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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/gcc/Directory-Options.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gcc/Directory-Options.html b/share/doc/gcc/Directory-Options.html new file mode 100644 index 0000000..7bad43e --- /dev/null +++ b/share/doc/gcc/Directory-Options.html @@ -0,0 +1,329 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- This file documents the use of the GNU compilers. + +Copyright (C) 1988-2023 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; 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. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Using the GNU Compiler Collection (GCC): Directory Options</title> + +<meta name="description" content="Using the GNU Compiler Collection (GCC): Directory Options"> +<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Directory Options"> +<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="Indices.html#Indices" rel="index" title="Indices"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Invoking-GCC.html#Invoking-GCC" rel="up" title="Invoking GCC"> +<link href="Code-Gen-Options.html#Code-Gen-Options" rel="next" title="Code Gen Options"> +<link href="Link-Options.html#Link-Options" rel="previous" title="Link Options"> +<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_US" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Directory-Options"></a> +<div class="header"> +<p> +Next: <a href="Code-Gen-Options.html#Code-Gen-Options" accesskey="n" rel="next">Code Gen Options</a>, Previous: <a href="Link-Options.html#Link-Options" accesskey="p" rel="previous">Link Options</a>, Up: <a href="Invoking-GCC.html#Invoking-GCC" accesskey="u" rel="up">Invoking GCC</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Options-for-Directory-Search"></a> +<h3 class="section">3.16 Options for Directory Search</h3> +<a name="index-directory-options"></a> +<a name="index-options_002c-directory-search"></a> +<a name="index-search-path"></a> + +<p>These options specify directories to search for header files, for +libraries and for parts of the compiler: +</p> +<dl compact="compact"> +<dd> + + +<a name="index-I"></a> +<a name="index-iquote"></a> +<a name="index-isystem"></a> +<a name="index-idirafter"></a> +</dd> +<dt><code>-I <var>dir</var></code></dt> +<dt><code>-iquote <var>dir</var></code></dt> +<dt><code>-isystem <var>dir</var></code></dt> +<dt><code>-idirafter <var>dir</var></code></dt> +<dd><p>Add the directory <var>dir</var> to the list of directories to be searched +for header files during preprocessing. +If <var>dir</var> begins with ‘<samp>=</samp>’ or <code>$SYSROOT</code>, then the ‘<samp>=</samp>’ +or <code>$SYSROOT</code> is replaced by the sysroot prefix; see +<samp>--sysroot</samp> and <samp>-isysroot</samp>. +</p> +<p>Directories specified with <samp>-iquote</samp> apply only to the quote +form of the directive, <code>#include "<var>file</var>"<!-- /@w --></code>. +Directories specified with <samp>-I</samp>, <samp>-isystem</samp>, +or <samp>-idirafter</samp> apply to lookup for both the +<code>#include "<var>file</var>"<!-- /@w --></code> and +<code>#include <<var>file</var>><!-- /@w --></code> directives. +</p> +<p>You can specify any number or combination of these options on the +command line to search for header files in several directories. +The lookup order is as follows: +</p> +<ol> +<li> For the quote form of the include directive, the directory of the current +file is searched first. + +</li><li> For the quote form of the include directive, the directories specified +by <samp>-iquote</samp> options are searched in left-to-right order, +as they appear on the command line. + +</li><li> Directories specified with <samp>-I</samp> options are scanned in +left-to-right order. + +</li><li> Directories specified with <samp>-isystem</samp> options are scanned in +left-to-right order. + +</li><li> Standard system directories are scanned. + +</li><li> Directories specified with <samp>-idirafter</samp> options are scanned in +left-to-right order. +</li></ol> + +<p>You can use <samp>-I</samp> to override a system header +file, substituting your own version, since these directories are +searched before the standard system header file directories. +However, you should +not use this option to add directories that contain vendor-supplied +system header