在没有Cocoapods的情况下手动集成Firebase和Google Sign In SDK时重复的符号

在我现有的iOS项目中手动集成Firebase和Google Sign In SDK时，出现重复符号错误。

这里的相关SO问题没有帮助，因为它使用Cocoapods。

Firebase和Google Signin给出了重复的符号错误

我按时间顺序采取的步骤：

  1. 从下载的Firebase SDK（3.11.0）复制Analytics，Auth和Database文件夹以及Firebase.h文件到我的项目中并添加到目标中。

  2. 将GoogleService-Info.plist复制到项目中并添加到目标。

  3. 向其他链接器标志添加了-ObjC标志。

  4. 将下载的Google Sign In SDK（4.0.1）中的必要框架和软件包复制到我的项目中，并添加到目标中。

  5. 链接必要的框架和库。

这里是相关的项目结构： 

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)

这里是错误日志（截断）： 

 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_$_GTMLogAllowedLevelFilter in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Analytics/GoogleToolboxForMac.framework/GoogleToolboxForMac(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMLogger_e66760ac68814bab22c3e6b0850da5e6.o) ........................................ ........................................ duplicate symbol _OBJC_IVAR_$_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_$_GTMSessionFetcherService._retryEnabled in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionFetcherService_c6b7326897506dd1305d6961fdc1ec8b.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionFetcherService_c6b7326897506dd1305d6961fdc1ec8b.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadGranularity in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._shouldInitiateOffsetQuery in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._lastChunkRequest in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._initialBodySent in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._fetcherInFlight in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._currentOffset in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._useBackgroundSessionOnChunkFetchers in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._recentChunkReponseHeaders in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._delegateCompletionHandler in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._chunkFetcher in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_CLASS_$_GTMSessionUploadFetcher in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_METACLASS_$_GTMSessionUploadFetcher in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadDataProvider in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _kGTMSessionFetcherUploadLocationObtainedNotification in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._initialBodyLength in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadFileLength in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._subdataGenerating in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._isSubdataGenerating in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _kGTMSessionUploadFetcherMaximumDemandBufferSize in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._chunkSize in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _kGTMSessionUploadFetcherStandardChunkSize in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._delegateCallbackQueue in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadMIMEType in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadFileHandle in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._recentChunkStatusCode in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._isPaused in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._isRestartedUpload in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadData in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadLocationURL in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) duplicate symbol _OBJC_IVAR_$_GTMSessionUploadFetcher._uploadFileURL in: /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/GoogleSignIn/GoogleSignInDependencies.framework/GoogleSignInDependencies(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) /Projects/iOS/AddressBookGoogleMaps/AddressBookGoogleMaps/Sources/Externals/Firebase/Auth/GTMSessionFetcher.framework/GTMSessionFetcher(GTMSessionUploadFetcher_fb894b20da0d1114d3ddd8f56ed741c5.o) ld: 194 duplicate symbols for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

虽然离理想的解决scheme还很远，但我仍然是这样解决的。

（这个解决scheme可以应用于两个静态库导致“重复符号”错误的任何情况，因为这两个库都包含公共类并使用-all_load或-all_load标志。）

将GoogleSignInDependencies.framework内的GoogleSignInDependencies文件复制到单独的位置PATH中。 这个文件是一个胖文件，这意味着它有不同的体系结构代码。

打开terminal并转到PATH。 

 $ cd PATH

运行以下命令获取有关胖库的信息。 

 $ lipo -info GoogleSignInDependencies

你会得到以下结果。 

 Architectures in the fat file: GoogleSignInDependencies are: armv7 i386 x86_64 arm64

正如你所看到的，fat文件中有4个体系结构。

通过运行以下命令从胖文件获取精简文件（仅包含一个体系结构代码的文件）。 

 $ 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

您将得到4个名为armv7.a，i386.a，x86_64.a和arm64.a的瘦文件。

删除GoogleSignInDependencies文件，我们不再需要它了。

创build4个名为armv7，i386，x86_64和arm64的新文件夹。 然后将瘦文件armv7.a，i386.a，x86_64.a和arm64.a移动到相应的文件夹中。 你应该有如下的文件夹结构。 

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

从terminal转到4个文件夹中的每一个，使用以下命令从精简文件中提取目标文件（* .o）。 

 $ 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

运行这些命令后，4个文件夹中的每一个都应包含以下文件。 （这可以在将来的版本中改变。） 

 __.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

从4个文件夹中删除与Firebase库冲突的文件。 您需要删除这6个文件。 （这可以在将来的版本中改变。） 

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

删除瘦文件armv7.a，i386.a，x86_64.a和arm64.a。

通过运行以下命令将剩余的目标文件合并到精简文件中。 

 $ 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

将新创build的瘦文件armv7-new.a，i386-new.a，x86_64-new.a和arm64-new.a复制到新的位置PATH_NEW。 你可以删除PATH里面的所有内容。

通过运行以下命令将新的瘦文件合并到一个新的胖文件中。 

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

在您的Xcode项目中使用新生成的GoogleSignInDependencies-new代替GoogleSignInDependencies。

我强烈build议下面的文章，以深入了解的事情。

http://atnan.com/blog/2012/01/12/avoiding-duplicate-symbol-errors-during-linking-by-removing-classes-from-static-libraries

如果你有这个问题，我刚刚写了一个bash shell脚本，它为我做了所有的工作。 我已经把它保存为一个主旨 。 需要您自担风险使用它。

真正的问题是， 你为什么直接复制而不是使用cocoapods？ 使用你的方法确实没有什么好处。 如果你使用cocoapods你不会有这个问题。 如果我是你，我会删除这些文件，并与cocoapods安装。 当你安装cocoapods时，错误的可能性要小得多

    Interesting Posts

    Firebase在创build新用户时会注销当前用户

    从匿名数据库中删除匿名用户

    如何在Swift中的iOS上使用FirebaseUI进行Google身份validation？

    如何在Firebase IOS中正确链接不同的Auth帐户

    如何防止用户名在Firebase中重复注册？

    如何使用Firebase创build好友列表？

    自定义Firebase数据服务类：Swift 3

    如何让应用程序等待Firebase请求完成

    在Firebase SDK v3中使用数据库秘密进行身份validation？

    确保在Firebase中创build新用户的唯一用户名（Swift）