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Tom Lane 12eee85e51 Make our usage of memset_s() conform strictly to the C11 standard. ... 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		8 months ago
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access	Fix typos and grammar in the code	9 months ago
archive	Update copyright for 2025	1 year ago
backup	Update copyright for 2025	1 year ago
bootstrap	pg_noreturn to replace pg_attribute_noreturn()	10 months ago
catalog	Remove pg_replication_origin's TOAST table.	8 months ago
commands	Harmonize function parameter names for Postgres 18.	9 months ago
common	Use 'void *' for arbitrary buffers, 'uint8 *' for byte arrays	8 months ago
datatype	Avoid using timezone Asia/Manila in regression tests.	12 months ago
executor	Change SQL-language functions to use the plan cache.	9 months ago
fe_utils	Remove inappropriate inclusions of c.h and postgres_fe.h.	9 months ago
foreign	Update copyright for 2025	1 year ago
jit	Don't use double-quotes in #include's of system headers, redux.	9 months ago
lib	Use PRI?64 instead of "ll?" in format strings (continued).	10 months ago
libpq	Use 'void *' for arbitrary buffers, 'uint8 *' for byte arrays	8 months ago
mb	With GB18030, prevent SIGSEGV from reading past end of allocation.	8 months ago
nodes	Track the number of presorted outer pathkeys in MergePath	8 months ago
optimizer	Track the number of presorted outer pathkeys in MergePath	8 months ago
parser	Extend ALTER DEFAULT PRIVILEGES to define default privileges for large objects.	9 months ago
partitioning	Fix incorrect #endif comment	10 months ago
pch	Update copyright for 2025	1 year ago
port	Match parameter in new function to earlier equivalents	9 months ago
portability	Update copyright for 2025	1 year ago
postmaster	Add missing PGDLLIMPORT markings	9 months ago
regex	Update copyright for 2025	1 year ago
replication	Remove pg_replication_origin's TOAST table.	8 months ago
rewrite	Refactor ChangeVarNodesExtended() using the custom callback	8 months ago
snowball	Update to latest Snowball sources.	11 months ago
statistics	Stats: use schemaname/relname instead of regclass.	10 months ago
storage	aio: Use runtime arguments with injections points in tests	8 months ago
tcop	Improve error message when standby does accept connections.	9 months ago
tsearch	Update copyright for 2025	1 year ago
utils	Add support for runtime arguments in injection points	8 months ago
.gitignore	Use <stdint.h> and <inttypes.h> for c.h integers.	1 year ago
Makefile	Use <stdint.h> and <inttypes.h> for c.h integers.	1 year ago
c.h	Revert "Use workaround of __builtin_setjmp only on MINGW on MSVCRT"	9 months ago
fmgr.h	Avoid mixing designated and non-designated field initializers.	10 months ago
funcapi.h	Update copyright for 2025	1 year ago
getopt_long.h	IWYU widely useful pragmas	12 months ago
meson.build	Update copyright for 2025	1 year ago
miscadmin.h	Use 'void *' for arbitrary buffers, 'uint8 *' for byte arrays	8 months ago
pg_config.h.in	Make our usage of memset_s() conform strictly to the C11 standard.	8 months ago
pg_config_manual.h	Avoid invalidating all RelationSyncCache entries on publication rename.	10 months ago
pg_getopt.h	IWYU widely useful pragmas	12 months ago
pg_trace.h	IWYU widely useful pragmas	12 months ago
pgstat.h	pgstat: Allow checksum errors to be reported in critical sections	10 months ago
pgtar.h	Update copyright for 2025	1 year ago
pgtime.h	Seek zone abbreviations in the IANA data before timezone_abbreviations.	12 months ago
port.h	Add timingsafe_bcmp(), for constant-time memory comparison	9 months ago
postgres.h	IWYU widely useful pragmas	12 months ago
postgres_ext.h	libpq: Deprecate pg_int64.	10 months ago
postgres_fe.h	IWYU widely useful pragmas	12 months ago
varatt.h	Update copyright for 2025	1 year ago
windowapi.h	Update copyright for 2025	1 year ago