files; use <samp>-isystem</samp> for that. +</p> +<p>The <samp>-isystem</samp> and <samp>-idirafter</samp> options also mark the directory +as a system directory, so that it gets the same special treatment that +is applied to the standard system directories. +</p> +<p>If a standard system include directory, or a directory specified with +<samp>-isystem</samp>, is also specified with <samp>-I</samp>, the <samp>-I</samp> +option is ignored. The directory is still searched but as a +system directory at its normal position in the system include chain. +This is to ensure that GCC’s procedure to fix buggy system headers and +the ordering for the <code>#include_next</code> directive are not inadvertently +changed. +If you really need to change the search order for system directories, +use the <samp>-nostdinc</samp> and/or <samp>-isystem</samp> options. +</p> +<a name="index-I_002d"></a> +</dd> +<dt><code>-I-</code></dt> +<dd><p>Split the include path. +This option has been deprecated. Please use <samp>-iquote</samp> instead for +<samp>-I</samp> directories before the <samp>-I-</samp> and remove the <samp>-I-</samp> +option. +</p> +<p>Any directories specified with <samp>-I</samp> +options before <samp>-I-</samp> are searched only for headers requested with +<code>#include "<var>file</var>"<!-- /@w --></code>; they are not searched for +<code>#include <<var>file</var>><!-- /@w --></code>. If additional directories are +specified with <samp>-I</samp> options after the <samp>-I-</samp>, those +directories are searched for all ‘<samp>#include</samp>’ directives. +</p> +<p>In addition, <samp>-I-</samp> inhibits the use of the directory of the current +file directory as the first search directory for <code>#include "<var>file</var>"<!-- /@w --></code>. There is no way to override this effect of <samp>-I-</samp>. +</p> +<a name="index-iprefix"></a> +</dd> +<dt><code>-iprefix <var>prefix</var></code></dt> +<dd><p>Specify <var>prefix</var> as the prefix for subsequent <samp>-iwithprefix</samp> +options. If the prefix represents a directory, you should include the +final ‘<samp>/</samp>’. +</p> +<a name="index-iwithprefix"></a> +<a name="index-iwithprefixbefore"></a> +</dd> +<dt><code>-iwithprefix <var>dir</var></code></dt> +<dt><code>-iwithprefixbefore <var>dir</var></code></dt> +<dd><p>Append <var>dir</var> to the prefix specified previously with +<samp>-iprefix</samp>, and add the resulting directory to the include search +path. <samp>-iwithprefixbefore</samp> puts it in the same place <samp>-I</samp> +would; <samp>-iwithprefix</samp> puts it where <samp>-idirafter</samp> would. +</p> +<a name="index-isysroot"></a> +</dd> +<dt><code>-isysroot <var>dir</var></code></dt> +<dd><p>This option is like the <samp>--sysroot</samp> option, but applies only to +header files (except for Darwin targets, where it applies to both header +files and libraries). See the <samp>--sysroot</samp> option for more +information. +</p> +<a name="index-imultilib"></a> +</dd> +<dt><code>-imultilib <var>dir</var></code></dt> +<dd><p>Use <var>dir</var> as a subdirectory of the directory containing +target-specific C++ headers. +</p> +<a name="index-nostdinc"></a> +</dd> +<dt><code>-nostdinc</code></dt> +<dd><p>Do not search the standard system directories for header files. +Only the directories explicitly specified with <samp>-I</samp>, +<samp>-iquote</samp>, <samp>-isystem</samp>, and/or <samp>-idirafter</samp> +options (and the directory of the current file, if appropriate) +are searched. +</p> +<a name="index-nostdinc_002b_002b-1"></a> +</dd> +<dt><code>-nostdinc++</code></dt> +<dd><p>Do not search for header files in the C++-specific standard directories, +but do still search the other standard directories. (This option is +used when building the C++ library.) +</p> + +<a name="index-iplugindir_003d"></a> +</dd> +<dt><code>-iplugindir=<var>dir</var></code></dt> +<dd><p>Set the directory to search for plugins that are passed +by <samp>-fplugin=<var>name</var></samp> instead of +<samp>-fplugin=<var>path</var>/<var>name</var>.so</samp>. This option is not meant +to be used by the user, but only passed by the driver. +</p> +<a name="index-L"></a> +</dd> +<dt><code>-L<var>dir</var></code></dt> +<dd><p>Add directory <var>dir</var> to the list of directories to be searched +for <samp>-l</samp>. +</p> +<a