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List:       llvm-bugs
Subject:    [llvm-bugs] [Bug 59246] clang-cl auto mangling different from msvc
From:       LLVM Bugs via llvm-bugs <llvm-bugs () lists ! llvm ! org>
Date:       2022-11-29 9:48:07
Message-ID: 20221129094807.b62fec23ed03bf40 () email ! llvm ! org
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<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/59246>59246</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang-cl auto mangling different from msvc
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    from async_simple repo
```
async_simple::coro::detail::LazyPromiseBase::await_transform&lt;`async_simple::coro::L \
azyTest::getValueWithCV&lt;std::set&lt;int,std::less&lt;int&gt;,std::allocator&lt;int&gt; \
&gt; &gt;&apos;::`2&apos;::ValueAwaiter&gt; ```

msvc produce
```
??$await_transform@UValueAwaiter@?1???$getValueWithCV@V?$set@HU?$less@H@std@@V?$alloca \
tor@H@2@@std@@@LazyTest@coro@async_simple@@QEAA?AV?$Lazy@V?$set@HU?$less@H@std@@V?$all \
ocator@H@2@@std@@@34@V?$set@HU?$less@H@std@@V?$allocator@H@2@@std@@AEAVcondition_varia \
ble@7@AEA_NAEAHAEAVmutex@7@@Z@@LazyPromiseBase@detail@coro@async_simple@@QEAA?A_P$$QEA \
UValueAwaiter@?1???$getValueWithCV@V?$set@HU?$less@H@std@@V?$allocator@H@2@@std@@@Lazy \
Test@23@QEAA?AV?$Lazy@V?$set@HU?$less@H@std@@V?$allocator@H@2@@std@@@23@V?$set@HU?$les \
s@H@std@@V?$allocator@H@2@@std@@AEAVcondition_variable@8@AEA_NAEAHAEAVmutex@8@@Z@@Z \
```

clang-cl produce
```
??$await_transform@UValueAwaiter@?1???$getValueWithCV@V?$set@HU?$less@H@std@@V?$alloca \
tor@H@2@@std@@@LazyTest@coro@async_simple@@QEAA?AV?$Lazy@V?$set@HU?$less@H@std@@V?$all \
ocator@H@2@@std@@@34@V?$set@HU?$less@H@std@@V?$allocator@H@2@@std@@AEAVcondition_varia \
ble@7@AEA_NAEAHAEAVmutex@7@@Z@@LazyPromiseBase@detail@coro@async_simple@@QEAA?A?&lt;au \
to&gt;@@$$QEAUValueAwaiter@?1???$getValueWithCV@V?$set@HU?$less@H@std@@V?$allocator@H@ \
2@@std@@@LazyTest@23@QEAA?AV?$Lazy@V?$set@HU?$less@H@std@@V?$allocator@H@2@@std@@@23@V \
?$set@HU?$less@H@std@@V?$allocator@H@2@@std@@AEAVcondition_variable@9@AEA_NAEAHAEAVmutex@9@@Z@@Z
 ```

reduced
```
clang 
?&lt;auto&gt;@@ 
vs
msvc latest preview
_P
```

clang-cl version
```
C:\Github\async_simple\build4&gt;clang-cl -v
clang version 16.0.0 (https://github.com/llvm/llvm-project.git \
                ca3c58f0d119458d3361494ed8e92a9fca368b6a)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\LLVM\bin
```

cl version
```
C:\Github\async_simple\build4&gt;cl -v
Microsoft (R) C/C++ Optimizing Compiler Version 19.35.32019 for x64
```

other auto mangling issues
#45314 
#43552
#51342
</pre>
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