| <html lang="en"> |
| <head> |
| <title>Preprocessing directives implementation - 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 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="C-Implementation.html#C-Implementation" title="C Implementation"> |
| <link rel="prev" href="Statements-implementation.html#Statements-implementation" title="Statements implementation"> |
| <link rel="next" href="Library-functions-implementation.html#Library-functions-implementation" title="Library functions implementation"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
| 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
| 2008 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.2 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Funding Free Software'', the Front-Cover |
| Texts being (a) (see below), and with the Back-Cover Texts being (b) |
| (see below). A copy of the license is included in the section entitled |
| ``GNU Free Documentation License''. |
| |
| (a) The FSF's Front-Cover Text is: |
| |
| A GNU Manual |
| |
| (b) The FSF's Back-Cover Text is: |
| |
| 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 } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Preprocessing-directives-implementation"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="Library-functions-implementation.html#Library-functions-implementation">Library functions implementation</a>, |
| Previous: <a rel="previous" accesskey="p" href="Statements-implementation.html#Statements-implementation">Statements implementation</a>, |
| Up: <a rel="up" accesskey="u" href="C-Implementation.html#C-Implementation">C Implementation</a> |
| <hr> |
| </div> |
| |
| <h3 class="section">4.13 Preprocessing directives</h3> |
| |
| <p>See <a href="../cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a>, for details of these aspects of |
| implementation-defined behavior. |
| |
| <ul> |
| <li><cite>How sequences in both forms of header names are mapped to headers |
| or external source file names (C90 6.1.7, C99 6.4.7).</cite> |
| |
| <li><cite>Whether the value of a character constant in a constant expression |
| that controls conditional inclusion matches the value of the same character |
| constant in the execution character set (C90 6.8.1, C99 6.10.1).</cite> |
| |
| <li><cite>Whether the value of a single-character character constant in a |
| constant expression that controls conditional inclusion may have a |
| negative value (C90 6.8.1, C99 6.10.1).</cite> |
| |
| <li><cite>The places that are searched for an included ‘</cite><samp><span class="samp"><></span></samp><cite>’ delimited |
| header, and how the places are specified or the header is |
| identified (C90 6.8.2, C99 6.10.2).</cite> |
| |
| <li><cite>How the named source file is searched for in an included ‘</cite><samp><span class="samp">""</span></samp><cite>’ |
| delimited header (C90 6.8.2, C99 6.10.2).</cite> |
| |
| <li><cite>The method by which preprocessing tokens (possibly resulting from |
| macro expansion) in a </cite><code>#include</code><cite> directive are combined into a header |
| name (C90 6.8.2, C99 6.10.2).</cite> |
| |
| <li><cite>The nesting limit for </cite><code>#include</code><cite> processing (C90 6.8.2, C99 |
| 6.10.2).</cite> |
| |
| <li><cite>Whether the ‘</cite><samp><span class="samp">#</span></samp><cite>’ operator inserts a ‘</cite><samp><span class="samp">\</span></samp><cite>’ character before |
| the ‘</cite><samp><span class="samp">\</span></samp><cite>’ character that begins a universal character name in a |
| character constant or string literal (C99 6.10.3.2).</cite> |
| |
| <li><cite>The behavior on each recognized non-</cite><code>STDC #pragma</code><cite> |
| directive (C90 6.8.6, C99 6.10.6).</cite> |
| |
| <p>See <a href="../cpp/Pragmas.html#Pragmas">Pragmas</a>, for details of |
| pragmas accepted by GCC on all targets. See <a href="Pragmas.html#Pragmas">Pragmas Accepted by GCC</a>, for details of target-specific pragmas. |
| |
| <li><cite>The definitions for </cite><code>__DATE__</code><cite> and </cite><code>__TIME__</code><cite> when |
| respectively, the date and time of translation are not available (C90 |
| 6.8.8, C99 6.10.8).</cite> |
| |
| </ul> |
| |
| </body></html> |
| |