MGTwitterEngine抛出错误：G ++ - 4.2失败，退出代码1

Question

我在我的iPhone应用程序安装MGTwitterEngine，并遵循所有的说明，现在我得到以下错误：

Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.2 failed with exit code 1 

完整的错误文本为：

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 

任何想法可能导致它？

Answer 1

链接发现重复的符号EstimateBas64DecodedDataSize功能，因为在你的项目，你正在试图对静态库libOAuth.a和Base64Transcoder.o这是从源头上建立链接。它们都包含这个符号，链接器不知道应该选择哪一个。在一般情况下很难说明如何解决这个问题，但基本上你必须确保这个符号是由链接器输入中的一个文件导出的。

你从哪里得到这个MGTwitterEngine发行版？用实际的代码解决这个问题会容易得多。