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To build with -Dreadline=enabled one can use either readline or libedit. The -Dlibedit_preferred flag is supposed to control the order of names to lookup. This works fine when either both libraries are present or -Dreadline is set to auto. However, explicitly enabling readline with only libedit present, but not setting libedit_preferred, or alternatively enabling readline with only readline present, but setting libedit_preferred, too, are both broken. This is because cc.find_library will throw an error for a not found dependency as soon as the first required dependency is checked, thus it's impossible to fallback to the alternative. Here we only check the second of the two dependencies for requiredness, thus we only fail when none of the two can be found. Author: Wolfgang Walther Reviewed-by: Nazir Bilal Yavuz, Alvaro Herrera, Peter Eisentraut Reviewed-by: Tristan Partin Discussion: https://www.postgresql.org/message-id/ca8f37e1-a2c3-40e2-91f6-59c3d3652ad4@technowledgy.de Backpatch: 16-, where meson support was added
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/.