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<title>2.4.1. Enabling and Disabling Build History</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="2.4.1. Enabling and Disabling Build History">
<div class="titlepage"><div><div><h3 class="title">
<a name="enabling-and-disabling-build-history"></a>2.4.1. Enabling and Disabling Build History</h3></div></div></div>
<p>
            Build history is disabled by default.
            To enable it, add the following statements to the end of your 
            <code class="filename">conf/local.conf</code> file found in the 
            <a class="link" href="../dev-manual/build-directory.html" target="_self">Build Directory</a>:
            </p>
<pre class="literallayout">
     INHERIT += "buildhistory"
     BUILDHISTORY_COMMIT = "1"
            </pre>
<p>
            Enabling build history as previously described 
            causes the build process to collect build
            output information and commit it to a local 
            <a class="link" href="../dev-manual/git.html" target="_self">Git</a> repository.
            </p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>
                Enabling build history increases your build times slightly, 
                particularly for images, and increases the amount of disk
                space used during the build.
            </div>
<p> 
        </p>
<p>
            You can disable build history by removing the previous statements
            from your <code class="filename">conf/local.conf</code> file.
            However, you should realize that enabling and disabling 
            build history in this manner can change the 
            <code class="filename">do_package</code> task checksums, which if you 
            are using the OEBasicHash signature generator (the default 
            for many current distro configurations including
            <code class="filename">DISTRO = "poky"</code> and 
            <code class="filename">DISTRO = ""</code>) will result in the packaging 
            tasks being re-run during the subsequent build.
        </p>
<p>
            To disable the build history functionality without causing the 
            packaging tasks to be re-run, add just this statement to your 
            <code class="filename">conf/local.conf</code> file:               
            </p>
<pre class="literallayout">
     BUILDHISTORY_FEATURES = ""
            </pre>
<p>
        </p>
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