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   <section id="c-example-using-cmake">
 <span id="cpp-cmake"></span><h1>C++ Example using CMake<a class="headerlink" href="#c-example-using-cmake" title="Permalink to this heading"></a></h1>
 <p>In some situations, developers intend to implement software using the NuttX platform in
 a previously set hardware and configuration where it is not possible or allowed to make
 changes. In such situations, less contact with the operating source tree is better, where
 it is only used for the application.</p>
 <p>Some approaches are possible to do that today:</p>
 <ul class="simple">
 <li><p><a class="reference external" href="https://cwiki.apache.org/confluence/display/NUTTX/Building+NuttX+with+Applications+Outside+of+the+Source+Tree">https://cwiki.apache.org/confluence/display/NUTTX/Building+NuttX+with+Applications+Outside+of+the+Source+Tree</a></p></li>
 <li><p><a class="reference external" href="https://www.programmersought.com/article/61604062421/">https://www.programmersought.com/article/61604062421/</a></p></li>
 </ul>
 <p>We have been seen the increase of the use of C++ language in embedded systems application. And
 CMake (<a class="reference external" href="https://www.cmake.org">https://www.cmake.org</a>) is the preferred build system used to build C++ projects. NuttX
 support C++ based projects.</p>
 <p>Using the ‘build as a library’ procedure of NuttX, it is possible to build NuttX
 applications using C++ language and also the cmake build tool.</p>
 <p>This document will show how to reimplement the hellocpp project using this cmake.</p>
 <section id="preparation">
 <h2>Preparation<a class="headerlink" href="#preparation" title="Permalink to this heading"></a></h2>
 <ol class="arabic">
 <li><p>Base NuttX compilation changes</p>
 <blockquote>
 <div><p>For this example, load the configuration ‘stm32f4discovery:testlibcxx’ for building</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>./tools/configure.sh<span class="w"> </span>stm32f4discovery:testlibcxx
 </pre></div>
 </div>
 <p>In menuconfig, the main points to be changed on a typical NuttX configuration are the following:</p>
 <ul class="simple">
 <li><p>Set RTOS Features -&gt; Tasks and Scheduling -&gt; Application entry point to ‘hellocpp_main’</p></li>
 <li><p>Build NuttX and generate the export</p></li>
 </ul>
 <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>make<span class="w"> </span><span class="nb">export</span>
 </pre></div>
 </div>
 </div></blockquote>
 </li>
 </ol>
 </section>
 <section id="creating-the-project">
 <h2>Creating the project<a class="headerlink" href="#creating-the-project" title="Permalink to this heading"></a></h2>
 <ol class="arabic">
 <li><p>Create your project file structure</p>
 <blockquote>
 <div><p>The project structure is organized as follow:</p>
 <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go">hellocpp/</span>
 <span class="go">hellocpp/CMakeLists.txt</span>
 <span class="go">hellocpp/cmake/stm32f4discovery.cmake</span>
 <span class="go">hellocpp/nuttx-export-10.0.1/</span>
 <span class="go">hellocpp/src/CMakeLists.txt</span>
 <span class="go">hellocpp/src/main.cpp</span>
 <span class="go">hellocpp/src/HelloWorld.h</span>
 <span class="go">hellocpp/src/HelloWorld.cpp</span>
 </pre></div>
 </div>
 <p>The directory ‘nuttx-export-10.0.1’ is the unzipped content from the file created during
 make export procedure done before.</p>
 </div></blockquote>
 </li>
 <li><p>File contents</p></li>
 </ol>
 <ul class="simple">
 <li><p>hellocpp/CMakeLists.txt</p></li>
 </ul>
 <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nb">cmake_minimum_required</span><span class="p">(</span><span class="s">VERSION</span><span class="w"> </span><span class="s">3.2...3.15</span><span class="p">)</span>

