[Bug c++/55677] New: Virtual inheritance, 'this' pointer used as constructor parameter, parameter specialized in derived method, generated binary dumps core

["x3n0m0rph59 at googlemail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55677

             Bug #: 55677
           Summary: Virtual inheritance, 'this' pointer used as
                    constructor parameter, parameter specialized in
                    derived method, generated binary dumps core
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: x3n0m0rph59@googlemail.com


If I compile the attached c++11 source with g++ and execute it, it dumps core
on my system. If I compile it with clang++ or msvc11 it works.

I don't know if the attached program source is legal C++ or not!? There is no
warning generated on any of the compilers I've tried, including g++.

The interesting part is in file 'class2.hpp'. If you replace the type 'class
middle' with 'class class1' the g++ binary doesn't dump core anymore

Does NOT work:

class2(middle *var) :
        class1(var)
    {

    }

Does work:

class2(class1 *var) :
        class1(var)
    {

    }

System:
lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 12.10
Release:    12.10
Codename:    quantal

g++ --version
g++ (Ubuntu/Linaro 4.7.2-2ubuntu1) 4.7.2