本文介绍了带有Unity的FireBase在XCode中导致链接器错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已使用Firebase Messaging.unitypackage将Firebase添加到我的Unity项目中。
当我为Android构建并运行时，它可以工作，但当我尝试为iOS构建时，我在XCode中收到以下错误：
Ld /Users/one4freedk/Library/Developer/Xcode/DerivedData/Unity-iPhone-eijzxgpugrgbhsfkgmdnrbljevok/Build/Products/Debug-iphoneos/one4freeapp.app/one4freeapp normal armv7
cd /Users/one4freedk/Desktop/One4Free/One4Free/iosbuild
export IPHONEOS_DEPLOYMENT_TARGET=7.0
export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.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 armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS10.2.sdk -L/Users/one4freedk/Library/Developer/Xcode/DerivedData/Unity-iPhone-eijzxgpugrgbhsfkgmdnrbljevok/Build/Products/Debug-iphoneos -L/Users/one4freedk/Desktop/One4Free/One4Free/iosbuild -L/Users/one4freedk/Desktop/One4Free/One4Free/iosbuild/Libraries -F/Users/one4freedk/Library/Developer/Xcode/DerivedData/Unity-iPhone-eijzxgpugrgbhsfkgmdnrbljevok/Build/Products/Debug-iphoneos -F/Users/one4freedk/Desktop/One4Free/One4Free/iosbuild/Frameworks/FacebookSDK/Plugins/iOS -F/Users/one4freedk/Desktop/One4Free/One4Free/iosbuild/Frameworks -filelist /Users/one4freedk/Library/Developer/Xcode/DerivedData/Unity-iPhone-eijzxgpugrgbhsfkgmdnrbljevok/Build/Intermediates/Unity-iPhone.build/Debug-iphoneos/Unity-iPhone.build/Objects-normal/armv7/one4freeapp.LinkFileList -Xlinker -map -Xlinker /Users/one4freedk/Library/Developer/Xcode/DerivedData/Unity-iPhone-eijzxgpugrgbhsfkgmdnrbljevok/Build/Intermediates/Unity-iPhone.build/Debug-iphoneos/Unity-iPhone.build/one4freeapp-LinkMap-normal-armv7.txt -miphoneos-version-min=7.0 -dead_strip -Xlinker -object_path_lto -Xlinker /Users/one4freedk/Library/Developer/Xcode/DerivedData/Unity-iPhone-eijzxgpugrgbhsfkgmdnrbljevok/Build/Intermediates/Unity-iPhone.build/Debug-iphoneos/Unity-iPhone.build/Objects-normal/armv7/one4freeapp_lto.o -Xlinker -no_deduplicate -fembed-bitcode-marker -stdlib=libc++ -fobjc-arc -fobjc-link-runtime -weak_framework CoreMotion -weak-lSystem -ObjC -lc++ -lsqlite3 -lz -licucore -lc++ -liPhone-lib -framework CoreText -framework AudioToolbox -weak_framework AVFoundation -framework CFNetwork -framework CoreGraphics -framework CoreLocation -framework CoreMedia -weak_framework CoreMotion -framework CoreVideo -framework Foundation -framework MediaPlayer -framework OpenAL -framework OpenGLES -framework QuartzCore -framework SystemConfiguration -framework UIKit -liconv.2 -framework Bolts -framework FBSDKShareKit -framework FBSDKCoreKit -framework FBSDKLoginKit -weak_framework Metal -framework FirebaseAnalytics -framework FirebaseCore -framework FirebaseInstanceID -framework FirebaseMessaging -framework GoogleInterchangeUtilities -framework GoogleSymbolUtilities -framework StoreKit -framework AddressBook -Xlinker -dependency_info -Xlinker /Users/one4freedk/Library/Developer/Xcode/DerivedData/Unity-iPhone-eijzxgpugrgbhsfkgmdnrbljevok/Build/Intermediates/Unity-iPhone.build/Debug-iphoneos/Unity-iPhone.build/Objects-normal/armv7/one4freeapp_dependency_info.dat -o /Users/one4freedk/Library/Developer/Xcode/DerivedData/Unity-iPhone-eijzxgpugrgbhsfkgmdnrbljevok/Build/Products/Debug-iphoneos/one4freeapp.app/one4freeapp
