在Yosemite,Xcode 6.1下Swift编程Undefined symbols for architecture arm64报错解决

接收同事一个未做完的项目，checkout下来后编译（直接跑的workSpace文件），出现奇怪的某些库不支持64位架构的链接错误，一直以为是该库不支持64位架构，但是取消该库关联后仍然出现其他库也不支持64位架构的情况，但是在我印象中那些库都是支持的，遂感觉非常奇怪。例如下面显示的谷歌分析库不支持64位架构。

Undefined symbols for architecture arm64:  "_sqlite3_close", referenced from:      -[TAGDataLayerPersistentStoreImpl closeDatabase] in libGoogleAnalyticsServices.a(TAGDataLayerPersistentStoreImpl.o)  "_sqlite3_prepare_v2", referenced from:      -[TAGDataLayerPersistentStoreImpl prepareSql:description:] in libGoogleAnalyticsServices.a(TAGDataLayerPersistentStoreImpl.o)  "_sqlite3_bind_int", referenced from:      -[TAGDataLayerPersistentStoreImpl deleteEntries:] in libGoogleAnalyticsServices.a(TAGDataLayerPersistentStoreImpl.o)  "_sqlite3_column_int64", referenced from:      -[TAGDataLayerPersistentStoreImpl peekEntryIds:] in libGoogleAnalyticsServices.a(TAGDataLayerPersistentStoreImpl.o)      -[TAGDataLayerPersistentStoreImpl numStoredEntries] in libGoogleAnalyticsServices.a(TAGDataLayerPersistentStoreImpl.o)  "_sqlite3_bind_int64", referenced from:      -[TAGDataLayerPersistentStoreImpl writeEntriesToDatabase:expireTime:] in libGoogleAnalyticsServices.a(TAGDataLayerPersistentStoreImpl.o)      -[TAGDataLayerPersistentStoreImpl peekEntryIds:] in libGoogleAnalyticsServices.a(TAGDataLayerPersistentStoreImpl.o)      -[TAGDataLayerPersistentStoreImpl deleteEntriesOlderThan:] in libGoogleAnalyticsServices.a(TAGDataLayerPersistentStoreImpl.o)  "_sqlite3_column_bytes", referenced from:      -[TAGDataLayerPersistentStoreImpl loadSerialized] in libGoogleAnalyticsServices.a(TAGDataLayerPersistentStoreImpl.o)  "_sqlite3_open", referenced from:      -[TAGDataLayerPersistentStoreImpl openDatabaseAndInitStatements] in libGoogleAnalyticsServices.a(TAGDataLayerPersistentStoreImpl.o)  "_sqlite3_reset", referenced from:

上stackover查找原因（百度太弱了，还是老外强大），很多都说可能是cocoapods不是最新啊，好，那就更新到最新，还是不行；有些说需要卸载cocoapods然后重新装一次，还是不行啊；那就从源头开始试试，既然不支持64位，那我就update最新的谷歌分析库吧，在profile文件中将 谷歌分析部分改成   pod 'GoogleAnalytics-iOS-SDK'   默认拉取最新的库，编译。。。该错误再次出现，抓狂中，，，没办法了，继续stackover，终于找到了有类似遭遇的，，哈哈～遂试试看，没有链接错误了，，，但是蹦出新错误，，，

Code Sign error: No matching provisioning profiles found: None of the valid provisioning profiles allowed the specified entitlements: com.apple.security.application-groups.，ok，这种错误一看就知道是账号问题啦，由于使用了App Extesion 功能，那么取消App Groups 关联，重新关联一下，编译通过。

原版回答：

I have Updated on Yosemite, Xcode 6.1. I have updated gem xcodeproj (0.19.4) and cocoapods (0.34.4).

I have resolve my conflict by :

Clearing the Library/Developer/Xcode/DerivedData folder

replace in Target -> Build Settings -> Linking -> Other Linker Flags : $(OTHER_LDFLAGS)

Check in Target -> Build Phases -> Copy Pods Resources : "${SRCROOT}/Pods/Target Support Files/Pods/Pods-resources.sh"

另：老外还给出了xcode 编译swift 程序流程，mark一下～

参见地址：http://stackoverflow.com/questions/25765352/xcode-6-linker-error-undefined-symbols-for-architecture-armv7