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<title>GNU Compiler Collection (GCC) Internals: Including Patterns</title>
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<a name="Including-Patterns"></a>
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<div class="header">
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<p>
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Next: <a href="Peephole-Definitions.html#Peephole-Definitions" accesskey="n" rel="next">Peephole Definitions</a>, Previous: <a href="Insn-Splitting.html#Insn-Splitting" accesskey="p" rel="prev">Insn Splitting</a>, Up: <a href="Machine-Desc.html#Machine-Desc" accesskey="u" rel="up">Machine Desc</a> [<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>
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<a name="Including-Patterns-in-Machine-Descriptions_002e"></a>
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<h3 class="section">16.17 Including Patterns in Machine Descriptions.</h3>
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<a name="index-insn-includes"></a>
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<a name="index-include"></a>
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<p>The <code>include</code> pattern tells the compiler tools where to
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look for patterns that are in files other than in the file
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<samp>.md</samp>. This is used only at build time and there is no preprocessing allowed.
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</p>
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<p>It looks like:
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</p>
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<div class="smallexample">
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<pre class="smallexample">
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(include
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<var>pathname</var>)
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</pre></div>
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<p>For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">
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(include "filestuff")
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</pre></div>
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<p>Where <var>pathname</var> is a string that specifies the location of the file,
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specifies the include file to be in <samp>gcc/config/target/filestuff</samp>. The
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directory <samp>gcc/config/target</samp> is regarded as the default directory.
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</p>
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<p>Machine descriptions may be split up into smaller more manageable subsections
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and placed into subdirectories.
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</p>
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<p>By specifying:
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</p>
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<div class="smallexample">
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<pre class="smallexample">
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(include "BOGUS/filestuff")
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</pre></div>
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<p>the include file is specified to be in <samp>gcc/config/<var>target</var>/BOGUS/filestuff</samp>.
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</p>
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<p>Specifying an absolute path for the include file such as;
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</p><div class="smallexample">
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<pre class="smallexample">
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(include "/u2/BOGUS/filestuff")
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</pre></div>
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<p>is permitted but is not encouraged.
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</p>
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<a name="RTL-Generation-Tool-Options-for-Directory-Search"></a>
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<h4 class="subsection">16.17.1 RTL Generation Tool Options for Directory Search</h4>
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<a name="index-directory-options-_002emd"></a>
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<a name="index-options_002c-directory-search"></a>
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<a name="index-search-options"></a>
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<p>The <samp>-I<var>dir</var></samp> option specifies directories to search for machine descriptions.
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For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">
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genrecog -I/p1/abc/proc1 -I/p2/abcd/pro2 target.md
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</pre></div>
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<p>Add the directory <var>dir</var> to the head of the list of directories to be
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searched for header files. This can be used to override a system machine definition
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file, substituting your own version, since these directories are
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searched before the default machine description file directories. If you use more than
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one <samp>-I</samp> option, the directories are scanned in left-to-right
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order; the standard default directory come after.
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</p>
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Next: <a href="Peephole-Definitions.html#Peephole-Definitions" accesskey="n" rel="next">Peephole Definitions</a>, Previous: <a href="Insn-Splitting.html#Insn-Splitting" accesskey="p" rel="prev">Insn Splitting</a>, Up: <a href="Machine-Desc.html#Machine-Desc" accesskey="u" rel="up">Machine Desc</a> [<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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