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One little-known usage pattern of the C preprocessor is known as [[X Macro|X-Macros]].<ref name="X_macros">[http://liw.iki.fi/liw/texts/cpp-trick.html Wirzenius, Lars. C "Preprocessor Trick For Implementing Similar Data Types". Retrieved January 9, 2011]</ref><ref>{{cite journal | last = Meyers | first = Randy |date=May 2001 | title = The New C: X Macros | journal = Dr. Dobb's Journal | url = http://www.ddj.com/cpp/184401387 | access-date = 1 May 2008 }}</ref><ref>{{cite journal | last = Beal | first = Stephan |date=August 2004 | title = Supermacros | url = http://wanderinghorse.net/computing/papers/#supermacros | access-date = 27 October 2008 }}</ref> An X-Macro is a [[header file]]. Commonly, these use the extension <code>.def</code> instead of the traditional <code>.h</code> . This file contains a list of similar macro calls, which can be referred to as "component macros." The include file is then referenced repeatedly.
Many compilers define additional, non-standard macros. A common reference for these macros is the [
Most compilers targeting [[Microsoft Windows]] implicitly define <code>_WIN32</code>.<ref>[http://msdn.microsoft.com/en-us/library/b0084kay.aspx List of predefined ANSI C and Microsoft C++ implementation macros.]</ref> This allows code, including preprocessor commands, to compile only when targeting Windows systems. A few compilers define <code>WIN32</code> instead. For such compilers that do not implicitly define the <code>_WIN32</code> macro, it can be specified on the compiler's command line, using <code>-D_WIN32</code>.
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* [https://gcc.gnu.org/onlinedocs/cpp/index.html GNU CPP online manual]
* [http://msdn.microsoft.com/en-us/library/y4skk93w(VS.80).aspx Visual Studio .NET preprocessor reference]
* [
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