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| 1 | <html> | ||
| 2 | <head> | ||
| 3 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> | ||
| 4 | <title>6.3. Dependencies</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="ref-bitbake.html" title="Chapter 6. BitBake"> | ||
| 9 | <link rel="prev" href="ref-bitbake-providers.html" title="6.2. Preferences and Providers"> | ||
| 10 | <link rel="next" href="ref-bitbake-tasklist.html" title="6.4. The Task List"> | ||
| 11 | </head> | ||
| 12 | <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="6.3. Dependencies"> | ||
| 13 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | ||
| 14 | <a name="ref-bitbake-dependencies"></a>6.3. Dependencies</h2></div></div></div> | ||
| 15 | <p> | ||
| 16 | Each target BitBake builds consists of multiple tasks such as | ||
| 17 | <code class="filename">fetch</code>, <code class="filename">unpack</code>, | ||
| 18 | <code class="filename">patch</code>, <code class="filename">configure</code>, | ||
| 19 | and <code class="filename">compile</code>. | ||
| 20 | For best performance on multi-core systems, BitBake considers each task as an independent | ||
| 21 | entity with its own set of dependencies. | ||
| 22 | </p> | ||
| 23 | <p> | ||
| 24 | Dependencies are defined through several variables. | ||
| 25 | You can find information about variables BitBake uses in the BitBake documentation, | ||
| 26 | which is found in the <code class="filename">bitbake/doc/manual</code> directory within the | ||
| 27 | <a class="link" href="../dev-manual/source-directory.html" target="_self">Source Directory</a>. | ||
| 28 | At a basic level, it is sufficient to know that BitBake uses the | ||
| 29 | <code class="filename"><a class="link" href="ref-variables-glos.html#var-DEPENDS" title="DEPENDS">DEPENDS</a></code> and | ||
| 30 | <code class="filename"><a class="link" href="ref-variables-glos.html#var-RDEPENDS" title="RDEPENDS">RDEPENDS</a></code> variables when | ||
| 31 | calculating dependencies. | ||
| 32 | </p> | ||
| 33 | </div></body> | ||
| 34 | </html> | ||