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<li><a class="reference internal" href="#">Using CCache to speed up compilation</a></li>
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<li><a class="reference internal" href="#using-colorgcc-to-colorize-output">Using colorgcc to colorize output</a></li>
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<div class="section" id="using-ccache-to-speed-up-compilation">
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<span id="c-cache"></span><h1>Using CCache to speed up compilation</h1>
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<p><a class="reference external" href="http://ccache.samba.org/">CCache</a> is nothing more than a cache for your
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compiler. ccache is usually very easy to install. Here’s an example for Ubuntu
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systems:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sudo</span> <span class="n">apt</span><span class="o">-</span><span class="n">get</span> <span class="n">install</span> <span class="n">ccache</span>
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</pre></div>
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<p><code class="docutils literal notranslate"><span class="pre">ccache</span></code> will cache previous compilations, detect when the same compilation
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is being done again, and reuse its cache instead of recompiling the source code
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again. This can speed up your compilation by many orders of magnitude,
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especially in those situations where your file timestamps change, and <code class="docutils literal notranslate"><span class="pre">make</span></code>
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is triggering a recompile.</p>
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<p>To enable ccache, simply add ‘/usr/lib/ccache’ to the beginning of your PATH.
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This directory contains symlinks to ccache, and ccache is smart enough to
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look at the name of the calling executable to determine which real executable
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to run. I.e. there is a symlink from ‘/usr/lib/ccache/g++’ to just ‘ccache’,
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but it actually runs the equivalent of ‘ccache g++’.</p>
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</div>
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<div class="section" id="using-colorgcc-to-colorize-output">
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<h1>Using colorgcc to colorize output</h1>
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<p><a class="reference external" href="https://github.com/johannes/colorgcc">colorgcc</a> is a colorizer for the output
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of GCC, and allows you to better interpret the compiler warnings/errors.</p>
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<p>To enable both colorgcc and ccache, perform the following steps:</p>
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<p>Install <code class="docutils literal notranslate"><span class="pre">colorgcc</span></code> on an Ubuntu system with</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sudo</span> <span class="n">apt</span><span class="o">-</span><span class="n">get</span> <span class="n">install</span> <span class="n">colorgcc</span>
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</pre></div>
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</div>
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<p>To enable colorgcc, perform the following steps:</p>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>cp /etc/colorgcc/colorgccrc <span class="nv">$HOME</span>/.colorgccrc
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</pre></div>
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</div>
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<ul class="simple">
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<li>edit the $HOME/.colorgccrc file, search for the following lines:</li>
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</ul>
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<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>g++: /usr/bin/g++
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gcc: /usr/bin/gcc
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c++: /usr/bin/g++
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cc: /usr/bin/gcc
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g77: /usr/bin/g77
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f77: /usr/bin/g77
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gcj: /usr/bin/gcj
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</pre></div>
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</div>
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<p>and replace them with:</p>
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<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>g++: ccache /usr/bin/g++
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gcc: ccache /usr/bin/gcc
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c++: ccache /usr/bin/g++
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cc: ccache /usr/bin/gcc
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g77: ccache /usr/bin/g77
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f77: ccache /usr/bin/g77
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gcj: ccache /usr/bin/gcj
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</pre></div>
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</div>
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<ul class="simple">
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<li>create a $HOME/bin or $HOME/sbin directory, and create the following softlinks in it</li>
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</ul>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>ln -s /usr/bin/colorgcc c++
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ln -s /usr/bin/colorgcc cc
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ln -s /usr/bin/colorgcc g++
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ln -s /usr/bin/colorgcc gcc
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</pre></div>
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</div>
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<p>make sure that $HOME/bin or $HOME/sbin is the first directory in your $PATH, e.g.:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>export PATH=$HOME/bin:$PATH
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</pre></div>
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</div>
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<p>or:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>export PATH=$HOME/sbin:$PATH
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</pre></div>
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</div>
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<p>depending on where you stored the <code class="docutils literal notranslate"><span class="pre">colorgcc</span></code> softlinks, so that when
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cc/gcc/g++/c++ is invoked the freshly created softlinks get activated first and
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not the global /usr/bin/{cc,gcc,g++,c++}.</p>
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