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<chapter id="regress">

<title id="regress-title">Regression Tests</title>

<para>

Each line in the mapping file is of the form

<synopsis>

testname/platformpattern=comparisonfilename

testname:output:platformpattern=comparisonfilename

</synopsis>

The test name is just the name of the particular regression test

module. The platform pattern is a pattern in the style of the Unix

module. The output value indicates which output file to check. For the

standard regression tests, this is always <literal>out</literal>. The

value corresponds to the file extension of the output file.

The platform pattern is a pattern in the style of the Unix

tool <command>expr</> (that is, a regular expression with an implicit

<literal>^</literal> anchor at the start). It is matched against the

platform name as printed by <command>config.guess</command>.

<quote>failure</quote> message on <systemitem>OpenBSD</systemitem>

platforms, <filename>resultmap</filename> includes:

<programlisting>

float8/i.86-.*-openbsd=float8-small-is-zero

float8:out:i.86-.*-openbsd=float8-small-is-zero.out

</programlisting>

which will trigger on any machine for which the output of

<command>config.guess</command> matches <literal>i.86-.*-openbsd</literal>.