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As of 15.4, macOS has strchrnul(), but access to it is blocked behind a check for MACOSX_DEPLOYMENT_TARGET >= 15.4. But our does-it-link configure check finds it, so we try to use it, and fail with the present default deployment target (namely 15.0). This accounts for today's buildfarm failures on indri and sifaka. This is the identical problem that we faced some years ago when Apple introduced preadv and pwritev in the same way. We solved that in commit f014b1b9b by using AC_CHECK_DECLS instead of AC_CHECK_FUNCS to check the functions' availability. So do the same now for strchrnul(). Interestingly, we already had a workaround for "the link check doesn't agree with <string.h>" cases with glibc, which we no longer need since only the header declaration is being checked. Testing this revealed that the meson version of this check has never worked, because it failed to use "-Werror=unguarded-availability-new". (Apparently nobody's tried to build with meson on macOS versions that lack preadv/pwritev as standard.) Adjust that while at it. Also, we had never put support for "-Werror=unguarded-availability-new" into v13, but we need that now. Co-authored-by: Tom Lane <tgl@sss.pgh.pa.us> Co-authored-by: Peter Eisentraut <peter@eisentraut.org> Discussion: https://postgr.es/m/385134.1743523038@sss.pgh.pa.us 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/.