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">
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<html>
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<!-- This file documents the GNU linker LD
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(Linaro_Binutils-2017.02)
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version 2.27.0.
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Copyright (C) 1991-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License". -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>LD: Format Commands</title>
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<meta name="description" content="LD: Format Commands">
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<meta name="keywords" content="LD: Format Commands">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="LD-Index.html#LD-Index" rel="index" title="LD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Simple-Commands.html#Simple-Commands" rel="up" title="Simple Commands">
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<link href="REGION_005fALIAS.html#REGION_005fALIAS" rel="next" title="REGION_ALIAS">
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<link href="File-Commands.html#File-Commands" rel="prev" title="File Commands">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.indentedblock {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style:oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Format-Commands"></a>
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<div class="header">
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<p>
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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>
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</div>
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<hr>
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<a name="Commands-Dealing-with-Object-File-Formats"></a>
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<h4 class="subsection">3.4.3 Commands Dealing with Object File Formats</h4>
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<p>A couple of linker script commands deal with object file formats.
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</p>
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<dl compact="compact">
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<dt><code>OUTPUT_FORMAT(<var>bfdname</var>)</code></dt>
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<dt><code>OUTPUT_FORMAT(<var>default</var>, <var>big</var>, <var>little</var>)</code></dt>
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<dd><a name="index-OUTPUT_005fFORMAT_0028bfdname_0029"></a>
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<a name="index-output-file-format-in-linker-script"></a>
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<p>The <code>OUTPUT_FORMAT</code> command names the BFD format to use for the
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output file (see <a href="BFD.html#BFD">BFD</a>). Using <code>OUTPUT_FORMAT(<var>bfdname</var>)</code> is
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exactly like using ‘<samp>--oformat <var>bfdname</var></samp>’ on the command line
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(see <a href="Options.html#Options">Command Line Options</a>). If both are used, the command
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line option takes precedence.
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</p>
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<p>You can use <code>OUTPUT_FORMAT</code> with three arguments to use different
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formats based on the ‘<samp>-EB</samp>’ and ‘<samp>-EL</samp>’ command line options.
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This permits the linker script to set the output format based on the
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desired endianness.
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</p>
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<p>If neither ‘<samp>-EB</samp>’ nor ‘<samp>-EL</samp>’ are used, then the output format
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will be the first argument, <var>default</var>. If ‘<samp>-EB</samp>’ is used, the
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output format will be the second argument, <var>big</var>. If ‘<samp>-EL</samp>’ is
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used, the output format will be the third argument, <var>little</var>.
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</p>
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<p>For example, the default linker script for the MIPS ELF target uses this
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command:
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</p><div class="smallexample">
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<pre class="smallexample">OUTPUT_FORMAT(elf32-bigmips, elf32-bigmips, elf32-littlemips)
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</pre></div>
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<p>This says that the default format for the output file is
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‘<samp>elf32-bigmips</samp>’, but if the user uses the ‘<samp>-EL</samp>’ command line
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option, the output file will be created in the ‘<samp>elf32-littlemips</samp>’
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format.
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</p>
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</dd>
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<dt><code>TARGET(<var>bfdname</var>)</code></dt>
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<dd><a name="index-TARGET_0028bfdname_0029"></a>
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<a name="index-input-file-format-in-linker-script"></a>
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<p>The <code>TARGET</code> command names the BFD format to use when reading input
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files. It affects subsequent <code>INPUT</code> and <code>GROUP</code> commands.
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This command is like using ‘<samp>-b <var>bfdname</var></samp>’ on the command line
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(see <a href="Options.html#Options">Command Line Options</a>). If the <code>TARGET</code> command
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is used but <code>OUTPUT_FORMAT</code> is not, then the last <code>TARGET</code>
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command is also used to set the format for the output file. See <a href="BFD.html#BFD">BFD</a>.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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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>
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</div>
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</body>
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</html>
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