升级到 OS X Lion 后我应该如何升级 Xcode？
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How should I upgrade Xcode after upgrading to OS X Lion?
提问by Jakub Arnold
I've just found out, that my homebrew doesn't work anymore after I upgraded to OS X Lion.
我刚刚发现，升级到 OS X Lion 后，我的自制软件不再起作用。
$ brew install clojure
Warning: Xcode is not installed! Builds may fail!
Error: No such file or directory - /usr/bin/cc
and
和
$ brew doctor
We couldn't detect gcc 4.2.x. Some formulae require this compiler.
We couldn't detect gcc 4.0.x. Some formulae require this compiler.
You have no /usr/bin/cc. This will cause numerous build issues. Please
reinstall Xcode.
Setting DYLD_LIBRARY_PATH can break dynamic linking.
You should probably unset it.
after some googling, I found out that I should upgrade Xcode to version 4.1. The problem is, I have version 3.2.5 installed and I can't find any way of uninstalling it.
经过一番谷歌搜索后，我发现我应该将 Xcode 升级到 4.1 版。问题是，我安装了 3.2.5 版，但找不到任何卸载它的方法。
When I look at App Store, it looks like I don't have Xcode installed at all. I'm afraid that if I install it via App Store, it will somehow conflict with the version I have currently installed. However I can't find it in Applications, and I can't find any update function either.
当我查看 App Store 时，看起来我根本没有安装 Xcode。我担心如果我通过 App Store 安装它，它会以某种方式与我当前安装的版本冲突。但是我在应用程序中找不到它，我也找不到任何更新功能。
Software Update doesn't prompt me to update Xcode, and I also don't see it in Installed Software.
软件更新不提示我更新 Xcode，我也没有在已安装的软件中看到它。
What should I do?
我该怎么办？
回答by Jakub Arnold
Thanks to the readme found at /Developer, I found a way to uninstall Xcode via
感谢在 中找到的自述文件/Developer，我找到了一种通过以下方式卸载 Xcode 的方法
$ sudo /Developer/Library/uninstall-devtools --mode=all
edit:I just ran the installer for Xcode 4, and it detected old version of Xcode, offering me to move it to /Developer-old.
编辑：我刚刚运行了 Xcode 4 的安装程序，它检测到旧版本的 Xcode，让我将其移动到/Developer-old.
回答by techarch
I fixed it by
我修好了
In theory this should work if you have Xcode4.3 installed (in /Applications):
理论上，如果您安装了 Xcode4.3（在 /Applications 中），这应该可以工作：
$ sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer/
