Is it possible to use XCode6 beta with an IOS 7.1 SDK? The new tools are much nicer but I need to build for IOS7
From the command line, you can copy the 7.1 SDK from the current Xcode distribution to the Xcode 6 Beta distribution like this:
cp -r /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.1.sdk /Applications/Xcode6-Beta5.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/
The example above will recursively copy the contents of the iPhoneOS7.1.sdk folder to the appropriate destination for Xcode6-Beta5 . Copying the SDK to Xcode6-Beta6 would require adjusting the command line to point to the Xcode6-Beta6.app folder.