When using Podfile for developing iOS 7 app with Xcode5, we always got this issue.
After some searching, seems like no final resolve from CocoaPods ? Maybe resolved at this moment when you see this.
How to resolve such issues right now ?
The issue was: Pods was rejected as an implicit dependency for 'libPods.a' because its architectures 'armv7 armv7s' didn't contain all required architectures 'armv7 armv7s arm64'