[Bug c++/103681] [9/10/11/12 Regression] Unusual behavior for tail padding with different c++ standards and NSDMI

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103681

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
compile-time testcase

struct A {
  long l;
  char c = -1;
};
struct B : public A {
  char d;
};

#define SA(X) static_assert(X,#X)
SA(sizeof (B) == sizeof (A) || alignof (long) < 2*sizeof(char));