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<h3 class="section">16.17 Including Patterns in Machine Descriptions.</h3>
<p><a name="index-insn-includes-3706"></a>
<a name="index-include-3707"></a>The <code>include</code> pattern tells the compiler tools where to
look for patterns that are in files other than in the file
<samp><span class="file">.md</span></samp>. This is used only at build time and there is no preprocessing allowed.
<p>It looks like:
<pre class="smallexample">
(include
<var>pathname</var>)
</pre>
<p>For example:
<pre class="smallexample">
(include "filestuff")
</pre>
<p>Where <var>pathname</var> is a string that specifies the location of the file,
specifies the include file to be in <samp><span class="file">gcc/config/target/filestuff</span></samp>. The
directory <samp><span class="file">gcc/config/target</span></samp> is regarded as the default directory.
<p>Machine descriptions may be split up into smaller more manageable subsections
and placed into subdirectories.
<p>By specifying:
<pre class="smallexample">
(include "BOGUS/filestuff")
</pre>
<p>the include file is specified to be in <samp><span class="file">gcc/config/</span><var>target</var><span class="file">/BOGUS/filestuff</span></samp>.
<p>Specifying an absolute path for the include file such as;
<pre class="smallexample">
(include "/u2/BOGUS/filestuff")
</pre>
<p>is permitted but is not encouraged.
<h4 class="subsection">16.17.1 RTL Generation Tool Options for Directory Search</h4>
<p><a name="index-directory-options-_002emd-3708"></a><a name="index-options_002c-directory-search-3709"></a><a name="index-search-options-3710"></a>
The <samp><span class="option">-I</span><var>dir</var></samp> option specifies directories to search for machine descriptions.
For example:
<pre class="smallexample">
genrecog -I/p1/abc/proc1 -I/p2/abcd/pro2 target.md
</pre>
<p>Add the directory <var>dir</var> to the head of the list of directories to be
searched for header files. This can be used to override a system machine definition
file, substituting your own version, since these directories are
searched before the default machine description file directories. If you use more than
one <samp><span class="option">-I</span></samp> option, the directories are scanned in left-to-right
order; the standard default directory come after.
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