88 lines
5.1 KiB
HTML
88 lines
5.1 KiB
HTML
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<html lang="en">
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<head>
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<title>Format Commands - Untitled</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Untitled">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Simple-Commands.html#Simple-Commands" title="Simple Commands">
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<link rel="prev" href="File-Commands.html#File-Commands" title="File Commands">
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<link rel="next" href="REGION_005fALIAS.html#REGION_005fALIAS" title="REGION_ALIAS">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU linker LD
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(GNU Toolchain for the A-profile Architecture 9.2-2019.12 (arm-9.10))
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version 2.33.1.
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Copyright (C) 1991-2019 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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<style type="text/css"><!--
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Format-Commands"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="REGION_005fALIAS.html#REGION_005fALIAS">REGION_ALIAS</a>,
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Previous: <a rel="previous" accesskey="p" href="File-Commands.html#File-Commands">File Commands</a>,
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Up: <a rel="up" accesskey="u" href="Simple-Commands.html#Simple-Commands">Simple Commands</a>
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<hr>
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</div>
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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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<dl>
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<dt><code>OUTPUT_FORMAT(</code><var>bfdname</var><code>)</code><dt><code>OUTPUT_FORMAT(</code><var>default</var><code>, </code><var>big</var><code>, </code><var>little</var><code>)</code><dd><a name="index-OUTPUT_005fFORMAT_0028_0040var_007bbfdname_007d_0029-415"></a><a name="index-output-file-format-in-linker-script-416"></a>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(</code><var>bfdname</var><code>)</code> is
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exactly like using ‘<samp><span class="samp">--oformat </span><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>You can use <code>OUTPUT_FORMAT</code> with three arguments to use different
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formats based on the ‘<samp><span class="samp">-EB</span></samp>’ and ‘<samp><span class="samp">-EL</span></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>If neither ‘<samp><span class="samp">-EB</span></samp>’ nor ‘<samp><span class="samp">-EL</span></samp>’ are used, then the output format
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will be the first argument, <var>default</var>. If ‘<samp><span class="samp">-EB</span></samp>’ is used, the
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output format will be the second argument, <var>big</var>. If ‘<samp><span class="samp">-EL</span></samp>’ is
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used, the output format will be the third argument, <var>little</var>.
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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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<pre class="smallexample"> OUTPUT_FORMAT(elf32-bigmips, elf32-bigmips, elf32-littlemips)
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</pre>
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<p>This says that the default format for the output file is
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‘<samp><span class="samp">elf32-bigmips</span></samp>’, but if the user uses the ‘<samp><span class="samp">-EL</span></samp>’ command-line
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option, the output file will be created in the ‘<samp><span class="samp">elf32-littlemips</span></samp>’
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format.
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<br><dt><code>TARGET(</code><var>bfdname</var><code>)</code><dd><a name="index-TARGET_0028_0040var_007bbfdname_007d_0029-417"></a><a name="index-input-file-format-in-linker-script-418"></a>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><span class="samp">-b </span><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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</dl>
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</body></html>
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