C ObjC C++ ObjC++ Warning
Enable most warning messages
+Wtype-limits
+C ObjC C++ ObjC++ Var(warn_type_limits) Init(-1) Warning
+Warn if a comparison is always true or always false due to the limited range of the data type
+
Wassign-intercept
ObjC ObjC++ Var(warn_assign_intercept) Warning
Warn whenever an Objective-C assignment is being intercepted by the garbage collector