visus
/
toolchain-gcc-arm-embedded

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Copyright (C) 1988-2020 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with the
Invariant Sections being "Free Software" and "Free Software Needs
Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
and with the Back-Cover Texts as in (a) below.

(a) The FSF's Back-Cover Text is: "You are free to copy and modify
this GNU Manual.  Buying copies from GNU Press supports the FSF in
developing GNU and promoting software freedom." -->
<!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Invoking GDB (Debugging with GDB)</title>

<meta name="description" content="Invoking GDB (Debugging with GDB)">
<meta name="keywords" content="Invoking GDB (Debugging with GDB)">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<link href="index.html#Top" rel="start" title="Top">
<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="Invocation.html#Invocation" rel="up" title="Invocation">
<link href="File-Options.html#File-Options" rel="next" title="File Options">
<link href="Invocation.html#Invocation" rel="prev" title="Invocation">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smalllisp {margin-left: 3.2em}
kbd {font-style: oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nolinebreak {white-space: nowrap}
span.roman {font-family: initial; font-weight: normal}
span.sansserif {font-family: sans-serif; font-weight: normal}
ul.no-bullet {list-style: none}
-->
</style>


</head>

<body lang="en">
<a name="Invoking-GDB"></a>
<div class="header">
<p>
Next: <a href="Quitting-GDB.html#Quitting-GDB" accesskey="n" rel="next">Quitting GDB</a>, Up: <a href="Invocation.html#Invocation" accesskey="u" rel="up">Invocation</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>
</div>
<hr>
<a name="Invoking-GDB-1"></a>
<h3 class="section">2.1 Invoking <small>GDB</small></h3>

<p>Invoke <small>GDB</small> by running the program <code>gdb</code>.  Once started,
<small>GDB</small> reads commands from the terminal until you tell it to exit.
</p>
<p>You can also run <code>gdb</code> with a variety of arguments and options,
to specify more of your debugging environment at the outset.
</p>
<p>The command-line options described here are designed
to cover a variety of situations; in some environments, some of these
options may effectively be unavailable.
</p>
<p>The most usual way to start <small>GDB</small> is with one argument,
specifying an executable program:
</p>
<div class="smallexample">
<pre class="smallexample">gdb <var>program</var>
</pre></div>

<p>You can also start with both an executable program and a core file
specified:
</p>
<div class="smallexample">
<pre class="smallexample">gdb <var>program</var> <var>core</var>
</pre></div>

<p>You can, instead, specify a process ID as a second argument or use option
<code>-p</code>, if you want to debug a running process:
</p>
<div class="smallexample">
<pre class="smallexample">gdb <var>program</var> 1234
gdb -p 1234
</pre></div>

<p>would attach <small>GDB</small> to process <code>1234</code>.  With option <samp>-p</samp> you
can omit the <var>program</var> filename.
</p>
<p>Taking advantage of the second command-line argument requires a fairly
complete operating system; when you use <small>GDB</small> as a remote
debugger attached to a bare board, there may not be any notion of
&ldquo;process&rdquo;, and there is often no way to get a core dump.  <small>GDB</small>
will warn you if it is unable to attach or to read core dumps.
</p>
<p>You can optionally have <code>gdb</code> pass any arguments after the
executable file to the inferior using <code>--args</code>.  This option stops
option processing.
</p><div class="smallexample">
<pre class="smallexample">gdb --args gcc -O2 -c foo.c
</pre></div>
<p>This will cause <code>gdb</code> to debug <code>gcc</code>, and to set
<code>gcc</code>&rsquo;s command-line arguments (see <a href="Arguments.html#Arguments">Arguments</a>) to &lsquo;<samp>-O2 -c foo.c</samp>&rsquo;.
</p>
<p>You can run <code>gdb</code> without printing the front material, which describes
<small>GDB</small>&rsquo;s non-warranty, by specifying <code>--silent</code>
(or <code>-q</code>/<code>--quiet</code>):
</p>
<div class="smallexample">
<pre class="smallexample">gdb --silent
</pre></div>

<p>You can further control how <small>GDB</small> starts up by using command-line
options.  <small>GDB</small> itself can remind you of the options available.
</p>
<p>Type
</p>
<div class="smallexample">
<pre class="smallexample">gdb -help
</pre></div>

<p>to display all available options and briefly describe their use
(&lsquo;<samp>gdb -h</samp>&rsquo; is a shorter equivalent).
</p>
<p>All options and command line arguments you give are processed
in sequential order.  The order makes a difference when the
&lsquo;<samp>-x</samp>&rsquo; option is used.
</p>

<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="File-Options.html#File-Options" accesskey="1">File Options</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Choosing files
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Mode-Options.html#Mode-Options" accesskey="2">Mode Options</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Choosing modes
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Startup.html#Startup" accesskey="3">Startup</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">What <small>GDB</small> does during startup
</td></tr>
</table>

<hr>
<div class="header">
<p>
Next: <a href="Quitting-GDB.html#Quitting-GDB" accesskey="n" rel="next">Quitting GDB</a>, Up: <a href="Invocation.html#Invocation" accesskey="u" rel="up">Invocation</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>
</div>


</body>
</html>