title: Why is Xcode on my M1 Mac trying to build for `iOS Simulator-x86_64`? Why is it not building for an `arm` based simulator?
body: <p>I have an M1 MacBook Air.</p>
  <p>When building for a simulator in Xcode, I am seeing the following warnings and errors:</p>
  <pre><code>ld: warning: ignoring file /Users/kon/Library/Developer/Xcode/DerivedData/InvisibleComputersApp-hktlnhvaoskvxkcdhnahydmbodzw/Build/Products/Debug-iphonesimulator/GoogleSignIn.o, building for iOS Simulator-x86_64 but attempting to link with file built for unknown-arm64
  ld: warning: ignoring file /Users/kon/Library/Developer/Xcode/DerivedData/InvisibleComputersApp-hktlnhvaoskvxkcdhnahydmbodzw/Build/Products/Debug-iphonesimulator/AppAuth.o, building for iOS Simulator-x86_64 but attempting to link with file built for unknown-arm64
  ld: warning: ignoring file 
  /Users/kon/Library/Developer/Xcode/DerivedData/InvisibleComputersApp-hktlnhvaoskvxkcdhnahydmbodzw/Build/Products/Debug-iphonesimulator/GTMAppAuth.o, building for iOS Simulator-x86_64 but attempting to link with file built for unknown-arm64
  ld: warning: ignoring file /Users/kon/Library/Developer/Xcode/DerivedData/InvisibleComputersApp-hktlnhvaoskvxkcdhnahydmbodzw/Build/Products/Debug-iphonesimulator/AppAuthCore.o, building for iOS Simulator-x86_64 but attempting to link with file built for unknown-arm64
  ld: warning: ignoring file /Users/kon/Library/Developer/Xcode/DerivedData/InvisibleComputersApp-hktlnhvaoskvxkcdhnahydmbodzw/Build/Products/Debug-iphonesimulator/GTMSessionFetcherCore.o, building for iOS Simulator-x86_64 but attempting to link with file built for unknown-arm64
  Undefined symbols for architecture x86_64:
    &quot;_OBJC_CLASS_$_GIDConfiguration&quot;, referenced from:
        objc-class-ref in GlobalState.o
    &quot;_OBJC_CLASS_$_GIDSignIn&quot;, referenced from:
        objc-class-ref in GoogleAuthService.o
        objc-class-ref in GoogleRefreshTokenService.o
        objc-class-ref in InvisibleComputersAppApp.o
    &quot;_OBJC_CLASS_$_GIDSignInButton&quot;, referenced from:
        objc-class-ref in LoginView.o
  ld: symbol(s) not found for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  <p>This sounds to me like Xcode is somehow trying to build an x86 binary? Why is it even trying to do that, aren't the simulators <code>arm</code> based on the M1 Macs?</p>
  <p>How can I</p>