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From: "oleksandr.koval.dev at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109623] New: constexpr restrictions are not relaxed enough
Date: Tue, 25 Apr 2023 16:36:36 +0000
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X-Bugzilla-Component: c++
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109623

            Bug ID: 109623
           Summary: constexpr restrictions are not relaxed enough
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: oleksandr.koval.dev at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/eo8K3Ehqq

```cpp
#include <unordered_map>

struct S{
    constexpr S() =3D default;       // error, not implicitly constexpr
    constexpr S(){}                // this works
    std::unordered_map<int, int> m;
};

```

My understanding is that in C++23 this should be allowed because the only
restriction for constexpr constructors and destructors is the absence of
virtual base classes.=