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| <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> |
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