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| 1 | <html> | ||
| 2 | <head> | ||
| 3 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> | ||
| 4 | <title>3.1.1. BitBake</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="usingpoky-components.html" title="3.1. Yocto Project Components"> | ||
| 9 | <link rel="prev" href="usingpoky-components.html" title="3.1. Yocto Project Components"> | ||
| 10 | <link rel="next" href="usingpoky-components-metadata.html" title="3.1.2. Metadata (Recipes)"> | ||
| 11 | </head> | ||
| 12 | <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="3.1.1. BitBake"> | ||
| 13 | <div class="titlepage"><div><div><h3 class="title"> | ||
| 14 | <a name="usingpoky-components-bitbake"></a>3.1.1. BitBake</h3></div></div></div> | ||
| 15 | <p> | ||
| 16 | BitBake is the tool at the heart of the OpenEmbedded build system and is responsible | ||
| 17 | for parsing the metadata, generating a list of tasks from it, | ||
| 18 | and then executing those tasks. | ||
| 19 | To see a list of the options BitBake supports, use the following help command: | ||
| 20 | </p> | ||
| 21 | <pre class="literallayout"> | ||
| 22 | $ bitbake --help | ||
| 23 | </pre> | ||
| 24 | <p> | ||
| 25 | </p> | ||
| 26 | <p> | ||
| 27 | The most common usage for BitBake is <code class="filename">bitbake <packagename></code>, where | ||
| 28 | <code class="filename">packagename</code> is the name of the package you want to build | ||
| 29 | (referred to as the "target" in this manual). | ||
| 30 | The target often equates to the first part of a <code class="filename">.bb</code> filename. | ||
| 31 | So, to run the <code class="filename">matchbox-desktop_1.2.3.bb</code> file, you | ||
| 32 | might type the following: | ||
| 33 | </p> | ||
| 34 | <pre class="literallayout"> | ||
| 35 | $ bitbake matchbox-desktop | ||
| 36 | </pre> | ||
| 37 | <p> | ||
| 38 | Several different versions of <code class="filename">matchbox-desktop</code> might exist. | ||
| 39 | BitBake chooses the one selected by the distribution configuration. | ||
| 40 | You can get more details about how BitBake chooses between different | ||
| 41 | target versions and providers in the | ||
| 42 | "<a class="link" href="ref-bitbake-providers.html" title="6.2. Preferences and Providers">Preferences and Providers</a>" section. | ||
| 43 | </p> | ||
| 44 | <p> | ||
| 45 | BitBake also tries to execute any dependent tasks first. | ||
| 46 | So for example, before building <code class="filename">matchbox-desktop</code>, BitBake | ||
| 47 | would build a cross compiler and <code class="filename">eglibc</code> if they had not already | ||
| 48 | been built. | ||
| 49 | </p> | ||
| 50 | <div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"> | ||
| 51 | <h3 class="title">Note</h3>This release of the Yocto Project does not support the <code class="filename">glibc</code> | ||
| 52 | GNU version of the Unix standard C library. By default, the OpenEmbedded build system | ||
| 53 | builds with <code class="filename">eglibc</code>.</div> | ||
| 54 | <p> | ||
| 55 | </p> | ||
| 56 | <p> | ||
| 57 | A useful BitBake option to consider is the <code class="filename">-k</code> or | ||
| 58 | <code class="filename">--continue</code> option. | ||
| 59 | This option instructs BitBake to try and continue processing the job as much | ||
| 60 | as possible even after encountering an error. | ||
| 61 | When an error occurs, the target that | ||
| 62 | failed and those that depend on it cannot be remade. | ||
| 63 | However, when you use this option other dependencies can still be processed. | ||
| 64 | </p> | ||
| 65 | </div></body> | ||
| 66 | </html> | ||