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| <section id="compiling-with-make"> |
| <span id="compiling"></span><h1>Compiling with Make<a class="headerlink" href="#compiling-with-make" title="Permalink to this heading"></a></h1> |
| <p>Now that we’ve installed Apache NuttX prerequisites and downloaded the source code, |
| we are ready to compile the source code into an executable binary file that can |
| be run on the embedded board.</p> |
| <section id="initialize-configuration"> |
| <h2>Initialize Configuration<a class="headerlink" href="#initialize-configuration" title="Permalink to this heading"></a></h2> |
| <p>The first step is to initialize NuttX configuration for a given board, based on |
| a pre-existing configuration. To list all supported configurations you can do:</p> |
| <blockquote> |
| <div><div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">cd</span><span class="w"> </span>nuttx |
| <span class="gp">$ </span>./tools/configure.sh<span class="w"> </span>-L<span class="w"> </span><span class="p">|</span><span class="w"> </span>less |
| </pre></div> |
| </div> |
| </div></blockquote> |
| <p>The output is in the format <code class="docutils literal notranslate"><span class="pre"><board</span> <span class="pre">name>:<board</span> <span class="pre">configuration></span></code>. You will see that |
| generally all boards support the <code class="docutils literal notranslate"><span class="pre">nsh</span></code> configuration which is a good starting point |
| since it enables booting into the interactive command line |
| <a class="reference internal" href="../applications/nsh/index.html"><span class="doc">NuttShell (NSH)</span></a>.</p> |
| <p>To choose a configuration you pass the <code class="docutils literal notranslate"><span class="pre"><board</span> <span class="pre">name>:<board</span> <span class="pre">configuration></span></code> option |
| to <code class="docutils literal notranslate"><span class="pre">configure.sh</span></code> and indicate your host platform, such as:</p> |
| <blockquote> |
| <div><div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">cd</span><span class="w"> </span>nuttx |
| <span class="gp">$ </span>./tools/configure.sh<span class="w"> </span>-l<span class="w"> </span>stm32f4discovery:nsh |
| </pre></div> |
| </div> |
| </div></blockquote> |
| <p>The <code class="docutils literal notranslate"><span class="pre">-l</span></code> tells use that we’re on Linux (macOS and Windows builds are |
| possible). Use the <code class="docutils literal notranslate"><span class="pre">-h</span></code> argument to see all available options.</p> |
| <p>You can then customize this configuration by using the menu based |
| configuration system with:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">cd</span><span class="w"> </span>nuttx |
| <span class="gp">$ </span>make<span class="w"> </span>menuconfig |
| </pre></div> |
| </div> |
| <p>Modifying the configuration is covered in <a class="reference internal" href="configuring.html"><span class="doc">Configuring</span></a>.</p> |
| </section> |
| <section id="build-nuttx"> |
| <h2>Build NuttX<a class="headerlink" href="#build-nuttx" title="Permalink to this heading"></a></h2> |
| <p>We can now build NuttX. To do so, you can simply run:</p> |
| <blockquote> |
| <div><div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">cd</span><span class="w"> </span>nuttx |
| <span class="gp">$ </span>make |
| </pre></div> |
| </div> |
| </div></blockquote> |
| <p>The build will complete by generating the binary outputs |
| inside <code class="docutils literal notranslate"><span class="pre">nuttx</span></code> directory. Typically this includes the <code class="docutils literal notranslate"><span class="pre">nuttx</span></code> |
| ELF file (suitable for debugging using <code class="docutils literal notranslate"><span class="pre">gdb</span></code>) and a <code class="docutils literal notranslate"><span class="pre">nuttx.bin</span></code> |
| file that can be flashed to the board.</p> |
| <p>To clean the build, you can do:</p> |
| <blockquote> |
| <div><div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>make<span class="w"> </span>clean |
| </pre></div> |
| </div> |
| </div></blockquote> |
| <div class="admonition tip"> |
| <p class="admonition-title">Tip</p> |
| <p>To increase build speed (or of any other target such as <code class="docutils literal notranslate"><span class="pre">clean</span></code>), you can |
| pass the <code class="docutils literal notranslate"><span class="pre">-jN</span></code> flag to <code class="docutils literal notranslate"><span class="pre">make</span></code>, where <code class="docutils literal notranslate"><span class="pre">N</span></code> is the number of parallel jobs |
| to start (usually, the number of processors on your machine).</p> |
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