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We allow our header files to depend on the appropriate one of postgres.h, postgres_fe.h, or c.h having already been included. However, there are a few headers such as libpq-fe.h that are meant to be used by client applications and therefore must compile without any assumptions about previous inclusions. These test scripts failed to consider that, which seems quite hazardous since we might not immediately notice such a problem otherwise. Hence, adjust these scripts to test relevant libpq and ecpg headers with no prior inclusion. While at it, we can also make an effort to actually use the relevant one of postgres.h, postgres_fe.h, or c.h. I added some rules that guess which one to use based on the first-level src subdirectory, e.g. use postgres_fe.h under src/bin/. These rules are hardly water-tight but they seem to work today, and we can always refine them in the future. These changes don't reveal any live problems today, which is good, but they should make these scripts more able to catch future bugs. Discussion: https://postgr.es/m/2488193.1677863247@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: 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/.