llvm/test/FrontendC++/2009-09-09-packed-layout.cpp

// RUN: %llvmgxx -S -m32 %s -o /dev/null
class X { 
 public:
  virtual ~X();
  short y;
};
#pragma pack(push, 1)
class Z : public X {
 public: enum { foo = ('x') };
 virtual int y() const;
};
#pragma pack(pop)
class Y : public X {
public: enum { foo = ('y'), bar = 0 };
};
X x;
Y y;
Z z;