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115 lines
4.7 KiB
HTML
115 lines
4.7 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>Including Patterns - GNU Compiler Collection (GCC) Internals</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Machine-Desc.html#Machine-Desc" title="Machine Desc">
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<link rel="prev" href="Insn-Splitting.html#Insn-Splitting" title="Insn Splitting">
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<link rel="next" href="Peephole-Definitions.html#Peephole-Definitions" title="Peephole Definitions">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``Funding Free Software'', the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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funds for GNU development.-->
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Including-Patterns"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Peephole-Definitions.html#Peephole-Definitions">Peephole Definitions</a>,
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Previous: <a rel="previous" accesskey="p" href="Insn-Splitting.html#Insn-Splitting">Insn Splitting</a>,
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Up: <a rel="up" accesskey="u" href="Machine-Desc.html#Machine-Desc">Machine Desc</a>
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<hr>
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</div>
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<h3 class="section">16.17 Including Patterns in Machine Descriptions.</h3>
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<p><a name="index-insn-includes-3706"></a>
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<a name="index-include-3707"></a>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><span class="file">.md</span></samp>. This is used only at build time and there is no preprocessing allowed.
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<p>It looks like:
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<pre class="smallexample">
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(include
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<var>pathname</var>)
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</pre>
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<p>For example:
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<pre class="smallexample">
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(include "filestuff")
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</pre>
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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><span class="file">gcc/config/target/filestuff</span></samp>. The
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directory <samp><span class="file">gcc/config/target</span></samp> is regarded as the default directory.
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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>By specifying:
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<pre class="smallexample">
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(include "BOGUS/filestuff")
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</pre>
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<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>.
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<p>Specifying an absolute path for the include file such as;
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<pre class="smallexample">
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(include "/u2/BOGUS/filestuff")
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</pre>
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<p>is permitted but is not encouraged.
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<h4 class="subsection">16.17.1 RTL Generation Tool Options for Directory Search</h4>
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<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>
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The <samp><span class="option">-I</span><var>dir</var></samp> option specifies directories to search for machine descriptions.
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For example:
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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>
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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><span class="option">-I</span></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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</body></html>
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