| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- This file documents the GNU linker LD |
| (Linaro_Binutils-2017.01) |
| version 2.24.0. |
| |
| Copyright (C) 1991-2013 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 no Invariant Sections, with no Front-Cover Texts, and with no |
| Back-Cover Texts. A copy of the license is included in the |
| section entitled "GNU Free Documentation License". --> |
| <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ --> |
| <head> |
| <title>LD: File Commands</title> |
| |
| <meta name="description" content="LD: File Commands"> |
| <meta name="keywords" content="LD: File Commands"> |
| <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="LD-Index.html#LD-Index" rel="index" title="LD Index"> |
| <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> |
| <link href="Simple-Commands.html#Simple-Commands" rel="up" title="Simple Commands"> |
| <link href="Format-Commands.html#Format-Commands" rel="next" title="Format Commands"> |
| <link href="Entry-Point.html#Entry-Point" rel="prev" title="Entry Point"> |
| <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="File-Commands"></a> |
| <div class="header"> |
| <p> |
| Next: <a href="Format-Commands.html#Format-Commands" accesskey="n" rel="next">Format Commands</a>, Previous: <a href="Entry-Point.html#Entry-Point" accesskey="p" rel="prev">Entry Point</a>, Up: <a href="Simple-Commands.html#Simple-Commands" accesskey="u" rel="up">Simple Commands</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="LD-Index.html#LD-Index" title="Index" rel="index">Index</a>]</p> |
| </div> |
| <hr> |
| <a name="Commands-Dealing-with-Files"></a> |
| <h4 class="subsection">3.4.2 Commands Dealing with Files</h4> |
| <a name="index-linker-script-file-commands"></a> |
| <p>Several linker script commands deal with files. |
| </p> |
| <dl compact="compact"> |
| <dt><code>INCLUDE <var>filename</var></code></dt> |
| <dd><a name="index-INCLUDE-filename"></a> |
| <a name="index-including-a-linker-script"></a> |
| <p>Include the linker script <var>filename</var> at this point. The file will |
| be searched for in the current directory, and in any directory specified |
| with the <samp>-L</samp> option. You can nest calls to <code>INCLUDE</code> up to |
| 10 levels deep. |
| </p> |
| <p>You can place <code>INCLUDE</code> directives at the top level, in <code>MEMORY</code> or |
| <code>SECTIONS</code> commands, or in output section descriptions. |
| </p> |
| </dd> |
| <dt><code>INPUT(<var>file</var>, <var>file</var>, …)</code></dt> |
| <dt><code>INPUT(<var>file</var> <var>file</var> …)</code></dt> |
| <dd><a name="index-INPUT_0028files_0029"></a> |
| <a name="index-input-files-in-linker-scripts"></a> |
| <a name="index-input-object-files-in-linker-scripts"></a> |
| <a name="index-linker-script-input-object-files"></a> |
| <p>The <code>INPUT</code> command directs the linker to include the named files |
| in the link, as though they were named on the command line. |
| </p> |
| <p>For example, if you always want to include <samp>subr.o</samp> any time you do |
| a link, but you can’t be bothered to put it on every link command line, |
| then you can put ‘<samp>INPUT (subr.o)</samp>’ in your linker script. |
| </p> |
| <p>In fact, if you like, you can list all of your input files in the linker |
| script, and then invoke the linker with nothing but a ‘<samp>-T</samp>’ option. |
| </p> |
| <p>In case a <em>sysroot prefix</em> is configured, and the filename starts |
| with the ‘<samp>/</samp>’ character, and the script being processed was |
| located inside the <em>sysroot prefix</em>, the filename will be looked |
| for in the <em>sysroot prefix</em>. Otherwise, the linker will try to |
| open the file in the current directory. If it is not found, the |
| linker will search through the archive library search path. See the |
| description of ‘<samp>-L</samp>’ in <a href="Options.html#Options">Command Line Options</a>. |
| </p> |
| <p>If you use ‘<samp>INPUT (-l<var>file</var>)</samp>’, <code>ld</code> will transform the |
| name to <code>lib<var>file</var>.a</code>, as with the command line argument |
