У меня такая же проблема при использовании FirebaseDynamicLinks
Также добавлен -ObjC в настройках сборки "Other Linker Flag"
Импортировано в AppDelegate.m
#import "AppDelegate.h"
#import "FirebaseCore/FIRApp.h"
#import "FirebaseCore/FIROptions.h"
#import "FirebaseDynamicLinks/FIRDynamicLinks.h"
ОШИБКА:
Undefined symbols for architecture armv7:
"OBJC_CLASS$_FIRComponent", referenced from:
objc-class-ref in FirebaseDynamicLinks(FIRDynamicLinks.o)
"OBJC_CLASS$_FIRDependency", referenced from:
objc-class-ref in FirebaseDynamicLinks(FIRDynamicLinks.o)
"OBJC_CLASS$_FIRComponentType", referenced from:
objc-class-ref in FirebaseDynamicLinks(FIRDynamicLinks.o)
"OBJC_CLASS$_FIRComponentContainer", referenced from:
objc-class-ref in FirebaseDynamicLinks(FIRDynamicLinks.o)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)