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toolchain-gcc-arm-embedded/share/doc/gcc-arm-none-eabi/html/ld.html/Format-Commands.html

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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

  3. <!-- This file documents the GNU linker LD

  4. (GNU Arm Embedded Toolchain 10-2020-q4-major)

  5. version 2.35.1.

  6. 

  7. Copyright (C) 1991-2020 Free Software Foundation, Inc.

  8. 

  9. Permission is granted to copy, distribute and/or modify this document

  10. under the terms of the GNU Free Documentation License, Version 1.3

  11. or any later version published by the Free Software Foundation;

  12. with no Invariant Sections, with no Front-Cover Texts, and with no

  13. Back-Cover Texts.  A copy of the license is included in the

  14. section entitled "GNU Free Documentation License". -->

  15. <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->

  16. <head>

  17. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  18. <title>Format Commands (LD)</title>

  19. 

  20. <meta name="description" content="Format Commands (LD)">

  21. <meta name="keywords" content="Format Commands (LD)">

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  25. <link href="index.html#Top" rel="start" title="Top">

  26. <link href="LD-Index.html#LD-Index" rel="index" title="LD Index">

  27. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  28. <link href="Simple-Commands.html#Simple-Commands" rel="up" title="Simple Commands">

  29. <link href="REGION_005fALIAS.html#REGION_005fALIAS" rel="next" title="REGION_ALIAS">

  30. <link href="File-Commands.html#File-Commands" rel="prev" title="File Commands">

  31. <style type="text/css">

  32. <!--

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  58. 

  59. 

  60. </head>

  61. 

  62. <body lang="en">

  63. <a name="Format-Commands"></a>

  64. <div class="header">

  65. <p>

  66. 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> &nbsp; [<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>

  67. </div>

  68. <hr>

  69. <a name="Commands-Dealing-with-Object-File-Formats"></a>

  70. <h4 class="subsection">3.4.3 Commands Dealing with Object File Formats</h4>

  71. <p>A couple of linker script commands deal with object file formats.

  72. </p>

  73. <dl compact="compact">

  74. <dt><code>OUTPUT_FORMAT(<var>bfdname</var>)</code></dt>

  75. <dt><code>OUTPUT_FORMAT(<var>default</var>, <var>big</var>, <var>little</var>)</code></dt>

  76. <dd><a name="index-OUTPUT_005fFORMAT_0028bfdname_0029"></a>

  77. <a name="index-output-file-format-in-linker-script"></a>

  78. <p>The <code>OUTPUT_FORMAT</code> command names the BFD format to use for the

  79. output file (see <a href="BFD.html#BFD">BFD</a>).  Using <code>OUTPUT_FORMAT(<var>bfdname</var>)</code> is

  80. exactly like using &lsquo;<samp>--oformat <var>bfdname</var></samp>&rsquo; on the command line

  81. (see <a href="Options.html#Options">Command-line Options</a>).  If both are used, the command

  82. line option takes precedence.

  83. </p>

  84. <p>You can use <code>OUTPUT_FORMAT</code> with three arguments to use different

  85. formats based on the &lsquo;<samp>-EB</samp>&rsquo; and &lsquo;<samp>-EL</samp>&rsquo; command-line options.

  86. This permits the linker script to set the output format based on the

  87. desired endianness.

  88. </p>

  89. <p>If neither &lsquo;<samp>-EB</samp>&rsquo; nor &lsquo;<samp>-EL</samp>&rsquo; are used, then the output format

  90. will be the first argument, <var>default</var>.  If &lsquo;<samp>-EB</samp>&rsquo; is used, the

  91. output format will be the second argument, <var>big</var>.  If &lsquo;<samp>-EL</samp>&rsquo; is

  92. used, the output format will be the third argument, <var>little</var>.

  93. </p>

  94. <p>For example, the default linker script for the MIPS ELF target uses this

  95. command:

  96. </p><div class="smallexample">

  97. <pre class="smallexample">OUTPUT_FORMAT(elf32-bigmips, elf32-bigmips, elf32-littlemips)

  98. </pre></div>

  99. <p>This says that the default format for the output file is

  100. &lsquo;<samp>elf32-bigmips</samp>&rsquo;, but if the user uses the &lsquo;<samp>-EL</samp>&rsquo; command-line

  101. option, the output file will be created in the &lsquo;<samp>elf32-littlemips</samp>&rsquo;

  102. format.

  103. </p>

  104. </dd>

  105. <dt><code>TARGET(<var>bfdname</var>)</code></dt>

  106. <dd><a name="index-TARGET_0028bfdname_0029"></a>

  107. <a name="index-input-file-format-in-linker-script"></a>

  108. <p>The <code>TARGET</code> command names the BFD format to use when reading input

  109. files.  It affects subsequent <code>INPUT</code> and <code>GROUP</code> commands.

  110. This command is like using &lsquo;<samp>-b <var>bfdname</var></samp>&rsquo; on the command line

  111. (see <a href="Options.html#Options">Command-line Options</a>).  If the <code>TARGET</code> command

  112. is used but <code>OUTPUT_FORMAT</code> is not, then the last <code>TARGET</code>

  113. command is also used to set the format for the output file.  See <a href="BFD.html#BFD">BFD</a>.

  114. </p></dd>

  115. </dl>

  116. 

  117. <hr>

  118. <div class="header">

  119. <p>

  120. 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> &nbsp; [<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>

  121. </div>

  122. 

  123. 

  124. 

  125. </body>

  126. </html>