ios_hello_world_err.txt

Undefined symbols for architecture arm64:
  "_CFStringCreateWithCString", referenced from:
      _main in ios_hello_world-cc7860.o
  "_UIApplicationMain", referenced from:
      _main in ios_hello_world-cc7860.o
  "_class_addMethod", referenced from:
      _main in ios_hello_world-cc7860.o
  "_class_addProtocol", referenced from:
      _main in ios_hello_world-cc7860.o
  "_class_createInstance", referenced from:
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
  "_objc_allocateClassPair", referenced from:
      _main in ios_hello_world-cc7860.o
  "_objc_autoreleasePoolPop", referenced from:
      _main in ios_hello_world-cc7860.o
  "_objc_autoreleasePoolPush", referenced from:
      _main in ios_hello_world-cc7860.o
  "_objc_getClass", referenced from:
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
  "_objc_getProtocol", referenced from:
      _main in ios_hello_world-cc7860.o
  "_objc_msgSend", referenced from:
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      ...
  "_objc_registerClassPair", referenced from:
      _main in ios_hello_world-cc7860.o
  "_sel_getUid", referenced from:
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      _main in ios_hello_world-cc7860.o
      ...
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)