<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63635>63635</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang shouldn't silently ignore multiple `abi_tag`s
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          philnik777
      </td>
    </tr>
</table>

<pre>
    Currently, clang silently ignores a second `abi_tag` attribute on functions (maybe also other symbols, I haven't checked). GCC does the same thing, but instead ignored the first `abi_tag`, leading to differently mangled names. I think it's fine to only allow a single attribute, but there should be some sort of diagnostic.

https://godbolt.org/z/G5ra4Mvvc

</pre>
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