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test_regex_utf8 decides whether to run by looking at the database encoding alone, but two of its cases, [[:graph:]] and [[:print:]] over E'xᔀሷ', depend on the ctype as well. In a database with encoding UTF8 and locale C they match just the x, because isgraph() and isprint() are false for anything outside ASCII, and the file fails. No buildfarm animal builds such a cluster, which is why this went unnoticed. A pending buildfarm client change will let an animal be configured that way. Fix by providing a second expected file holding the C-ctype answers, in the manner of json_encoding.sql, which carries expected files for UTF8 and for SQL_ASCII. The .sql needs no change. This applies to releases 15 and 16 only. A better solution is available for release 17 and up. Backpatch to v15, v16 only.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.