<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/133725>133725</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            `std::any` is still broken with `visbility=hidden` and `libc++` when used cross DSO boundaries
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc++
      </td>
    </tr>

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

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

<pre>
    This is related to https://github.com/llvm/llvm-project/issues/48743 which seems to have fixed this issue for `libstdc++`, but apparently there are remaining problems when using `libc++`:

libc++ with clang-20.1.0: https://godbolt.org/z/4TW4rMYoe note that the typeid name is the same, but the hash differs already:
```
NSt3__110shared_ptrI10WrappedIntEE 134520565932116
NSt3__110shared_ptrI10WrappedIntEE 105617327562758
```

this then leads to:

```
libc++abi: terminating due to uncaught exception of type std::bad_any_cast: bad any cast
Program terminated with signal: SIGSEGV
```

If we don't enforce `libc++` and thus default to `libstdc++` then everything works:

https://godbolt.org/z/bsGvfzWsh
```
St10shared_ptrI10WrappedIntE 6190920035151885185
St10shared_ptrI10WrappedIntE 6190920035151885185
```
</pre>
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