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For the most part, we leave libpq-controlling environment variables alone during "make installcheck", reasoning that connecting to the server the user expects us to connect to may depend on those variables. But that argument doesn't apply to PGDATABASE, since we always want to connect to a specific database name within the server. And failing to unset it causes certain ECPG tests to fail, as various people have complained of in the past. So let's unset it. Possibly this should be back-patched, but I'm disinclined to do that right before 12.0 release. Maybe later. Discussion: https://postgr.es/m/20180318205548.2akxjqvo7hrk5wbc@alap3.anarazel.de Discussion: https://postgr.es/m/E1bOum4-0002EA-2y@gemulon.postgresql.org
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/.
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C
85.2%
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6%
Perl
4.5%
Yacc
1.2%
Meson
0.7%
Other
2.1%