New answers tagged xcode
Did you try xcode-select? man xcode-select or xcode-select --switch /Applications/Xcode
The command line tools are installed like other OS X packages, so you may need to delete the receipt file from the receipts database (which used to be trivial since you could delete the file from /Library/Receipts but now is more complicated and needs a short article on the receipts database). Rather than mess with that, why not just download the stand ...
You can scale iOS simulator to desire scale (I tried from .2 to 1.4 ) and it worked for me. To do this you have to go to /Library/Preferences and edit com.apple.iphonesimulator.plist file. Edit value for KEY SimulatorWindowLastScale to desire scale. I tried this on latest Version of Mountain Lion (10.8.4) and on the iOS 6.0 simulator.
You should make sure that you install Command-line tools. Go to Preferences window (⌘+,), Downloads tab, and click "Install" on "Command Line Tools". That should get you the otool binary installed.
Xcode version With a recent release of Xcode, the default compiler was changed from GCC (like you said) to LLVM (clang) - a more modern compiler, with more error options. It has nothing whatsoever to do with your OS X version.
I've had mixed results with pausing app store download. There is a decent chance it would start over from the beginning of downloading.
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