<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/134780>134780</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [libc][bazel] Add support for generating headers in Bazel
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc,
            bazel
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          vonosmas
      </td>
    </tr>
</table>

<pre>
    Currently, there's no supported way to invoke hdrgen tool from Bazel build. In order to support generating headers in Bazel build we need to:

- [ ] Add integration with [pyyaml](https://github.com/yaml/pyyaml) to Bazel build. Otherwise, Bazel-build libc:hdrgen py_binary can't run, since it fails in "import yaml" statement.
- [ ] Add `libc_generated_header` macro to wrap genrule that would invoke hdrgen tool to generate public libc header from YAML file.
- [ ] Use `libc_generated_header` for some of the common headers important for downstream users.
- [ ] Add support for running header tests: libc/test/include has a lot of unit tests, which are not ported to Bazel currently.
- [ ] (optional) add a convenient way to group generated headers, expose them together, and let llvm-libc users depend on them, similar to how `libc_release_library` is used to expose a subset of llvm-libc functions.
</pre>
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