[Bug ipa/64139] [4.9/5 Regression] ice in possible_polymorphic_call_targets, at ipa-devirt.c:2410

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64139

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |trippels at gcc dot gnu.org
            Summary|[5 Regression] ice in       |[4.9/5 Regression] ice in
                   |possible_polymorphic_call_t |possible_polymorphic_call_t
                   |argets, at                  |argets, at
                   |ipa-devirt.c:2410           |ipa-devirt.c:2410
      Known to fail|                            |4.9.1, 5.0

--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
reduced test case:

class IObject {
public:
  virtual ~IObject();
};
class A {
  virtual int m_fn1();
};
class B {
public:
  virtual int m_fn2(B) const;
};
class D : IObject, public virtual B {};
class G : public D, A {
public:
  G(A);
};
class F : B {
  friend class C;
};
class C {
  void m_fn3(const IObject &, int &);
  void m_fn4(const B &, int &);
};
A a;
void C::m_fn3(const IObject &, int &p2) {
  G r(a);
  m_fn4(r, p2);
}
void C::m_fn4(const B &p1, int &) {
  F b;
  p1.m_fn2(b);
}

Also ICEs with gcc-4.9:

trippels@gcc20 ~ % g++ -c -O2 bug178.cc
bug178.cc: In member function ‘void C::m_fn3(const IObject&, int&)’:
bug178.cc:32:1: internal compiler error: in possible_polymorphic_call_targets,
at ipa-devirt.c:1557