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| <h1 id="rules_rust_bindgen"><a class="header" href="#rules_rust_bindgen">rules_rust_bindgen</a></h1> |
| <p>These rules are for using <a href="https://github.com/rust-lang/rust-bindgen">Bindgen</a> to generate <a href="http://www.rust-lang.org/">Rust</a> bindings to C (and some C++) libraries.</p> |
| <h2 id="rules"><a class="header" href="#rules">Rules</a></h2> |
| <ul> |
| <li><a href="#rust_bindgen">rust_bindgen</a></li> |
| <li><a href="#rust_bindgen_library">rust_bindgen_library</a></li> |
| <li><a href="#rust_bindgen_toolchain">rust_bindgen_toolchain</a></li> |
| </ul> |
| <h2 id="setup"><a class="header" href="#setup">Setup</a></h2> |
| <p>To use the Rust bindgen rules, add the following to your <code>MODULE.bazel</code> file:</p> |
| <pre><code class="language-python">bazel_dep(name = "rules_rust_bindgen", version = "{SEE_RELEASE_NOTES}") |
| </code></pre> |
| <p>rules_rust_bindgen does not automatically register a bindgen toolchain. |
| You need to register either your own or the default toolchain by adding the following to your <code>MODULE.bazel</code> file:</p> |
| <pre><code class="language-python">register_toolchains("@rules_rust_bindgen//:default_bindgen_toolchain") |
| </code></pre> |
| <p>The default toolchain builds libclang from source via the <a href="https://registry.bazel.build/modules/llvm-project">llvm-project</a> bazel_dep. |
| <a href="https://github.com/bazelbuild/rules_rust/tree/main/examples/bindgen_toolchain">examples/bindgen_toolchain</a> shows how to use a prebuilt libclang.</p> |
| <p>Bindgen aims to be as hermetic as possible so will end up building <code>libclang</code> from <a href="https://github.com/llvm/llvm-project">llvm-project</a> from |
| source. If this is found to be undesirable, users should define their own repositories using something akin to |
| <a href="https://bazelbuild.github.io/rules_rust/crate_universe_bzlmod.html">crate_universe</a> and define their own toolchains following the instructions for |
| <a href="#rust_bindgen_toolchain">rust_bindgen_toolchain</a>.</p> |
| <hr /> |
| <hr /> |
| <p><a id="rust_bindgen"></a></p> |
| <h2 id="rust_bindgen"><a class="header" href="#rust_bindgen">rust_bindgen</a></h2> |
| <pre> |
| load("@rules_rust_bindgen//:defs.bzl", "rust_bindgen") |
| |
| rust_bindgen(<a href="#rust_bindgen-name">name</a>, <a href="#rust_bindgen-bindgen_flags">bindgen_flags</a>, <a href="#rust_bindgen-cc_lib">cc_lib</a>, <a href="#rust_bindgen-clang_flags">clang_flags</a>, <a href="#rust_bindgen-header">header</a>, <a href="#rust_bindgen-merge_cc_lib_objects_into_rlib">merge_cc_lib_objects_into_rlib</a>, |
| <a href="#rust_bindgen-wrap_static_fns">wrap_static_fns</a>) |
| </pre> |
| <p>Generates a rust source file from a cc_library and a header.</p> |
| <p><strong>ATTRIBUTES</strong></p> |
| <div class="table-wrapper"><table><thead><tr><th style="text-align: left">Name</th><th style="text-align: left">Description</th><th style="text-align: left">Type</th><th style="text-align: left">Mandatory</th><th style="text-align: left">Default</th></tr></thead><tbody> |
| <tr><td style="text-align: left"><a id="rust_bindgen-name"></a>name</td><td style="text-align: left">A unique name for this target.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels#target-names">Name</a></td><td style="text-align: left">required</td><td style="text-align: left"></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen-bindgen_flags"></a>bindgen_flags</td><td style="text-align: left">Flags to pass directly to the bindgen executable. See https://rust-lang.github.io/rust-bindgen/ for details.</td><td style="text-align: left">List of strings</td><td style="text-align: left">optional</td><td style="text-align: left"><code>[]</code></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen-cc_lib"></a>cc_lib</td><td style="text-align: left">The cc_library that contains the <code>.h</code> file. This is used to find the transitive includes.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels">Label</a></td><td style="text-align: left">required</td><td style="text-align: left"></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen-clang_flags"></a>clang_flags</td><td style="text-align: left">Flags to pass directly to the clang executable.</td><td style="text-align: left">List of strings</td><td style="text-align: left">optional</td><td style="text-align: left"><code>[]</code></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen-header"></a>header</td><td style="text-align: left">The <code>.h</code> file to generate bindings for.