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17<title>Debugging with GDB: Summary</title>
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64<a name="Summary"></a>
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66<p>
67Next: <a href="Sample-Session.html#Sample-Session" accesskey="n" rel="next">Sample Session</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
68</div>
69<hr>
70<a name="Summary-of-GDB"></a>
71<h2 class="unnumbered">Summary of <small>GDB</small></h2>
72
73<p>The purpose of a debugger such as <small>GDB</small> is to allow you to see what is
74going on &ldquo;inside&rdquo; another program while it executes&mdash;or what another
75program was doing at the moment it crashed.
76</p>
77<p><small>GDB</small> can do four main kinds of things (plus other things in support of
78these) to help you catch bugs in the act:
79</p>
80<ul>
81<li> Start your program, specifying anything that might affect its behavior.
82
83</li><li> Make your program stop on specified conditions.
84
85</li><li> Examine what has happened, when your program has stopped.
86
87</li><li> Change things in your program, so you can experiment with correcting the
88effects of one bug and go on to learn about another.
89</li></ul>
90
91<p>You can use <small>GDB</small> to debug programs written in C and C<tt>++</tt>.
92For more information, see <a href="Supported-Languages.html#Supported-Languages">Supported Languages</a>.
93For more information, see <a href="C.html#C">C and C++</a>.
94</p>
95<p>Support for D is partial.  For information on D, see
96<a href="D.html#D">D</a>.
97</p>
98<a name="index-Modula_002d2"></a>
99<p>Support for Modula-2 is partial.  For information on Modula-2, see
100<a href="Modula_002d2.html#Modula_002d2">Modula-2</a>.
101</p>
102<p>Support for OpenCL C is partial.  For information on OpenCL C, see
103<a href="OpenCL-C.html#OpenCL-C">OpenCL C</a>.
104</p>
105<a name="index-Pascal"></a>
106<p>Debugging Pascal programs which use sets, subranges, file variables, or
107nested functions does not currently work.  <small>GDB</small> does not support
108entering expressions, printing values, or similar features using Pascal
109syntax.
110</p>
111<a name="index-Fortran"></a>
112<p><small>GDB</small> can be used to debug programs written in Fortran, although
113it may be necessary to refer to some variables with a trailing
114underscore.
115</p>
116<p><small>GDB</small> can be used to debug programs written in Objective-C,
117using either the Apple/NeXT or the GNU Objective-C runtime.
118</p>
119<table class="menu" border="0" cellspacing="0">
120<tr><td align="left" valign="top">&bull; <a href="Free-Software.html#Free-Software" accesskey="1">Free Software</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Freely redistributable software
121</td></tr>
122<tr><td align="left" valign="top">&bull; <a href="Free-Documentation.html#Free-Documentation" accesskey="2">Free Documentation</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Free Software Needs Free Documentation
123</td></tr>
124<tr><td align="left" valign="top">&bull; <a href="Contributors.html#Contributors" accesskey="3">Contributors</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Contributors to GDB
125</td></tr>
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130<p>
131Next: <a href="Sample-Session.html#Sample-Session" accesskey="n" rel="next">Sample Session</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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