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                    <h1 class="menu-title">rules_rust</h1>

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                        <h1 id="cargo"><a class="header" href="#cargo">Cargo</a></h1>
<p>Rules for interoperating with tooling from the <a href="https://doc.rust-lang.org/cargo/">Cargo</a> ecosystem — most
importantly, Cargo <a href="https://doc.rust-lang.org/cargo/reference/build-scripts.html"><code>build.rs</code> scripts</a>. These rules let a Bazel
build consume the same crate-side conventions that Cargo uses (build scripts,
generated env vars, <code>[lints]</code> tables) without switching build systems.</p>
<h2 id="rules"><a class="header" href="#rules">Rules</a></h2>
<ul>
<li><a href="./cargo_build_script.html">cargo_build_script</a> — Compile and run a crate's
<code>build.rs</code> at build time, then feed the emitted <code>cargo:*</code> directives (env vars,
link args, rerun-if-changed inputs) into consumers of the crate.</li>
<li><a href="./cargo_env.html">cargo_env</a> — Helper that returns Cargo's standard
<code>CARGO_*</code> env-var dict, used by rules that need to reproduce Cargo's
compilation environment.</li>
<li><a href="./extract_cargo_lints.html">extract_cargo_lints</a> — Read the <code>[lints]</code> table
from a <code>Cargo.toml</code> and produce a <a href="./rust_lint_config.html"><code>rust_lint_config</code></a>
target from it, so Cargo-defined lints apply to Bazel-built crates.</li>
</ul>
<h2 id="toolchain"><a class="header" href="#toolchain">Toolchain</a></h2>
<ul>
<li><a href="./cargo_toolchain.html">cargo_toolchain</a> — Provide the <code>cargo</code> binary that
<code>cargo_build_script</code> exposes to build scripts as <code>$CARGO</code> and that
<a href="./crates_vendor.html">crates_vendor</a> runs. Registered for
<code>@rules_rust//cargo:toolchain_type</code>, which rules declare as
<code>rust_common.cargo_toolchain_type</code>. The same page documents <code>find_cargo</code>, which
falls back to the <code>cargo</code> of the <code>rust_toolchain</code> when no <code>cargo_toolchain</code> is
registered.</li>
</ul>

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