问题描述
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错误结果：
生成14条警告。
===具有配置调试功能的项目运行器的构建目标运行器===
体系结构arm64的未定义符号：
“ OBJC_CLASS $ _ GULHeartbeatDateStorage”，引用自：
objc-class-ref in FirebaseCore(FIRHeartbeatInfo.o)
“ OBJC_CLASS $ _ GULKeychainUtils”，引用自：
objc-class-ref in FirebaseInstallations(FIRInstallationsIIDTokenStore.o)
“ OBJC_CLASS $ _ GADExtras”，引用自：
objc-class-ref in firebase_admob(FLTRequestFactory.o)
“ OBJC_CLASS $ _ GADRequest”，引用自：
objc-class-ref in firebase_admob(FLTRequestFactory.o)
“ _ GULLogBasic”，引用自：
_FIRLogBasic in FirebaseCore(FIRLogger.o)
“ _ GULResetLogger”，引用自：
_FIRResetLogger in FirebaseCore(FIRLogger.o)
“ _ GULLoggerRegisterVersion”，引用自：
___FIRLoggerInitializeASL_block_invoke in FirebaseCore(FIRLogger.o)
“ _ GULLoggerInitializeASL”，引用自：
___FIRLoggerInitializeASL_block_invoke in FirebaseCore(FIRLogger.o)
“ _ GULLoggerForceDebug”，引用自：
___FIRLoggerInitializeASL_block_invoke in FirebaseCore(FIRLogger.o)
“ _ GULSetLoggerLevel”，引用自：
_FirsetLoggerLevel in FirebaseCore(FIRLogger.o)
“ OBJC_CLASS $ _ GULKeychainStorage”，引用自：
objc-class-ref in FirebaseInstallations(FIRInstallationsIDController.o)
“ OBJC_CLASS $ _ FBNativeBannerAdView”，引用自：
objc-class-ref in facebook_audience_network(FacebookAudienceNetworkNativeBannerAd.o)
“ OBJC_CLASS $ _ FBNativeBannerAd”，引用自：
objc-class-ref in facebook_audience_network(FacebookAudienceNetworkNativeBannerAd.o)
“ OBJC_CLASS $ _ GADMobileAds”，引用自：
objc-class-ref in firebase_admob(FLTMobileAd.o)
“ OBJC_CLASS $ _ FBAdIconView”，引用自：
objc-class-ref in facebook_audience_network(FacebookAudienceNetworkNativeAd.o)
“ OBJC_CLASS $ _ GULSecureCoding”，引用自：
objc-class-ref in FirebaseMessaging(FIRMessagingPubSub.o)
“ OBJC_CLASS $ _ FBNativeAd”，引用自：
objc-class-ref in facebook_audience_network(FacebookAudienceNetworkNativeAd.o)
“ OBJC_CLASS $ _ FBAdView”，引用自：
objc-class-ref in facebook_audience_network(FacebookAudienceNetworkBannerAd.o)
“ _ kGADAdSizeSmartBannerLandscape”，引用自：
-[FLTFirebaseAdMobPlugin callLoadBannerAdWithId:channel:call:result:] in firebase_admob(FLTFirebaseAdMobPlugin.o)
“ OBJC_CLASS $ _ GADInterstitial”，引用自：
objc-class-ref in firebase_admob(FLTMobileAd.o)
“ OBJC_CLASS $ _ GADRewardBasedVideoAd”，引用自：
objc-class-ref in firebase_admob(FLTrewardedvideoadWrapper.o)
“ OBJC_CLASS $ _ FBAdOptionsView”，引用自：
objc-class-ref in facebook_audience_network(FacebookAudienceNetworkNativeAd.o)
“ OBJC_CLASS $ _ GULAppDelegateSwizzler”，引用自：
objc-class-ref in FirebaseMessaging(FIRMessaging.o)
objc-class-ref in FirebaseMessaging(FIRMessagingAnalytics.o)
objc-class-ref in FirebaseMessaging(FIRMessagingContextManagerService.o)
objc-class-ref in FirebaseMessaging(FIRMessagingRemoteNotificationsproxy.o)
“ OBJC_CLASS $ _ FBNativeAdViewAttributes”，引用自：
objc-class-ref in facebook_audience_network(FacebookAudienceNetworkNativeAd.o)
“ _ GULLoggerEnableSTDERR”，引用自：
___FIRLoggerInitializeASL_block_invoke in FirebaseCore(FIRLogger.o)
“ OBJC_CLASS $ _ GADBannerView”，引用自：
objc-class-ref in firebase_admob(FLTMobileAd.o)
“ OBJC_CLASS $ _ FBNativeAdView”，引用自：
objc-class-ref in facebook_audience_network(FacebookAudienceNetworkNativeAd.o)
“ _ GADAdSizefromCGSize”，引用自：
-[FLTFirebaseAdMobPlugin callLoadBannerAdWithId:channel:call:result:] in firebase_admob(FLTFirebaseAdMobPlugin.o)
“ OBJC_CLASS $ _ GULUserDefaults”，引用自：
objc-class-ref in FirebaseInstanceID(FIRInstanceID.o)
objc-class-ref in FirebaseMessaging(FIRMessaging.o)
objc-class-ref in FirebaseInstanceID(FIRInstanceIDUtilities.o)
objc-class-ref in FirebaseMessaging(FIRMessagingPubSub.o)
objc-class-ref in FirebaseInstallations(FIRInstallationsstore.o)
objc-class-ref in FirebaseInstanceID(FIRInstanceIDCheckinPreferences.o)
“ OBJC_CLASS $ _ GADAdLoader”，引用自：
objc-class-ref in firebase_admob(FLTMobileAd.o)
“ OBJC_CLASS $ _ GULAppEnvironmentUtil”，引用自：
objc-class-ref in FirebaseCore(FIRApp.o)
objc-class-ref in FirebaseInstanceID(FIRInstanceID.o)
objc-class-ref in FirebaseCore(FIRBundleUtil.o)
“ _ kGADAdLoaderAdTypeUnifiednative”，引用自：
-[FLTNativeAd loadWithAdUnitId:targetingInfo:] in firebase_admob(FLTMobileAd.o)
“ _ GULIsLoggableLevel”，引用自：
_FIRIsLoggableLevel in FirebaseCore(FIRLogger.o)
“ OBJC_CLASS $ _ GULReachabilityChecker”，引用自：
objc-class-ref in FirebaseMessaging(FIRMessaging.o)
“ OBJC_CLASS $ _ FBInterstitialAd”，引用自：
objc-class-ref in facebook_audience_network(FacebookAudienceNetworkInterstitialAd.o)
“ OBJC_CLASS $ _ FBMediaView”，引用自：
objc-class-ref in facebook_audience_network(FacebookAudienceNetworkNativeAd.o)
“ _ kGADAdSizeSmartBannerPortrait”，引用自：
-[FLTFirebaseAdMobPlugin callLoadBannerAdWithId:channel:call:result:] in firebase_admob(FLTFirebaseAdMobPlugin.o)
ld：体系结构arm64找不到符号
解决方法
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