Undefined symbols for architecture armv7:
"_SWIGRegisterExceptionCallbacksArgument_FirebaseMessaging", referenced from:
_SWIGExceptionHelper_SWIGRegisterExceptionCallbacksArgument_FirebaseMessaging_m2946342211 in Bulk_Firebase.Messaging_0.o
(maybe you meant: _SWIGExceptionHelper_SWIGRegisterExceptionCallbacksArgument_FirebaseMessaging_m2946342211)
"_SWIGRegisterStringCallback_FirebaseMessaging", referenced from:
_SWIGStringHelper_SWIGRegisterStringCallback_FirebaseMessaging_m1829604336 in Bulk_Firebase.Messaging_0.o
(maybe you meant: _SWIGStringHelper_SWIGRegisterStringCallback_FirebaseMessaging_m1829604336)
"_Firebase_Messaging_SendPendingEvents", referenced from:
_FirebaseMessagingPINVOKE_Firebase_Messaging_SendPendingEvents_m696476573 in Bulk_Firebase.Messaging_0.o
(maybe you meant: _FirebaseMessagingPINVOKE_Firebase_Messaging_SendPendingEvents_m696476573)
"_Firebase_Messaging_SetListenerCallbacksEnabled", referenced from:
_FirebaseMessagingPINVOKE_Firebase_Messaging_SetListenerCallbacksEnabled_m633290538 in Bulk_Firebase.Messaging_0.o
(maybe you meant: _FirebaseMessagingPINVOKE_Firebase_Messaging_SetListenerCallbacksEnabled_m633290538)
"_Firebase_Messaging_SetListenerCallbacks", referenced from:
_FirebaseMessagingPINVOKE_Firebase_Messaging_SetListenerCallbacks_m2687428259 in Bulk_Firebase.Messaging_0.o
(maybe you meant: _FirebaseMessagingPINVOKE_Firebase_Messaging_SetListenerCallbacks_m2687428259, _FirebaseMessagingPINVOKE_Firebase_Messaging_SetListenerCallbacksEnabled_m633290538 )
"_Firebase_Messaging_FirebaseMessage_From_get", referenced from:
_FirebaseMessagingPINVOKE_Firebase_Messaging_FirebaseMessage_From_get_m3347431359 in Bulk_Firebase.Messaging_0.o
(maybe you meant: _FirebaseMessagingPINVOKE_Firebase_Messaging_FirebaseMessage_From_get_m3347431359)
"_Firebase_Messaging_delete_FirebaseMessage", referenced from:
_FirebaseMessagingPINVOKE_Firebase_Messaging_delete_FirebaseMessage_m1658331736 in Bulk_Firebase.Messaging_0.o
(maybe you meant: _FirebaseMessagingPINVOKE_Firebase_Messaging_delete_FirebaseMessage_m1658331736)
"_SWIGRegisterExceptionCallbacks_FirebaseMessaging", referenced from:
_SWIGExceptionHelper_SWIGRegisterExceptionCallbacks_FirebaseMessaging_m2350026019 in Bulk_Firebase.Messaging_0.o
(maybe you meant: _SWIGExceptionHelper_SWIGRegisterExceptionCallbacks_FirebaseMessaging_m2350026019)
"_Firebase_App_FirebaseApp_CreateInternal__SWIG_0", referenced from:
