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<a name="Plugins-building"></a>
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Previous: <a href="Plugins-tracking.html#Plugins-tracking" accesskey="p" rel="prev">Plugins tracking</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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<hr>
<a name="Building-GCC-plugins"></a>
<h3 class="section">23.10 Building GCC plugins</h3>

<p>If plugins are enabled, GCC installs the headers needed to build a
plugin (somewhere in the installation tree, e.g. under
<samp>/usr/local</samp>).  In particular a <samp>plugin/include</samp> directory
is installed, containing all the header files needed to build plugins.
</p>
<p>On most systems, you can query this <code>plugin</code> directory by
invoking <code>gcc -print-file-name=plugin</code> (replace if needed
<code>gcc</code> with the appropriate program path).
</p>
<p>Inside plugins, this <code>plugin</code> directory name can be queried by
calling <code>default_plugin_dir_name ()</code>.
</p>
<p>Plugins may know, when they are compiled, the GCC version for which
<samp>plugin-version.h</samp> is provided.  The constant macros
<code>GCCPLUGIN_VERSION_MAJOR</code>, <code>GCCPLUGIN_VERSION_MINOR</code>,
<code>GCCPLUGIN_VERSION_PATCHLEVEL</code>, <code>GCCPLUGIN_VERSION</code> are
integer numbers, so a plugin could ensure it is built for GCC 4.7 with 
</p><div class="smallexample">
<pre class="smallexample">#if GCCPLUGIN_VERSION != 4007
#error this GCC plugin is for GCC 4.7
#endif
</pre></div>

<p>The following GNU Makefile excerpt shows how to build a simple plugin:
</p>
<div class="smallexample">
<pre class="smallexample">HOST_GCC=g++
TARGET_GCC=gcc
PLUGIN_SOURCE_FILES= plugin1.c plugin2.cc
GCCPLUGINS_DIR:= $(shell $(TARGET_GCC) -print-file-name=plugin)
CXXFLAGS+= -I$(GCCPLUGINS_DIR)/include -fPIC -fno-rtti -O2

plugin.so: $(PLUGIN_SOURCE_FILES)
   $(HOST_GCC) -shared $(CXXFLAGS) $^ -o $@
</pre></div>

<p>A single source file plugin may be built with <code>g++ -I`gcc
-print-file-name=plugin`/include -fPIC -shared -fno-rtti -O2 plugin.c -o
plugin.so</code>, using backquote shell syntax to query the <samp>plugin</samp>
directory.
</p>
<p>When a plugin needs to use <code>gengtype</code>, be sure that both
<samp>gengtype</samp> and <samp>gtype.state</samp> have the same version as the
GCC for which the plugin is built.
</p>


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