iOS4.1 SDK中单个库中的重复符号

Question

我正在开发一个iPhone应用程序.我对Xcode不熟悉,所以请耐心等待.我有iOS 4.1 Device SDK.当我在"Active ..."下拉框中选择"Simulator"时,我的应用程序编译没有错误并在iPhone模拟器中运行.

但是,当我在下拉框中选择"设备"时,我收到有关重复符号的以下链接器错误:

Ld build/PineCone.build/Debug-iphoneos/PineCone.build/Objects-normal/armv6/PineCone normal armv6
cd /Users/isaacsutherland/fydp/PineCone/PineCone
setenv IPHONEOS_DEPLOYMENT_TARGET 4.1
setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.1.sdk -L/Users/isaacsutherland/fydp/PineCone/PineCone/build/Debug-iphoneos -L/Users/isaacsutherland/fydp/PineCone/PineCone/../3rd/libGHUnitIPhone -F/Users/isaacsutherland/fydp/PineCone/PineCone/build/Debug-iphoneos -filelist /Users/isaacsutherland/fydp/PineCone/PineCone/build/PineCone.build/Debug-iphoneos/PineCone.build/Objects-normal/armv6/PineCone.LinkFileList -dead_strip -all_load -ObjC -miphoneos-version-min=4.1 -framework Foundation -framework UIKit -framework CoreGraphics /Users/isaacsutherland/fydp/PineCone/3rd/three20/Build/Products/Debug-iphoneos/libThree20.a /Users/isaacsutherland/fydp/PineCone/3rd/three20/Build/Products/Debug-iphoneos/libThree20Core.a /Users/isaacsutherland/fydp/PineCone/3rd/three20/Build/Products/Debug-iphoneos/libThree20Network.a /Users/isaacsutherland/fydp/PineCone/3rd/three20/Build/Products/Debug-iphoneos/libThree20Style.a /Users/isaacsutherland/fydp/PineCone/3rd/three20/Build/Products/Debug-iphoneos/libThree20UI.a /Users/isaacsutherland/fydp/PineCone/3rd/three20/Build/Products/Debug-iphoneos/libThree20UICommon.a /Users/isaacsutherland/fydp/PineCone/3rd/three20/Build/Products/Debug-iphoneos/libThree20UINavigator.a -framework QuartzCore -framework CFNetwork -framework MobileCoreServices -framework SystemConfiguration -lz.1.2.3 /Users/isaacsutherland/fydp/PineCone/ClientDal/build/Debug-iphoneos/libClientDal.a -lGHUnitIPhone4_0 -o /Users/isaacsutherland/fydp/PineCone/PineCone/build/PineCone.build/Debug-iphoneos/PineCone.build/Objects-normal/armv6/PineCone

ld: duplicate symbol _RedirectionLimit in /Users/isaacsutherland/fydp/PineCone/ClientDal/build/Debug-iphoneos/libClientDal.a(libASIHTTPRequest.a-armv6-master.o) and /Users/isaacsutherland/fydp/PineCone/ClientDal/build/Debug-iphoneos/libClientDal.a(libASIHTTPRequest.a-armv6-master.o)
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1

错误是奇怪的,因为它抱怨_RedirectionLimit被发现两次 - 在同一个文件中!libClientDal.a(libASIHTTPRequest.a-armv6-master.o)是违法的图书馆.有人可以帮我理解发生了什么吗？这个库怎么能在第一时间正确编译？或者链接器可能尝试将同一个库包含两次？

此类似问题中提供的解决方法对我不起作用.

如果您需要更多信息,我很乐意提供 - 就像我说的,我是Xcode开发的新手.

Answer 1

当您拥有一个编译为静态库并相互引用的项目Web时,您必须考虑以下两个不同的问题:

• 项目的直接依赖关系通知Xcode哪些项目相互依赖,因此它知道在依赖项发生变化时重新编译项目.

• 项目的Linked Libaries实际上包含在其目标代码中.

简而言之,您的直接依赖关系网可以像您想要的那样纠结,但您必须小心将每个项目的代码链接到应用程序可执行文件中一次.

基本上,我的问题是我有3个项目A,B和C,依赖关系看起来像A => B,A => C,B => C. 我将libC.a链接到A和B,因此链接器抱怨重复的代码.

您需要更改的配置内容位于每个项目目标的"目标信息"页面上.