How to solve “duplicate symbol” when added Firebase in Xcode

Question

I can\'t solve the error \"duplicate symbol\".

The error is

duplicate symbol _GSDK_NSClassFromString in: .../Pods/FirebaseCore/Frameworks/FirebaseCore.fr         


        

Answer 1

I solved the issue by

1. Deleting everything from my podfile and running pod install
2. Putting everything back in my podfile and running pod install

It's the only thing that worked for me.

Answer 2

There was a Firebase build issue introduced in 3.11.1 that will be fixed in 3.13.0 that can cause the duplicate symbol problem. In the meantime, a workaround is to back up to Firebase 3.11.0, by annotating any Firebase subspecs in your podfile with an explicit version number, like :

pod 'Firebase/Analytics', '3.11.0'

Answer 3

I had the same issue. It seems that the -all_load flag in the Other Linker Flags is causing this.