 <span class="nb">project</span><span class="p">(</span><span class="s">HelloCpp</span>
 <span class="w">        </span><span class="s">VERSION</span><span class="w"> </span><span class="s">1.0</span>
 <span class="w">        </span><span class="s">DESCRIPTION</span><span class="w"> </span><span class="s2">&quot;Hello world C++ NuttX&quot;</span>
 <span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_CXX_STANDARD</span><span class="w"> </span><span class="s">17</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_CXX_STANDARD_REQUIRED</span><span class="w"> </span><span class="s">ON</span><span class="p">)</span>
 <span class="c"># set(CMAKE_CXX_EXTENSIONS OFF)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_C_STANDARD</span><span class="w"> </span><span class="s">99</span><span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">NUTTX_PATH</span><span class="w"> </span><span class="s2">&quot;${CMAKE_SOURCE_DIR}/nuttx-export-10.0.1&quot;</span><span class="p">)</span>

 <span class="nb">include</span><span class="p">(</span><span class="s">cmake/stm32f4discovery.cmake</span><span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">AC_COMMON_FLAGS</span><span class="w"> </span><span class="s2">&quot;${AC_COMMON_FLAGS} -Wall -Wshadow -Wundef -fno-strict-aliasing -Os&quot;</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">AC_COMMON_FLAGS</span><span class="w"> </span><span class="s2">&quot;${AC_COMMON_FLAGS} -D_DEBUG -D_LIBCPP_BUILD_STATIC -D_LIBCPP_NO_EXCEPTIONS &quot;</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">AC_COMMON_FLAGS</span><span class="w"> </span><span class="s2">&quot;${AC_COMMON_FLAGS} -fno-exceptions -fcheck-new -fno-rtti -pedantic &quot;</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">AC_COMMON_FLAGS</span><span class="w"> </span><span class="s2">&quot;${AC_COMMON_FLAGS} -nostdinc++&quot;</span><span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">AC_DEFINES</span><span class="w"> </span><span class="s2">&quot;${AC_DEFINES} -DCONFIG_WCHAR_BUILTIN&quot;</span><span class="p">)</span>

 <span class="nb">include_directories</span><span class="p">(</span>
 <span class="w">        </span><span class="s">src</span>
 <span class="w">        </span><span class="o">${</span><span class="nv">NUTTX_PATH</span><span class="o">}</span><span class="s">/include</span>
 <span class="w">        </span><span class="o">${</span><span class="nv">NUTTX_PATH</span><span class="o">}</span><span class="s">/include/libcxx</span>
 <span class="w">        </span><span class="o">${</span><span class="nv">NUTTX_PATH</span><span class="o">}</span><span class="s">/arch/chip</span>
 <span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">EXE_NAME</span><span class="w"> </span><span class="s">hellocpp</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_C_FLAGS</span><span class="w"> </span><span class="s2">&quot;${CMAKE_C_FLAGS} ${AC_HW_FLAGS} ${AC_DEFINES}&quot;</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_CXX_FLAGS</span><span class="w">     </span><span class="s2">&quot;${AC_HW_FLAGS} ${AC_DEFINES} ${AC_COMMON_FLAGS} ${AC_CXX_EXTRA_FLAGS}&quot;</span><span class="p">)</span>
 <span class="nb">if</span><span class="w"> </span><span class="p">(</span><span class="s">PARAM_DEBUG</span><span class="p">)</span>
 <span class="w">    </span><span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_CXX_FLAGS</span><span class="w">     </span><span class="s2">&quot;${CMAKE_CXX_FLAGS} -g&quot;</span><span class="p">)</span>
 <span class="nb">endif</span><span class="p">()</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_SKIP_RPATH</span><span class="w"> </span><span class="s">ON</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_CXX_LINK_EXECUTABLE</span><span class="w"> </span><span class="s2">&quot;${CMAKE_LINKER} ${AC_LINKER_FLAGS} -o ${EXE_NAME}.elf &lt;OBJECTS&gt; &lt;LINK_LIBRARIES&gt;&quot;</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">BUILD_SHARED_LIBS</span><span class="w"> </span><span class="s">OFF</span><span class="p">)</span>
 <span class="nb">add_subdirectory</span><span class="p">(</span><span class="s">src</span><span class="p">)</span>
 </pre></div>
 </div>
 <ul class="simple">
 <li><p>hellocpp/cmake/stm32f4discovery.cmake</p></li>
 </ul>
 <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_SYSTEM_NAME</span><span class="w"> </span><span class="s">Generic</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_SYSTEM_PROCESSOR</span><span class="w"> </span><span class="s">arm</span><span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">MCU_LINKER_SCRIPT</span><span class="w"> </span><span class="s2">&quot;${NUTTX_PATH}/scripts/ld.script&quot;</span><span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">COMPILER_PREFIX</span><span class="w"> </span><span class="s">arm-none-eabi-</span><span class="p">)</span>

