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<title>Debugging with GDB: Messages/Warnings</title>
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<a name="Messages_002fWarnings"></a>
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<div class="header">
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<p>
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Next: <a href="Debugging-Output.html#Debugging-Output" accesskey="n" rel="next">Debugging Output</a>, Previous: <a href="Auto_002dloading.html#Auto_002dloading" accesskey="p" rel="previous">Auto-loading</a>, Up: <a href="Controlling-GDB.html#Controlling-GDB" accesskey="u" rel="up">Controlling 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="Optional-Warnings-and-Messages"></a>
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<h3 class="section">22.9 Optional Warnings and Messages</h3>
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<a name="index-verbose-operation"></a>
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<a name="index-optional-warnings"></a>
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<p>By default, <small>GDB</small> is silent about its inner workings. If you are
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running on a slow machine, you may want to use the <code>set verbose</code>
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command. This makes <small>GDB</small> tell you when it does a lengthy
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internal operation, so you will not think it has crashed.
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</p>
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<p>Currently, the messages controlled by <code>set verbose</code> are those
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which announce that the symbol table for a source file is being read;
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see <code>symbol-file</code> in <a href="Files.html#Files">Commands to Specify Files</a>.
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</p>
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<dl compact="compact">
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<dd><a name="index-set-verbose"></a>
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</dd>
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<dt><code>set verbose on</code></dt>
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<dd><p>Enables <small>GDB</small> output of certain informational messages.
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</p>
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</dd>
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<dt><code>set verbose off</code></dt>
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<dd><p>Disables <small>GDB</small> output of certain informational messages.
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</p>
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<a name="index-show-verbose"></a>
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</dd>
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<dt><code>show verbose</code></dt>
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<dd><p>Displays whether <code>set verbose</code> is on or off.
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</p></dd>
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</dl>
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<p>By default, if <small>GDB</small> encounters bugs in the symbol table of an
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object file, it is silent; but if you are debugging a compiler, you may
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find this information useful (see <a href="Symbol-Errors.html#Symbol-Errors">Errors Reading
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Symbol Files</a>).
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</p>
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<dl compact="compact">
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<dd>
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<a name="index-set-complaints"></a>
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</dd>
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<dt><code>set complaints <var>limit</var></code></dt>
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<dd><p>Permits <small>GDB</small> to output <var>limit</var> complaints about each type of
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unusual symbols before becoming silent about the problem. Set
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<var>limit</var> to zero to suppress all complaints; set it to a large number
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to prevent complaints from being suppressed.
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</p>
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<a name="index-show-complaints"></a>
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</dd>
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<dt><code>show complaints</code></dt>
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<dd><p>Displays how many symbol complaints <small>GDB</small> is permitted to produce.
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</p>
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</dd>
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</dl>
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<a name="confirmation-requests"></a><p>By default, <small>GDB</small> is cautious, and asks what sometimes seems to be a
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lot of stupid questions to confirm certain commands. For example, if
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you try to run a program which is already running:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) run
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The program being debugged has been started already.
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Start it from the beginning? (y or n)
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</pre></div>
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<p>If you are willing to unflinchingly face the consequences of your own
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commands, you can disable this “feature”:
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</p>
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<dl compact="compact">
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<dd>
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<a name="index-set-confirm"></a>
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<a name="index-flinching"></a>
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<a name="index-confirmation"></a>
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<a name="index-stupid-questions"></a>
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</dd>
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<dt><code>set confirm off</code></dt>
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<dd><p>Disables confirmation requests. Note that running <small>GDB</small> with
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the <samp>--batch</samp> option (see <a href="Mode-Options.html#Mode-Options">-batch</a>) also
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automatically disables confirmation requests.
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</p>
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</dd>
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<dt><code>set confirm on</code></dt>
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<dd><p>Enables confirmation requests (the default).
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</p>
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<a name="index-show-confirm"></a>
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</dd>
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<dt><code>show confirm</code></dt>
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<dd><p>Displays state of confirmation requests.
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</p>
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</dd>
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</dl>
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<a name="index-command-tracing"></a>
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<p>If you need to debug user-defined commands or sourced files you may find it
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useful to enable <em>command tracing</em>. In this mode each command will be
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printed as it is executed, prefixed with one or more ‘<samp>+</samp>’ symbols, the
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quantity denoting the call depth of each command.
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</p>
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<dl compact="compact">
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<dd><a name="index-set-trace_002dcommands"></a>
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<a name="index-command-scripts_002c-debugging"></a>
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</dd>
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<dt><code>set trace-commands on</code></dt>
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<dd><p>Enable command tracing.
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</p></dd>
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<dt><code>set trace-commands off</code></dt>
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<dd><p>Disable command tracing.
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</p></dd>
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<dt><code>show trace-commands</code></dt>
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<dd><p>Display the current state of command tracing.
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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="Debugging-Output.html#Debugging-Output" accesskey="n" rel="next">Debugging Output</a>, Previous: <a href="Auto_002dloading.html#Auto_002dloading" accesskey="p" rel="previous">Auto-loading</a>, Up: <a href="Controlling-GDB.html#Controlling-GDB" accesskey="u" rel="up">Controlling 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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