[Bug c++/20746] New: Incorrect return value for covariant return function returning null ptr

[yanliu at ca dot ibm dot com]

Using g++3.4.3 (gcc version 3.4.3 20041212 (Red Hat 3.4.3-9.EL4)) to compile a 
testcase with covariant return types. In the testcase, the covariant function 
C::l() returns a null pointer, g++3.4.3 does the return value adjustment and 
returns a non-null return value ( which is incorrectly).
Here is the steps to reproduce the problem and the execution result:
>g++ t.C
>a.out 
in C* C::l
cp=0x8

-- 
           Summary: Incorrect return value for covariant return function
                    returning null ptr
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: yanliu at ca dot ibm dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20746