When I build Firebase with Xcode 11.3.1 it has this error
Undefined symbols for architecture x86_64:
“OBJC_CLASS$_GULHeartbeatDateStorage”, referenced from:
objc-class-ref in FirebaseCore(FIRHeartbeatInfo.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I used Cocos Creator v2.3.0