Linker can't find _objc_msgSend and many other symbols

Question

So , i have two problems with Xcode . I'm new in the iPhone app development so that any help would be useful . I'm creating an app with a mapView , so first i did everything as it should be . Declaration , view did load , delegates and so on . After that i connected it the property to the map view , and it turned out 28 errors..On the simulator it works , including the map , but on the phone it always breaks . And after that i deleted all the code that's for the map view, it stayed the same .

Some ideas what could this be ? how to make a map view for iPhone ?

"_OBJC_CLASS_$_NSBundle", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_NSFileManager", referenced from:
      objc-class-ref in AppDelegate.o
  "_objc_msgSendSuper2", referenced from:
      -[AppDelegate dealloc] in AppDelegate.o
      -[MainViewController didReceiveMemoryWarning] in MainViewController.o
      -[MainViewController viewDidLoad] in MainViewController.o
      -[MainViewController viewDidUnload] in MainViewController.o
      -[MainViewController viewWillAppear:] in MainViewController.o
      -[MainViewController viewDidAppear:] in MainViewController.o
      -[MainViewController viewWillDisappear:] in MainViewController.o
      ...
  "_objc_setProperty", referenced from:
      -[AppDelegate setWindow:] in AppDelegate.o
      -[MainViewController setManagedObjectContext:] in MainViewController.o
      -[MainViewController setOdaberiTaxi:] in MainViewController.o
      -[MainViewController setIzbornik:] in MainViewController.o
      -[MainViewController setTaxiPicker:] in MainViewController.o
      -[MainViewController setListaTaxiZG:] in MainViewController.o
      -[MainViewController setToolbar:] in MainViewController.o
      ...
  "__objc_empty_vtable", referenced from:
      _OBJC_CLASS_$_AppDelegate in AppDelegate.o
      _OBJC_METACLASS_$_AppDelegate in AppDelegate.o
      _OBJC_CLASS_$_MainViewController in MainViewController.o
      _OBJC_METACLASS_$_MainViewController in MainViewController.o
      _OBJC_CLASS_$_FlipsideViewController in FlipsideViewController.o
      _OBJC_METACLASS_$_FlipsideViewController in FlipsideViewController.o
  "_OBJC_CLASS_$_UIResponder", referenced from:
      _OBJC_CLASS_$_AppDelegate in AppDelegate.o
  "_objc_msgSend", referenced from:
      _main in main.o
      -[AppDelegate dealloc] in AppDelegate.o
      -[AppDelegate application:didFinishLaunchingWithOptions:] in AppDelegate.o
      -[AppDelegate applicationWillTerminate:] in AppDelegate.o
      -[AppDelegate saveContext] in AppDelegate.o
      -[AppDelegate managedObjectContext] in AppDelegate.o
      -[AppDelegate managedObjectModel] in AppDelegate.o
      ...
  "_OBJC_CLASS_$_UIActionSheet", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_CLASS_$_UIViewController", referenced from:
      _OBJC_CLASS_$_MainViewController in MainViewController.o
      _OBJC_CLASS_$_FlipsideViewController in FlipsideViewController.o
  "_objc_autoreleasePoolPop", referenced from:
      _main in main.o
  "__objc_empty_cache", referenced from:
      _OBJC_CLASS_$_AppDelegate in AppDelegate.o
      _OBJC_METACLASS_$_AppDelegate in AppDelegate.o
      _OBJC_CLASS_$_MainViewController in MainViewController.o
      _OBJC_METACLASS_$_MainViewController in MainViewController.o
      _OBJC_CLASS_$_FlipsideViewController in FlipsideViewController.o
      _OBJC_METACLASS_$_FlipsideViewController in FlipsideViewController.o
  "_UIApplicationMain", referenced from:
      _main in main.o
  "_OBJC_METACLASS_$_UIResponder", referenced from:
      _OBJC_METACLASS_$_AppDelegate in AppDelegate.o
  "_OBJC_CLASS_$_UIView", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_CLASS_$_UIApplication", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_CLASS_$_NSArray", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_CLASS_$_NSManagedObjectContext", referenced from:
      objc-class-ref in AppDelegate.o
  "___CFConstantStringClassReference", referenced from:
      CFString in AppDelegate.o
      CFString in AppDelegate.o
      CFString in AppDelegate.o
      CFString in AppDelegate.o
      CFString in MainViewController.o
      CFString in MainViewController.o
      CFString in MainViewController.o
      ...
  "_OBJC_CLASS_$_UIAlertView", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_METACLASS_$_UIViewController", referenced from:
      _OBJC_METACLASS_$_MainViewController in MainViewController.o
      _OBJC_METACLASS_$_FlipsideViewController in FlipsideViewController.o
  "_NSSQLiteStoreType", referenced from:
      -[AppDelegate persistentStoreCoordinator] in AppDelegate.o
  "_objc_autoreleasePoolPush", referenced from:
      _main in main.o
  "_NSStringFromClass", referenced from:
      _main in main.o
  "_NSLog", referenced from:
      -[AppDelegate saveContext] in AppDelegate.o
      -[AppDelegate persistentStoreCoordinator] in AppDelegate.o
  "_OBJC_CLASS_$_NSManagedObjectModel", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_NSURL", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_METACLASS_$_NSObject", referenced from:
      _OBJC_METACLASS_$_AppDelegate in AppDelegate.o
      _OBJC_METACLASS_$_MainViewController in MainViewController.o
      _OBJC_METACLASS_$_FlipsideViewController in FlipsideViewController.o
  "_OBJC_CLASS_$_NSPersistentStoreCoordinator", referenced from:
      objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

I had a similar error and this solved my problem : Click "TARGETS" > Build Phases >Link Binary With Libraries > Click "+" > CoreData.framework. > Add.

Answer 2

If in 2022 you're hitting a large number of Xcode linker errors of the type

Undefined symbols for architecture arm64: "_objc_msgSend$X"

where X is an method internal to the library being linked, then you have likely struck a new Xcode 14 feature, Objective-C msgsend selector stubs. This optimisation will prevent a library being correctly linked via Xcode 13 and earlier.

If linking of a static library built with Xcode 14 with an earlier version of Xcode is required, the selector stub generation can be disabled during compilation by adding -fno-objc-msgsend-selector-stubs to the compiler flags.