| ‘<samp>-l</samp>’. |
| </p> |
| <p>When you use the <code>INPUT</code> command in an implicit linker script, the |
| files will be included in the link at the point at which the linker |
| script file is included. This can affect archive searching. |
| </p> |
| </dd> |
| <dt><code>GROUP(<var>file</var>, <var>file</var>, …)</code></dt> |
| <dt><code>GROUP(<var>file</var> <var>file</var> …)</code></dt> |
| <dd><a name="index-GROUP_0028files_0029"></a> |
| <a name="index-grouping-input-files"></a> |
| <p>The <code>GROUP</code> command is like <code>INPUT</code>, except that the named |
| files should all be archives, and they are searched repeatedly until no |
| new undefined references are created. See the description of ‘<samp>-(</samp>’ |
| in <a href="Options.html#Options">Command Line Options</a>. |
| </p> |
| </dd> |
| <dt><code>AS_NEEDED(<var>file</var>, <var>file</var>, …)</code></dt> |
| <dt><code>AS_NEEDED(<var>file</var> <var>file</var> …)</code></dt> |
| <dd><a name="index-AS_005fNEEDED_0028files_0029"></a> |
| <p>This construct can appear only inside of the <code>INPUT</code> or <code>GROUP</code> |
| commands, among other filenames. The files listed will be handled |
| as if they appear directly in the <code>INPUT</code> or <code>GROUP</code> commands, |
| with the exception of ELF shared libraries, that will be added only |
| when they are actually needed. This construct essentially enables |
| <samp>--as-needed</samp> option for all the files listed inside of it |
| and restores previous <samp>--as-needed</samp> resp. <samp>--no-as-needed</samp> |
| setting afterwards. |
| </p> |
| </dd> |
| <dt><code>OUTPUT(<var>filename</var>)</code></dt> |
| <dd><a name="index-OUTPUT_0028filename_0029"></a> |
| <a name="index-output-file-name-in-linker-script"></a> |
| <p>The <code>OUTPUT</code> command names the output file. Using |
| <code>OUTPUT(<var>filename</var>)</code> in the linker script is exactly like using |
| ‘<samp>-o <var>filename</var></samp>’ on the command line (see <a href="Options.html#Options">Command |
| Line Options</a>). If both are used, the command line option takes |
| precedence. |
| </p> |
| <p>You can use the <code>OUTPUT</code> command to define a default name for the |
| output file other than the usual default of <samp>a.out</samp>. |
| </p> |
| </dd> |
| <dt><code>SEARCH_DIR(<var>path</var>)</code></dt> |
| <dd><a name="index-SEARCH_005fDIR_0028path_0029"></a> |
| <a name="index-library-search-path-in-linker-script"></a> |
| <a name="index-archive-search-path-in-linker-script"></a> |
| <a name="index-search-path-in-linker-script"></a> |
| <p>The <code>SEARCH_DIR</code> command adds <var>path</var> to the list of paths where |
| <code>ld</code> looks for archive libraries. Using |
| <code>SEARCH_DIR(<var>path</var>)</code> is exactly like using ‘<samp>-L <var>path</var></samp>’ |
| on the command line (see <a href="Options.html#Options">Command Line Options</a>). If both |
| are used, then the linker will search both paths. Paths specified using |
| the command line option are searched first. |
| </p> |
| </dd> |
| <dt><code>STARTUP(<var>filename</var>)</code></dt> |
| <dd><a name="index-STARTUP_0028filename_0029"></a> |
| <a name="index-first-input-file"></a> |
| <p>The <code>STARTUP</code> command is just like the <code>INPUT</code> command, except |
| that <var>filename</var> will become the first input file to be linked, as |
| though it were specified first on the command line. This may be useful |
| when using a system in which the entry point is always the start of the |
| first file. |
| </p></dd> |
| </dl> |
| |
| <hr> |
| <div class="header"> |
| <p> |
| Next: <a href="Format-Commands.html#Format-Commands" accesskey="n" rel="next">Format Commands</a>, Previous: <a href="Entry-Point.html#Entry-Point" accesskey="p" rel="prev">Entry Point</a>, Up: <a href="Simple-Commands.html#Simple-Commands" accesskey="u" rel="up">Simple Commands</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="LD-Index.html#LD-Index" title="Index" rel="index">Index</a>]</p> |
| </div> |
| |
| |
| |
| </body> |
| </html> |
