<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/100032>100032</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Implement 'P1902R1 Missing feature-test macros 2018-2019'
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc++,
            c++20
      </td>
    </tr>

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

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

<pre>
    Related: #99986, #100006 
</pre>
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