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

I had the same problem after upgrading to Xcode 5.1 and fixed it by setting Architectures to armv7 armv7s

Answer 2

Solved after deleting the content of the DerivedData-->Build-->Products-->Debug-iphoneos

Answer 3

If you faced this issue on your Flutter project while building in Release mode (or Archive) check out my this answer: https://stackoverflow.com/a/61446892/5502121 Long story short:

• set your build system to New Build System in File > Project Settings…
• remove ios and build_ios folders
• run flutter create . to init new ios module
• run pod install
• run flutter pub get
• check your Xcode build config (it should be Release mode and General iOS Device)

and you're good to go

Answer 4

For me, I use opencv 2.4.9 in xcode 7.2 for iOS and the errors above occurred, and I solve the errors by using the opencv through pod install rather than offline opencv framework.

You can have a try by adding the opencv pod text below and delete the offline opencv framework if you have used.

pod 'OpenCV', '2.4.9'

Answer 5

"The OPN [Debug] target overrides the OTHER_LDFLAGS build setting". This was the main issue. After adding $(inherited) in new line in other linker flags solved my issue.

Answer 6

I fixed mine by checking the selected implementation files in the target membership on the right side. This is useful especially in dealing with extensions i.e. custom keyboards.