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<title>Customizing the module's entry point</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_test.adv_scenarios.static_lib_customizations.entry_point"></a><a class="link" href="entry_point.html" title="Customizing the module's entry point">Customizing
        the module's entry point</a>
</h4></div></div></div>
<p>
          In the static library variant, customizing the main entry point is quite
          troublesome, because the definition of function <code class="computeroutput"><span class="identifier">main</span></code>
          is already compiled into the static library. This requires you to rebuild
          the <span class="emphasis"><em>Unit Test Framework</em></span> static library with the defined
          symbol <a class="link" href="../../utf_reference/link_references/link_boost_test_no_main.html" title="BOOST_TEST_NO_MAIN"><code class="computeroutput"><span class="identifier">BOOST_TEST_NO_MAIN</span></code></a>. In the Boost
          root directory you need to invoke command
        </p>
<pre class="programlisting"><span class="special">&gt;</span> <span class="identifier">b2</span> <span class="special">--</span><span class="identifier">with</span><span class="special">-</span><span class="identifier">test</span> <span class="identifier">link</span><span class="special">=</span><span class="keyword">static</span> <span class="identifier">define</span><span class="special">=</span><a class="link" href="../../utf_reference/link_references/link_boost_test_no_main.html" title="BOOST_TEST_NO_MAIN"><code class="computeroutput"><span class="identifier">BOOST_TEST_NO_MAIN</span></code></a> <span class="identifier">define</span><span class="special">=</span><a class="link" href="../../utf_reference/link_references/link_boost_test_alternative_init_macro.html" title="BOOST_TEST_ALTERNATIVE_INIT_API"><code class="computeroutput"><span class="identifier">BOOST_TEST_ALTERNATIVE_INIT_API</span></code></a> <span class="identifier">install</span>
</pre>
<div class="warning"><table border="0" summary="Warning">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="../../../../../../../doc/src/images/warning.png"></td>
<th align="left">Warning</th>
</tr>
<tr><td align="left" valign="top"><p>
            This removal of entry point definition from the static library will affect
            everybody else who is linking against the library. It may be less intrusive
            to switch to the <a class="link" href="../shared_lib_customizations.html" title="Shared-library variant customizations">shared
            library usage variant</a> instead.
          </p></td></tr>
</table></div>
<p>
          In one of the source files, you now have to define your custom entry point,
          and invoke the default <a class="link" href="../test_module_runner_overview.html" title="Test module runner">test
          runner</a> <code class="computeroutput"><span class="identifier">unit_test_main</span></code>
          manually with the default <a class="link" href="../test_module_init_overview.html" title="Test module's initialization">initialization
          function</a> <code class="computeroutput"><span class="identifier">init_unit_test</span></code>
          as the first argument. There is no need to define <a class="link" href="../../utf_reference/link_references/link_boost_test_no_main.html" title="BOOST_TEST_NO_MAIN"><code class="computeroutput"><span class="identifier">BOOST_TEST_NO_MAIN</span></code></a> in your source
          code, but you need to define <a class="link" href="../../utf_reference/link_references/link_boost_test_alternative_init_macro.html" title="BOOST_TEST_ALTERNATIVE_INIT_API"><code class="computeroutput"><span class="identifier">BOOST_TEST_ALTERNATIVE_INIT_API</span></code></a>
          in the main file:
        </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                  <p>
                    In <span class="bold"><strong>exactly one</strong></span> file
                  </p>
                </th>
<th>
                  <p>
                    In all other files
                  </p>
                </th>
</tr></thead>
<tbody><tr>
<td>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_TEST_MODULE</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="identifier">name</span>
<span class="preprocessor">#define</span> <span class="identifier">BOOST_TEST_ALTERNATIVE_INIT_API</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>

<span class="comment">// entry point:</span>
<span class="keyword">int</span> <span class="identifier">main</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">argc</span><span class="special">,</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">argv</span><span class="special">[],</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">envp</span><span class="special">[])</span>
<span class="special">{</span>
  <span class="keyword">return</span> <span class="identifier">utf</span><span class="special">::</span><span class="identifier">unit_test_main</span><span class="special">(</span><span class="identifier">init_unit_test</span><span class="special">,</span> <span class="identifier">argc</span><span class="special">,</span> <span class="identifier">argv</span><span class="special">);</span>
<span class="special">}</span>
</pre>
                </td>
<td>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>

<span class="comment">//</span>
<span class="comment">// test cases</span>
<span class="comment">//</span>

<span class="comment">//</span>
<span class="comment">// test cases</span>
<span class="comment">//</span>
</pre>
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<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
            The reason for defining <a class="link" href="../../utf_reference/link_references/link_boost_test_alternative_init_macro.html" title="BOOST_TEST_ALTERNATIVE_INIT_API"><code class="computeroutput"><span class="identifier">BOOST_TEST_ALTERNATIVE_INIT_API</span></code></a>
            is described <a class="link" href="../obsolete_init_func.html" title="The obsolete initialization function">here</a>.
          </p></td></tr>
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