Qt's pragma directives

Could anyone point me out to an article, where pragma directives, available in Qt environment would be discussed?

AFAIK pragma directives are preprocessor and compiler directives and have not much to do with Qt itself.

• http://gcc.gnu.org/onlinedocs/cpp/Pragmas.html
• http://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html
• https://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/gcc/pragmas.html

Qt provides some defines, which can be used to do things like enable/disable parts of the source code depending on which platform you are compiling:

• http://qt.nokia.com/doc/4.6/qtglobal.html

You can use them like this:

#ifdef Q_WS_MAC
  (some mac code goes here)
#endif

#ifdef Q_WS_WIN32
  (some windows code goes here)
#endif