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>26.3. Platform-specific comparison files</A
></H1
><P
> Since some of the tests inherently produce platform-specific
results, we have provided a way to supply platform-specific result
comparison files. Frequently, the same variation applies to
multiple platforms; rather than supplying a separate comparison
file for every platform, there is a mapping file that defines
which comparison file to use. So, to eliminate bogus test
<SPAN
CLASS="QUOTE"
>"failures"</SPAN
> for a particular platform, you must choose
or make a variant result file, and then add a line to the mapping
file, which is <TT
CLASS="FILENAME"
>src/test/regress/resultmap</TT
>.
</P
><P
> Each line in the mapping file is of the form
</P><PRE
CLASS="SYNOPSIS"
>testname/platformpattern=comparisonfilename</PRE
><P>
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
tool <TT
CLASS="COMMAND"
>expr</TT
> (that is, a regular expression with an implicit
<TT
CLASS="LITERAL"
>^</TT
> anchor
at the start). It is matched against the platform name as printed
by <TT
CLASS="COMMAND"
>config.guess</TT
> followed by
<TT
CLASS="LITERAL"
>:gcc</TT
> or <TT
CLASS="LITERAL"
>:cc</TT
>, depending on
whether you use the GNU compiler or the system's native compiler
(on systems where there is a difference). The comparison file
name is the name of the substitute result comparison file.
</P
><P
> For example: some systems interpret very small floating-point values
as zero, rather than reporting an underflow error. This causes a
few differences in the <TT
CLASS="FILENAME"
>float8</TT
> regression test.
Therefore, we provide a variant comparison file,
<TT
CLASS="FILENAME"
>float8-small-is-zero.out</TT
>, which includes
the results to be expected on these systems. To silence the bogus
<SPAN
CLASS="QUOTE"
>"failure"</SPAN
> message on <SPAN
CLASS="SYSTEMITEM"
>OpenBSD</SPAN
>
platforms, <TT
CLASS="FILENAME"
>resultmap</TT
> includes
</P><PRE
CLASS="PROGRAMLISTING"
>float8/i.86-.*-openbsd=float8-small-is-zero</PRE
><P>
which will trigger on any machine for which the output of
<TT
CLASS="COMMAND"
>config.guess</TT
> matches <TT
CLASS="LITERAL"
>i.86-.*-openbsd</TT
>.
Other lines
in <TT
CLASS="FILENAME"
>resultmap</TT
> select the variant comparison file for other
platforms where it's appropriate.
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