<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/57633>57633</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Backport [libc++][format] Updates feature-test macros.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc++,
            release:backport
      </td>
    </tr>

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

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

<pre>
    @ldionne tried to create a backport request but noticed a merge conflict. So I created the request instead.

/branch mordante/llvm-project/backport-D133271
</pre>
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