1<html lang="en"> 2<head> 3<title>Darwin - Debugging with GDB</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Debugging with GDB"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Native.html#Native" title="Native"> 9<link rel="prev" href="Hurd-Native.html#Hurd-Native" title="Hurd Native"> 10<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 11<!-- 12Copyright (C) 1988-2013 Free Software Foundation, Inc. 13 14Permission is granted to copy, distribute and/or modify this document 15under the terms of the GNU Free Documentation License, Version 1.3 or 16any later version published by the Free Software Foundation; with the 17Invariant Sections being ``Free Software'' and ``Free Software Needs 18Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' 19and with the Back-Cover Texts as in (a) below. 20 21(a) The FSF's Back-Cover Text is: ``You are free to copy and modify 22this GNU Manual. Buying copies from GNU Press supports the FSF in 23developing GNU and promoting software freedom.'' 24--> 25<meta http-equiv="Content-Style-Type" content="text/css"> 26<style type="text/css"><!-- 27 pre.display { font-family:inherit } 28 pre.format { font-family:inherit } 29 pre.smalldisplay { font-family:inherit; font-size:smaller } 30 pre.smallformat { font-family:inherit; font-size:smaller } 31 pre.smallexample { font-size:smaller } 32 pre.smalllisp { font-size:smaller } 33 span.sc { font-variant:small-caps } 34 span.roman { font-family:serif; font-weight:normal; } 35 span.sansserif { font-family:sans-serif; font-weight:normal; } 36--></style> 37<link rel="stylesheet" type="text/css" href="../cs.css"> 38</head> 39<body> 40<div class="node"> 41<a name="Darwin"></a> 42<p> 43Previous: <a rel="previous" accesskey="p" href="Hurd-Native.html#Hurd-Native">Hurd Native</a>, 44Up: <a rel="up" accesskey="u" href="Native.html#Native">Native</a> 45<hr> 46</div> 47 48<h4 class="subsection">21.1.7 Darwin</h4> 49 50<p><a name="index-Darwin-1391"></a> 51<span class="sc">gdb</span> provides the following commands specific to the Darwin target: 52 53 <dl> 54<dt><code>set debug darwin </code><var>num</var><dd><a name="index-set-debug-darwin-1392"></a>When set to a non zero value, enables debugging messages specific to 55the Darwin support. Higher values produce more verbose output. 56 57 <br><dt><code>show debug darwin</code><dd><a name="index-show-debug-darwin-1393"></a>Show the current state of Darwin messages. 58 59 <br><dt><code>set debug mach-o </code><var>num</var><dd><a name="index-set-debug-mach_002do-1394"></a>When set to a non zero value, enables debugging messages while 60<span class="sc">gdb</span> is reading Darwin object files. (<dfn>Mach-O</dfn> is the 61file format used on Darwin for object and executable files.) Higher 62values produce more verbose output. This is a command to diagnose 63problems internal to <span class="sc">gdb</span> and should not be needed in normal 64usage. 65 66 <br><dt><code>show debug mach-o</code><dd><a name="index-show-debug-mach_002do-1395"></a>Show the current state of Mach-O file messages. 67 68 <br><dt><code>set mach-exceptions on</code><dt><code>set mach-exceptions off</code><dd><a name="index-set-mach_002dexceptions-1396"></a>On Darwin, faults are first reported as a Mach exception and are then 69mapped to a Posix signal. Use this command to turn on trapping of 70Mach exceptions in the inferior. This might be sometimes useful to 71better understand the cause of a fault. The default is off. 72 73 <br><dt><code>show mach-exceptions</code><dd><a name="index-show-mach_002dexceptions-1397"></a>Show the current state of exceptions trapping. 74</dl> 75 76 </body></html> 77 78