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List:       llvm-bugs
Subject:    [llvm-bugs] [Bug 63617] Missing "no return statement in constexpr function" error for a templated co
From:       LLVM Bugs via llvm-bugs <llvm-bugs () lists ! llvm ! org>
Date:       2023-06-30 9:40:36
Message-ID: 20230630094036.2e009f4a749f3ea0 () 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/63617>63617</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Missing &quot;no return statement in constexpr function&quot; error for a \
templated constexpr function  </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          strimo378
      </td>
    </tr>
</table>

<pre>
    Hi all,

I found a case where clang issues a warning about &quot;non-void function does not \
return a value&quot; for a constexpr function. For constexpr function, clang \
typically issues an error and no warning.

The code to generate the warning is

```
template &lt;class...&gt; struct a {};
template &lt;class... b&gt; constexpr a&lt;typename b ::c...&gt; d() {}
auto e = d();

//constexpr int f() {}
```

Or a link to compiler explorer https://godbolt.org/z/1rd4W8exr
</pre>
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