 <span class="c"># cmake-format: off</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_C_COMPILER</span><span class="w">    </span><span class="o">${</span><span class="nv">COMPILER_PREFIX</span><span class="o">}</span><span class="s">gcc</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_CXX_COMPILER</span><span class="w">  </span><span class="o">${</span><span class="nv">COMPILER_PREFIX</span><span class="o">}</span><span class="s">g++</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_AR</span><span class="w">            </span><span class="o">${</span><span class="nv">COMPILER_PREFIX</span><span class="o">}</span><span class="s">ar</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_RANLIB</span><span class="w">        </span><span class="o">${</span><span class="nv">COMPILER_PREFIX</span><span class="o">}</span><span class="s">ranlib</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_LINKER</span><span class="w">        </span><span class="o">${</span><span class="nv">COMPILER_PREFIX</span><span class="o">}</span><span class="s">ld</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_ASM_COMPILER</span><span class="w">  </span><span class="o">${</span><span class="nv">COMPILER_PREFIX</span><span class="o">}</span><span class="s">gcc</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_OBJCOPY</span><span class="w">       </span><span class="o">${</span><span class="nv">COMPILER_PREFIX</span><span class="o">}</span><span class="s">objcopy</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_OBJDUMP</span><span class="w">       </span><span class="o">${</span><span class="nv">COMPILER_PREFIX</span><span class="o">}</span><span class="s">objdump</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_SIZE</span><span class="w">          </span><span class="o">${</span><span class="nv">COMPILER_PREFIX</span><span class="o">}</span><span class="s">size</span><span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_FIND_ROOT_PATH_MODE_PROGRAM</span><span class="w"> </span><span class="s">NEVER</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_FIND_ROOT_PATH_MODE_LIBRARY</span><span class="w"> </span><span class="s">ONLY</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_FIND_ROOT_PATH_MODE_INCLUDE</span><span class="w"> </span><span class="s">ONLY</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_FIND_ROOT_PATH_MODE_PACKAGE</span><span class="w"> </span><span class="s">ONLY</span><span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">CMAKE_TRY_COMPILE_TARGET_TYPE</span><span class="w"> </span><span class="s">STATIC_LIBRARY</span><span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">AC_HW_FLAGS</span><span class="w">         </span><span class="s2">&quot;-mcpu=cortex-m4 -mthumb -mfloat-abi=soft &quot;</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">AC_HW_FLAGS</span><span class="w">         </span><span class="s2">&quot;${AC_HW_FLAGS} -isystem ${NUTTX_PATH}/include&quot;</span><span class="p">)</span>
 <span class="nb">set</span><span class="p">(</span><span class="s">AC_HW_FLAGS</span><span class="w">         </span><span class="s2">&quot;${AC_HW_FLAGS} -pipe&quot;</span><span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">AC_LINKER_FLAGS</span><span class="w">     </span><span class="s2">&quot;--entry=__start -nostdlib -T${MCU_LINKER_SCRIPT}&quot;</span><span class="p">)</span>
 </pre></div>
 </div>
 <ul class="simple">
 <li><p>hellocpp/src/CMakeLists.txt</p></li>
 </ul>
 <div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nb">set</span><span class="p">(</span><span class="s">HEADER_FILES</span>
 <span class="w">        </span><span class="s">HelloWorld.h</span>
 <span class="p">)</span>

