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<li><a class="reference internal" href="#">Single compilation units</a></li>
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<div class="section" id="single-compilation-units">
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<span id="single-compile-unit"></span><h1>Single compilation units</h1>
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<p>Even before reading <a class="footnote-reference" href="#id3" id="id1">[1]</a>, we noticed a great speed up in compile time for all
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PCL libraries if instead of compiling N object files and linking them together,
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we compile only one, and include all the sources of the N files in this main
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source. If you peek at an older version of PCL, you might notice things along
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the lines of:</p>
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<div class="highlight-cpp notranslate"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1
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4
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5
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6</pre></div></td><td class="code"><div class="highlight"><pre><span></span> <span class="c1">// Include the implementations instead of compiling them separately to speed up compile time</span>
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<span class="cp">#include</span> <span class="cpf">"extract_indices.cpp"</span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf">"passthrough.cpp"</span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf">"project_inliers.cpp"</span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf">"statistical_outlier_removal.cpp"</span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf">"voxel_grid.cpp"</span><span class="cp"></span>
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</pre></div>
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</td></tr></table></div>
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<p>and in CMakeLists.txt:</p>
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<div class="highlight-cmake notranslate"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1
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8
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9</pre></div></td><td class="code"><div class="highlight"><pre><span></span> <span class="nb">rosbuild_add_library</span> <span class="p">(</span><span class="s">pcl_ros_filters</span>
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<span class="s">src/pcl_ros/filters/filter.cpp</span>
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<span class="c"># Compilation is much faster if we include all the following CPP files in filters.cpp</span>
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<span class="c">#src/pcl_ros/filters/passthrough.cpp</span>
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<span class="c">#src/pcl_ros/filters/project_inliers.cpp</span>
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<span class="c">#src/pcl_ros/filters/extract_indices.cpp</span>
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<span class="c">#src/pcl_ros/filters/statistical_outlier_removal.cpp</span>
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<span class="c">#src/pcl_ros/filters/voxel_grid.cpp</span>
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<span class="p">)</span>
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</pre></div>
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</td></tr></table></div>
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<p>For more information on how/why this works, see <a class="footnote-reference" href="#id3" id="id2">[1]</a>.</p>
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<table class="docutils footnote" frame="void" id="id3" rules="none">
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<colgroup><col class="label" /><col /></colgroup>
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<tbody valign="top">
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<tr><td class="label">[1]</td><td><em>(<a class="fn-backref" href="#id1">1</a>, <a class="fn-backref" href="#id2">2</a>)</em> <a class="reference external" href="http://gamesfromwithin.com/physical-structure-and-c-part-2-build-times">http://gamesfromwithin.com/physical-structure-and-c-part-2-build-times</a></td></tr>
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</tbody>
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© Copyright
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