📄 preprocessing-directives-implementation.html

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<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright &copy; 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.   <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below).  A copy of the license isincluded in the section entitled "GNU Free Documentation License".   <p>(a) The FSF's Front-Cover Text is:   <p>A GNU Manual   <p>(b) The FSF's Back-Cover Text is:   <p>You have freedom to copy and modify this GNU Manual, like GNU     software.  Copies published by the Free Software Foundation raise     funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!--  pre.display { font-family:inherit }  pre.format  { font-family:inherit }  pre.smalldisplay { font-family:inherit; font-size:smaller }  pre.smallformat  { font-family:inherit; font-size:smaller }  pre.smallexample { font-size:smaller }  pre.smalllisp    { font-size:smaller }--></style></head><body><div class="node"><p>Node:&nbsp;<a name="Preprocessing%20directives%20implementation">Preprocessing directives implementation</a>,Next:&nbsp;<a rel="next" accesskey="n" href="Library-functions-implementation.html#Library%20functions%20implementation">Library functions implementation</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="Qualifiers-implementation.html#Qualifiers%20implementation">Qualifiers implementation</a>,Up:&nbsp;<a rel="up" accesskey="u" href="C-Implementation.html#C%20Implementation">C Implementation</a><hr><br></div><h3 class="section">Preprocessing directives</h3>     <ul><li><cite>How sequences in both forms of header names are mapped to headersor external source file names (6.4.7).</cite>     <li><cite>Whether the value of a character constant in a constant expressionthat controls conditional inclusion matches the value of the same characterconstant in the execution character set (6.10.1).</cite>     <li><cite>Whether the value of a single-character character constant in aconstant expression that controls conditional inclusion may have anegative value (6.10.1).</cite>     <li><cite>The places that are searched for an included </cite><code>&lt;&gt;</code><cite> delimitedheader, and how the places are specified or the header isidentified (6.10.2).</cite>     <li><cite>How the named source file is searched for in an included </cite><code>""</code><cite>delimited header (6.10.2).</cite>     <li><cite>The method by which preprocessing tokens (possibly resulting frommacro expansion) in a </cite><code>#include</code><cite> directive are combined into a headername (6.10.2).</cite>     <li><cite>The nesting limit for </cite><code>#include</code><cite> processing (6.10.2).</cite>     <p>GCC imposes a limit of 200 nested <code>#include</code>s.     </p><li><cite>Whether the </cite><code>#</code><cite> operator inserts a </cite><code>\</code><cite> character beforethe </cite><code>\</code><cite> character that begins a universal character name in acharacter constant or string literal (6.10.3.2).</cite>     <li><cite>The behavior on each recognized non-</cite><code>STDC #pragma</code><cite>directive (6.10.6).</cite>     <li><cite>The definitions for </cite><code>__DATE__</code><cite> and </cite><code>__TIME__</code><cite> whenrespectively, the date and time of translation are not available (6.10.8).</cite>     <p>If the date and time are not available, <code>__DATE__</code> expands to<code>"???&nbsp;??&nbsp;????"</code> and <code>__TIME__</code> expands to<code>"??:??:??"</code>.</ul>   </body></html>
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