db: fix build with clang 16 on Darwin

Both `_spin_lock_try` and `_spin_unlock` are private and deprecated
APIs, which are not exported by any headers in the SDK. The build fails
because the configure script does not define the functions before
calling them, which is treated as error by clang 16.

This patch replaces use of those APIs with `os_unfair_lock`, which is
the recommended replacement per the deprecation messages.

pkgs/development/libraries/db/darwin-mutexes-4.8.patch

@@ -0,0 +1,55 @@
+diff -ur a/dist/aclocal/mutex.m4 b/dist/aclocal/mutex.m4
+--- a/dist/aclocal/mutex.m4	1969-12-31 19:00:01.000000000 -0500
++++ b/dist/aclocal/mutex.m4	2023-06-05 19:14:47.214158196 -0400
+@@ -372,10 +376,11 @@
+
+ # _spin_lock_try/_spin_unlock: Apple/Darwin
+ if test "$db_cv_mutex" = no; then
+-AC_TRY_LINK(,[
+-	int x;
+-	_spin_lock_try(&x);
+-	_spin_unlock(&x);
++AC_TRY_LINK([
++#include <os/lock.h>],[
++	os_unfair_lock x = OS_UNFAIR_LOCK_INIT;
++	bool _ = os_unfair_lock_trylock(&x);
++	os_unfair_lock_unlock(&x);
+ ], [db_cv_mutex=Darwin/_spin_lock_try])
+ fi
+
+diff -ur a/dbinc/mutex_int.h b/dbinc/mutex_int.h
+--- a/dbinc/mutex_int.h	1969-12-31 19:00:01.000000000 -0500
++++ b/dbinc/mutex_int.h	2023-06-05 19:15:37.510514745 -0400
+@@ -154,14 +154,13 @@
+  * Apple/Darwin library functions.
+  *********************************************************************/
+ #ifdef HAVE_MUTEX_DARWIN_SPIN_LOCK_TRY
+-typedef u_int32_t tsl_t;
++#include <os/lock.h>
++typedef os_unfair_lock tsl_t;
+
+ #ifdef LOAD_ACTUAL_MUTEX_CODE
+-extern int _spin_lock_try(tsl_t *);
+-extern void _spin_unlock(tsl_t *);
+-#define	MUTEX_SET(tsl)          _spin_lock_try(tsl)
+-#define	MUTEX_UNSET(tsl)        _spin_unlock(tsl)
+-#define	MUTEX_INIT(tsl)         (MUTEX_UNSET(tsl), 0)
++#define	MUTEX_SET(tsl)          os_unfair_lock_trylock(tsl)
++#define	MUTEX_UNSET(tsl)        os_unfair_lock_unlock(tsl)
++#define	MUTEX_INIT(tsl)         ({ *(tsl) = OS_UNFAIR_LOCK_INIT; tsl; })
+ #endif
+ #endif
+
+diff -ur a/dbinc/mutex_int.h b/dbinc/mutex_int.h
+--- a/dbinc_auto/mutex_ext.h	1969-12-31 19:00:01.000000000 -0500
++++ b/dbinc_auto/mutex_ext.h	2023-07-01 22:38:20.749201366 -0400
+@@ -34,6 +34,9 @@
+ #if !defined(HAVE_ATOMIC_SUPPORT) && defined(HAVE_MUTEX_SUPPORT)
+ atomic_value_t __atomic_dec __P((ENV *, db_atomic_t *));
+ #endif
++#if !defined(HAVE_ATOMIC_SUPPORT) && defined(HAVE_MUTEX_SUPPORT)
++int atomic_compare_exchange __P((ENV *, db_atomic_t *, atomic_value_t, atomic_value_t));
++#endif
+ int __db_pthread_mutex_init __P((ENV *, db_mutex_t, u_int32_t));
+ int __db_pthread_mutex_lock __P((ENV *, db_mutex_t));
+ #if defined(HAVE_SHARED_LATCHES)