 <span class="nb">set</span><span class="p">(</span><span class="s">SOURCE_FILES</span>
 <span class="w">        </span><span class="s">HelloWorld.cpp</span>
 <span class="p">)</span>

 <span class="nb">link_directories</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="o">${</span><span class="nv">NUTTX_PATH</span><span class="o">}</span><span class="s">/libs</span><span class="p">)</span>

 <span class="nb">add_executable</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="o">${</span><span class="nv">SOURCE_FILES</span><span class="o">}</span><span class="w"> </span><span class="s">main.cpp</span><span class="w"> </span><span class="o">${</span><span class="nv">HEADER_FILES</span><span class="o">}</span><span class="p">)</span>

 <span class="nb">add_custom_command</span><span class="p">(</span>
 <span class="w">        </span><span class="s">TARGET</span><span class="w"> </span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span>
 <span class="w">        </span><span class="s">POST_BUILD</span>
 <span class="w">        </span><span class="s">COMMAND</span><span class="w"> </span><span class="o">${</span><span class="nv">CMAKE_OBJCOPY</span><span class="o">}</span><span class="w"> </span><span class="s">ARGS</span><span class="w"> </span><span class="s">-S</span><span class="w"> </span><span class="s">-O</span><span class="w"> </span><span class="s">binary</span><span class="w"> </span><span class="o">${</span><span class="nv">CMAKE_BINARY_DIR</span><span class="o">}</span><span class="s">/</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="s">.elf</span><span class="w"> </span><span class="o">${</span><span class="nv">CMAKE_BINARY_DIR</span><span class="o">}</span><span class="s">/</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="s">.bin</span>
 <span class="p">)</span>

 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">--start-group</span><span class="p">)</span>

 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">sched</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">drivers</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">boards</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">c</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">mm</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">arch</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">xx</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">apps</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">fs</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">binfmt</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">board</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">gcc</span><span class="p">)</span>
 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">supc++</span><span class="p">)</span>

 <span class="nb">target_link_libraries</span><span class="p">(</span><span class="o">${</span><span class="nv">EXE_NAME</span><span class="o">}</span><span class="w"> </span><span class="s">--end-group</span><span class="p">)</span>
 </pre></div>
 </div>
 <ul class="simple">
 <li><p>hellocpp/src/main.cpp</p></li>
 </ul>
 <div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">&quot;HelloWorld.h&quot;</span>
 <span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;nuttx/config.h&gt;</span>

 <span class="k">extern</span><span class="w"> </span><span class="s">&quot;C&quot;</span>
 <span class="p">{</span>
 <span class="w">        </span><span class="kt">int</span><span class="w"> </span><span class="nf">hellocpp_main</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
 <span class="w">        </span><span class="p">{</span>

 <span class="w">                </span><span class="n">CHelloWorld</span><span class="w"> </span><span class="o">*</span><span class="n">pHelloWorld</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">CHelloWorld</span><span class="p">();</span>
 <span class="w">                </span><span class="n">pHelloWorld</span><span class="o">-&gt;</span><span class="n">HelloWorld</span><span class="p">();</span>

 <span class="w">                </span><span class="n">CHelloWorld</span><span class="w"> </span><span class="n">helloWorld</span><span class="p">;</span>
 <span class="w">                </span><span class="n">helloWorld</span><span class="p">.</span><span class="n">HelloWorld</span><span class="p">();</span>

 <span class="w">                </span><span class="k">delete</span><span class="w"> </span><span class="n">pHelloWorld</span><span class="p">;</span>
 <span class="w">                </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
 <span class="w">        </span><span class="p">}</span>
 <span class="p">}</span>
 </pre></div>
 </div>
 <ul class="simple">
 <li><p>hellocpp/src/HelloWorld.h</p></li>
 </ul>
 <div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="cp">#ifndef HELLOWORLD_H_</span>
 <span class="cp">#define HELLOWORLD_H_</span>

 <span class="cp">#include</span><span class="w"> </span><span class="cpf">&quot;nuttx/config.h&quot;</span>

