Use the config flag instead of always True

theano/gof/cc.py

@@ -285,8 +285,8 @@ def get_c_declare(r, name, sub):
     if ((any([getattr(c.op, 'check_input', config.check_input)
               for (c, _) in r.clients
               if not isinstance(c, string_types)]) or
-         (r.owner and getattr(r.owner.op, 'check_input', True)))):
-
+         (r.owner and
+          getattr(r.owner.op, 'check_input', config.check_input)))):
         c_declare = r.type.c_declare(name, sub, True)
     else:
         c_declare = r.type.c_declare(name, sub, False)