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7b6b167fa3
Commit be54b3777 failed on gmake 3.80 due to a chained conditional, which on closer examination could be removed entirely with some refactoring elsewhere for a net simplification and more robustness against empty expansions. Along the way, add some more comments. Also make explicit in the documentation and comments that built headers are not removed by 'make clean', since we don't typically want that for headers generated by a separate ./configure step, and it's much easier to add your own 'distclean' rule or use EXTRA_CLEAN than to try and override a deletion rule in pgxs.mk. Per buildfarm member prariedog and comments by Michael Paquier, though all the actual changes are my fault.
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/.