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From: "jlame646 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107945] New: GCC accepts invalid program involving
 constexpr static data member of class template
Date: Thu, 01 Dec 2022 13:20:05 +0000
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X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107945

            Bug ID: 107945
           Summary: GCC accepts invalid program involving constexpr static
                    data member of class template
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jlame646 at gmail dot com
  Target Milestone: ---

The following invalid program is accepted by gcc but rejected by clang and
msvc. https://godbolt.org/z/WGz3f75da

```
struct incomplete;
template<typename T> struct C
{
    static constexpr T t{};
};

template<class T>
struct myClass {
    C<T> new_t() { return {}; }
};

int main() {
    myClass<incomplete> d;
    d.new_t();=20=20=20=20
}
```=