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78 lines
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78 lines
3.3 KiB
HTML
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This file documents the GNU Assembler "as".
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2006, 2007 Free Software Foundation, Inc.
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<div class="node">
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<p>
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<a name="Linkonce"></a>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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<h3 class="section">7.71 <code>.linkonce [</code><var>type</var><code>]</code></h3>
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<p><a name="index-COMDAT-378"></a><a name="index-_0040code_007blinkonce_007d-directive-379"></a><a name="index-common-sections-380"></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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