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<div><div class="header">
<div class="headertitle"><div class="title">Building a Discord Bot Using CMake (UNIX) </div></div>
</div><!--header-->
<div class="contents">
<div class="textblock"><dl class="section warning"><dt>Warning</dt><dd><b>This tutorial will assume that you have already installed DPP.</b> If you haven't, please head over to <a class="el" href="install-linux-deb.html">this page</a>, or any install page that matches your OS. If you want to use source, then continue your journey over at <a class="el" href="buildlinux.html">this page</a> for a full explanation into using CMake with source.</dd></dl>
<h2><a class="anchor" id="autotoc_md170"></a>
1. Toolchain</h2>
<p >Before continuing, you will need to install <code>cmake</code> on your system. To be sure that <code>cmake</code> is installed, you can type the following command:</p>
<div class="fragment"><div class="line">$ cmake --version</div>
<div class="line">cmake version 3.22.1</div>
</div><!-- fragment --><p >If your CMake version is not as shown above then don't worry! You can still follow along, even if you're ahead or behind!</p>
<h2><a class="anchor" id="autotoc_md171"></a>
2. Create a CMake project</h2>
<p >In an empty directory, create the following files and directories:</p>
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<h2><a class="anchor" id="autotoc_md172"></a>
3. Configure CMake</h2>
<p >You'll need to modify the <code>CMakeLists.txt</code> to tell CMake what it's looking for, and other information.</p>
<p >Here is an example CMake configuration, you can adapt it according to your needs:</p>
<div class="fragment"><div class="line"># Minimum CMake version required, we'll just use the latest version.</div>
<div class="line">cmake_minimum_required(VERSION 3.22)</div>
<div class="line"># Project name, version and description</div>
<div class="line">project(discord-bot VERSION 1.0 DESCRIPTION "A discord bot")</div>
<div class="line"> </div>
<div class="line">list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)</div>
<div class="line"> </div>
<div class="line"># Create an executable</div>
<div class="line">add_executable(${PROJECT_NAME}</div>
<div class="line"> src/main.cpp</div>
<div class="line">)</div>
<div class="line"> </div>
<div class="line"># Find our pre-installed DPP package (using FindDPP.cmake).</div>
<div class="line">find_package(DPP REQUIRED)</div>
<div class="line"> </div>
<div class="line"># Link the pre-installed DPP package.</div>
<div class="line">target_link_libraries(${PROJECT_NAME} </div>
<div class="line"> ${DPP_LIBRARIES}</div>
<div class="line">)</div>
<div class="line"> </div>
<div class="line"># Include the DPP directories.</div>
<div class="line">target_include_directories(${PROJECT_NAME} PRIVATE</div>
<div class="line"> ${DPP_INCLUDE_DIR}</div>
<div class="line">)</div>
<div class="line"> </div>
<div class="line"># Set C++ version</div>
<div class="line">set_target_properties(${PROJECT_NAME} PROPERTIES</div>
<div class="line"> CXX_STANDARD 17</div>
<div class="line"> CXX_STANDARD_REQUIRED ON</div>
<div class="line">)</div>
</div><!-- fragment --><p >We'll also need to populate our <code>FindDPP.cmake</code> file, inside the <code>cmake</code> directory!</p>
<p >Here's what you should use:</p>
<div class="fragment"><div class="line">find_path(DPP_INCLUDE_DIR NAMES dpp/dpp.h HINTS ${DPP_ROOT_DIR})</div>
<div class="line"> </div>
<div class="line">find_library(DPP_LIBRARIES NAMES dpp "libdpp.a" HINTS ${DPP_ROOT_DIR})</div>
<div class="line"> </div>
<div class="line">include(FindPackageHandleStandardArgs)</div>
<div class="line"> </div>
<div class="line">find_package_handle_standard_args(DPP DEFAULT_MSG DPP_LIBRARIES DPP_INCLUDE_DIR)</div>
</div><!-- fragment --><h2><a class="anchor" id="autotoc_md173"></a>
4. Build the bot.</h2>
<p >Now that we have our all our cmake stuff setup and we've got our code in place, we can initalise CMake. You'll want to go inside the <code>build/</code> directory and do <code>cmake ..</code>.</p>
<p >Once that's completed, you'll want to head back to your up-most folder (where all the folders are for your bot) and run <code>cmake --build build/ -j4</code> (replace -j4 with however many threads you want to use). This will start compiling your bot and creating the executable.</p>
<p >After that has finished, you can head into <code>build/</code> and run your bot by doing <code>./discord-bot</code>! If everything went well, you should see your bot come online!</p>
<p ><b>Have fun!</b> </p>
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<li class="navelem"><a class="el" href="creating-a-discord-bot.html">Creating a Discord Bot</a></li>
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