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<a name="Darwin-1"></a>
<h4 class="subsection">21.1.6 Darwin</h4>
<a name="index-Darwin"></a>

<p><small>GDB</small> provides the following commands specific to the Darwin target:
</p>
<dl compact="compact">
<dt><code>set debug darwin <var>num</var></code></dt>
<dd><a name="index-set-debug-darwin"></a>
<p>When set to a non zero value, enables debugging messages specific to
the Darwin support.  Higher values produce more verbose output.
</p>
</dd>
<dt><code>show debug darwin</code></dt>
<dd><a name="index-show-debug-darwin"></a>
<p>Show the current state of Darwin messages.
</p>
</dd>
<dt><code>set debug mach-o <var>num</var></code></dt>
<dd><a name="index-set-debug-mach_002do"></a>
<p>When set to a non zero value, enables debugging messages while
<small>GDB</small> is reading Darwin object files.  (<em>Mach-O</em> is the
file format used on Darwin for object and executable files.)  Higher
values produce more verbose output.  This is a command to diagnose
problems internal to <small>GDB</small> and should not be needed in normal
usage.
</p>
</dd>
<dt><code>show debug mach-o</code></dt>
<dd><a name="index-show-debug-mach_002do"></a>
<p>Show the current state of Mach-O file messages.
</p>
</dd>
<dt><code>set mach-exceptions on</code></dt>
<dt><code>set mach-exceptions off</code></dt>
<dd><a name="index-set-mach_002dexceptions"></a>
<p>On Darwin, faults are first reported as a Mach exception and are then
mapped to a Posix signal.  Use this command to turn on trapping of
Mach exceptions in the inferior.  This might be sometimes useful to
better understand the cause of a fault.  The default is off.
</p>
</dd>
<dt><code>show mach-exceptions</code></dt>
<dd><a name="index-show-mach_002dexceptions"></a>
<p>Show the current state of exceptions trapping.
</p></dd>
</dl>


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