<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/79659>79659</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang: __HAVE_FUNCTION_MULTIVERSIONING is mis-reported in previously-shipped compilers
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang,
            backend:AArch64
      </td>
    </tr>

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

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

<pre>
    Clang's FMV support implicitly depends on support for ifuncs, which until recently [1, 2] weren't supported on Darwin platforms. This means that previously-shipped compilers report that they support it via the pre-defined macro, even when the feature does not work.

1: https://github.com/llvm/llvm-project/pull/73686
2: https://github.com/llvm/llvm-project/pull/73688/files#diff-7930fda388572c1b90c30151343a92d058fd44508c32406a6a955bec9e83ce82R1426
</pre>
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