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| 1 | <html> | ||
| 2 | <head> | ||
| 3 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> | ||
| 4 | <title>3.2.4.1. Debugging</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="tips-and-tricks.html" title="3.2.4. Tips and Tricks"> | ||
| 9 | <link rel="prev" href="tips-and-tricks.html" title="3.2.4. Tips and Tricks"> | ||
| 10 | <link rel="next" href="invalidating-shared-state.html" title="3.2.4.2. Invalidating Shared State"> | ||
| 11 | </head> | ||
| 12 | <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" title="3.2.4.1. Debugging"> | ||
| 13 | <div class="titlepage"><div><div><h4 class="title"> | ||
| 14 | <a name="debugging"></a>3.2.4.1. Debugging</h4></div></div></div> | ||
| 15 | <p> | ||
| 16 | When things go wrong, debugging needs to be straightforward. | ||
| 17 | Because of this, the Yocto Project team included strong debugging | ||
| 18 | tools: | ||
| 19 | </p> | ||
| 20 | <div class="itemizedlist"><ul class="itemizedlist" type="disc"> | ||
| 21 | <li class="listitem"><p>Whenever a shared state package is written out, so is a | ||
| 22 | corresponding <code class="filename">.siginfo</code> file. | ||
| 23 | This practice results in a pickled python database of all | ||
| 24 | the metadata that went into creating the hash for a given shared state | ||
| 25 | package.</p></li> | ||
| 26 | <li class="listitem"><p>If BitBake is run with the <code class="filename">--dump-signatures</code> | ||
| 27 | (or <code class="filename">-S</code>) option, BitBake dumps out | ||
| 28 | <code class="filename">.siginfo</code> files in | ||
| 29 | the stamp directory for every task it would have executed instead of | ||
| 30 | building the specified target package.</p></li> | ||
| 31 | <li class="listitem"><p>There is a <code class="filename">bitbake-diffsigs</code> command that | ||
| 32 | can process these <code class="filename">.siginfo</code> files. | ||
| 33 | If one file is specified, it will dump out the dependency | ||
| 34 | information in the file. | ||
| 35 | If two files are specified, it will compare the two files and dump out | ||
| 36 | the differences between the two. | ||
| 37 | This allows the question of "What changed between X and Y?" to be | ||
| 38 | answered easily.</p></li> | ||
| 39 | </ul></div> | ||
| 40 | <p> | ||
| 41 | </p> | ||
| 42 | </div></body> | ||
| 43 | </html> | ||