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-\chapter Using Precompiled Headers
-
-\target About
-\section1 About Precompiled Headers
-\index About Precompiled Headers
-\index Using Precompiled Headers
-\index Precompiled Headers
-\index PCH
-
-Precompiled headers are a performance feature supported by some
-compilers to compile a stable body of code, and store the compiled
-state of the code in a binary file. During subsequent compilations,
-the compiler will load the stored state, and continue compiling the
-specified file. Each subsequent compilation is faster because the
-stable code does not need to be recompiled.
-
-\e qmake supports the use of precompiled headers (PCH) on some
-platforms and build environments, including:
-\list
-\i Windows
-    \list
-    \i nmake
-    \i Dsp projects (VC 6.0)
-    \i Vcproj projects (VC 7.0 \& 7.1)
-    \endlist
-\i Mac OS X
-    \list
-    \i Makefile
-    \i Xcode
-    \i GCC 3.3 and up
-    \endlist
-\i Unix
-    \list
-    \i GCC 3.4 and up
-    \endlist
-\endlist
-
-
-\target ADD_PCH
-\section1 Adding PCH to your project
-
-
-\target PCH_CONTENTS
-\section2 Contents of the precompiled header file
-
-The precompiled header must contain code which is \e stable
-and \e static throughout your project. A typical PCH might look
-like this:
-\section3 stable.h
-
-\code
-	/* Add C includes here */
-	
-	#if defined __cplusplus
-	/* Add C++ includes here */
-	#include <stdlib>
-	#include <iostream>
-	#include <vector>
-	#include <tqapplication.h> // TQt includes
-	#include <tqpushbutton.h>
-	#include <tqlabel.h>
-	#include "thirdparty/include/libmain.h"
-	#include "my_stable_class.h"
-	...
-	#endif
-\endcode
-
-Note that a precompiled header file needs to separate C includes from
-CPP includes, since the precompiled header file for C files may not
-contain C++ code.
-
-
-\target PROJECT_OPTIONS
-\section2 Project options
-
-To make your project use PCH, the only thing you need to change in
-your project settings (.pro), is to include the PRECOMPILED_HEADER option:
-\code
-	PRECOMPILED_HEADER = stable.h
-\endcode
-\e qmake will handle the rest, to ensure the creation and use of the
-precompiled header file. You do not need to include the precompiled
-header file in HEADERS, as qmake will do this if the configuration
-supports PCH.
-
-All platforms that support precompiled headers have the configuration
-option \Bold precompile_header set. Using this option, you may trigger
-conditional blocks in your .pro file, to add settings when using PCH.
-For example:
-\code
-	precompile_header:!isEmpty(PRECOMPILED_HEADER) {
-	    DEFINES += USING_PCH
-	}
-
-\endcode
-
-\target EXAMPLE_PROJECT
-\section1 Example project
-
-You can find the following source code in the
-\e{qt/qmake/examples/precompile} directory:
-
-\Bold mydialog.ui
-\quotefile precompile/mydialog.ui
-\skipto <!
-\printuntil </UI>
-
-\Bold stable.h
-\quotefile precompile/stable.h
-\skipto /*
-\printuntil #endif
-
-\Bold myobject.h
-\quotefile precompile/myobject.h
-\skipto #include
-\printuntil }
-
-\Bold myobject.cpp
-\quotefile precompile/myobject.cpp
-\skipto #include
-\printuntil }
-
-\Bold util.cpp
-\quotefile precompile/util.cpp
-\skipto void
-\printuntil }
-
-\Bold main.cpp
-\quotefile precompile/main.cpp
-\skipto #include
-\printuntil }
-
-\Bold precompile.pro
-\quotefile precompile/precompile.pro
-\skipto #
-\printuntil .ui