MGTwitterEngine 抛出错误：g++-4.2 失败，退出代码 1
我在 iPhone 应用程序中安装了 MGTwitterEngine，并按照所有说明进行操作，现在出现以下错误：
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
知道是什么原因造成的吗？
I installed MGTwitterEngine in my iPhone app, and followed all the instructions, and now I get the following error:
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.2 failed with exit code 1
The full error text is:
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
Any idea what could be causing it?
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链接器发现
EstimateBas64DecodedDataSize函数存在重复符号，因为在您的项目中，您尝试链接静态库libOAuth.a和Base64Transcoder.o从源头构建。它们都包含此符号，并且链接器不知道应该选择哪一个。在一般情况下很难说如何解决这个问题，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。您从哪里获得这个 MGTwitterEngine 发行版？用实际代码解决这个问题会容易得多。
Linker found a duplicate symbols for
EstimateBas64DecodedDataSizefunction because in you project you are trying to link against static librarylibOAuth.aandBase64Transcoder.owhich was built from the sources. Both of them contains this symbol and linker doesn't know which one it should pick. It's hard to tell how to resolve this issue in general case, but basically you have to make sure that this symbol is exported by exactly one file from linker's input.Where did you get this MGTwitterEngine distribution? It will be much easier to solve this issue with actual code.