[Bug fortran/51529] New: gfortran.dg/class_to_type_1.f03 is miscompiled: Uninitialized variable used

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51529

             Bug #: 51529
           Summary: gfortran.dg/class_to_type_1.f03 is miscompiled:
                    Uninitialized variable used
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: burnus@gcc.gnu.org
                CC: pault@gcc.gnu.org


$ gfortran -g gfortran.dg/class_to_type_1.f03
$ MALLOC_PERTURB_= ./a.out
$ MALLOC_PERTURB_=33 ./a.out

A fatal error occurred! Backtrace for this error:
...
#6  0x400929 in __copy_MAIN___T2 at class_to_type_1.f03:5
#7  0x4013D1 in MAIN__ at class_to_type_1.f03:17


That's a typical sign for code which requires that "malloc" returns '\0'-set
memory, i.e. gfortran generates code which uses an uninitialized variable.