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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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| <a name="Including-Patterns-in-Machine-Descriptions_002e"></a> |
| <h3 class="section">16.17 Including Patterns in Machine Descriptions.</h3> |
| <a name="index-insn-includes"></a> |
| |
| <a name="index-include"></a> |
| <p>The <code>include</code> pattern tells the compiler tools where to |
| look for patterns that are in files other than in the file |
| <samp>.md</samp>. This is used only at build time and there is no preprocessing allowed. |
| </p> |
| <p>It looks like: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"> |
| (include |
| <var>pathname</var>) |
| </pre></div> |
| |
| <p>For example: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"> |
| (include "filestuff") |
| |
| </pre></div> |
| |
| <p>Where <var>pathname</var> is a string that specifies the location of the file, |
| specifies the include file to be in <samp>gcc/config/target/filestuff</samp>. The |
| directory <samp>gcc/config/target</samp> is regarded as the default directory. |
| </p> |
| |
| <p>Machine descriptions may be split up into smaller more manageable subsections |
| and placed into subdirectories. |
| </p> |
| <p>By specifying: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"> |
| (include "BOGUS/filestuff") |
| |
| </pre></div> |
| |
| <p>the include file is specified to be in <samp>gcc/config/<var>target</var>/BOGUS/filestuff</samp>. |
| </p> |
| <p>Specifying an absolute path for the include file such as; |
| </p><div class="smallexample"> |
| <pre class="smallexample"> |
| (include "/u2/BOGUS/filestuff") |
| |
| </pre></div> |
| <p>is permitted but is not encouraged. |
| </p> |
| <a name="RTL-Generation-Tool-Options-for-Directory-Search"></a> |
| <h4 class="subsection">16.17.1 RTL Generation Tool Options for Directory Search</h4> |
| <a name="index-directory-options-_002emd"></a> |
| <a name="index-options_002c-directory-search"></a> |
| <a name="index-search-options"></a> |
| |
| <p>The <samp>-I<var>dir</var></samp> option specifies directories to search for machine descriptions. |
| For example: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"> |
| genrecog -I/p1/abc/proc1 -I/p2/abcd/pro2 target.md |
| |
| </pre></div> |
| |
| |
| <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>-I</samp> option, the directories are scanned in left-to-right |
| order; the standard default directory come after. |
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