<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/85276>85276</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Add headergen details to entrypoint implementation guide
        </td>
    </tr>

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

    <tr>
      <th>Assignees</th>
      <td>
            michaelrj-google
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          michaelrj-google
      </td>
    </tr>
</table>

<pre>
    https://libc.llvm.org/dev/implementation_standard.html

This needs to explain 

- [ ] Adding the entrypoint in spec/<some standard>.td
- [ ] Adding the entrypoint to entrypoints.txt
- [ ] Adding tests

</pre>
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