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Next: <a href="Plugin-API.html#Plugin-API" accesskey="n" rel="next">Plugin API</a>, Up: <a href="Plugins.html#Plugins" accesskey="u" rel="up">Plugins</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Loading-Plugins"></a>
<h3 class="section">24.1 Loading Plugins</h3>

<p>Plugins are supported on platforms that support <samp>-ldl
-rdynamic</samp> as well as Windows/MinGW. They are loaded by the compiler
using <code>dlopen</code> or equivalent and invoked at pre-determined
locations in the compilation process.
</p>
<p>Plugins are loaded with
</p>
<p><samp>-fplugin=/path/to/<var>name</var>.<var>ext</var></samp> <samp>-fplugin-arg-<var>name</var>-<var>key1</var>[=<var>value1</var>]</samp>
</p>
<p>Where <var>name</var> is the plugin name and <var>ext</var> is the platform-specific
dynamic library extension. It should be <code>dll</code> on Windows/MinGW,
<code>dylib</code> on Darwin/Mac OS X, and <code>so</code> on all other platforms.
The plugin arguments are parsed by GCC and passed to respective
plugins as key-value pairs. Multiple plugins can be invoked by
specifying multiple <samp>-fplugin</samp> arguments.
</p>
<p>A plugin can be simply given by its short name (no dots or
slashes). When simply passing <samp>-fplugin=<var>name</var></samp>, the plugin is
loaded from the <samp>plugin</samp> directory, so <samp>-fplugin=<var>name</var></samp> is
the same as <samp>-fplugin=`gcc -print-file-name=plugin`/<var>name</var>.<var>ext</var></samp>,
using backquote shell syntax to query the <samp>plugin</samp> directory.
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