<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/76588>76588</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            LLVM does not build with libc++ built without threading support.
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          veluca93
      </td>
    </tr>
</table>

<pre>
    As per title, if one builds `libc++` without threading support, the resulting `libc++` cannot then be used to build `llvm` (or other llvm projects).

This is also true if one passes `-DLLVM_ENABLE_THREADS=OFF` to the CMake build script.

The error messages are numerous, generally coming from unguarded usage of C++ thread primitives all over the codebase.
</pre>
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