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5.4 KiB
HTML
119 lines
5.4 KiB
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<html lang="en">
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<head>
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<title>Invoking GDB - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Invocation.html#Invocation" title="Invocation">
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<link rel="next" href="Quitting-GDB.html#Quitting-GDB" title="Quitting GDB">
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
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<div class="node">
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<a name="Invoking-GDB"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Quitting-GDB.html#Quitting-GDB">Quitting GDB</a>,
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Up: <a rel="up" accesskey="u" href="Invocation.html#Invocation">Invocation</a>
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<hr>
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</div>
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<h3 class="section">2.1 Invoking <span class="sc">gdb</span></h3>
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<p>Invoke <span class="sc">gdb</span> by running the program <code>gdb</code>. Once started,
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<span class="sc">gdb</span> reads commands from the terminal until you tell it to exit.
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<p>You can also run <code>gdb</code> with a variety of arguments and options,
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to specify more of your debugging environment at the outset.
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<p>The command-line options described here are designed
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to cover a variety of situations; in some environments, some of these
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options may effectively be unavailable.
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<p>The most usual way to start <span class="sc">gdb</span> is with one argument,
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specifying an executable program:
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<pre class="smallexample"> gdb <var>program</var>
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</pre>
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<p class="noindent">You can also start with both an executable program and a core file
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specified:
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<pre class="smallexample"> gdb <var>program</var> <var>core</var>
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</pre>
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<p>You can, instead, specify a process ID as a second argument, if you want
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to debug a running process:
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<pre class="smallexample"> gdb <var>program</var> 1234
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</pre>
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<p class="noindent">would attach <span class="sc">gdb</span> to process <code>1234</code> (unless you also have a file
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named <samp><span class="file">1234</span></samp>; <span class="sc">gdb</span> does check for a core file first).
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<p>Taking advantage of the second command-line argument requires a fairly
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complete operating system; when you use <span class="sc">gdb</span> as a remote
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debugger attached to a bare board, there may not be any notion of
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“process”, and there is often no way to get a core dump. <span class="sc">gdb</span>
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will warn you if it is unable to attach or to read core dumps.
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<p>You can optionally have <code>gdb</code> pass any arguments after the
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executable file to the inferior using <code>--args</code>. This option stops
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option processing.
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<pre class="smallexample"> gdb --args gcc -O2 -c foo.c
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</pre>
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<p>This will cause <code>gdb</code> to debug <code>gcc</code>, and to set
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<code>gcc</code>'s command-line arguments (see <a href="Arguments.html#Arguments">Arguments</a>) to ‘<samp><span class="samp">-O2 -c foo.c</span></samp>’.
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<p>You can run <code>gdb</code> without printing the front material, which describes
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<span class="sc">gdb</span>'s non-warranty, by specifying <code>--silent</code>
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(or <code>-q</code>/<code>--quiet</code>):
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<pre class="smallexample"> gdb --silent
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</pre>
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<p class="noindent">You can further control how <span class="sc">gdb</span> starts up by using command-line
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options. <span class="sc">gdb</span> itself can remind you of the options available.
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<p class="noindent">Type
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<pre class="smallexample"> gdb -help
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</pre>
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<p class="noindent">to display all available options and briefly describe their use
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(‘<samp><span class="samp">gdb -h</span></samp>’ is a shorter equivalent).
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<p>All options and command line arguments you give are processed
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in sequential order. The order makes a difference when the
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‘<samp><span class="samp">-x</span></samp>’ option is used.
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<ul class="menu">
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<li><a accesskey="1" href="File-Options.html#File-Options">File Options</a>: Choosing files
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<li><a accesskey="2" href="Mode-Options.html#Mode-Options">Mode Options</a>: Choosing modes
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<li><a accesskey="3" href="Startup.html#Startup">Startup</a>: What <span class="sc">gdb</span> does during startup
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</ul>
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</body></html>
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