* lib/cp-support.exp: New file. * lib/cp-support.exp (cp_test_type_class): New function. * gdb.cp/derivation.exp: Use cp_test_ptype_class. * gdb.cp/virtfunc.exp (test_one_ptype): Removed. * gdb.cp/virtfunc.exp (test_ptype_of_classes): Use cp_test_ptype_class.