[Bug c++/27952] New: [4.0/4.1/4.2 Regression] ICE with invalid virtual inheritance

["reichelt at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The following testcase with invalid virtual inheritance ICEs since GCC 4.0.0:

==================================
struct A
{
    virtual ~A() {}
};

struct B : A, virtual A {};

struct C : A, B {};

C c;
==================================

bug.cc:6: error: duplicate base type 'A' invalid
bug.cc:8: warning: direct base 'A' inaccessible in 'C' due to ambiguity
bug.cc: In destructor 'virtual C::~C()':
bug.cc:8: internal compiler error: Segmentation fault
Please submit a full bug report, [etc.]

A more reduced version crashes since GCC 4.1.0:

==================================
struct A {};

struct B : A, virtual A {};

struct C : B {};
==================================

bug.cc:7: error: duplicate base type 'A' invalid
bug.cc:9: internal compiler error: Segmentation fault
Please submit a full bug report, [etc.]


-- 
           Summary: [4.0/4.1/4.2 Regression] ICE with invalid virtual
                    inheritance
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, error-recovery, monitored
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27952