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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/cpp/Search-Path.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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diff --git a/share/doc/cpp/Search-Path.html b/share/doc/cpp/Search-Path.html new file mode 100644 index 0000000..8ccecbc --- /dev/null +++ b/share/doc/cpp/Search-Path.html @@ -0,0 +1,134 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1987-2023 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 1.3 or +any later version published by the Free Software Foundation. A copy of +the license is included in the +section entitled "GNU Free Documentation License". + +This manual contains no Invariant Sections. The Front-Cover Texts are +(a) (see below), and the Back-Cover Texts are (b) (see below). + +(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. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>The C Preprocessor: Search Path</title> + +<meta name="description" content="The C Preprocessor: Search Path"> +<meta name="keywords" content="The C Preprocessor: Search Path"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Index-of-Directives.html#Index-of-Directives" rel="index" title="Index of Directives"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Header-Files.html#Header-Files" rel="up" title="Header Files"> +<link href="Once_002dOnly-Headers.html#Once_002dOnly-Headers" rel="next" title="Once-Only Headers"> +<link href="Include-Operation.html#Include-Operation" rel="previous" title="Include Operation"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Search-Path"></a> +<div class="header"> +<p> +Next: <a href="Once_002dOnly-Headers.html#Once_002dOnly-Headers" accesskey="n" rel="next">Once-Only Headers</a>, Previous: <a href="Include-Operation.html#Include-Operation" accesskey="p" rel="previous">Include Operation</a>, Up: <a href="Header-Files.html#Header-Files" accesskey="u" rel="up">Header Files</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index-of-Directives.html#Index-of-Directives" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Search-Path-1"></a> +<h3 class="section">2.3 Search Path</h3> + +<p>By default, the preprocessor looks for header files included by the quote +form of the directive <code>#include "<var>file</var>"<!-- /@w --></code> first relative to +the directory of the current file, and then in a preconfigured list +of standard system directories. +For example, if <samp>/usr/include/sys/stat.h</samp> contains +<code>#include "types.h"<!-- /@w --></code>, GCC looks for <samp>types.h</samp> first in +<samp>/usr/include/sys</samp>, then in its usual search path. +</p> +<p>For the angle-bracket form <code>#include <<var>file</var>><!-- /@w --></code>, the +preprocessor’s default behavior is to look only in the standard system +directories. The exact search directory list depends on the target +system, how GCC is configured, and where it is installed. You can +find the default search directory list for your version of CPP by +invoking it with the <samp>-v</samp> option. For example, +</p> +<div class="smallexample"> +<pre class="smallexample">cpp -v /dev/null -o /dev/null +</pre></div> + +<p>There are a number of command-line options you can use to add +additional directories to the search path. +The most commonly-used option is <samp>-I<var>dir</var></samp>, which causes +<var>dir</var> to be searched after the current directory (for the quote +form of the directive) and ahead of the standard system directories. +You can specify multiple <samp>-I</samp> options on the command line, +in which case the directories are searched in left-to-right order. +</p> +<p>If you need separate control over the search paths for the quote and +angle-bracket forms of the ‘<samp>#include</samp>’ directive, you can use the +<samp>-iquote</samp> and/or <samp>-isystem</samp> options instead of <samp>-I</samp>. +See <a href="Invocation.html#Invocation">Invocation</a>, for a detailed description of these options, as +well as others that are less generally useful. +</p> +<p>If you specify other options on the command line, such as <samp>-I</samp>, +that affect where the preprocessor searches for header files, the +directory list printed by the <samp>-v</samp> option reflects the actual +search path used by the preprocessor. +</p> +<p>Note that you can also prevent the preprocessor from searching any of +the default system header directories with the <samp>-nostdinc</samp> +option. This is useful when you are compiling an operating system +kernel or some other program that does not use the standard C library +facilities, or the standard C library itself. +</p> +<hr> +<div class="header"> +<p> +Next: <a href="Once_002dOnly-Headers.html#Once_002dOnly-Headers" accesskey="n" rel="next">Once-Only Headers</a>, Previous: <a href="Include-Operation.html#Include-Operation" accesskey="p" rel="previous">Include Operation</a>, Up: <a href="Header-Files.html#Header-Files" accesskey="u" rel="up">Header Files</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index-of-Directives.html#Index-of-Directives" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |