Linker error in Xcode build 10.1

Trying to build my unity app (uses firebase) on 2018.3.8f1 in Xcode 10.1 using xcodeworkspace file and getting the following error. App has IAP enabled, Google and FB Signin.

/clang:-1: linker command failed with exit code 1 (use -v to see invocation)

IAP and Push Notification have been enabled for this app. Further the last time I got this error my previous developer pointed me to this resource https://github.com/googlesamples/google-signin-unity

From what i recollect at that time he asked me to replace the google signin files with the ones from the github link. I tried it this time and it did not work ( I confess I am not sure if I did it correctly?).

Can someone give some tips on how to resolve this

Here are log details in Xcode for the linker error

1. Ld /Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/armv7/swatantra normal armv7 (in target: Unity-iPhone)
2. 
   
3. 
   
4. cd /Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19
5. 
   
6. 
   
7. export IPHONEOS_DEPLOYMENT_TARGET=9.0
8. 
   
9. 
   
10. /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdk -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/Bolts -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/FBSDKCoreKit -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/FBSDKLoginKit -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/FBSDKShareKit -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/FirebaseAuth -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/FirebaseCore -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/FirebaseDatabase -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/FirebaseInstanceID -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/FirebaseStorage -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/GTMSessionFetcher -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/GoogleToolboxForMac -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/GoogleUtilities -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/leveldb-library -L/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos/nanopb -L/Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19 -L/Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19/Libraries -L/Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19/Libraries/Plugins/iOS/Firebase -L/Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19/Libraries/Plugins/iOS -F/Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Products/ReleaseForRunning-iphoneos -F/Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19/Pods/Crashlytics/iOS -F/Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19/Pods/Fabric/iOS -F/Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19/Pods/FirebaseAnalytics/Frameworks -F/Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19/Pods/GoogleAppMeasurement/Frameworks -F/Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19/Pods/GoogleSignIn/Frameworks -filelist /Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/armv7/swatantra.LinkFileList -Xlinker -map -Xlinker /Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/swatantra-LinkMap-normal-armv7.txt -miphoneos-version-min=9.0 -dead_strip -Xlinker -object_path_lto -Xlinker /Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/armv7/swatantra_lto.o -fembed-bitcode-marker -stdlib=libc++ -fobjc-arc -fobjc-link-runtime -ObjC -lBolts -lFBSDKCoreKit -lFBSDKLoginKit -lFBSDKShareKit -lFirebaseAuth -lFirebaseCore -lFirebaseDatabase -lFirebaseInstanceID -lFirebaseStorage -lGTMSessionFetcher -lGoogleToolboxForMac -lGoogleUtilities -lc++ -licucore -lleveldb-library -lnanopb -lsqlite3 -lz -framework CFNetwork -framework CoreGraphics -framework CoreText -framework Crashlytics -framework FIRAnalyticsConnector -framework Fabric -framework FirebaseAnalytics -framework FirebaseCoreDiagnostics -framework Foundation -framework GoogleAppMeasurement -framework GoogleSignIn -framework LocalAuthentication -framework MobileCoreServices -framework SafariServices -framework Security -framework StoreKit -framework SystemConfiguration -framework UIKit -weak_framework Accounts -weak_framework AudioToolbox -weak_framework CoreGraphics -weak_framework CoreLocation -weak_framework Foundation -weak_framework QuartzCore -weak_framework Security -weak_framework Social -weak_framework UIKit -weak_framework CoreMotion -weak-lSystem -force_load /Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19/Libraries/Plugins/iOS/NativeKeyboard.a -all_load -framework Security -framework MediaToolbox -liPhone-lib -framework CoreText -framework AudioToolbox -weak_framework AVFoundation -framework AVKit -framework CFNetwork -framework CoreGraphics -framework CoreMedia -weak_framework CoreMotion -framework CoreVideo -framework Foundation -framework OpenAL -framework OpenGLES -framework QuartzCore -framework SystemConfiguration -framework UIKit -liconv.2 -lil2cpp -lFirebaseCppAuth -lFirebaseCppCrashlytics -lFirebaseCppAnalytics -lCrashlyticsiOSWrapper -lFirebaseCppDatabase -lFirebaseCppApp -lFirebaseCppStorage /Users/xxxxxyz/iOS\ builds/new\ ui\ 8-15-19/Libraries/Plugins/iOS/NativeKeyboard.a -framework StoreKit -framework CoreLocation -weak_framework Metal -lPods-Unity-iPhone -Xlinker -dependency_info -Xlinker /Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/armv7/swatantra_dependency_info.dat -o /Users/xxxxxyz/Library/Developer/Xcode/DerivedData/Unity-iPhone-halsmpjssjgsghdhpgbyibxicnoi/Build/Intermediates.noindex/Unity-iPhone.build/ReleaseForRunning-iphoneos/Unity-iPhone.build/Objects-normal/armv7/swatantra
11. 
    
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14. 
    
15. Undefined symbols for architecture armv7:
16. 
    
17. 
    
18. "_OBJC_CLASS_$_FIRDynamicLinks", referenced from:
19. 
    
20. 
    
21. objc-class-ref in libFirebaseCppApp.a(invites_receiver_internal_ios_fe43142c9b5429d3e0c956b7297ce932.o)
22. 
    
23. 
    
24. ld: symbol(s) not found for architecture armv7
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26. 
    
27. clang: error: linker command failed with exit code 1 (use -v to see invocation)