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1<html>
2<head>
3<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
4<title>Chapter 7. Classes</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="index.html" title="The Yocto Project Reference Manual">
9<link rel="prev" href="ref-bitbake-fetchers.html" title="6.7. Fetchers">
10<link rel="next" href="ref-classes-base.html" title="7.1. The base class - base.bbclass">
11</head>
12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="chapter" title="Chapter 7. Classes">
13<div class="titlepage"><div><div><h2 class="title">
14<a name="ref-classes"></a>Chapter 7. Classes</h2></div></div></div>
15<div class="toc">
16<p><b>Table of Contents</b></p>
17<dl>
18<dt><span class="section"><a href="ref-classes-base.html">7.1. The base class - <code class="filename">base.bbclass</code></a></span></dt>
19<dt><span class="section"><a href="ref-classes-autotools.html">7.2. Autotooled Packages - <code class="filename">autotools.bbclass</code></a></span></dt>
20<dt><span class="section"><a href="ref-classes-update-alternatives.html">7.3. Alternatives - <code class="filename">update-alternatives.bbclass</code></a></span></dt>
21<dt><span class="section"><a href="ref-classes-update-rc.d.html">7.4. Initscripts - <code class="filename">update-rc.d.bbclass</code></a></span></dt>
22<dt><span class="section"><a href="ref-classes-binconfig.html">7.5. Binary config scripts - <code class="filename">binconfig.bbclass</code></a></span></dt>
23<dt><span class="section"><a href="ref-classes-debian.html">7.6. Debian renaming - <code class="filename">debian.bbclass</code></a></span></dt>
24<dt><span class="section"><a href="ref-classes-pkgconfig.html">7.7. Pkg-config - <code class="filename">pkgconfig.bbclass</code></a></span></dt>
25<dt><span class="section"><a href="ref-classes-src-distribute.html">7.8. Distribution of sources - <code class="filename">src_distribute_local.bbclass</code></a></span></dt>
26<dt><span class="section"><a href="ref-classes-perl.html">7.9. Perl modules - <code class="filename">cpan.bbclass</code></a></span></dt>
27<dt><span class="section"><a href="ref-classes-distutils.html">7.10. Python extensions - <code class="filename">distutils.bbclass</code></a></span></dt>
28<dt><span class="section"><a href="ref-classes-devshell.html">7.11. Developer Shell - <code class="filename">devshell.bbclass</code></a></span></dt>
29<dt><span class="section"><a href="ref-classes-packagegroup.html">7.12. Package Groups - <code class="filename">packagegroup.bbclass</code></a></span></dt>
30<dt><span class="section"><a href="ref-classes-package.html">7.13. Packaging - <code class="filename">package*.bbclass</code></a></span></dt>
31<dt><span class="section"><a href="ref-classes-kernel.html">7.14. Building kernels - <code class="filename">kernel.bbclass</code></a></span></dt>
32<dt><span class="section"><a href="ref-classes-image.html">7.15. Creating images - <code class="filename">image.bbclass</code> and <code class="filename">rootfs*.bbclass</code></a></span></dt>
33<dt><span class="section"><a href="ref-classes-sanity.html">7.16. Host System sanity checks - <code class="filename">sanity.bbclass</code></a></span></dt>
34<dt><span class="section"><a href="ref-classes-insane.html">7.17. Generated output quality assurance checks - <code class="filename">insane.bbclass</code></a></span></dt>
35<dt><span class="section"><a href="ref-classes-siteinfo.html">7.18. Autotools configuration data cache - <code class="filename">siteinfo.bbclass</code></a></span></dt>
36<dt><span class="section"><a href="ref-classes-useradd.html">7.19. Adding Users - <code class="filename">useradd.bbclass</code></a></span></dt>
37<dt><span class="section"><a href="ref-classes-externalsrc.html">7.20. Using External Source - <code class="filename">externalsrc.bbclass</code></a></span></dt>
38<dt><span class="section"><a href="ref-classes-others.html">7.21. Other Classes</a></span></dt>
39</dl>
40</div>
41<p>
42 Class files are used to abstract common functionality and share it amongst multiple
43 <code class="filename">.bb</code> files.
44 Any metadata usually found in a <code class="filename">.bb</code> file can also be placed in a class
45 file.
46 Class files are identified by the extension <code class="filename">.bbclass</code> and are usually placed
47 in a <code class="filename">classes/</code> directory beneath the
48 <code class="filename">meta*/</code> directory found in the
49 <a class="link" href="../dev-manual/source-directory.html" target="_self">Source Directory</a>.
50 Class files can also be pointed to by BUILDDIR (e.g. <code class="filename">build/</code>)in the same way as
51 <code class="filename">.conf</code> files in the <code class="filename">conf</code> directory.
52 Class files are searched for in <a class="link" href="ref-variables-glos.html#var-BBPATH" title="BBPATH"><code class="filename">BBPATH</code></a>
53 using the same method by which <code class="filename">.conf</code> files are searched.
54</p>
55<p>
56 In most cases inheriting the class is enough to enable its features, although
57 for some classes you might need to set variables or override some of the
58 default behaviour.
59</p>
60</div></body>
61</html>