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126 lines
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<title>Messages/Warnings - Debugging with GDB</title>
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<a name="Messages%2fWarnings"></a>
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<a name="Messages_002fWarnings"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Debugging-Output.html#Debugging-Output">Debugging Output</a>,
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Previous: <a rel="previous" accesskey="p" href="Auto_002dloading.html#Auto_002dloading">Auto-loading</a>,
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Up: <a rel="up" accesskey="u" href="Controlling-GDB.html#Controlling-GDB">Controlling GDB</a>
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<h3 class="section">22.9 Optional Warnings and Messages</h3>
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<p><a name="index-verbose-operation-1730"></a><a name="index-optional-warnings-1731"></a>By default, <span class="sc">gdb</span> 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 <span class="sc">gdb</span> 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>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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<a name="index-set-verbose-1732"></a>
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<dl><dt><code>set verbose on</code><dd>Enables <span class="sc">gdb</span> output of certain informational messages.
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<br><dt><code>set verbose off</code><dd>Disables <span class="sc">gdb</span> output of certain informational messages.
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<p><a name="index-show-verbose-1733"></a><br><dt><code>show verbose</code><dd>Displays whether <code>set verbose</code> is on or off.
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</dl>
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<p>By default, if <span class="sc">gdb</span> 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 Symbol Files</a>).
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<a name="index-set-complaints-1734"></a>
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<dl><dt><code>set complaints </code><var>limit</var><dd>Permits <span class="sc">gdb</span> 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><a name="index-show-complaints-1735"></a><br><dt><code>show complaints</code><dd>Displays how many symbol complaints <span class="sc">gdb</span> is permitted to produce.
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</dl>
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<p><a name="confirmation-requests"></a>By default, <span class="sc">gdb</span> 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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<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>
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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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<a name="index-set-confirm-1736"></a>
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<a name="index-flinching-1737"></a>
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<a name="index-confirmation-1738"></a>
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<a name="index-stupid-questions-1739"></a>
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<dl><dt><code>set confirm off</code><dd>Disables confirmation requests. Note that running <span class="sc">gdb</span> with
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the <samp><span class="option">--batch</span></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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<br><dt><code>set confirm on</code><dd>Enables confirmation requests (the default).
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<p><a name="index-show-confirm-1740"></a><br><dt><code>show confirm</code><dd>Displays state of confirmation requests.
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</dl>
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<p><a name="index-command-tracing-1741"></a>If you need to debug user-defined commands or sourced files you may find it
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useful to enable <dfn>command tracing</dfn>. In this mode each command will be
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printed as it is executed, prefixed with one or more ‘<samp><span class="samp">+</span></samp>’ symbols, the
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quantity denoting the call depth of each command.
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<a name="index-set-trace_002dcommands-1742"></a>
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<a name="index-command-scripts_002c-debugging-1743"></a>
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<dl><dt><code>set trace-commands on</code><dd>Enable command tracing.
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<br><dt><code>set trace-commands off</code><dd>Disable command tracing.
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<br><dt><code>show trace-commands</code><dd>Display the current state of command tracing.
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</dl>
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