rustc/bootstrap/core/builder/trait.Step.html"><code>Step</code></a> implementation and use <code>ToolBuild</code> inside it.</p>
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</main>
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