fnonnull-objects
C++ ObjC++
+fnothrow-opt
+C++ ObjC++ Optimization Var(flag_nothrow_opt)
+Treat a throw() exception specification as noexcept to improve code size
+
; Generate special '- .cxx_construct' and '- .cxx_destruct' methods
; to initialize any non-POD ivars in Objective-C++ classes.
fobjc-call-cxx-cdtors