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels">Label</a></td><td style="text-align: left">required</td><td style="text-align: left"></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen-merge_cc_lib_objects_into_rlib"></a>merge_cc_lib_objects_into_rlib</td><td style="text-align: left">When True, objects from <code>cc_lib</code> will be copied into the <code>rlib</code> archive produced by the rust_library that depends on this <code>rust_bindgen</code> rule (using <code>BuildInfo</code> provider)</td><td style="text-align: left">Boolean</td><td style="text-align: left">optional</td><td style="text-align: left"><code>True</code></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen-wrap_static_fns"></a>wrap_static_fns</td><td style="text-align: left">Whether to create a separate .c file for static fns. Requires nightly toolchain, and a header that actually needs this feature (otherwise bindgen won't generate the file and Bazel complains).</td><td style="text-align: left">Boolean</td><td style="text-align: left">optional</td><td style="text-align: left"><code>False</code></td></tr> |
| </tbody></table> |
| </div> |
| <p><a id="rust_bindgen_toolchain"></a></p> |
| <h2 id="rust_bindgen_toolchain"><a class="header" href="#rust_bindgen_toolchain">rust_bindgen_toolchain</a></h2> |
| <pre> |
| load("@rules_rust_bindgen//:defs.bzl", "rust_bindgen_toolchain") |
| |
| rust_bindgen_toolchain(<a href="#rust_bindgen_toolchain-name">name</a>, <a href="#rust_bindgen_toolchain-bindgen">bindgen</a>, <a href="#rust_bindgen_toolchain-clang">clang</a>, <a href="#rust_bindgen_toolchain-default_rustfmt">default_rustfmt</a>, <a href="#rust_bindgen_toolchain-libclang">libclang</a>, <a href="#rust_bindgen_toolchain-libstdcxx">libstdcxx</a>) |
| </pre> |
| <p>The tools required for the <code>rust_bindgen</code> rule.</p> |
| <p>This rule depends on the <a href="https://crates.io/crates/bindgen"><code>bindgen</code></a> binary crate, and it |
| in turn depends on both a clang binary and the clang library. To obtain these dependencies, |
| <code>rust_bindgen_dependencies</code> imports bindgen and its dependencies.</p> |
| <pre><code class="language-python">load("@rules_rust_bindgen//:defs.bzl", "rust_bindgen_toolchain") |
| |
| rust_bindgen_toolchain( |
| name = "bindgen_toolchain_impl", |
| bindgen = "//my/rust:bindgen", |
| clang = "//my/clang:clang", |
| libclang = "//my/clang:libclang.so", |
| libstdcxx = "//my/cpp:libstdc++", |
| ) |
| |
| toolchain( |
| name = "bindgen_toolchain", |
| toolchain = "bindgen_toolchain_impl", |
| toolchain_type = "@rules_rust_bindgen//:toolchain_type", |
| ) |
| </code></pre> |
| <p>This toolchain will then need to be registered in the current <code>WORKSPACE</code>. |
| For additional information, see the <a href="https://docs.bazel.build/versions/master/toolchains.html">Bazel toolchains documentation</a>.</p> |
| <p><strong>ATTRIBUTES</strong></p> |
| <div class="table-wrapper"><table><thead><tr><th style="text-align: left">Name</th><th style="text-align: left">Description</th><th style="text-align: left">Type</th><th style="text-align: left">Mandatory</th><th style="text-align: left">Default</th></tr></thead><tbody> |
| <tr><td style="text-align: left"><a id="rust_bindgen_toolchain-name"></a>name</td><td style="text-align: left">A unique name for this target.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels#target-names">Name</a></td><td style="text-align: left">required</td><td style="text-align: left"></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_toolchain-bindgen"></a>bindgen</td><td style="text-align: left">The label of a <code>bindgen</code> executable.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels">Label</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>None</code></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_toolchain-clang"></a>clang</td><td style="text-align: left">The label of a <code>clang</code> executable.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels">Label</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>None</code></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_toolchain-default_rustfmt"></a>default_rustfmt</td><td style="text-align: left">If set, <code>rust_bindgen</code> targets will always format generated sources with <code>rustfmt</code>.