<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/62127>62127</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang generates symbol name which we can't demangle
        </td>
    </tr>

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

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

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

<pre>
    With the attached source code [a.ii.gz](https://github.com/llvm/llvm-project/files/11231199/a.ii.gz), Clang generates a symbol which llvm can't demangle:

```
$ clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -std=c++20 -w a.ii -S -emit-llvm -o - | grep declare.*__to_address_helper
declare noundef i32 @_ZNSt2Cr12__to_addressINS_16reverse_iteratorIPNS_4pairIjmEEEEvEEu7__decayIDTclsr19__to_address_helperIT_EE6__callclsr3stdE7declvalIRKS6_EEEEES8_(ptr noundef nonnull align 1 dereferenceable(1)) #1

$ llvm-cxxfilt _ZNSt2Cr12__to_addressINS_16reverse_iteratorIPNS_4pairIjmEEEEvEEu7__decayIDTclsr19__to_address_helperIT_EE6__callclsr3stdE7declvalIRKS6_EEEEES8_
_ZNSt2Cr12__to_addressINS_16reverse_iteratorIPNS_4pairIjmEEEEvEEu7__decayIDTclsr19__to_address_helperIT_EE6__callclsr3stdE7declvalIRKS6_EEEEES8_
```

(Originally from https://crbug.com/1078788#c22)


</pre>
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