 <span class="k">class</span><span class="w"> </span><span class="nc">CHelloWorld</span>
 <span class="p">{</span>
 <span class="w">        </span><span class="k">public</span><span class="o">:</span>
 <span class="w">                </span><span class="n">CHelloWorld</span><span class="p">();</span>
 <span class="w">                </span><span class="o">~</span><span class="n">CHelloWorld</span><span class="p">();</span>
 <span class="w">                </span><span class="kt">bool</span><span class="w"> </span><span class="nf">HelloWorld</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>
 <span class="w">        </span><span class="k">private</span><span class="o">:</span>
 <span class="w">                </span><span class="kt">int</span><span class="w"> </span><span class="n">mSecret</span><span class="p">;</span>
 <span class="p">};</span>

 <span class="cp">#endif</span>
 </pre></div>
 </div>
 <ul class="simple">
 <li><p>hellocpp/src/HelloWorld.cpp</p></li>
 </ul>
 <div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;cstdio&gt;</span>
 <span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;string&gt;</span>

 <span class="cp">#include</span><span class="w"> </span><span class="cpf">&quot;HelloWorld.h&quot;</span>

 <span class="n">CHelloWorld</span><span class="o">::</span><span class="n">CHelloWorld</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
 <span class="w">        </span><span class="n">mSecret</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">42</span><span class="p">;</span>
 <span class="w">        </span><span class="n">std</span><span class="o">::</span><span class="n">printf</span><span class="p">(</span><span class="s">&quot;Constructor: mSecret=%d</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span><span class="n">mSecret</span><span class="p">);</span>
 <span class="p">}</span>

 <span class="n">CHelloWorld</span><span class="o">::~</span><span class="n">CHelloWorld</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>

 <span class="p">}</span>

 <span class="kt">bool</span><span class="w"> </span><span class="n">CHelloWorld</span><span class="o">::</span><span class="n">HelloWorld</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
 <span class="w">        </span><span class="n">std</span><span class="o">::</span><span class="n">printf</span><span class="p">(</span><span class="s">&quot;HelloWorld: mSecret=%d</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span><span class="n">mSecret</span><span class="p">);</span>

 <span class="w">        </span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="w"> </span><span class="n">sentence</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;Hello&quot;</span><span class="p">;</span>
 <span class="w">        </span><span class="n">std</span><span class="o">::</span><span class="n">printf</span><span class="p">(</span><span class="s">&quot;TEST=%s</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span><span class="n">sentence</span><span class="p">.</span><span class="n">c_str</span><span class="p">());</span>

 <span class="w">        </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">mSecret</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">42</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
 <span class="w">                </span><span class="n">std</span><span class="o">::</span><span class="n">printf</span><span class="p">(</span><span class="s">&quot;CHelloWorld: HelloWorld: Hello, world!</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">);</span>
 <span class="w">                </span><span class="k">return</span><span class="w"> </span><span class="nb">true</span><span class="p">;</span>
 <span class="w">        </span><span class="p">}</span>
 <span class="w">        </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
 <span class="w">                </span><span class="n">std</span><span class="o">::</span><span class="n">printf</span><span class="p">(</span><span class="s">&quot;CHelloWorld: HelloWorld: CONSTRUCTION FAILED!</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">);</span>
 <span class="w">                </span><span class="k">return</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
 <span class="w">        </span><span class="p">}</span>
 <span class="p">}</span>
 </pre></div>
 </div>
 </section>
 <section id="building">
 <h2>Building<a class="headerlink" href="#building" title="Permalink to this heading"></a></h2>
 <p>To launch build, you use the cmake procedure:</p>
 <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>mkdir<span class="w"> </span>build
 <span class="gp">$ </span><span class="nb">cd</span><span class="w"> </span>build
 <span class="gp">$ </span>cmake<span class="w"> </span>..
 <span class="gp">$ </span>make
 </pre></div>
 </div>
 <p>And finally a bin file will be created to be loaded on the board.</p>
 </section>
 </section>


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