Newer compilers warned about extern int _CRT_glob = 0; which is indeed a mysterious C construction, as it combines "extern" and an initialization. It turns out that according to the C standard, the "extern" is ignored here, so we can remove it to resolve the warnings. But then we also need to add a real extern declaration (without initializer) to satisfy -Wmissing-variable-declarations. (Note that this code is only active on MinGW.) Discussion: https://www.postgresql.org/message-id/1053279b-da01-4eb4-b7a3-da6b5d8f73d1%40eisentraut.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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.