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The GET/SET_n_BYTES macros are meant to be infrastructure for the DatumGetFoo/FooGetDatum macros, which include a cast to the intended target type. Using them directly without a cast, as DatumGetFloat4 and friends previously did, can yield warnings when -Wconversion is on. This is of little significance when building Postgres proper, because there are such a huge number of such warnings in the server that nobody would think -Wconversion is of any use. But some extensions build with -Wconversion due to outside constraints. Commit 14cca1bf8 did a disservice to those extensions by moving DatumGetFloat4 et al into postgres.h, where they can now cause warnings in extension builds. To fix, use DatumGetInt32 and friends in place of the low-level macros. This is arguably a bit cleaner anyway. Chapman Flack Discussion: https://postgr.es/m/592E4D04.1070609@anastigmatix.net
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/.