[Bug fortran/47180] [OOP] EXTENDS_TYPE_OF returns the wrong result for disassociated polymorphic pointers

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47180

--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-01-05 18:18:34 UTC ---
Compiling revision 168524 gives:

../../work/gcc/fortran/trans-expr.c: In function 'gfc_trans_class_assign':
../../work/gcc/fortran/trans-expr.c:6172:42: error: 'vtab' may be used
uninitialized in this function [-Werror=uninitialized]
cc1: all warnings being treated as errors