pkgs/development/libraries/db/darwin-mutexes.patch

@@ -0,0 +1,42 @@
+diff -ur a/dist/aclocal/mutex.m4 b/dist/aclocal/mutex.m4
+--- a/dist/aclocal/mutex.m4	1969-12-31 19:00:01.000000000 -0500
++++ b/dist/aclocal/mutex.m4	2023-06-05 19:14:47.214158196 -0400
+@@ -441,10 +445,11 @@
+
+ # _spin_lock_try/_spin_unlock: Apple/Darwin
+ if test "$db_cv_mutex" = no; then
+-AC_TRY_LINK(,[
+-	int x;
+-	_spin_lock_try(&x);
+-	_spin_unlock(&x);
++AC_TRY_LINK([
++#include <os/lock.h>],[
++	os_unfair_lock x = OS_UNFAIR_LOCK_INIT;
++	bool _ = os_unfair_lock_trylock(&x);
++	os_unfair_lock_unlock(&x);
+ ], [db_cv_mutex=Darwin/_spin_lock_try])
+ fi
+
+diff -ur a/src/dbinc/mutex_int.h b/src/dbinc/mutex_int.h
+--- a/src/dbinc/mutex_int.h	1969-12-31 19:00:01.000000000 -0500
++++ b/src/dbinc/mutex_int.h	2023-06-05 19:15:37.510514745 -0400
+@@ -154,14 +154,13 @@
+  * Apple/Darwin library functions.
+  *********************************************************************/
+ #ifdef HAVE_MUTEX_DARWIN_SPIN_LOCK_TRY
+-typedef u_int32_t tsl_t;
++#include <os/lock.h>
++typedef os_unfair_lock tsl_t;
+
+ #ifdef LOAD_ACTUAL_MUTEX_CODE
+-extern int _spin_lock_try(tsl_t *);
+-extern void _spin_unlock(tsl_t *);
+-#define	MUTEX_SET(tsl)          _spin_lock_try(tsl)
+-#define	MUTEX_UNSET(tsl)        _spin_unlock(tsl)
+-#define	MUTEX_INIT(tsl)         (MUTEX_UNSET(tsl), 0)
++#define	MUTEX_SET(tsl)          os_unfair_lock_trylock(tsl)
++#define	MUTEX_UNSET(tsl)        os_unfair_lock_unlock(tsl)
++#define	MUTEX_INIT(tsl)         ({ *(tsl) = OS_UNFAIR_LOCK_INIT; tsl; })
+ #endif
+ #endif
+

pkgs/development/libraries/db/db-4.8.nix

@@ -3,7 +3,8 @@
 import ./generic.nix (args // {
   version = "4.8.30";
   sha256 = "0ampbl2f0hb1nix195kz1syrqqxpmvnvnfvphambj7xjrl3iljg0";
-  extraPatches = [ ./clang-4.8.patch ./CVE-2017-10140-4.8-cwd-db_config.patch ];
+  extraPatches = [ ./clang-4.8.patch ./CVE-2017-10140-4.8-cwd-db_config.patch ]
+    ++ lib.optionals stdenv.isDarwin [ ./darwin-mutexes-4.8.patch ];
 
   drvArgs.hardeningDisable = [ "format" ];
   drvArgs.doCheck = false;

pkgs/development/libraries/db/db-5.3.nix

@@ -3,5 +3,6 @@
 import ./generic.nix (args // {
   version = "5.3.28";
   sha256 = "0a1n5hbl7027fbz5lm0vp0zzfp1hmxnz14wx3zl9563h83br5ag0";
-  extraPatches = [ ./clang-5.3.patch ./CVE-2017-10140-cwd-db_config.patch ];
+  extraPatches = [ ./clang-5.3.patch ./CVE-2017-10140-cwd-db_config.patch ]
+    ++ lib.optionals stdenv.isDarwin [ ./darwin-mutexes.patch ];
 })

pkgs/development/libraries/db/db-6.0.nix

@@ -4,5 +4,6 @@ import ./generic.nix (args // {
   version = "6.0.20";
   sha256 = "00r2aaglq625y8r9xd5vw2y070plp88f1mb2gbq3kqsl7128lsl0";
   license = lib.licenses.agpl3;
-  extraPatches = [ ./clang-6.0.patch ./CVE-2017-10140-cwd-db_config.patch ];
+  extraPatches = [ ./clang-6.0.patch ./CVE-2017-10140-cwd-db_config.patch ]
+    ++ lib.optionals stdenv.isDarwin [ ./darwin-mutexes.patch ];
 })

pkgs/development/libraries/db/db-6.2.nix

@@ -4,5 +4,6 @@ import ./generic.nix (args // {
   version = "6.2.23";
   sha256 = "1isxx4jfmnh913jzhp8hhfngbk6dsg46f4kjpvvc56maj64jqqa7";
   license = lib.licenses.agpl3;
-  extraPatches = [ ./clang-6.0.patch ./CVE-2017-10140-cwd-db_config.patch ];
+  extraPatches = [ ./clang-6.0.patch ./CVE-2017-10140-cwd-db_config.patch ]
+    ++ lib.optionals stdenv.isDarwin [ ./darwin-mutexes.patch ];
 })