构建时 Xcode 4(最终版本)错误 [英] Xcode 4 (final version) error when building

问题描述

我似乎找不到答案.

我刚刚使用了 Xcode 4 最终版本并构建了一个使用 Xcode 3 构建正常的现有项目，但出现此错误:

I've just used Xcode 4 final version and built an existing project that was built ok with Xcode 3, but got this error:

ld: library not found for -lSystem.B
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1    

但是使用 Xcode 4 构建了另一个项目.

But another project was built OK with Xcode 4.

我通过选择默认选项安装了 Xcode 4.

I installed Xcode 4 by choosing the default options.

我是否想在某处包含库或框架?

Do I miss to include a library or framework somewhere?

有人可以帮忙吗?谢谢.

Could somebody please help. Thank you.

推荐答案

这是我针对 Xcode 4.0.2 和 SDK 4.3 环境的解决方案，但我相信它也适用于其他设置.

Here's my solution for Xcode 4.0.2 with SDK 4.3 environment, but I believe it should also work on other setups.

1. libSystem.B.dylib 不存在在下面/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk/usr/lib,但是它存在于较低的 SDK版本(例如 iPhoneOS4.2.sdk)
2. 大多数情况libSystem.B.dylib 只是一个libSystem.dylib
的符号链接
3. 所以在iPhoneSimulator4.3.sdk/usr/lib我已经应用了以下命令 sudoln -s libSystem.dyliblibSystem.B.dylib 和我的模拟器构建再次开始工作:)

1. libSystem.B.dylib is not present under /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk/usr/lib, however it is present for lower SDK versions (e.g. iPhoneOS4.2.sdk)
2. most of the cases libSystem.B.dylib is just a symbolic link to libSystem.dylib
3. so in iPhoneSimulator4.3.sdk/usr/lib I've applied following command sudo ln -s libSystem.dylib libSystem.B.dylib and my simulator builds started to work again :)

注意: libSystem.B.dylib 被 Flurry 和 Urban Airship 使用，所以你最好不要删除项目文件中的引用(当然 Urban Airship 没有在模拟器下工作，但我认为 Flurry 可以.libSystem.B.dylib 也可能是您项目中包含的其他库所需要的.

NOTE: libSystem.B.dylib is used by Flurry and Urban Airship so you better don't delete the reference in project file (of course Urban Airship does not work under Simulator, but I think Flurry does. libSystem.B.dylib may also be required by other libraries you included to your project.

更新:升级到 Xcode 4.3 后解决方案仍然适用于 iOS5 Simulator

UPDATE: solution still works for iOS5 Simulator after upgrading to Xcode 4.3

更新，2k12 年 3 月 9 日:对于通过 App Store 安装的 Xcode，在路径上方加上 /Applications/Xcode.app/Contents 或您安装的路径的前缀已安装 Xcode.app.

UPDATE, March 9th, 2k12: for Xcode installations via App Store, prefix above path with /Applications/Xcode.app/Contents or the path where you've installed Xcode.app.

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