title: Xcode building for iOS Simulator, but linking in an object file built for iOS, for architecture 'arm64'
body: <p>I am trying to get a large (and working on Xcode 11!) project building in Xcode 12 (beta 5) to prepare for iOS 14. The codebase was previously in Objective-C, but now it contains both Objective-C and Swift, and uses pods that are Objective-C and/or Swift as well.</p>
  <p>I have pulled the new beta of <a href="https://en.wikipedia.org/wiki/CocoaPods" rel="noreferrer">CocoaPods</a> with Xcode 12 support (currently 1.10.0.beta 2).</p>
  <p>Pod install is successful.  When I do a build, I get the following error on a pod framework:</p>
  <blockquote>
  <p>building for iOS Simulator, but linking in object file built for iOS, for architecture arm64</p>
  </blockquote>
  <p>and possibly also the error:</p>
  <blockquote>
  <p>Unable to load standard library for target 'arm64-apple-ios11.0'</p>
  </blockquote>
  <p>When I go run <code>lipo -info</code> on the framework, it has: armv7s armv7 i386 x86_64 arm64.</p>
  <p>Previously, the project had <em>Valid Architectures</em> set to: armv7, armv7s and arm64.</p>
  <p>In Xcode 12, that setting goes away, as per Apple's documentation.  Architectures is set to $(ARCHS_STANDARD).  I have nothing set in excluded architectures.</p>
  <p>What may be going on here?  I have not been able to reproduce this with a simpler project yet.</p>