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213 lines
9.0 KiB
HTML
213 lines
9.0 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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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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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>File Options (Debugging with GDB)</title>
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<meta name="description" content="File Options (Debugging with GDB)">
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<meta name="keywords" content="File Options (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Invoking-GDB.html#Invoking-GDB" rel="up" title="Invoking GDB">
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<link href="Mode-Options.html#Mode-Options" rel="next" title="Mode Options">
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<link href="Invoking-GDB.html#Invoking-GDB" rel="prev" title="Invoking GDB">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="File-Options"></a>
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<div class="header">
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<p>
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Next: <a href="Mode-Options.html#Mode-Options" accesskey="n" rel="next">Mode Options</a>, Up: <a href="Invoking-GDB.html#Invoking-GDB" accesskey="u" rel="up">Invoking GDB</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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</div>
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<hr>
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<a name="Choosing-Files"></a>
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<h4 class="subsection">2.1.1 Choosing Files</h4>
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<p>When <small>GDB</small> starts, it reads any arguments other than options as
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specifying an executable file and core file (or process ID). This is
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the same as if the arguments were specified by the ‘<samp>-se</samp>’ and
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‘<samp>-c</samp>’ (or ‘<samp>-p</samp>’) options respectively. (<small>GDB</small> reads the
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first argument that does not have an associated option flag as
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equivalent to the ‘<samp>-se</samp>’ option followed by that argument; and the
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second argument that does not have an associated option flag, if any, as
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equivalent to the ‘<samp>-c</samp>’/‘<samp>-p</samp>’ option followed by that argument.)
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If the second argument begins with a decimal digit, <small>GDB</small> will
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first attempt to attach to it as a process, and if that fails, attempt
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to open it as a corefile. If you have a corefile whose name begins with
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a digit, you can prevent <small>GDB</small> from treating it as a pid by
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prefixing it with <samp>./</samp>, e.g. <samp>./12345</samp>.
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</p>
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<p>If <small>GDB</small> has not been configured to included core file support,
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such as for most embedded targets, then it will complain about a second
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argument and ignore it.
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</p>
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<p>Many options have both long and short forms; both are shown in the
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following list. <small>GDB</small> also recognizes the long forms if you truncate
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them, so long as enough of the option is present to be unambiguous.
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(If you prefer, you can flag option arguments with ‘<samp>--</samp>’ rather
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than ‘<samp>-</samp>’, though we illustrate the more usual convention.)
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</p>
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<dl compact="compact">
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<dt><code>-symbols <var>file</var></code></dt>
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<dt><code>-s <var>file</var></code></dt>
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<dd><a name="index-_002d_002dsymbols"></a>
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<a name="index-_002ds"></a>
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<p>Read symbol table from file <var>file</var>.
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</p>
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</dd>
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<dt><code>-exec <var>file</var></code></dt>
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<dt><code>-e <var>file</var></code></dt>
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<dd><a name="index-_002d_002dexec"></a>
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<a name="index-_002de"></a>
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<p>Use file <var>file</var> as the executable file to execute when appropriate,
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and for examining pure data in conjunction with a core dump.
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</p>
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</dd>
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<dt><code>-se <var>file</var></code></dt>
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<dd><a name="index-_002d_002dse"></a>
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<p>Read symbol table from file <var>file</var> and use it as the executable
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file.
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</p>
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</dd>
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<dt><code>-core <var>file</var></code></dt>
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<dt><code>-c <var>file</var></code></dt>
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<dd><a name="index-_002d_002dcore"></a>
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<a name="index-_002dc"></a>
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<p>Use file <var>file</var> as a core dump to examine.
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</p>
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</dd>
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<dt><code>-pid <var>number</var></code></dt>
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<dt><code>-p <var>number</var></code></dt>
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<dd><a name="index-_002d_002dpid"></a>
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<a name="index-_002dp"></a>
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<p>Connect to process ID <var>number</var>, as with the <code>attach</code> command.
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</p>
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</dd>
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<dt><code>-command <var>file</var></code></dt>
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<dt><code>-x <var>file</var></code></dt>
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<dd><a name="index-_002d_002dcommand"></a>
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<a name="index-_002dx"></a>
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<p>Execute commands from file <var>file</var>. The contents of this file is
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evaluated exactly as the <code>source</code> command would.
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See <a href="Command-Files.html#Command-Files">Command files</a>.
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</p>
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</dd>
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<dt><code>-eval-command <var>command</var></code></dt>
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<dt><code>-ex <var>command</var></code></dt>
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<dd><a name="index-_002d_002deval_002dcommand"></a>
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<a name="index-_002dex"></a>
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<p>Execute a single <small>GDB</small> command.
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</p>
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<p>This option may be used multiple times to call multiple commands. It may
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also be interleaved with ‘<samp>-command</samp>’ as required.
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</p>
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<div class="smallexample">
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<pre class="smallexample">gdb -ex 'target sim' -ex 'load' \
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-x setbreakpoints -ex 'run' a.out
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</pre></div>
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</dd>
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<dt><code>-init-command <var>file</var></code></dt>
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<dt><code>-ix <var>file</var></code></dt>
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<dd><a name="index-_002d_002dinit_002dcommand"></a>
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<a name="index-_002dix"></a>
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<p>Execute commands from file <var>file</var> before loading the inferior (but
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after loading gdbinit files).
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See <a href="Startup.html#Startup">Startup</a>.
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</p>
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</dd>
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<dt><code>-init-eval-command <var>command</var></code></dt>
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<dt><code>-iex <var>command</var></code></dt>
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<dd><a name="index-_002d_002dinit_002deval_002dcommand"></a>
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<a name="index-_002diex"></a>
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<p>Execute a single <small>GDB</small> command before loading the inferior (but
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after loading gdbinit files).
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See <a href="Startup.html#Startup">Startup</a>.
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</p>
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</dd>
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<dt><code>-directory <var>directory</var></code></dt>
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<dt><code>-d <var>directory</var></code></dt>
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<dd><a name="index-_002d_002ddirectory"></a>
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<a name="index-_002dd"></a>
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<p>Add <var>directory</var> to the path to search for source and script files.
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</p>
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</dd>
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<dt><code>-r</code></dt>
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<dt><code>-readnow</code></dt>
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<dd><a name="index-_002d_002dreadnow"></a>
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<a name="index-_002dr"></a>
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<p>Read each symbol file’s entire symbol table immediately, rather than
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the default, which is to read it incrementally as it is needed.
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This makes startup slower, but makes future operations faster.
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</p>
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</dd>
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<dt><code>--readnever</code></dt>
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<dd><a name="g_t_002d_002dreadnever"></a><a name="index-_002d_002dreadnever_002c-command_002dline-option"></a>
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<p>Do not read each symbol file’s symbolic debug information. This makes
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startup faster but at the expense of not being able to perform
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symbolic debugging. DWARF unwind information is also not read,
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meaning backtraces may become incomplete or inaccurate. One use of
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this is when a user simply wants to do the following sequence: attach,
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dump core, detach. Loading the debugging information in this case is
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an unnecessary cause of delay.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Mode-Options.html#Mode-Options" accesskey="n" rel="next">Mode Options</a>, Up: <a href="Invoking-GDB.html#Invoking-GDB" accesskey="u" rel="up">Invoking GDB</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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</div>
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</body>
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</html>
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