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Tom Lane a39eb9c77f Fix detection and handling of strchrnul() for macOS 15.4. 
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
2025-04-01 16:49:51 -04:00
config Log LLVM library version in configure output. 2023-10-22 14:23:11 +13:00
contrib Prevent assertion failure in contrib/pg_freespacemap. 2025-03-27 13:20:23 -04:00
doc doc: Correct description of values used in FSM for indexes 2025-03-27 10:20:47 +09:00
src Fix detection and handling of strchrnul() for macOS 15.4. 2025-04-01 16:49:51 -04:00
.cirrus.star ci: Prepare to make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
.cirrus.tasks.yml ci: Upgrade FreeBSD image 2025-03-05 10:29:03 -05:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add b334612b8 to .git-blame-ignore-revs. 2023-06-20 09:52:52 -04:00
.gitattributes Exclude LLVM files from whitespace checks 2024-11-27 11:09:38 +01:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Fix detection and handling of strchrnul() for macOS 15.4. 2025-04-01 16:49:51 -04:00
configure.ac Fix detection and handling of strchrnul() for macOS 15.4. 2025-04-01 16:49:51 -04:00
COPYRIGHT Update copyright for 2025 2025-01-01 11:21:54 -05:00
GNUmakefile.in Integrate pg_bsd_indent into our build/test infrastructure. 2023-02-12 12:22:21 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Dynamically find correct installation docs in Makefile. 2022-01-19 14:48:25 +01:00
meson.build Fix detection and handling of strchrnul() for macOS 15.4. 2025-04-01 16:49:51 -04:00
meson_options.txt meson: Attach colon to keyword argument 2023-06-29 12:53:41 +02:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00

README 

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/.