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We have a project policy that every .c file should start by including postgres.h, postgres_fe.h, or c.h as appropriate; and then there is no need for any .h file to explicitly include any of these. (The core reason for this policy is to make it easy to verify that pg_config_os.h is included before any system headers such as <stdio.h>; without that, we have portability issues on some platforms due to variation in largefile options across different modules in the backend. Also, if .h files were responsible for choosing which of these key headers to include, .h files that need to be includable in either frontend or backend compiles would be in trouble.) plpgsql was blithely ignoring this policy, so whack it upside the head until it complies. I also chose to standardize on including plpgsql's own .h files after all core-system headers that it pulls in. That could've been done either way, but this way seems saner. Discussion: https://postgr.es/m/CAEepm=2zCoeq3QxVwhS5DFeUh=yU6z81pbWMgfOB8OzyiBwxzw@mail.gmail.com Discussion: https://postgr.es/m/11634.1488932128@sss.pgh.pa.us
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.