243 lines
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<main>
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<h1 id="command-line-arguments"><a class="header" href="#command-line-arguments">Command-line Arguments</a></h1>
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<p>Command-line flags are documented in the <a href="https://doc.rust-lang.org/rustc/command-line-arguments.html">rustc book</a>. All <em>stable</em>
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flags should be documented there. Unstable flags should be documented in the
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<a href="https://doc.rust-lang.org/nightly/unstable-book/">unstable book</a>.</p>
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<p>See the <a href="https://forge.rust-lang.org/compiler/proposals-and-stabilization.html#compiler-flags">forge guide for new options</a> for details on the <em>procedure</em> for
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adding a new command-line argument.</p>
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<h2 id="guidelines"><a class="header" href="#guidelines">Guidelines</a></h2>
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<ul>
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<li>Flags should be orthogonal to each other. For example, if we'd have a
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json-emitting variant of multiple actions <code>foo</code> and <code>bar</code>, an additional
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<code>--json</code> flag is better than adding <code>--foo-json</code> and <code>--bar-json</code>.</li>
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<li>Avoid flags with the <code>no-</code> prefix. Instead, use the <a href="https://github.com/rust-lang/rust/blob/e5335592e78354e33d798d20c04bcd677c1df62d/src/librustc_session/options.rs#L307-L313"><code>parse_bool</code></a> function,
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such as <code>-C embed-bitcode=no</code>.</li>
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<li>Consider the behavior if the flag is passed multiple times. In some
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situations, the values should be accumulated (in order!). In other
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situations, subsequent flags should override previous flags (for example,
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the lint-level flags). And some flags (like <code>-o</code>) should generate an error
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if it is too ambiguous what multiple flags would mean.</li>
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<li>Always give options a long descriptive name, if only for more understandable
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compiler scripts.</li>
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<li>The <code>--verbose</code> flag is for adding verbose information to <code>rustc</code>
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output. For example, using it with the <code>--version</code>
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flag gives information about the hashes of the compiler code.</li>
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<li>Experimental flags and options must be guarded behind the <code>-Z unstable-options</code> flag.</li>
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