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core/com.nokia.carbide.cpp.compiler.doc.user/html/performance/perf_precompiled_using.htm
author fturovic <frank.turovich@nokia.com>
Mon, 19 Jul 2010 16:13:24 -0500
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"><html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
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<meta http-equiv="Content-Style-Type" content="text/css" />
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<meta name="LASTUPDATED" content="06/17/05 11:09:43" />
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<title>Using a Precompiled Header File</title>
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<link rel="StyleSheet" href="../../book.css" type="text/css"/>
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</head>
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<body bgcolor="#FFFFFF">
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<h3>Using a Precompiled Header File</h3>
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<p>Although a precompiled file is not a text file, you use it like you would a regular header file. To include a precompiled header file in a source code file, use the <span class="code">#include</span> directive.</p>
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<p class="note"><strong>NOTE</strong> Unlike regular header files in text format, a source code file may include only one precompiled file.</p>
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<p class="note"><strong>TIP</strong> Instead of explicitly including a precompiled file in each source code file with the<span class="code"> #include</span> directive, put the precompiled file name in the Prefix File field of the C/C++ Language settings panel. If the Prefix File field already specifies a file name, include the precompiled file in the prefix file with the <span class="code">#include</span> directive.</p>
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<p>Listing 5.1 and Listing 5.2 show an example.</p>
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<div class="listing">
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  <h5>Listing 5.1 Header File that Creates a Precompiled Header File for C</h5>
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  <p>// sock_header.pch<br />
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    // When compiled or precompiled, this file will generate a <br />
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    // precompiled file named &quot;sock_precomp.mch&quot;</p>
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  <p>#pragma precompile_target &quot;sock_precomp.mch&quot;</p>
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  <p>#define SOCK_VERSION &quot;SockSorter 2.0&quot;<br />
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    #include &quot;sock_std.h&quot;<br />
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    #include &quot;sock_string.h&quot;<br />
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    #include &quot;sock_sorter.h&quot;</p>
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</div>
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<div class="listing">
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  <h5>Listing 5.2 Using a Precompiled File</h5>
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  <p>// sock_main.c<br />
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    // Instead of including all the files included in <br />
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    // sock_header.pch, we use sock_precomp.h instead.<br />
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    //<br />
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    // A precompiled file must be included before anything else.</p>
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  <p>#include &quot;sock_precomp.mch&quot;</p>
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  <p>int main(void)<br />
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    {<br />
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    // ...<br />
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    return 0;<br />
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    }
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  </p>
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</div>
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<div id="footer">Copyright &copy; 2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. <br>License: <a href="http://www.eclipse.org/legal/epl-v10.html">http://www.eclipse.org/legal/epl-v10.html</a></div>
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FCL/sftools/dev/ide/carbidecpp