title: Linker command Error when build Unity iOS project Locally
body: <p>I did an super easy test of Firebase authentication, and I found this error that makes me impossible to build the application in iOS (xCode). I understand that people that will read this have some knowledges of this process, I will not deep in the explanation).</p>
  <p>xCode: 8.3.2</p>
  <p>Unity: 5.6.1</p>
  <p>Cocoa Pod: 1.2.1</p>
  <blockquote>
  <p>Install Unity</p>
  <p>Create a new Project.</p>
  <p>Add Firebase SDK package to the project.</p>
  <p>Add a CreateUserByEmailAndPassword (same as example in firebase.google.com): <a href="https://firebase.google.com/docs/auth/web/password-auth?hl=es-419" rel="nofollow noreferrer">https://firebase.google.com/docs/auth/web/password-auth?hl=es-419</a></p>
  <p>Add that Component code to an GameObject.</p>
  <p>Build project.</p>
  <p>Open workspace in xCode.</p>
  <p>Fix signing issues.</p>
  <p>Build Project.</p>
  </blockquote>
  <p>The Error here is:</p>
  <pre><code>ld: warning: arm64 function not 4-byte aligned: ltmp0 from /Users/brankofuenzalidalorca/Documents/Builds/iOS-1.6/Libraries/libiPhone-lib.a(unwind_test_arm64.o)
  ld: warning: arm64 function not 4-byte aligned: _unwind_tester from /Users/brankofuenzalidalorca/Documents/Builds/iOS-1.6/Libraries/libiPhone-lib.a(unwind_test_arm64.o)
  &quot;_OBJC_CLASS_$_FIREmailPasswordAuthProvider&quot;, referenced from:
  objc-class-ref in libAuth.a(credential_ios_ef8c3cf45c3329a5e5902f99026c639a.o)
  ld: symbol(s) not found for architecture arm64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  <p>It is not necessary to say that the code it is working correctly in Unity IDE. Another thing that I checked, when I did this test, was build the project in Unity to xCode and then build again but in xCode project.</p>
  <p>Until I included the code, the project could build correcly in xCode. But, when I typed the code It stopped working.</p>
  <p>¿Any idea?</p>
  <p>Thanks.</p>