[Bug c++/117475] C++20: Union object with atomic integer cannot be statically initialized

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117475

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |---
     Ever confirmed|1                           |0

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Doing this:
union U {
  S s{};
};

Works.


So the problem is the testcase provided is invalid code but here is a testcase
which works with clang but fails with GCC:
```
#include <atomic>

typedef std::atomic_int Atomic_Int;

struct S {
  Atomic_Int v;
};

union U {
  int t = 0;
  S s;
};

U obj;
```