c++/9221: Incorrect dynamic cast failure

[bangerth@dealii.org]

Synopsis: Incorrect dynamic cast failure

State-Changed-From-To: open->closed
State-Changed-By: bangerth
State-Changed-When: Tue Jan  7 14:02:10 2003
State-Changed-Why:
    I can confirm this problem, although probably not in the
    manner you would like: the fact that the program compiled at
    all with 3.2 was the bug -- you use covariant return types 
    for the clone function. gcc3.2 did not support this, but
    accepted the code nevertheless. It works as expected
    when you change the line
      D* clone () const ...
    into
      B2* clone () const ...
    
    With the original code, you get with gcc3.2.2pre and
    3.3 CVS versions the following message:
      x.cc:15: sorry, unimplemented: adjusting pointers for covariant returns
    
    Nathan has implemented covariant return types recently for
    the 3.4 mainline (for which I can confirm that the program
    works as expected), so this will be available in the
    overnext version.
    
    Regards
      Wolfgang

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9221