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lecture02_buildSystem_handsOn.html
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</head>
<body class="article">
<div id="header">
<h1>Build System - hands on</h1>
</div>
<div id="content">
<div class="sect1">
<h2 id="_assembling_a_toolset">Assembling a toolset</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>C++ (required)</p>
</li>
<li>
<p>Conan.io (required)</p>
</li>
<li>
<p>git (recommended!!)</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_assembling_a_toolset_2">Assembling a toolset 2</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>SDL2 (required)</p>
<div class="ulist">
<ul>
<li>
<p>Windowing</p>
</li>
<li>
<p>GL context</p>
</li>
<li>
<p>input handling</p>
</li>
</ul>
</div>
</li>
<li>
<p>GLM (required)</p>
</li>
<li>
<p>GLEW (required)</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_assembling_a_toolset_3">Assembling a toolset 3</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>stb_image (recommended!!)</p>
<div class="ulist">
<ul>
<li>
<p>texture/image loading</p>
</li>
<li>
<p>SDL2_image has no Conan package</p>
</li>
</ul>
</div>
</li>
<li>
<p>SDL2_ttf (recommended!!)</p>
<div class="ulist">
<ul>
<li>
<p>text and fonts</p>
</li>
</ul>
</div>
</li>
<li>
<p>Assimp (recommended!!)</p>
<div class="ulist">
<ul>
<li>
<p>model loading</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_let_s_do_some_hands_on">Let’s do some hands-on</h2>
<div class="sectionbody">
</div>
</div>
<div class="sect1">
<h2 id="_prerequisite_software">Prerequisite Software</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><strong>conan</strong> installed (<a href="https://conan.io" class="bare">https://conan.io</a>)</p>
</li>
<li>
<p><strong>cmake</strong> installed (<a href="https://cmake.org/" class="bare">https://cmake.org/</a>)</p>
</li>
<li>
<p>some compiler/IDE for you system</p>
<div class="ulist">
<ul>
<li>
<p>e.g. Visual Studio 2015</p>
</li>
<li>
<p>e.g. <a href="http://www.codeblocks.org/">Code::Blocks</a></p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_prerequisite_files">Prerequisite Files</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><code>main.cpp</code> or other <code>cpp</code> file that contains our entry point</p>
<div class="ulist">
<ul>
<li>
<p>could be multiple files</p>
</li>
<li>
<p>could have multiple entry points - multiple projects</p>
</li>
</ul>
</div>
</li>
<li>
<p><code>conanfile.txt</code> in the root of your project</p>
<div class="ulist">
<ul>
<li>
<p>describing (to conan) which libraries your project needs</p>
</li>
</ul>
</div>
</li>
<li>
<p><code>CMakeLists.txt</code> in the root of your project</p>
<div class="ulist">
<ul>
<li>
<p>describing (to cmake) how to create a Build System</p>
</li>
<li>
<p>e.g. what we want cmake to put in our Visual Studio Solution</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="__code_conanfile_txt_code"><code>conanfile.txt</code></h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>has 4 possible sections, see <a href="http://docs.conan.io/en/latest/manage_deps/conanfile_txt.html">conan docs</a>:</p>
<div class="olist arabic">
<ol class="arabic">
<li>
<p><code>[requires]</code></p>
</li>
<li>
<p><code>[options]</code></p>
</li>
<li>
<p><code>[generators]</code></p>
</li>
<li>
<p><code>[imports]</code></p>
</li>
</ol>
</div>
</li>
</ul>
</div>
<div class="sect2">
<h3 id="__code_requires_code"><code>[requires]</code></h3>
<div class="ulist">
<ul>
<li>
<p>the required dependencies, for each four aspects:</p>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>the <code>name</code> - e.g. <code>SDL2</code></p>
</li>
<li>
<p>the <code>version</code> - e.g. <code>2.0.4</code></p>
</li>
<li>
<p>the <code>owner</code> - e.g. <code>lasote</code></p>
<div class="ulist">
<ul>
<li>
<p>who owns the package, not the library</p>
</li>
<li>
<p><code>lasote</code> is one of the main conan developers</p>
</li>
</ul>
</div>
</li>
<li>
<p>the <code>channel</code> - e.g. <code>stable</code></p>
<div class="ulist">
<ul>
<li>
<p>each package can have multiple channels</p>
</li>
</ul>
</div>
</li>
</ol>
</div>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="__code_options_code"><code>[options]</code></h3>
<div class="ulist">
<ul>
<li>
<p>package specific configuration</p>
</li>
<li>
<p>we can pass some information to each package about how we want to use it</p>
<div class="ulist">
<ul>
<li>
<p>for example, to the SDL2 package we can choose between a <strong>static</strong> or <strong>shared</strong> library</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="__code_generators_code"><code>[generators]</code></h3>
<div class="ulist">
<ul>
<li>
<p>Conan not only obtains packages, but also can tell "post-conan" tools about those packages</p>
</li>
<li>
<p>For example:</p>
<div class="ulist">
<ul>
<li>
<p>where the libraries are</p>
</li>
<li>
<p>which libraries to link to</p>
</li>
</ul>
</div>
</li>
<li>
<p>Conan can provide this information in a variety of formats - to various tools</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="__code_generators_code_2"><code>[generators]</code> 2</h3>
<div class="dlist">
<dl>
<dt class="hdlist1"><code>txt</code></dt>
<dd>
<p>generates a human-readable <code>conanbuildinfo.txt</code> file</p>
</dd>
<dt class="hdlist1"><code>cmake</code></dt>
<dd>
