[Bug c++/106614] New: GCC skips using copy constructor when creating object using direct initialization in A a({A{}});

[Bug c++/106614] New: GCC skips using copy constructor when creating object using direct initialization in A a({A{}});

[jlame646 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106614

            Bug ID: 106614
           Summary: GCC skips using copy constructor when creating object
                    using direct initialization in A a({A{}});
           Product: gcc
           Version: 12.1.1
            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 program prints `0` instead of `1` with gcc.
https://gcc.godbolt.org/z/WEz336E3r

```
#include <iostream>

struct A {
    int v = 0;
    A() {}
    A(const A &) : v(1) {}
};

int main() {
    A a({A{}});
    std::cout << a.v;  //this prints 0 in gcc instead of 1
}
```

The above program should print `0` as per dcl.init#17.6. The same program is
discussed here: https://stackoverflow.com/q/73345030/12002570