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<a name="Dump-files-and-streams"></a>
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Next: <a rel="next" accesskey="n" href="Dump-output-verbosity.html#Dump-output-verbosity">Dump output verbosity</a>,
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Previous: <a rel="previous" accesskey="p" href="Optimization-groups.html#Optimization-groups">Optimization groups</a>,
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Up: <a rel="up" accesskey="u" href="Optimization-info.html#Optimization-info">Optimization info</a>
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<h4 class="subsection">9.7.3 Dump files and streams</h4>
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<p><a name="index-optimization-info-file-names-1704"></a>
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There are two separate output streams available for outputting
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optimization information from passes. Note that both these streams
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accept <code>stderr</code> and <code>stdout</code> as valid streams and thus it is
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possible to dump output to standard output or error. This is specially
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handy for outputting all available information in a single file by
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redirecting <code>stderr</code>.
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<dl>
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<dt><code>pstream</code><dd>This stream is for pass-specific dump output. For example,
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<samp><span class="option">-fdump-tree-vect=foo.v</span></samp> dumps tree vectorization pass output
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into the given file name <samp><span class="file">foo.v</span></samp>. If the file name is not provided,
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the default file name is based on the source file and pass number. Note
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that one could also use special file names <code>stdout</code> and
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<code>stderr</code> for dumping to standard output and standard error
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respectively.
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<br><dt><code>alt_stream</code><dd>This steam is used for printing optimization specific output in
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response to the <samp><span class="option">-fopt-info</span></samp>. Again a file name can be given. If
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the file name is not given, it defaults to <code>stderr</code>.
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</dl>
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