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1<html>
2<head>
3<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
4<title>2.4.1. Enabling and Disabling Build History</title>
5<link rel="stylesheet" type="text/css" href="../book.css">
6<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
7<link rel="home" href="index.html" title="The Yocto Project Reference Manual">
8<link rel="up" href="maintaining-build-output-quality.html" title="2.4. Maintaining Build Output Quality">
9<link rel="prev" href="maintaining-build-output-quality.html" title="2.4. Maintaining Build Output Quality">
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11</head>
12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="2.4.1. Enabling and Disabling Build History">
13<div class="titlepage"><div><div><h3 class="title">
14<a name="enabling-and-disabling-build-history"></a>2.4.1. Enabling and Disabling Build History</h3></div></div></div>
15<p>
16 Build history is disabled by default.
17 To enable it, add the following statements to the end of your
18 <code class="filename">conf/local.conf</code> file found in the
19 <a class="link" href="../dev-manual/build-directory.html" target="_self">Build Directory</a>:
20 </p>
21<pre class="literallayout">
22 INHERIT += "buildhistory"
23 BUILDHISTORY_COMMIT = "1"
24 </pre>
25<p>
26 Enabling build history as previously described
27 causes the build process to collect build
28 output information and commit it to a local
29 <a class="link" href="../dev-manual/git.html" target="_self">Git</a> repository.
30 </p>
31<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
32<h3 class="title">Note</h3>
33 Enabling build history increases your build times slightly,
34 particularly for images, and increases the amount of disk
35 space used during the build.
36 </div>
37<p>
38 </p>
39<p>
40 You can disable build history by removing the previous statements
41 from your <code class="filename">conf/local.conf</code> file.
42 However, you should realize that enabling and disabling
43 build history in this manner can change the
44 <code class="filename">do_package</code> task checksums, which if you
45 are using the OEBasicHash signature generator (the default
46 for many current distro configurations including
47 <code class="filename">DISTRO = "poky"</code> and
48 <code class="filename">DISTRO = ""</code>) will result in the packaging
49 tasks being re-run during the subsequent build.
50 </p>
51<p>
52 To disable the build history functionality without causing the
53 packaging tasks to be re-run, add just this statement to your
54 <code class="filename">conf/local.conf</code> file:
55 </p>
56<pre class="literallayout">
57 BUILDHISTORY_FEATURES = ""
58 </pre>
59<p>
60 </p>
61</div></body>
62</html>