It seems to me that this code in pg_upgrade/check.c has been useless
since at least version 9.1:

    /* Is it 9.0 but without tablespace directories? */
    if (GET_MAJOR_VERSION(new_cluster.major_version) == 900 &&
        new_cluster.controldata.cat_ver < TABLE_SPACE_SUBDIRS_CAT_VER)
        pg_fatal("This utility can only upgrade to PostgreSQL version
9.0 after 2010-01-11\n"
                 "because of backend API changes made during

Peter Eisentraut    
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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