Step into Xcode Mac OS X Development

Chapter 22. Xcode and Speed

One of the driving goals behind the development of Xcode has been to speed up the development cycle as much as possible. Some of what Apple has done to make Xcode faster comes for free: You don’t have to do anything special when Apple shifts to a faster version of the gcc compiler package, for instance. Other strategies require your cooperation. This chapter covers them.

Precompiled Headers

Precompiled headers are a feature of almost every modern development system. The idea is that almost all implementation files rely on a large base of header files that they have in common and that don’t often change. A naive strategy of simply reading the headers at the top of each implementation file would result in 90 percent or ...