Information Technology Reference
In-Depth Information
A hidden option makes it possible to choose Other and then select or create your own destination folder.
Installing to a different folder or disk creates a split installation. Around 900MB of key features, including some
of the system tools, are always installed to the /Developer directory on the main system disk. The rest of Xcode
can be installed in any folder you specify.
Typically, you see a list of optional features in the main install dialog box. The UNIX Development tools are of
interest only to developers who want a separate set of compiler tools that can be accessed from Terminal using
the command line. If you're not interested in UNIX development, you can leave this option uninstalled.
In the past, the documentation was downloaded and installed with Xcode. Now it's downloaded separately after
you run Xcode. You can ignore the internal documentation and use Apple's web documentation exclusively, but
there are good reasons to use both if you can. For more details about installing and using the documentation,
see Chapter 6.
Depending on the current version of iOS or OS X, you may see more than one SDK listed here. In Xcode, an
SDK is a collection of code libraries that build code for a specific version of either OS X or iOS. For example,
Xcode uses different two iOS SDK libraries to build apps for the Simulator and for hardware devices.
In Xcode 4, Apple typically bundles all legacy versions into a single combined SDK for a given platform. You're
no longer given a choice about which versions are installed, and all supported legacy versions are made avail-
able. This may change with future updates.
CROSS-REFERENCE
