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<a name="Extending-GDB"></a>
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<a name="Extending-GDB-1"></a>
<h2 class="chapter">23 Extending <small>GDB</small></h2>
<a name="index-extending-GDB"></a>

<p><small>GDB</small> provides several mechanisms for extension.
<small>GDB</small> also provides the ability to automatically load
extensions when it reads a file for debugging.  This allows the
user to automatically customize <small>GDB</small> for the program
being debugged.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="Sequences.html#Sequences" accesskey="1">Sequences</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Canned Sequences of <small>GDB</small> Commands
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Python.html#Python" accesskey="2">Python</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Extending <small>GDB</small> using Python
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Guile.html#Guile" accesskey="3">Guile</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Extending <small>GDB</small> using Guile
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Auto_002dloading-extensions.html#Auto_002dloading-extensions" accesskey="4">Auto-loading extensions</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Automatically loading extensions
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Multiple-Extension-Languages.html#Multiple-Extension-Languages" accesskey="5">Multiple Extension Languages</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Working with multiple extension languages
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Aliases.html#Aliases" accesskey="6">Aliases</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Creating new spellings of existing commands
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<p>To facilitate the use of extension languages, <small>GDB</small> is capable
of evaluating the contents of a file.  When doing so, <small>GDB</small>
can recognize which extension language is being used by looking at
the filename extension.  Files with an unrecognized filename extension
are always treated as a <small>GDB</small> Command Files.
See <a href="Command-Files.html#Command-Files">Command files</a>.
</p>
<p>You can control how <small>GDB</small> evaluates these files with the following
setting:
</p>
<dl compact="compact">
<dd><a name="index-set-script_002dextension"></a>
<a name="index-show-script_002dextension"></a>
</dd>
<dt><code>set script-extension off</code></dt>
<dd><p>All scripts are always evaluated as <small>GDB</small> Command Files.
</p>
</dd>
<dt><code>set script-extension soft</code></dt>
<dd><p>The debugger determines the scripting language based on filename
extension.  If this scripting language is supported, <small>GDB</small>
evaluates the script using that language.  Otherwise, it evaluates
the file as a <small>GDB</small> Command File.
</p>
</dd>
<dt><code>set script-extension strict</code></dt>
<dd><p>The debugger determines the scripting language based on filename
extension, and evaluates the script using that language.  If the
language is not supported, then the evaluation fails.
</p>
</dd>
<dt><code>show script-extension</code></dt>
<dd><p>Display the current value of the <code>script-extension</code> option.
</p>
</dd>
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