[Bug c++/111742] Misaligned generated code with MI using aligned virtual base

[cuzdav at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111742

--- Comment #2 from Chris Uzdavinis <cuzdav at gmail dot com> ---
No, this is not a ubsan report.
Code *crashes* and I thought showing the UBsan warning was enough to
demonstrate it.
A minimal change to make the code crash instead of just report ubsan errors:


struct X {
  void * a = nullptr;
  void * b = nullptr;
};

struct alignas(16) AlignedData { };

struct A : virtual AlignedData {
    int x = 0;       // << ********add this
  X xxx;
    int& ref = x;    // << ********and this
};

struct B : virtual AlignedData {};

struct Test : B, A {};

Test* t = new Test;

int main() {}


*** SEGFAULT ***

https://godbolt.org/z/f57vs7jxP