React Native Fix Bug – Fix duplicate symbols khi tích hợp Firebase và Goolge Sign In SDK

Khi làm với project cần tích hợp Firebase và Google Sign In SDKs thủ công mình đã gặp mỗi lỗi trong quá trình compile:
ld: 171 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Đấy dùng đúng như doc của google và firebase mà cũng bị lỗi đó nói chung là lúc đầu mình cũng chả hiểu gì luôn sau đó thì google và điều kì diệu đã xảy ra. Mình đã thấy một bác bị lỗi tương tự trên Stackoverflow và tuyệt vời hơn là bên dưới có một bác đưa ra hẳn Solution cho các lỗi liên quan đến Dublicate symbols luôn. Nếu bạn nào bị thì có thể dùng cách này để fix giờ thì mình sẽ hướng dẫn cụ thể nhé:
Đây là log lỗi

Ld /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/supercredit.app/supercredit normal x86_64
    cd /Users/tuananh/scg.app.main/ios
    export IPHONEOS_DEPLOYMENT_TARGET=10
    export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator11.4.sdk -L/Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator -L/Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher -L/Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GoogleToolboxForMac -L/Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/nanopb -F/Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator -F/Users/tuananh/scg.app.main/ios/Pods/FirebaseAnalytics/Frameworks -F/Users/tuananh/scg.app.main/ios/Pods/FirebaseAuth/Frameworks -F/Users/tuananh/scg.app.main/ios/Pods/FirebaseCore/Frameworks -F/Users/tuananh/scg.app.main/ios/Pods/FirebaseInstanceID/Frameworks -F/Users/tuananh/scg.app.main/ios/../node_modules/react-native-facebook-login/FacebookSDK -F/Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2 -filelist /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Intermediates.noindex/supercredit.build/Debug-iphonesimulator/supercredit.build/Objects-normal/x86_64/supercredit.LinkFileList -Xlinker -rpath -Xlinker @executable_path/Frameworks -mios-simulator-version-min=10 -Xlinker -object_path_lto -Xlinker /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Intermediates.noindex/supercredit.build/Debug-iphonesimulator/supercredit.build/Objects-normal/x86_64/supercredit_lto.o -Xlinker -no_deduplicate -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -L/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphonesimulator -Xlinker -add_ast_path -Xlinker /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Intermediates.noindex/supercredit.build/Debug-iphonesimulator/supercredit.build/Objects-normal/x86_64/supercredit.swiftmodule -ObjC -lGTMSessionFetcher -lGoogleToolboxForMac -lc++ -lnanopb -lsqlite3 -lz -framework FirebaseAnalytics -framework FirebaseAuth -framework FirebaseCore -framework FirebaseCoreDiagnostics -framework FirebaseInstanceID -framework FirebaseNanoPB -framework SafariServices -framework Security -framework StoreKit -framework SystemConfiguration -ObjC -lc++ -Xlinker -sectcreate -Xlinker __TEXT -Xlinker __entitlements -Xlinker /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Intermediates.noindex/supercredit.build/Debug-iphonesimulator/supercredit.build/supercredit.app-Simulated.xcent /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRNImagePicker.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTFBLogin.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTBlob.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTAnimation.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libReact.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTAnimation.a -framework GoogleSignInDependencies -framework GoogleSignIn /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTActionSheet.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTGeolocation.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTImage.a -framework FBSDKShareKit /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTLinking.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTNetwork.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTSettings.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTText.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTVibration.a /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/libRCTWebSocket.a -framework FBSDKCoreKit -lRNVectorIcons -lPods-supercredit -lRNFirebase -framework FBSDKLoginKit -lz -framework SafariServices -framework SystemConfiguration -framework AddressBook -lCodePush -Xlinker -dependency_info -Xlinker /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Intermediates.noindex/supercredit.build/Debug-iphonesimulator/supercredit.build/Objects-normal/x86_64/supercredit_dependency_info.dat -o /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/supercredit.app/supercredit
