Undefined symbols for architecture arm64

Question

I am getting a Apple Mach-O Linker Error everytime I import a file from CocoaPods.

Undefined symbols for architecture arm64:
  \"_OBJC_CLASS_$_FBSession\", r         


        

Answer 1

Here are some explanations why build_active_architecture is set to NO. Xcode now detects which devices you have connected and will set the active architecture accordingly. So if you plug a 2nd generation iPod Touch into your computer, Xcode should set the active architecture to armv6. Building your target with the above Debug configuration will now only build the armv6 binary to save time (unless you have a huge project you may not notice the difference but I guess the seconds add up over time).

When you create a Distribution configuration for publishing to the App Store, you should make sure this option is not set, so that Xcode will instead build the fat universal binary http://useyourloaf.com/blog/2010/04/21/xcode-build-active-architecture-only.html