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3.1 KiB
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17 lines
3.1 KiB
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Chapter 3. Preprocessor configurations</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.1"><link rel="home" href="index.html" title="Cppcheck 1.44"><link rel="up" href="index.html" title="Cppcheck 1.44"><link rel="prev" href="ch02s08.html" title="Multithreaded checking"><link rel="next" href="ch04.html" title="Chapter 4. XML output"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 3. Preprocessor configurations</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch02s08.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="ch04.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter 3. Preprocessor configurations"><div class="titlepage"><div><div><h2 class="title"><a name="id2588374"></a>Chapter 3. Preprocessor configurations</h2></div></div></div><p>By default Cppcheck will check all preprocessor configurations
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(except those that has #error in them). This is the recommended
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behaviour.</p><p>But if you want to manually limit the checking you can do so with
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<code class="literal">-D</code>.</p><p>Beware that only the macros, which are given here and the macros
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defined in source files and known header files are considered. That
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excludes all the macros defined in some system header files, which are by
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default not examined by cppcheck.</p><p>The usage: if you, for example, want to limit the checking so the
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only configuration to check should be "DEBUG=1;__cplusplus" then something
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like this can be used:</p><pre class="programlisting">cppcheck -DDEBUG=1 -D__cplusplus path</pre><p>An alternative for -D is to use #error.</p><pre class="programlisting">#if LIB_VERSION <= 3
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#error "lib version must be greater than 3"
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#endif</pre><p>Using #error instead of -D have some advantages:</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>the compiler will not be able to compile the code when invalid
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defines are given. So #error makes your source code
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safer/better.</p></li><li class="listitem"><p>Cppcheck will check all valid configurations instead of a single
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configuration.</p></li><li class="listitem"><p>This information is added to the source code which means you
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don't need to provide this information to Cppcheck (makes it simpler
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to use Cppcheck)</p></li></ul></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch02s08.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="ch04.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Multithreaded checking </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 4. XML output</td></tr></table></div></body></html>
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