我在我的iPhone应用程序中安装了MGTwitterEngine，并按照所有说明操作，现在我收到以下错误：
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.2 failed with exit code 1
完整的错误文字是：
Ld /Users/jason/Documents/iPad/build/Debug-iphonesimulator/FlashCards.app/FlashCards normal i386
cd /Users/jason/Documents/iPad/FlashCards
setenv MACOSX_DEPLOYMENT_TARGET 10.6
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk -L/Users/jason/Documents/iPad/build/Debug-iphonesimulator -L/Users/jason/Documents/iPad/FlashCards/Classes -L/Users/jason/Documents/iPad/FlashCards/Classes/SAOAuthTwitterEngine -L/Users/jason/Documents/iPad/FlashCards/Classes -L/Users/jason/Documents/iPad/FlashCards/Classes/Simulator4 -F/Users/jason/Documents/iPad/build/Debug-iphonesimulator -filelist /Users/jason/Documents/iPad/build/FlashCards.build/Debug-iphonesimulator/FlashCards++.build/Objects-normal/i386/FlashCards.LinkFileList -mmacosx-version-min=10.6 -l teEngine -ObjC -all_load -Xlinker -objc_abi_version -Xlinker 2 /Users/jason/Documents/iPad/core-plot/build/Debug-iphonesimulator/libCorePlot-CocoaTouch.a -framework Foundation -framework UIKit -framework CoreGraphics -framework CoreData -licucore.A -framework QuartzCore -framework SystemConfiguration -framework Security -framework MessageUI -framework CFNetwork -framework AddressBook -framework AddressBookUI -framework AudioToolbox -lteEngine -lteEngine -lOAuth -lxml2.2.7.3 -o /Users/jason/Documents/iPad/build/Debug-iphonesimulator/FlashCards.app/FlashCards
ld: duplicate symbol _EstimateBas64DecodedDataSize in /Users/jason/Documents/iPad/FlashCards/Classes/SAOAuthTwitterEngine/libOAuth.a(Base64Transcoder.o) and /Users/jason/Documents/iPad/build/FlashCards.build/Debug-iphonesimulator/FlashCards++.build/Objects-normal/i386/Base64Transcoder.o
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.2 failed with exit code 1
知道可能导致它的原因吗？
答案 0 :(得分：2)
链接器找到EstimateBas64DecodedDataSize函数的重复符号，因为在您的项目中，您尝试链接从源构建的静态库libOAuth.a和Base64Transcoder.o。它们都包含此符号，链接器不知道它应该选择哪一个。在一般情况下，很难说如何解决此问题，但基本上您必须确保此符号仅由链接器输入中的一个文件导出。
您从哪里获得此MGTwitterEngine发行版？用实际代码解决这个问题要容易得多。