<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/89579>89579</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [libc++] [modules] Defining __cpp_lib_modules
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc++
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          ChuanqiXu9
      </td>
    </tr>
</table>

<pre>
    See https://github.com/cppalliance/boost2/issues/1#issuecomment-2068737245

I guess the reason why libc++ doesn't define this is that it is still under experimental. I registered this issue to track this. 

Maybe we can define the macro earlier to make it easier for people to try it?
</pre>
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