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Per the letter of the C11 standard, one must #define __STDC_WANT_LIB_EXT1__ as 1 before including <string.h> in order to have access to memset_s(). It appears that many platforms are lenient about this, because we weren't doing it and yet the code appeared to work anyway. But we now find that with -std=c11, macOS is strict and doesn't declare memset_s, leading to compile failures since we try to use it anyway. (Given the lack of prior reports, perhaps this is new behavior in the latest SDK? No matter, we're clearly in the wrong.) In addition to the immediate problem, which could be fixed merely by adding the needed #define to explicit_bzero.c, it seems possible that our configure-time probe for memset_s() could fail in case a platform implements the function in some odd way due to this spec requirement. This concern can be fixed in largely the same way that we dealt with strchrnul() in 6da2ba1d8: switch to using a declaration-based configure probe instead of a does-it-link probe. Back-patch to v13 where we started using memset_s(). Reported-by: Lakshmi Narayana Velayudam <dev.narayana.v@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAA4pTnLcKGG78xeOjiBr5yS7ZeE-Rh=FaFQQGOO=nPzA1L8yEA@mail.gmail.com Backpatch-through: 13
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/.