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Platform-specific comparison files

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

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
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.