Several levels of virtual inheritance: bug?

[Benjamin Redelings I <bredelin at ucla dot edu>]

Hello,

	I have found (what seems to be) a bug in todays CVS version of g++ 4.0. 
 The reduced testcase no logner calls the wrong virtual function, but 
it still crashes.  Additionally it is all one file now.
	I attatched a reduced test-case (test-smodel.C).  Here is the output:

Output in 3.4:
subst model = EQU
subst model = EQU
subst model = EQU


Output in 4.0 CVS:
subst model = EQU
subst model = D\uffff
Segmentation fault

Should I file a bug in bugzilla for this?

-BenRI
#include <string>
#include <iostream>

using std::string;

struct Model {
  bool full_tree;      // if you remove this, the error goes away
  virtual Model* clone() const =0;
  virtual std::string name() const =0;
  virtual ~Model() {}  // if you remove this, the error goes away
};

struct R: virtual public Model {
  virtual R* clone() const =0;
};

struct A: virtual public Model {
  virtual A* clone() const=0;
};

struct RA: public R, public A {
  virtual RA* clone() const=0;
};

//--------------------- EQU  Model ------------------------//
struct EQU: public RA {
  virtual EQU* clone() const {return new EQU(*this);}
  string name() const {return "EQU";}
};

int main() {

  Model* M1 = new EQU();
  Model* M2 = M1->clone();
  Model* M3 = M2->clone();

  std::cout<<"subst model = "<<M1->name()<<std::endl;
  std::cout<<"subst model = "<<M2->name()<<std::endl;
  std::cout<<"subst model = "<<M3->name()<<std::endl;

  return 0;
}