name="index-B"></a> +</dd> +<dt><code>-B<var>prefix</var></code></dt> +<dd><p>This option specifies where to find the executables, libraries, +include files, and data files of the compiler itself. +</p> +<p>The compiler driver program runs one or more of the subprograms +<code>cpp</code>, <code>cc1</code>, <code>as</code> and <code>ld</code>. It tries +<var>prefix</var> as a prefix for each program it tries to run, both with and +without ‘<samp><var>machine</var>/<var>version</var>/</samp>’ for the corresponding target +machine and compiler version. +</p> +<p>For each subprogram to be run, the compiler driver first tries the +<samp>-B</samp> prefix, if any. If that name is not found, or if <samp>-B</samp> +is not specified, the driver tries two standard prefixes, +<samp>/usr/lib/gcc/</samp> and <samp>/usr/local/lib/gcc/</samp>. If neither of +those results in a file name that is found, the unmodified program +name is searched for using the directories specified in your +<code>PATH</code> environment variable. +</p> +<p>The compiler checks to see if the path provided by <samp>-B</samp> +refers to a directory, and if necessary it adds a directory +separator character at the end of the path. +</p> +<p><samp>-B</samp> prefixes that effectively specify directory names also apply +to libraries in the linker, because the compiler translates these +options into <samp>-L</samp> options for the linker. They also apply to +include files in the preprocessor, because the compiler translates these +options into <samp>-isystem</samp> options for the preprocessor. In this case, +the compiler appends ‘<samp>include</samp>’ to the prefix. +</p> +<p>The runtime support file <samp>libgcc.a</samp> can also be searched for using +the <samp>-B</samp> prefix, if needed. If it is not found there, the two +standard prefixes above are tried, and that is all. The file is left +out of the link if it is not found by those means. +</p> +<p>Another way to specify a prefix much like the <samp>-B</samp> prefix is to use +the environment variable <code>GCC_EXEC_PREFIX</code>. See <a href="Environment-Variables.html#Environment-Variables">Environment Variables</a>. +</p> +<p>As a special kludge, if the path provided by <samp>-B</samp> is +<samp>[dir/]stage<var>N</var>/</samp>, where <var>N</var> is a number in the range 0 to +9, then it is replaced by <samp>[dir/]include</samp>. This is to help +with boot-strapping the compiler. +</p> +<a name="index-no_002dcanonical_002dprefixes"></a> +</dd> +<dt><code>-no-canonical-prefixes</code></dt> +<dd><p>Do not expand any symbolic links, resolve references to ‘<samp>/../</samp>’ +or ‘<samp>/./</samp>’, or make the path absolute when generating a relative +prefix. +</p> +<a name="index-sysroot"></a> +</dd> +<dt><code>--sysroot=<var>dir</var></code></dt> +<dd><p>Use <var>dir</var> as the logical root directory for headers and libraries. +For example, if the compiler normally searches for headers in +<samp>/usr/include</samp> and libraries in <samp>/usr/lib</samp>, it instead +searches <samp><var>dir</var>/usr/include</samp> and <samp><var>dir</var>/usr/lib</samp>. +</p> +<p>If you use both this option and the <samp>-isysroot</samp> option, then +the <samp>--sysroot</samp> option applies to libraries, but the +<samp>-isysroot</samp> option applies to header files. +</p> +<p>The GNU linker (beginning with version 2.16) has the necessary support +for this option. If your linker does not support this option, the +header file aspect of <samp>--sysroot</samp> still works, but the +library aspect does not. +</p> +<a name="index-no_002dsysroot_002dsuffix"></a> +</dd> +<dt><code>--no-sysroot-suffix</code></dt> +<dd><p>For some targets, a suffix is added to the root directory specified +with <samp>--sysroot</samp>, depending on the other options used, so that +headers may for example be found in +<samp><var>dir</var>/<var>suffix</var>/usr/include</samp> instead of +<samp><var>dir</var>/usr/include</samp>. This option disables the addition of +such a suffix. +</p> +</dd> +</dl> + +<hr> +<div class="header"> +<p> +Next: <a href="Code-Gen-Options.html#Code-Gen-Options" accesskey="n" rel="next">Code Gen Options</a>, Previous: <a href="Link-Options.html#Link-Options" accesskey="p" rel="previous">Link Options</a>, Up: <a href="Invoking-GCC.html#Invoking-GCC" accesskey="u" rel="up">Invoking GCC</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |