The idea behind Xcode 4.3, as I understand it, is that it can be a first-class 
App Store app: it doesn't need to install anything as root, or outside of its 
sandbox: it uses external installers for this (witness the Command Line Tools 
installer, etc).

So if that is indeed the case, I have a question some of the tools of Xcode 
that are installed in /usr/bin: xcodebuild, xcode-select, xcrun, etc.

My questions are these:

        (1) Do these tools exist on a machine if Xcode has never been 
installed? (i.e., are they part of the core os?)

        (2) Are these tools installed when Xcode 4.3 is first run? (or at some 
later time?)

        (3) Are these tools installed only when the Command Line Tools 
installer is run?

I don't have a virgin machine to use to get to the bottom of that, but if 
anybody can help with answers it would be useful…

James


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