128 lines
6.3 KiB
HTML
128 lines
6.3 KiB
HTML
|
<!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-2017.02)
|
||
|
|
version 2.27.0.
|
||
|
|
|
||
|
|
Copyright (C) 1991-2016 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: Format Commands</title>
|
||
|
|
|
||
|
|
<meta name="description" content="LD: Format Commands">
|
||
|
|
<meta name="keywords" content="LD: Format 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="REGION_005fALIAS.html#REGION_005fALIAS" rel="next" title="REGION_ALIAS">
|
||
|
|
<link href="File-Commands.html#File-Commands" rel="prev" title="File Commands">
|
||
|
|
<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="Format-Commands"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="REGION_005fALIAS.html#REGION_005fALIAS" accesskey="n" rel="next">REGION_ALIAS</a>, Previous: <a href="File-Commands.html#File-Commands" accesskey="p" rel="prev">File Commands</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-Object-File-Formats"></a>
|
||
|
|
<h4 class="subsection">3.4.3 Commands Dealing with Object File Formats</h4>
|
||
|
|
<p>A couple of linker script commands deal with object file formats.
|
||
|
|
</p>
|
||
|
|
<dl compact="compact">
|
||
|
|
<dt><code>OUTPUT_FORMAT(<var>bfdname</var>)</code></dt>
|
||
|
|
<dt><code>OUTPUT_FORMAT(<var>default</var>, <var>big</var>, <var>little</var>)</code></dt>
|
||
|
|
<dd><a name="index-OUTPUT_005fFORMAT_0028bfdname_0029"></a>
|
||
|
|
<a name="index-output-file-format-in-linker-script"></a>
|
||
|
|
<p>The <code>OUTPUT_FORMAT</code> command names the BFD format to use for the
|
||
|
|
output file (see <a href="BFD.html#BFD">BFD</a>). Using <code>OUTPUT_FORMAT(<var>bfdname</var>)</code> is
|
||
|
|
exactly like using ‘<samp>--oformat <var>bfdname</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 <code>OUTPUT_FORMAT</code> with three arguments to use different
|
||
|
|
formats based on the ‘<samp>-EB</samp>’ and ‘<samp>-EL</samp>’ command line options.
|
||
|
|
This permits the linker script to set the output format based on the
|
||
|
|
desired endianness.
|
||
|
|
</p>
|
||
|
|
<p>If neither ‘<samp>-EB</samp>’ nor ‘<samp>-EL</samp>’ are used, then the output format
|
||
|
|
will be the first argument, <var>default</var>. If ‘<samp>-EB</samp>’ is used, the
|
||
|
|
output format will be the second argument, <var>big</var>. If ‘<samp>-EL</samp>’ is
|
||
|
|
used, the output format will be the third argument, <var>little</var>.
|
||
|
|
</p>
|
||
|
|
<p>For example, the default linker script for the MIPS ELF target uses this
|
||
|
|
command:
|
||
|
|
</p><div class="smallexample">
|
||
|
|
<pre class="smallexample">OUTPUT_FORMAT(elf32-bigmips, elf32-bigmips, elf32-littlemips)
|
||
|
|
</pre></div>
|
||
|
|
<p>This says that the default format for the output file is
|
||
|
|
‘<samp>elf32-bigmips</samp>’, but if the user uses the ‘<samp>-EL</samp>’ command line
|
||
|
|
option, the output file will be created in the ‘<samp>elf32-littlemips</samp>’
|
||
|
|
format.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt><code>TARGET(<var>bfdname</var>)</code></dt>
|
||
|
|
<dd><a name="index-TARGET_0028bfdname_0029"></a>
|
||
|
|
<a name="index-input-file-format-in-linker-script"></a>
|
||
|
|
<p>The <code>TARGET</code> command names the BFD format to use when reading input
|
||
|
|
files. It affects subsequent <code>INPUT</code> and <code>GROUP</code> commands.
|
||
|
|
This command is like using ‘<samp>-b <var>bfdname</var></samp>’ on the command line
|
||
|
|
(see <a href="Options.html#Options">Command Line Options</a>). If the <code>TARGET</code> command
|
||
|
|
is used but <code>OUTPUT_FORMAT</code> is not, then the last <code>TARGET</code>
|
||
|
|
command is also used to set the format for the output file. See <a href="BFD.html#BFD">BFD</a>.
|
||
|
|
</p></dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="REGION_005fALIAS.html#REGION_005fALIAS" accesskey="n" rel="next">REGION_ALIAS</a>, Previous: <a href="File-Commands.html#File-Commands" accesskey="p" rel="prev">File Commands</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>
|