<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/126127>126127</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] -Wsystem-headers doesn't show up in `diagtool tree` output
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

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

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

<pre>
    I was trying to recall exactly what the flag was for `-Wsystem-headers` so I reached for `diagtool tree | grep system` and it was not listed.  I wonder if there's a reason why `-Wsystem-headers` isn't listed, and if due to that reason (or others) additional flags aren't being reported by `diagtool tree`.

labeling this with the clang label, even though the bug might be elsewhere, for eyes from clang maintainers.
</pre>
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