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cd0be131ba
get_pg_version() is able to return a version number, that can be used for comparisons based on PG_VERSION_NUM. A macro is added to convert the result to a major version number, to work with PG_MAJORVERSION_NUM. It is possible to pass to the routine an optional argument, where the contents retrieved from PG_VERSION are saved. This requirement matters for some of the frontend code (one example: pg_upgrade wants that for tablespace paths with a version number strictly older than v10). This will be used by a set of follow-up patches, to be consumed in various frontend tools that duplicate a logic similar to do what this new routine does, like: - pg_resetwal - pg_combinebackup - pg_createsubscriber - pg_upgrade This routine supports both the post-v10 version number and the older flavor (aka 9.6), as required at least by pg_upgrade. Author: Michael Paquier <michael@paquier.xyz> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Discussion: https://postgr.es/m/aOiirvWJzwdVCXph@paquier.xyz