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<div class="titlepage"><div><div><h2 class="title">
<a name="bbv2.tutorial"></a>Chapter 23. Tutorial</h2></div></div></div>
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<p><b>Table of Contents</b></p>
<dl>
<dt><span class="section"><a href="tutorial.html#bbv2.tutorial.hello">Hello, world</a></span></dt>
<dt><span class="section"><a href="tutorial/properties.html">Properties</a></span></dt>
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<dt><span class="section"><a href="tutorial/properties.html#bbv2.tutorial.properties.requirements">Build Requests and Target Requirements</a></span></dt>
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<dt><span class="section"><a href="tutorial/linkage.html">Static and shared libaries</a></span></dt>
<dt><span class="section"><a href="tutorial/conditions.html">Conditions and alternatives</a></span></dt>
<dt><span class="section"><a href="tutorial/prebuilt.html">Prebuilt targets</a></span></dt>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="bbv2.tutorial.hello"></a>Hello, world</h2></div></div></div>
<p>The simplest project that Boost.Build can construct is
      stored in <code class="filename">example/hello/</code> directory. The
      project is described by a file
      called <code class="filename">Jamroot</code> that contains:

</p>
<pre class="programlisting">
exe hello : hello.cpp ;
</pre>
<p>

      Even with this simple setup, you can do some interesting
      things. First of all, just invoking <span><strong class="command">bjam</strong></span> will
      build the <code class="filename">hello</code>
      executable by compiling and
      linking <code class="filename">hello.cpp</code>. By default, debug variant 
      is built. Now, to build the
      release variant of <code class="filename">hello</code>, invoke 

</p>
<pre class="screen">
bjam release
</pre>
<p>

      Note that debug and release variants are created in different
      directories, so you can switch between variants or even build
      multiple variants at once, without any unnecessary
      recompilation. Let's extend the example by adding another line
      to our project's <code class="filename">Jamroot</code>:

</p>
<pre class="programlisting">
exe hello2 : hello.cpp ;
</pre>
<p>

      Now let us build both the debug and release variants of our project
      again:

</p>
<pre class="screen">
bjam debug release
</pre>
<p>

      Note that two variants of <code class="filename">hello2</code> are linked.
      Since we have already built both variants
      of <code class="filename">hello</code>, hello.cpp won't be recompiled;
      instead the existing object files will just be linked into the
      corresponding variants of <code class="filename">hello2</code>. Now 
      let's remove all the built products:

</p>
<pre class="screen">
bjam --clean debug release
</pre>
<p>

      It's also possible to build or clean specific targets.  The
      following two commands, respectively, build or clean only the
      debug version of <code class="filename">hello2</code>.

</p>
<pre class="screen">
bjam hello2
bjam --clean hello2
</pre>
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