| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- This file documents the GNU Assembler "as". |
| |
| Copyright (C) 1991-2014 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>Using as: Linkonce</title> |
| |
| <meta name="description" content="Using as: Linkonce"> |
| <meta name="keywords" content="Using as: Linkonce"> |
| <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="AS-Index.html#AS-Index" rel="index" title="AS Index"> |
| <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> |
| <link href="Pseudo-Ops.html#Pseudo-Ops" rel="up" title="Pseudo Ops"> |
| <link href="List.html#List" rel="next" title="List"> |
| <link href="Line.html#Line" rel="prev" title="Line"> |
| <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="Linkonce"></a> |
| <div class="header"> |
| <p> |
| Next: <a href="List.html#List" accesskey="n" rel="next">List</a>, Previous: <a href="Line.html#Line" accesskey="p" rel="prev">Line</a>, Up: <a href="Pseudo-Ops.html#Pseudo-Ops" accesskey="u" rel="up">Pseudo Ops</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
| </div> |
| <hr> |
| <a name="g_t_002elinkonce-_005btype_005d"></a> |
| <h3 class="section">7.72 <code>.linkonce [<var>type</var>]</code></h3> |
| <a name="index-COMDAT"></a> |
| <a name="index-linkonce-directive"></a> |
| <a name="index-common-sections"></a> |
| <p>Mark the current section so that the linker only includes a single copy of it. |
| This may be used to include the same section in several different object files, |
| but ensure that the linker will only include it once in the final output file. |
| The <code>.linkonce</code> pseudo-op must be used for each instance of the section. |
| Duplicate sections are detected based on the section name, so it should be |
| unique. |
| </p> |
| <p>This directive is only supported by a few object file formats; as of this |
| writing, the only object file format which supports it is the Portable |
| Executable format used on Windows NT. |
| </p> |
| <p>The <var>type</var> argument is optional. If specified, it must be one of the |
| following strings. For example: |
| </p><div class="smallexample"> |
| <pre class="smallexample">.linkonce same_size |
| </pre></div> |
| <p>Not all types may be supported on all object file formats. |
| </p> |
| <dl compact="compact"> |
| <dt><code>discard</code></dt> |
| <dd><p>Silently discard duplicate sections. This is the default. |
| </p> |
| </dd> |
| <dt><code>one_only</code></dt> |
| <dd><p>Warn if there are duplicate sections, but still keep only one copy. |
| </p> |
| </dd> |
| <dt><code>same_size</code></dt> |
| <dd><p>Warn if any of the duplicates have different sizes. |
| </p> |
| </dd> |
| <dt><code>same_contents</code></dt> |
| <dd><p>Warn if any of the duplicates do not have exactly the same contents. |
| </p></dd> |
| </dl> |
| |
| |
| |
| |
| </body> |
| </html> |
