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79 lines
3.3 KiB
HTML
79 lines
3.3 KiB
HTML
4 years ago
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<html lang="en">
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<title>Linkonce - Using as</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Using as">
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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="Pseudo-Ops.html#Pseudo-Ops" title="Pseudo Ops">
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<link rel="next" href="List.html#List" title="List">
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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 Assembler "as".
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Copyright (C) 1991-2015 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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pre.display { font-family:inherit }
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pre.smallformat { font-family:inherit; font-size:smaller }
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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="Linkonce"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="List.html#List">List</a>,
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Previous: <a rel="previous" accesskey="p" href="Line.html#Line">Line</a>,
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Up: <a rel="up" accesskey="u" href="Pseudo-Ops.html#Pseudo-Ops">Pseudo Ops</a>
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<hr>
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</div>
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<h3 class="section">7.51 <code>.linkonce [</code><var>type</var><code>]</code></h3>
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<p><a name="index-COMDAT-390"></a><a name="index-g_t_0040code_007blinkonce_007d-directive-391"></a><a name="index-common-sections-392"></a>Mark the current section so that the linker only includes a single copy of it.
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This may be used to include the same section in several different object files,
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but ensure that the linker will only include it once in the final output file.
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The <code>.linkonce</code> pseudo-op must be used for each instance of the section.
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Duplicate sections are detected based on the section name, so it should be
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unique.
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<p>This directive is only supported by a few object file formats; as of this
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writing, the only object file format which supports it is the Portable
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Executable format used on Windows NT.
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<p>The <var>type</var> argument is optional. If specified, it must be one of the
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following strings. For example:
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<pre class="smallexample"> .linkonce same_size
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</pre>
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<p>Not all types may be supported on all object file formats.
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<dl>
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<dt><code>discard</code><dd>Silently discard duplicate sections. This is the default.
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<br><dt><code>one_only</code><dd>Warn if there are duplicate sections, but still keep only one copy.
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<br><dt><code>same_size</code><dd>Warn if any of the duplicates have different sizes.
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<br><dt><code>same_contents</code><dd>Warn if any of the duplicates do not have exactly the same contents.
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</dl>
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</body></html>
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