title: How to fix the "Undefined symbols for architecture arm64:" error in Xcode after building a Unity project?
body: <p>In my Unity project I wanna use <a href="https://github.com/googleads/googleads-mobile-unity" rel="nofollow noreferrer">Google Mobile Ads</a> and when I build it for Xcode and try to launch on a device, I get the next error.</p>
  
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  <p>This is what I'm getting.
  ld: warning: <strong>arm64 function not 4-byte aligned: _unwind_tester from /path_to_my_project/Libraries/libiPhone-lib.a(unwind_test_arm64.o).
  Undefined symbols for architecture arm64:</strong>.</p>
  
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  <p><a href="https://i.stack.imgur.com/lXEKO.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lXEKO.jpg" alt="enter image description here"></a>
  <a href="https://i.stack.imgur.com/DVH5t.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DVH5t.png" alt="enter image description here"></a></p>