1<html lang="en"> 2<head> 3<title>Implementation Details - The C Preprocessor</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="The C Preprocessor"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="prev" href="Traditional-Mode.html#Traditional-Mode" title="Traditional Mode"> 9<link rel="next" href="Invocation.html#Invocation" title="Invocation"> 10<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 11<!-- 12Copyright (C) 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 131997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 142008, 2009, 2010, 2011 15Free Software Foundation, Inc. 16 17Permission is granted to copy, distribute and/or modify this document 18under the terms of the GNU Free Documentation License, Version 1.3 or 19any later version published by the Free Software Foundation. A copy of 20the license is included in the 21section entitled ``GNU Free Documentation License''. 22 23This manual contains no Invariant Sections. The Front-Cover Texts are 24(a) (see below), and the Back-Cover Texts are (b) (see below). 25 26(a) The FSF's Front-Cover Text is: 27 28 A GNU Manual 29 30(b) The FSF's Back-Cover Text is: 31 32 You have freedom to copy and modify this GNU Manual, like GNU 33 software. Copies published by the Free Software Foundation raise 34 funds for GNU development. 35--> 36<meta http-equiv="Content-Style-Type" content="text/css"> 37<style type="text/css"><!-- 38 pre.display { font-family:inherit } 39 pre.format { font-family:inherit } 40 pre.smalldisplay { font-family:inherit; font-size:smaller } 41 pre.smallformat { font-family:inherit; font-size:smaller } 42 pre.smallexample { font-size:smaller } 43 pre.smalllisp { font-size:smaller } 44 span.sc { font-variant:small-caps } 45 span.roman { font-family:serif; font-weight:normal; } 46 span.sansserif { font-family:sans-serif; font-weight:normal; } 47--></style> 48<link rel="stylesheet" type="text/css" href="../cs.css"> 49</head> 50<body> 51<div class="node"> 52<a name="Implementation-Details"></a> 53<p> 54Next: <a rel="next" accesskey="n" href="Invocation.html#Invocation">Invocation</a>, 55Previous: <a rel="previous" accesskey="p" href="Traditional-Mode.html#Traditional-Mode">Traditional Mode</a>, 56Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a> 57<hr> 58</div> 59 60<h2 class="chapter">11 Implementation Details</h2> 61 62<p>Here we document details of how the preprocessor's implementation 63affects its user-visible behavior. You should try to avoid undue 64reliance on behavior described here, as it is possible that it will 65change subtly in future implementations. 66 67 <p>Also documented here are obsolete features and changes from previous 68versions of CPP. 69 70<ul class="menu"> 71<li><a accesskey="1" href="Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a> 72<li><a accesskey="2" href="Implementation-limits.html#Implementation-limits">Implementation limits</a> 73<li><a accesskey="3" href="Obsolete-Features.html#Obsolete-Features">Obsolete Features</a> 74<li><a accesskey="4" href="Differences-from-previous-versions.html#Differences-from-previous-versions">Differences from previous versions</a> 75</ul> 76 77 </body></html> 78 79