62 lines
5.2 KiB
HTML
62 lines
5.2 KiB
HTML
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Chapter<EFBFBD>7.<2E>Classes</title>
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<link rel="stylesheet" type="text/css" href="../book.css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
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<link rel="home" href="index.html" title="The Yocto Project Reference Manual">
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<link rel="up" href="index.html" title="The Yocto Project Reference Manual">
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<link rel="prev" href="ref-bitbake-fetchers.html" title="6.7.<2E>Fetchers">
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<link rel="next" href="ref-classes-base.html" title="7.1.<2E>The base class - base.bbclass">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="chapter" title="Chapter<65>7.<2E>Classes">
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<div class="titlepage"><div><div><h2 class="title">
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<a name="ref-classes"></a>Chapter<EFBFBD>7.<2E>Classes</h2></div></div></div>
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<div class="toc">
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<p><b>Table of Contents</b></p>
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<dl>
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<dt><span class="section"><a href="ref-classes-base.html">7.1. The base class - <code class="filename">base.bbclass</code></a></span></dt>
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<dt><span class="section"><a href="ref-classes-autotools.html">7.2. Autotooled Packages - <code class="filename">autotools.bbclass</code></a></span></dt>
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<dt><span class="section"><a href="ref-classes-update-alternatives.html">7.3. Alternatives - <code class="filename">update-alternatives.bbclass</code></a></span></dt>
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<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>
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<dt><span class="section"><a href="ref-classes-binconfig.html">7.5. Binary config scripts - <code class="filename">binconfig.bbclass</code></a></span></dt>
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<dt><span class="section"><a href="ref-classes-debian.html">7.6. Debian renaming - <code class="filename">debian.bbclass</code></a></span></dt>
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<dt><span class="section"><a href="ref-classes-pkgconfig.html">7.7. Pkg-config - <code class="filename">pkgconfig.bbclass</code></a></span></dt>
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<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>
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<dt><span class="section"><a href="ref-classes-perl.html">7.9. Perl modules - <code class="filename">cpan.bbclass</code></a></span></dt>
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<dt><span class="section"><a href="ref-classes-distutils.html">7.10. Python extensions - <code class="filename">distutils.bbclass</code></a></span></dt>
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<dt><span class="section"><a href="ref-classes-devshell.html">7.11. Developer Shell - <code class="filename">devshell.bbclass</code></a></span></dt>
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<dt><span class="section"><a href="ref-classes-packagegroup.html">7.12. Package Groups - <code class="filename">packagegroup.bbclass</code></a></span></dt>
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<dt><span class="section"><a href="ref-classes-package.html">7.13. Packaging - <code class="filename">package*.bbclass</code></a></span></dt>
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<dt><span class="section"><a href="ref-classes-kernel.html">7.14. Building kernels - <code class="filename">kernel.bbclass</code></a></span></dt>
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<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>
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<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>
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<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>
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<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>
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<dt><span class="section"><a href="ref-classes-useradd.html">7.19. Adding Users - <code class="filename">useradd.bbclass</code></a></span></dt>
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<dt><span class="section"><a href="ref-classes-externalsrc.html">7.20. Using External Source - <code class="filename">externalsrc.bbclass</code></a></span></dt>
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<dt><span class="section"><a href="ref-classes-others.html">7.21. Other Classes</a></span></dt>
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</dl>
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</div>
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<p>
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Class files are used to abstract common functionality and share it amongst multiple
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<code class="filename">.bb</code> files.
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Any metadata usually found in a <code class="filename">.bb</code> file can also be placed in a class
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file.
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Class files are identified by the extension <code class="filename">.bbclass</code> and are usually placed
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in a <code class="filename">classes/</code> directory beneath the
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<code class="filename">meta*/</code> directory found in the
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<a class="link" href="../dev-manual/source-directory.html" target="_self">Source Directory</a>.
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Class files can also be pointed to by BUILDDIR (e.g. <code class="filename">build/</code>)in the same way as
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<code class="filename">.conf</code> files in the <code class="filename">conf</code> directory.
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Class files are searched for in <a class="link" href="ref-variables-glos.html#var-BBPATH" title="BBPATH"><code class="filename">BBPATH</code></a>
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using the same method by which <code class="filename">.conf</code> files are searched.
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</p>
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<p>
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In most cases inheriting the class is enough to enable its features, although
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for some classes you might need to set variables or override some of the
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default behaviour.
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</p>
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</div></body>
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</html>
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