ios5.1二货,手贱，解决方案

Snow Leopard and SDK 5.1...

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You may or may not be aware that if you upgrade your device(s) to 5.1 (hastily, as we tend to do!), and you're using Snow Leopard, there's NO 5.1 SDK available. Apple are saying, download XCode 4.3.1, which of course requires Lion. Well, I for one can't upgrade to Lion as I have stuff in my environment which apparently breaks under Lion. So rather than restore my devices to 5.0.1 and all the hassle that involves, I put my hacking hat on and came up with the following solution.
It presumes your current XCode 4.2 installation is in /Developer, and make sure XCode is NOT running.
Download the Lion 4.3.1 XCode DMG file, and mount it so that you can see it from Finder.
Fire up a Terminal (Applications->Utilities->Terminal) - yes we know some of you are UNIX-virgins but it's all straightforward
Now enter the following commands into the terminal (note, your password will have to be entered after the first command):

Code:

sudo cp -R /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/
sudo cp -R /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/
sudo cp -R /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/5.1\ \(9B176\) /Developer/Platforms/iPhoneOS.platform/DeviceSupport/
sudo rm -f /Developer/Platforms/iPhoneOS.platform/DeviceSupport/Latest
cd /Developer/Platforms/iPhoneOS.platform/DeviceSupport/
sudo ln -s ./5.1\ \(9B176\) ./Latest

Now just unmount the dmg in Finder, fire back up XCode, and your 5.1 device will now work with XCode 4.2...
Hope that helps people!