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<title>How to change compilation flags for one file?
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="id2580291"></a>How to change compilation flags for one file?
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<p>If one file must be compiled with special options, you need to
explicitly declare an <code class="computeroutput">obj</code> target for that file and then use
that target in your <code class="computeroutput">exe</code> or <code class="computeroutput">lib</code> target:
</p>
<pre class="programlisting">
exe a : a.cpp b ;
obj b : b.cpp : <optimization>off ;
</pre>
<p>
Of course you can use other properties, for example to specify specific
compiler options:
</p>
<pre class="programlisting">
exe a : a.cpp b ;
obj b : b.cpp : <cflags>-g ;
</pre>
<p>
You can also use <a href="../tutorial/conditions.html" title="Conditions and alternatives">conditional
properties</a> for finer control:
</p>
<pre class="programlisting">
exe a : a.cpp b ;
obj b : b.cpp : <variant>release:<optimization>off ;
</pre>
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