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+<title>Precompiled Headers </title>
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+<h2>Precompiled Headers </h2>
+<p>Precompiled header support is available for Symbian OS projects that use the Nokia x86
+compiler. Precompiled header files use the <span class="code">.pch++ </span>extension and are only supported by emulator targets. </p>
+<p>By default, the x86 compiler compiles the <span class="code">.pch++</span> file before compiling any <span class="code">.cpp</span> files in a project. </p>
+<p>A precompiled header file (<span class="code">.pch++</span>) outputs to a new identically named file with the <span class="code">.mch</span> extension. For example, <span class="code">HelloWorld.pch++</span> outputs as <span class="code">HelloWorld.mch</span>. C++ source files must use the <span class="code">.pch++</span> extension.</p>
+<p>Listing 1 shows an example of a precompiled header source file called
+<span class="code">pch_test.pch++</span>.</p>
+<div class="listing">
+ <h4>Listing 1 .pch Precompiled Header example</h4>
+ <p class="listing">#include <e32def.h><br />
+ #pragma precompile_target "pch_test.mch"<br />
+ <br />
+ #define FOO 1<br />
+ #define LATIDA 345</p>
+ <p class="listing">typedef struct foo<br />
+ {<br />
+ int i, j, k, l, m;<br />
+ char foobar[256];<br />
+} foo;</p>
+</div>
+<p>The resultant output file, <span class="code">pch_test.mch</span> can be included in other source or prefix files as:</p>
+<p class="listing"> #include pch_test.mch</p>
+<p> </p>
+<div id="footer">Copyright © 2009 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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