duplicate symbol _GTMNSDictionaryURLArgumentsExportToSuppressLibToolWarning in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GoogleToolboxForMac/libGoogleToolboxForMac.a(GTMNSDictionary+URLArguments.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMNSDictionary+URLArguments_aec9c2446af4c2ac5a7380b418b337ea.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._taskPriority in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._servicePriority in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _kGTMSessionFetcherElapsedIntervalWithRetriesKey in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _kGTMSessionFetcherCompletionErrorKey in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _kGTMSessionFetcherNumberOfRetriesDoneKey in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _kGTMSessionFetcherStatusDataKey in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _kGTMSessionFetcherCompletionDataKey in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionCookieStorage._policy in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._serviceHost in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._request in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._allowLocalhostRequest in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._retryCount in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._testBlockAccumulateDataChunkCount in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._comment in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._allowInvalidServerCertificates in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._allowedInsecureSchemes in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._properties in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionCookieStorage._cookies in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _GTMSessionFetcherAssertValidSelector in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._retryFactor in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._downloadFinishedError in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._authorizer in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._retryTimer in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._completionHandler in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _GTMFetcherApplicationIdentifier in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._sessionIdentifier in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._didCreateSessionIdentifier in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcher._backgroundTaskIdentifier in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_CLASS_$_GTMSessionFetcher in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcher_77fa8c792419468cdbb2fc3b72ce99c3.o)
duplicate symbol _OBJC_METACLASS_$_GTMSessionFetcher in:
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duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadFileHandle in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionUploadFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_f8011a605fea9da397aa70783bbcfab0.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._recentChunkStatusCode in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionUploadFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_f8011a605fea9da397aa70783bbcfab0.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._isPaused in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionUploadFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_f8011a605fea9da397aa70783bbcfab0.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._isRestartedUpload in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionUploadFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_f8011a605fea9da397aa70783bbcfab0.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadData in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionUploadFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_f8011a605fea9da397aa70783bbcfab0.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadLocationURL in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionUploadFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_f8011a605fea9da397aa70783bbcfab0.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadFileURL in:
    /Users/tuananh/Library/Developer/Xcode/DerivedData/supercredit-cwmhzspueoawxbclpydbzixuluzr/Build/Products/Debug-iphonesimulator/GTMSessionFetcher/libGTMSessionFetcher.a(GTMSessionUploadFetcher.o)
    /Users/tuananh/scg.app.main/ios/google_signin_sdk_4_1_0-2/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_f8011a605fea9da397aa70783bbcfab0.o)
ld: 171 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Lý do gây ra lỗi duplicate symbols là do cả trong thư viện Firebase và Google Sign In đều chứa các class chung và sử dụng -ObjC or -all_load flag
Coppy file GoogleSignInDependencies ra bên ngoài GoogleSignInDependencies.framework cho vào một finder khác ở đây minh đặt là PATH
Mở terminal và cd vào file PATH trên
$ cd PATH
Chaỵ lệnh sau để lấy thông tin về fat library
$ lipo -info GoogleSignInDependencies
Bạn sẽ thấy kết quả hiện ra như sau:
Architectures in the fat file: GoogleSignInDependencies are: armv7 i386 x86_64 arm64
Như bạn thấy có 4 architectures trong fat file
Lấy các thin files(file chứa code cho chỉ 1 architecture) từ fat file bằng cách run lệnh commands sau

$ lipo -thin armv7 GoogleSignInDependencies -output armv7.a
$ lipo -thin i386 GoogleSignInDependencies -output i386.a
$ lipo -thin x86_64 GoogleSignInDependencies -output x86_64.a
$ lipo -thin arm64 GoogleSignInDependencies -output arm64.a

