54 lines
2.4 KiB
HTML
54 lines
2.4 KiB
HTML
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<p>Recently I've started working on a C++ project that uses the CMake build
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system.<sup><a href="#r1" >[1]</a></sup> The first thing I was in charge of
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doing was fixing the build, as one of the dependencies is the SeetaFace2
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project.<sup><a href="#r2" >[2]</a></sup> Originally you had to have the
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SeetaFace2 project in a directory adjacent to the SeetaRest project directory,
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and you would manually compile SeetaFace2. This, for obvious reasons, is not a
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good build setup. So my task was to integrate it directly into the build using
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CMake's <code>ExternalProject</code>
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module.<sup><a href="#r3" >[3]</a></sup></p>
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<p>Generally, for those of us used to the way things work on Linux, generally
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speaking you want to work solely with the dependencies you can install from your
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distribution's repositories. The problem with this is, save for certain very
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popular libraries/tools, there are some inconsistencies as to what packages may
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be available in different distributions, what versions they have available, or
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even if it's compiled with the flags you need for your project. It's still ideal
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to link to something from the repositories, but it's not always possible.</p>
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<p>This is where <code>ExternalProject</code> comes in. This allows for
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dependencies to be downloaded and compiled with specific options that best suite
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the project. It's also done in a rather simple manner. Just by looking at the
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<code>SeetaFace2.cmake</code> module for the project, it's fairly easy for
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anyone with a basic knowledge of CMake syntax to see how this project is built
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and setup.<sup><a href="#r4" >[4]</a></sup> And since you're having to build an
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entire other project, it's also helpful that you have the option of choosing
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which targets to build (instead of the entire project).</p>
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<ol class="refs" >
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<li id="r1" >
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<a href="https://gitgud.io/bug-zapper-software/seeta_rest"
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target="_blank" >
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"Seeta Rest" on GitGud
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</a>
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</li>
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<li id="r2" >
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<a href="https://github.com/seetafaceengine/SeetaFace2/"
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target="_blank" >
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"SeetaFace2" on GitHub
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</a>
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</li>
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<li id="r3" >
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<a href="https://cmake.org/cmake/help/latest/module/ExternalProject.html"
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target="_blank" >
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ExternalProject CMake documentation
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</a>
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</li>
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<li id="r4" >
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<a href="https://gitgud.io/bug-zapper-software/seeta_rest/-/blob/master/CMake/SeetaFace2.cmake"
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target="_blank" >
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<code>SeetaFace2.cmake</code> file from Seeta Rest on GitGud.
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</a>
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</li>
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</ol>
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