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| <title>Debugging with GDB: Invoking GDB</title> |
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| <a name="Invoking-GDB"></a> |
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| 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> [<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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| <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, if you want |
| to debug a running process: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">gdb <var>program</var> 1234 |
| </pre></div> |
| |
| <p>would attach <small>GDB</small> to process <code>1234</code> (unless you also have a file |
| named <samp>1234</samp>; <small>GDB</small> does check for a core file first). |
| </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 |
| “process”, 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>’s command-line arguments (see <a href="Arguments.html#Arguments">Arguments</a>) to ‘<samp>-O2 -c foo.c</samp>’. |
| </p> |
| <p>You can run <code>gdb</code> without printing the front material, which describes |
| <small>GDB</small>’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 |
| (‘<samp>gdb -h</samp>’ 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 |
| ‘<samp>-x</samp>’ option is used. |
| </p> |
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| <tr><td align="left" valign="top">• <a href="File-Options.html#File-Options" accesskey="1">File Options</a>:</td><td> </td><td align="left" valign="top">Choosing files |
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| <tr><td align="left" valign="top">• <a href="Mode-Options.html#Mode-Options" accesskey="2">Mode Options</a>:</td><td> </td><td align="left" valign="top">Choosing modes |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Startup.html#Startup" accesskey="3">Startup</a>:</td><td> </td><td align="left" valign="top">What <small>GDB</small> does during startup |
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| 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> [<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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