<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/83407>83407</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            __builtin_cpu_supports should accept unknown options
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang,
            backend:ARM,
            backend:PowerPC,
            backend:X86
      </td>
    </tr>

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

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

<pre>
    Backward\forward compatibility reasons any string shaped parameter in __builtin_cpu_supports should be accepted.
A given codebase might use a valid features that is supported in a new toolchain but not in the previous version.

```__builtin_cpu_supports("unsupported-features")``` 

It is valid to turn this into a constant false when the feature is not supported by the compiler.


see #82378
</pre>
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