I am getting duplicate symbols error when integrating Firebase and Google Sign In SDKs manually in my existing iOS project.
The related SO question here didn't help as it uses Cocoapods.
Firebase and Google Signin giving duplicate symbols error
Steps I have taken in chronological order:
Copied Analytics, Auth and Database folder along with Firebase.h file from the downloaded Firebase SDK (3.11.0) into my project and added to targets.
Copied the GoogleService-Info.plist into the project and added to targets.
Added the -ObjC flag to other linker flags.
Copied the necessary frameworks and bundles from the downloaded Google Sign In SDK (4.0.1) into my project and added to targets.
Linked the necessary frameworks and libraries.
Here is the related project structure:
Firebase
Analytics
FirebaseAnalytics.framework
FirebaseCore.framework
FirebaseInstanceId.framework
GoogleInterchangeUtilities.framework
GoogleSymbolUtilities.framework
GoogleToolboxForMac.framework
Auth
FirebaseAuth.framework
GTMSessionFetcher.framework
GoogleSignIn
GoogleAppUtilities.framework
GoogleSignIn.bundle
GoogleSignIn.framework
GoogleSignInDependencies.framework
GoogleSymbolUtilities.framework (removed as Firebase Analytics already includes it)
Here is the error log (truncated):
Ld /Users/Ehtesham/Library/Developer/Xcode/DerivedData/AddressBookGoogleMaps-hbtfxxvykazaogbfqnnraeuywtdt/Build/Products/Debug-iphonesimulator/AddressBookGoogleMaps.app/AddressBookGoogleMaps normal x86_64
cd /Projects/iOS/AddressBookGoogleMaps
export IPHONEOS_DEPLOYMENT_TARGET=8.0
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/iPhoneSimulator10.2.sdk -L/Users/Ehtesham/Library/Developer/Xcode/DerivedData/AddressBookGoogleMaps-hbtfxxvykazaogbfqnnraeuywtdt/Build/Products/Debug-iphonesimulator -F/Users/Ehtesham/Library/Developer/Xcode/DerivedData/AddressBookGoogleMaps-hbtfxxvykazaogbfqnnraeuywtdt/Build/Products/Debug-iphonesimulator -F/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics -F/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth -F/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Database -F/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn -filelist /Users/Ehtesham/Library/Developer/Xcode/DerivedData/AddressBookGoogleMaps-hbtfxxvykazaogbfqnnraeuywtdt/Build/Intermediates/AddressBookGoogleMaps.build/Debug-iphonesimulator/AddressBookGoogleMaps.build/Objects-normal/x86_64/AddressBookGoogleMaps.LinkFileList -Xlinker -rpath -Xlinker @executable_path/Frameworks -mios-simulator-version-min=8.0 -dead_strip -Xlinker -object_path_lto -Xlinker /Users/Ehtesham/Library/Developer/Xcode/DerivedData/AddressBookGoogleMaps-hbtfxxvykazaogbfqnnraeuywtdt/Build/Intermediates/AddressBookGoogleMaps.build/Debug-iphonesimulator/AddressBookGoogleMaps.build/Objects-normal/x86_64/AddressBookGoogleMaps_lto.o -Xlinker -export_dynamic -Xlinker -no_deduplicate -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -ObjC -Xlinker -sectcreate -Xlinker __TEXT -Xlinker __entitlements -Xlinker /Users/Ehtesham/Library/Developer/Xcode/DerivedData/AddressBookGoogleMaps-hbtfxxvykazaogbfqnnraeuywtdt/Build/Intermediates/AddressBookGoogleMaps.build/Debug-iphonesimulator/AddressBookGoogleMaps.build/AddressBookGoogleMaps.app.xcent -framework GoogleToolboxForMac -framework FirebaseAuth -framework FirebaseAnalytics -framework GoogleSignInDependencies -framework SystemConfiguration -framework GoogleAppUtilities -framework GTMSessionFetcher -framework FirebaseCore -framework GoogleSignIn -framework SafariServices -framework GoogleSymbolUtilities -framework Accelerate -framework GoogleSymbolUtilities -framework GoogleInterchangeUtilities -framework FirebaseDatabase -framework FirebaseInstanceID -Xlinker -dependency_info -Xlinker /Users/Ehtesham/Library/Developer/Xcode/DerivedData/AddressBookGoogleMaps-hbtfxxvykazaogbfqnnraeuywtdt/Build/Intermediates/AddressBookGoogleMaps.build/Debug-iphonesimulator/AddressBookGoogleMaps.build/Objects-normal/x86_64/AddressBookGoogleMaps_dependency_info.dat -o /Users/Ehtesham/Library/Developer/Xcode/DerivedData/AddressBookGoogleMaps-hbtfxxvykazaogbfqnnraeuywtdt/Build/Products/Debug-iphonesimulator/AddressBookGoogleMaps.app/AddressBookGoogleMaps
duplicate symbol _OBJC_CLASS_$_GTMLogStandardFormatter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_METACLASS_$_GTMLogStandardFormatter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_CLASS_$_GTMLogBasicFormatter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_METACLASS_$_GTMLogBasicFormatter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_CLASS_$_GTMLogNoFilter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_METACLASS_$_GTMLogNoFilter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_CLASS_$_GTMLogMininumLevelFilter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_METACLASS_$_GTMLogMininumLevelFilter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_CLASS_$_GTMLogMaximumLevelFilter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_METACLASS_$_GTMLogMaximumLevelFilter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_CLASS_$_GTMLogLevelFilter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_METACLASS_$_GTMLogLevelFilter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
duplicate symbol _OBJC_CLASS_$_GTMLogAllowedLevelFilter in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o)
........................................
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duplicate symbol _OBJC_IVAR_$_GTMSessionFetcherService._cookieStorageMethod in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcherService_c6b7326897506dd1305d6961fdc1ec8b.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionFetcherService_c6b7326897506dd1305d6961fdc1ec8b.o)
duplicate symbol _OBJC_IVAR_$_GTMSessionFetcherService._retryEnabled in:
/Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcherService_c6b7326897506dd1305d6961fdc1ec8b.o)
/Projects/iOS/AddressBookGoogleMaps/AddressBookG
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