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Some older compilers otherwise sometimes complain about undefined values, even though the return value should not be used in the overflow case. We assume that any decent compiler will optimize away the unnecessary assignment in performance critical cases. We do not want to restrain the returned value to a specific value, e.g. 0 or the wrapped-around value, because some fast ways to implement overflow detecting math do not easily allow for that (e.g. msvc intrinsics). As the function documentation already documents the returned value in case of intrinsics to be implementation defined, no documentation has to be updated. Per complaint from Tom Lane and his buildfarm member prairiedog. Author: Andres Freund Discussion: https://postgr.es/m/18169.1513958454@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/.