<p>generates <code>conanbuildinfo.cmake</code> - use from a <code>CMakeList.txt</code> file</p>
</dd>
<dt class="hdlist1"><code>xcode</code></dt>
<dd>
<p>generates <code>conanbuildinfo.xcconfig</code> - import into XCode</p>
</dd>
<dt class="hdlist1"><code>visual_studio</code></dt>
<dd>
<p>generates <code>conanbuildinfo.props</code> - import into Visual Studio</p>
</dd>
</dl>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
for both <code>xcode</code> and <code>visual_studio</code> you’ll still need to make a "Solution" or equivalent - Alternatively, you can use <code>cmake</code> to generate a "Solution" for you
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="__code_imports_code"><code>[imports]</code></h3>
<div class="ulist">
<ul>
<li>
<p>Define which shared libraries to copy and where to</p>
<div class="ulist">
<ul>
<li>
<p>usually you’ll need for each platform</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_which_libraries_do_we_need">Which libraries do we need?</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>We’ll put them in our <code>conanfile.txt</code></p>
</li>
<li>
<p>???</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_sample_code_conanfile_txt_code">Sample <code>conanfile.txt</code></h2>
<div class="sectionbody">
<div class="listingblock">
<div class="title">buildSystem/conanfile.txt</div>
<div class="content">
<pre class="highlight"><code class="language-conan" data-lang="conan">[requires]
##SDL
SDL2/2.0.4@lasote/stable
##Texture/Image Loading
#stb_image/2.12@dsobczyk/testing
##TrueType fonts
#SDL2_ttf/2.0.14@lasote/ci
## OpenGL
#glew/2.0.0@coding3d/stable
#glm/0.9.8.0@TimSimpson/testing
##ASSIMP - no package as of 2016_10_07
[options]
SDL2:shared=True #False
SDL2_ttf:shared=True #False
[generators]
cmake
[imports]</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_using_conan">Using Conan</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Start a command shell/console/terminal</p>
<div class="ulist">
<ul>
<li>
<p>gitbash, for example</p>
</li>
</ul>
</div>
</li>
<li>
<p><code>mkdir build && cd build</code></p>
</li>
<li>
<p><code>conan install ..</code> #ask conan to install packages listed in the parent directory (in conanfile.txt)</p>
<div class="ulist">
<ul>
<li>
<p>we’re doing "out-of-source" build - so all the build files are in their own directory</p>
<div class="ulist">
<ul>
<li>
<p>which we can remove at any time and reconstruct</p>
</li>
<li>
<p>best-practice</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_using_conan_without_a_code_conanfile_txt_code">Using Conan without a <code>conanfile.txt</code></h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>You can ask Conan to install a package directly, and then just use it how you like</p>
<div class="ulist">
<ul>
<li>
<p><code>conan install SDL2/2.0.4@lasote/stable</code></p>
</li>
<li>
<p>a <code>conanfile.txt</code> is generally better practice</p>
</li>
<li>
<p>but perhaps you’re experimenting, or just need the binaries</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_configurations">Configurations</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Conan, when it first runs, <a href="http://docs.conan.io/en/latest/getting_started.html#building-with-other-configurations">detects your system</a> and sets up a default configuration</p>
</li>
<li>
<p>The configuration ncludes things such as:</p>
<div class="ulist">
<ul>
<li>
<p>your architecture</p>
</li>
<li>
<p>your compiler and compiler version</p>
</li>
<li>
<p>your OS</p>
</li>
<li>
<p>Release or Debug</p>
</li>
</ul>
</div>
</li>
<li>
<p>You can override the defaults:</p>
<div class="ulist">
<ul>
<li>
<p>at the command line</p>
</li>
<li>
<p>in <code>~/.conan/conan.conf</code> - in your user space</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_looking_at_a_code_conanfile_py_code_for_existing_packages">Looking at a <code>conanfile.py</code> for existing Packages</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Each Conan Package is defined (mainly) with a <code>conanfile.py</code></p>
<div class="ulist">
<ul>
<li>
<p>this is much like a <code>conanfile.txt</code> but in Python</p>
</li>
<li>
<p>have a look a some of these to see how they work</p>
<div class="ulist">
<ul>
<li>
<p>really useful for debug Conan if you need to</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_sample_code_main_cpp_code">Sample <code>main.cpp</code></h2>
<div class="sectionbody">
<div class="listingblock">
<div class="title">buildSystem/main.cpp</div>
<div class="content">
<pre class="highlight"><code class="language-cmake" data-lang="cmake">#include <iostream>
#include "SDL.h"
int main(int argc, char* argv[])
{
//send HelloWorld! to console output
std::cout << "HelloWorld!\n";
if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
SDL_LogCritical(SDL_LOG_CATEGORY_APPLICATION,
"SDL_Init Error: %s\n", SDL_GetError());
return 1;
}
SDL_Log("SDL initialised OK!\n");
return 0;
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="__code_cmakelists_txt_code"><code>CMakeLists.txt</code></h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Has a huge amount of features</p>
<div class="ulist">
<ul>
<li>
<p>do manage highly complex builds</p>
</li>
<li>
<p>most we won’t use</p>
</li>
<li>
<p>read the <a href="https://cmake.org/documentation/">documentation</a> for more</p>
</li>
</ul>
</div>