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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 "failures" for a particular platform,
you must choose or make a variant result file, and then add a line
to the mapping file, which is "resultmap".
Each line in the mapping file is of the form
testname/platformnamepattern=comparisonfilename
The test name is just the name of the particular regression test module.
The platform name pattern is a pattern in the style of expr(1) (that is,
a regular expression with an implicit ^ anchor at the start). It is matched
against the platform name as printed by config.guess. The comparison
file name is the name of the substitute result comparison file.
For example: the int2 regress test includes a deliberate entry of a value
that is too large to fit in int2. The specific error message that is
produced is platform-dependent; our reference platform emits
ERROR: pg_atoi: error reading "100000": Numerical result out of range
but a fair number of other Unix platforms emit
ERROR: pg_atoi: error reading "100000": Result too large
Therefore, we provide a variant comparison file, int2-too-large.out,
that includes this spelling of the error message. To silence the
bogus "failure" message on HPPA platforms, resultmap includes
int2/hppa=int2-too-large
which will trigger on any machine for which config.guess's output
begins with 'hppa'. Other lines in resultmap select the variant
comparison file for other platforms where it's appropriate.