_AppUtilPINVOKE_Firebase_App_FirebaseApp_CreateInternal__SWIG_0_m2787922779 in Bulk_Firebase.App_0.o
(maybe you meant: _AppUtilPINVOKE_Firebase_App_FirebaseApp_CreateInternal__SWIG_0_m2787922779)
"_SWIGRegisterExceptionCallbacksArgument_AppUtil", referenced from:
_SWIGExceptionHelper_SWIGRegisterExceptionCallbacksArgument_AppUtil_m386473544 in Bulk_Firebase.App_0.o
(maybe you meant: _SWIGExceptionHelper_SWIGRegisterExceptionCallbacksArgument_AppUtil_m386473544)
"_Firebase_App_FirebaseApp_Name_get", referenced from:
_AppUtilPINVOKE_Firebase_App_FirebaseApp_Name_get_m2545680430 in Bulk_Firebase.App_0.o
(maybe you meant: _AppUtilPINVOKE_Firebase_App_FirebaseApp_Name_get_m2545680430)
"_Firebase_App_SetLogFunction", referenced from:
_AppUtilPINVOKE_Firebase_App_SetLogFunction_m3733654825 in Bulk_Firebase.App_0.o
(maybe you meant: _AppUtilPINVOKE_Firebase_App_SetLogFunction_m3733654825)
"_SWIGRegisterStringCallback_AppUtil", referenced from:
_SWIGStringHelper_SWIGRegisterStringCallback_AppUtil_m4196108411 in Bulk_Firebase.App_0.o
(maybe you meant: _SWIGStringHelper_SWIGRegisterStringCallback_AppUtil_m4196108411)
"_Firebase_App_SetEnabledAllAppCallbacks", referenced from:
_AppUtilPINVOKE_Firebase_App_SetEnabledAllAppCallbacks_m3339389901 in Bulk_Firebase.App_0.o
(maybe you meant: _AppUtilPINVOKE_Firebase_App_SetEnabledAllAppCallbacks_m3339389901)
"_Firebase_App_delete_FirebaseApp", referenced from:
_AppUtilPINVOKE_Firebase_App_delete_FirebaseApp_m1137114670 in Bulk_Firebase.App_0.o
(maybe you meant: _AppUtilPINVOKE_Firebase_App_delete_FirebaseApp_m1137114670)
"_Firebase_App_FirebaseApp_DefaultName_get", referenced from:
_AppUtilPINVOKE_Firebase_App_FirebaseApp_DefaultName_get_m4097276820 in Bulk_Firebase.App_0.o
(maybe you meant: _AppUtilPINVOKE_Firebase_App_FirebaseApp_DefaultName_get_m4097276820)
"_Firebase_App_AppEnableLogCallback", referenced from:
_AppUtilPINVOKE_Firebase_App_AppEnableLogCallback_m3057939313 in Bulk_Firebase.App_0.o
(maybe you meant: _AppUtilPINVOKE_Firebase_App_AppEnableLogCallback_m3057939313)
"_SWIGRegisterExceptionCallbacks_AppUtil", referenced from:
_SWIGExceptionHelper_SWIGRegisterExceptionCallbacks_AppUtil_m1809271624 in Bulk_Firebase.App_0.o
(maybe you meant: _SWIGExceptionHelper_SWIGRegisterExceptionCallbacks_AppUtil_m1809271624)
"_Firebase_App_PollCallbacks", referenced from:
_AppUtilPINVOKE_Firebase_App_PollCallbacks_m784944262 in Bulk_Firebase.App_0.o
(maybe you meant: _AppUtilPINVOKE_Firebase_App_PollCallbacks_m784944262)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
我一直在寻找解决方案，但到目前为止还没有找到。我试过禁用Bitcode，只为一个架构构建，编辑链接器标志，检查库搜索路径，但没有任何成功。
目前，此错误使我无法为iOS生成项目。
我运行的是Unity 5.5.0f3、XCode8.2和Firebase 1.1.0
推荐答案
我刚刚找出问题出在哪里。我目前的设置包括在我的Windows机器上处理项目，然后使用Mac进行构建。我发现我使用的版本控制软件(TortoiseSVN)没有自动包含".a"文件，这导致libApp.a和libMessaging.a无法传输到Mac。
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