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<a name="Debug-Output"></a>
<div class="header">
<p>
Previous: <a href="Debug-Levels.html#Debug-Levels" accesskey="p" rel="prev">Debug Levels</a>, Up: <a href="Debugging.html#Debugging" accesskey="u" rel="up">Debugging</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Indices.html#Indices" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Saving-debugging-output"></a>
<h3 class="section">7.4 Saving debugging output</h3>

<a name="index-saving-debugging-output"></a>
<a name="index-debugging-output_002c-saving"></a>
<a name="index-output_002c-saving-debugging"></a>
<a name="index-GNU-extensions-6"></a>
<p>Debug and tracing output can be redirected to files using either the
<samp>--debugfile</samp> option to <code>m4</code> (see <a href="Debugging-options.html#Debugging-options">Invoking m4</a>), or with the builtin macro <code>debugfile</code>:
</p>
<dl>
<dt><a name="index-debugfile"></a>Builtin: <strong>debugfile</strong> <em>(<span class="roman">[</span><var>file</var><span class="roman">]</span>)</em></dt>
<dd><p>Sends all further debug and trace output to <var>file</var>, opened in append
mode.  If <var>file</var> is the empty string, debug and trace output are
discarded.  If <code>debugfile</code> is called without any arguments, debug
and trace output are sent to standard error.  This does not affect
warnings, error messages, or <code>errprint</code> output, which are
always sent to standard error.  If <var>file</var> cannot be opened, the
current debug file is unchanged, and an error is issued.
</p>
<p>The expansion of <code>debugfile</code> is void.
</p></dd></dl>

<div class="example">
<pre class="example">$ <kbd>m4 -d</kbd>
traceon(`divnum')
&rArr;
divnum(`extra')
error&rarr;m4:stdin:2: Warning: excess arguments to builtin `divnum' ignored
error&rarr;m4trace: -1- divnum(`extra') -&gt; `0'
&rArr;0
debugfile()
&rArr;
divnum(`extra')
error&rarr;m4:stdin:4: Warning: excess arguments to builtin `divnum' ignored
&rArr;0
debugfile
&rArr;
divnum
error&rarr;m4trace: -1- divnum -&gt; `0'
&rArr;0
</pre></div>




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