https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110245
--- Comment #2 from Andrew Pinski ---
So if I read: https://cplusplus.github.io/CWG/issues/2558.html there is still
an open question about "Union types shall be initialized such that they have an
active member in the result of a constant express
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110245
--- Comment #1 from danakj at orodu dot net ---
Note that GCC has no problem with doing this constexpr construction if the
object is not stored as an lvalue.
```
struct Store {
constexpr Store() {}
union {
int i;
};
bool