</td><td style="text-align: left">Boolean</td><td style="text-align: left">optional</td><td style="text-align: left"><code>True</code></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_toolchain-libclang"></a>libclang</td><td style="text-align: left">A cc_library providing bindgen's runtime dependency on libclang. This attribute is required for hermeticity when bindgen is dynamically linked. If None, bindgen must be statically linked; else, system libraries will be used instead.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels">Label</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>None</code></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_toolchain-libstdcxx"></a>libstdcxx</td><td style="text-align: left">A cc_library that satisfies libclang's libstdc++ dependency. This is used to make the execution of clang hermetic. If None, system libraries will be used instead.</td><td style="text-align: left"><a href="https://bazel.build/concepts/labels">Label</a></td><td style="text-align: left">optional</td><td style="text-align: left"><code>None</code></td></tr> |
| </tbody></table> |
| </div> |
| <p><a id="rust_bindgen_library"></a></p> |
| <h2 id="rust_bindgen_library"><a class="header" href="#rust_bindgen_library">rust_bindgen_library</a></h2> |
| <pre> |
| load("@rules_rust_bindgen//:defs.bzl", "rust_bindgen_library") |
| |
| rust_bindgen_library(<a href="#rust_bindgen_library-name">name</a>, <a href="#rust_bindgen_library-header">header</a>, <a href="#rust_bindgen_library-cc_lib">cc_lib</a>, <a href="#rust_bindgen_library-bindgen_flags">bindgen_flags</a>, <a href="#rust_bindgen_library-bindgen_features">bindgen_features</a>, <a href="#rust_bindgen_library-clang_flags">clang_flags</a>, |
| <a href="#rust_bindgen_library-wrap_static_fns">wrap_static_fns</a>, <a href="#rust_bindgen_library-kwargs">**kwargs</a>) |
| </pre> |
| <p>Generates a rust source file for <code>header</code>, and builds a rust_library.</p> |
| <p>Arguments are the same as <code>rust_bindgen</code>, and <code>kwargs</code> are passed directly to rust_library.</p> |
| <p><strong>PARAMETERS</strong></p> |
| <div class="table-wrapper"><table><thead><tr><th style="text-align: left">Name</th><th style="text-align: left">Description</th><th style="text-align: left">Default Value</th></tr></thead><tbody> |
| <tr><td style="text-align: left"><a id="rust_bindgen_library-name"></a>name</td><td style="text-align: left">A unique name for this target.</td><td style="text-align: left">none</td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_library-header"></a>header</td><td style="text-align: left">The label of the .h file to generate bindings for.</td><td style="text-align: left">none</td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_library-cc_lib"></a>cc_lib</td><td style="text-align: left">The label of the cc_library that contains the .h file. This is used to find the transitive includes.</td><td style="text-align: left">none</td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_library-bindgen_flags"></a>bindgen_flags</td><td style="text-align: left">Flags to pass directly to the bindgen executable. See https://rust-lang.github.io/rust-bindgen/ for details.</td><td style="text-align: left"><code>None</code></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_library-bindgen_features"></a>bindgen_features</td><td style="text-align: left">The <code>features</code> attribute for the <code>rust_bindgen</code> target.</td><td style="text-align: left"><code>None</code></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_library-clang_flags"></a>clang_flags</td><td style="text-align: left">Flags to pass directly to the clang executable.</td><td style="text-align: left"><code>None</code></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_library-wrap_static_fns"></a>wrap_static_fns</td><td style="text-align: left">Whether to create a separate .c file for static fns. Requires nightly toolchain, and a header that actually needs this feature (otherwise bindgen won't generate the file and Bazel complains",</td><td style="text-align: left"><code>False</code></td></tr> |
| <tr><td style="text-align: left"><a id="rust_bindgen_library-kwargs"></a>kwargs</td><td style="text-align: left">Arguments to forward to the underlying <code>rust_library</code> rule.</td><td style="text-align: left">none</td></tr> |
| </tbody></table> |
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