<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/148814>148814</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang-tidy should not guess compile commands
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          t-a-james
      </td>
    </tr>
</table>

<pre>
    If clang-tidy fails to find an entry in the compile commands database it guesses at some flags.  For my project (and, I suspect, for any non-trivial project) these flags are always catastrophically wrong.  clang-tidy then gives back garbage results.

I would like clang-tidy to simply error out if it's given a compile commands database and a file, but fails to find an entry for the file.

That would be a change in default behaviour.  I think the new behaviour would be simpler and less unexpected than the current behaviour, but if that's considered too big a change we could introduce a flag to re-instate the old behaviour, or keep the old default and hide the new behaviour behind a flag.
</pre>
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