<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/54329>54329</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            llvm-mt lacks support of `/notify_update` flag, which is required by CMake vs_link_exe.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            llvm-mt
      </td>
    </tr>

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

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

<pre>
    llvm-mt should be a drop in tool for MSVC's mt.exe. However, it only has very minimal feature implemented and `/notify_update` is not one of them. This is causing data races on LLVM windows build after https://gitlab.kitware.com/cmake/cmake/-/merge_requests/6164 was landed, in which CMake uses llvm-mt by default when it is available, and CMake relies on this feature to detect manifest file updates. The data race issue was filed as https://gitlab.kitware.com/cmake/cmake/-/issues/23305 in CMake and it was resolved by making cmake switching back to mt.exe by default.

Lacks of support for `/notify_update` flags makes it impossible to build LLVM using llvm-mt on Windows. It would be great this feature can be supported.
</pre>
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