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<title>Summary (Debugging with GDB)</title>
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<a name="Summary"></a>
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<p>
Next: <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> [<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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<hr>
<a name="Summary-of-GDB"></a>
<h2 class="unnumbered">Summary of <small>GDB</small></h2>
<p>The purpose of a debugger such as <small>GDB</small> is to allow you to see what is
going on “inside” another program while it executes—or what another
program was doing at the moment it crashed.
</p>
<p><small>GDB</small> can do four main kinds of things (plus other things in support of
these) to help you catch bugs in the act:
</p>
<ul>
<li> Start your program, specifying anything that might affect its behavior.
</li><li> Make your program stop on specified conditions.
</li><li> Examine what has happened, when your program has stopped.
</li><li> Change things in your program, so you can experiment with correcting the
effects of one bug and go on to learn about another.
</li></ul>
<p>You can use <small>GDB</small> to debug programs written in C and C<tt>++</tt>.
For more information, see <a href="Supported-Languages.html#Supported-Languages">Supported Languages</a>.
For more information, see <a href="C.html#C">C and C++</a>.
</p>
<p>Support for D is partial. For information on D, see
<a href="D.html#D">D</a>.
</p>
<a name="index-Modula_002d2"></a>
<p>Support for Modula-2 is partial. For information on Modula-2, see
<a href="Modula_002d2.html#Modula_002d2">Modula-2</a>.
</p>
<p>Support for OpenCL C is partial. For information on OpenCL C, see
<a href="OpenCL-C.html#OpenCL-C">OpenCL C</a>.
</p>
<a name="index-Pascal"></a>
<p>Debugging Pascal programs which use sets, subranges, file variables, or
nested functions does not currently work. <small>GDB</small> does not support
entering expressions, printing values, or similar features using Pascal
syntax.
</p>
<a name="index-Fortran"></a>
<p><small>GDB</small> can be used to debug programs written in Fortran, although
it may be necessary to refer to some variables with a trailing
underscore.
</p>
<p><small>GDB</small> can be used to debug programs written in Objective-C,
using either the Apple/NeXT or the GNU Objective-C runtime.
</p>
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<tr><td align="left" valign="top">• <a href="Free-Software.html#Free-Software" accesskey="1">Free Software</a>:</td><td> </td><td align="left" valign="top">Freely redistributable software
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<tr><td align="left" valign="top">• <a href="Free-Documentation.html#Free-Documentation" accesskey="2">Free Documentation</a>:</td><td> </td><td align="left" valign="top">Free Software Needs Free Documentation
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<tr><td align="left" valign="top">• <a href="Contributors.html#Contributors" accesskey="3">Contributors</a>:</td><td> </td><td align="left" valign="top">Contributors to GDB
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