Bạn sẽ nhận được 4 thin file có tên là armv7.a, i386.a, x86_64.a và arm64.a.
Xoá file GoogleSignInDependencies, ta không cần nó nữa
Tạo 4 thư mục mới có tên armv7, i386, x86_64 và arm64. Sau đó di chuyển các thin file armv7.a, i386.a, x86_64.a và arm64.a vào các thư mục tương ứng. Bạn nên có một cấu trúc thư mục như sau.

arm64
-----arm64.a
armv7
-----armv7.a
i386
-----i386.a
x86_64
-----x86_64.a

Đi đến từng thư mục trong số 4 thư mục từ terminal và extract các object file (*.0) từ các thin file dùng commands sau:

$ cd armv7
$ ar -x armv7.a
$ cd ../i386
$ ar -x i386.a
$ cd ../x86_64
$ ar -x x86_64.a
$ cd ../arm64
$ ar -x arm64.a

Sau khi chạy các lệnh này, mỗi trong số 4 thư mục sẽ chứa các tệp sau. (Điều này có thể thay đổi trong các phiên bản sau.)

__.SYMDEF
GTMGeometryUtils_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMLogger_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMNSDictionary+URLArguments_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMNSString+URLArguments_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMOAuth2Authentication_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMOAuth2SignIn_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMOAuth2ViewControllerTouch_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMSessionFetcher_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMSessionFetcherLogging_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMSessionFetcherService_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMSessionUploadFetcher_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMSynchronizationAsserts_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o

Xóa các tệp đang conflic với thư viện Firebase từ mỗi thư mục trong số 4 thư mục. Bạn cần xóa 6 tệp này. (Điều này có thể thay đổi trong các phiên bản sau.)

GTMLogger_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMNSDictionary+URLArguments_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMSessionFetcher_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMSessionFetcherLogging_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMSessionFetcherService_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o
GTMSessionUploadFetcher_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.o

Lưu ý: Vì tuỳ mỗi phiên bản sẽ có các file khác nhau các bạn nên xem trong lại log có khi không phải xoá tất cả các file trong mỗi finder như nhau trong finder nào thừa file nào thì mới xoá file đó bên trên chỉ là ví dụ nên các bạn cần chú ý kỹ không sau này sẽ rất khó tìm lỗi hoặc nó vẫn báo duplicate symbols
Xoá các thin file armv7.a, i386.a, x86_64.a và arm64.a.
Combine các đối tượng còn lại thành các thin file và chạy lệnh command sau:

$ cd armv7
$ libtool -static *.o -o armv7-new.a
$ cd ../i386
$ libtool -static *.o -o i386-new.a
$ cd ../x86_64
$ libtool -static *.o -o x86_64-new.a
$ cd ../arm64
$ libtool -static *.o -o arm64-new.a

Copy các thin file mới tạo armv7-new.a, i386-new.a, x86_64-new.a và arm64-new.a vào finder mới với tên là PATH_NEW. Có thể xoá mọi thứ trong file PATH nếu đảm bảo là bạn đã đúng rồi.
Combine các thin file mới thành một fat file bằng cách run lệnh:

$ cd PATH_NEW
$ lipo -create armv7-new.a i386-new.a x86_64-new.a arm64-new.a -output GoogleSignInDependencies-new

Sử dụng mới GoogleSignInDependencies mới được tạo ra thay cho GoogleSignInDependencies trong dự án Xcode của bạn.
Kêt: Công việc của các bạn rất dễ chỉ cần làm theo các câu lệnh trên là được nhưng cần rất cẩn thận so sánh log để biết cần xoá file nào. Có những chỗ đều phải xoá các file giống nhau có những chỗ chỉ cần xoá 1 file. Rất mong sẽ giúp ích được các bạn.
Nếu các bạn muốn hiểu sâu hơn thì có thể đọc link sau:
http://atnan.com/blog/2012/01/12/avoiding-duplicate-symbol-errors-during-linking-by-removing-classes-from-static-libraries

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