primary2.c

gcc-you can use this code to learn something about gcc, and inquire further into linux,

// Copyright (C) 2000 Free Software Foundation, Inc.
// Contributed by Nathan Sidwell 4 February 2001 <[e-mail]>

// Check primary bases are chosen correctly.

struct A {virtual void Foo () {}};
struct B : virtual A {};
struct C : virtual B {};
struct D : virtual B, virtual C {};

int main ()
{
  D d;

#if __GXX_ABI_VERSION >= 100
  if (sizeof (D) != sizeof (A))
    return 1;
#endif

  return 0;
}