db: now builds on darwin with libc++-3.8

pkgs/development/libraries/db/clang-5.3.patch

@@ -38,6 +38,19 @@ index 6a858f7..9f338dc 100644
  #else
  #define atomic_inc(env, p)	__atomic_inc(env, p)
  #define atomic_dec(env, p)	__atomic_dec(env, p)
+diff --git a/src/dbinc/db.in b/src/dbinc/db.in
+index 92ac822..f80428e 100644
+--- a/src/dbinc/db.in
++++ b/src/dbinc/db.in
+@@ -2782,7 +2782,7 @@ typedef struct {
+ #define	fetch(a)	__db_dbm_fetch@DB_VERSION_UNIQUE_NAME@(a)
+ #define	firstkey	__db_dbm_firstkey@DB_VERSION_UNIQUE_NAME@
+ #define	nextkey(a)	__db_dbm_nextkey@DB_VERSION_UNIQUE_NAME@(a)
+-#define	store(a, b)	__db_dbm_store@DB_VERSION_UNIQUE_NAME@(a, b)
++#define	store_db(a, b)	__db_dbm_store@DB_VERSION_UNIQUE_NAME@(a, b)
+ 
+ /*******************************************************
+  * Hsearch historic interface.
 diff --git a/src/mp/mp_fget.c b/src/mp/mp_fget.c
 index 16de695..d0dcc29 100644
 --- a/src/mp/mp_fget.c

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

@@ -3,6 +3,9 @@
 import ./generic.nix (args // rec {
   version = "5.3.28";
   sha256 = "0a1n5hbl7027fbz5lm0vp0zzfp1hmxnz14wx3zl9563h83br5ag0";
-  extraPatches = [ ./clang-5.3.patch ];
   branch = "5.3";
+  # https://community.oracle.com/thread/3952592
+  # this patch renames some sybols that conflict with libc++-3.8
+  # symbols: atomic_compare_exchange, atomic_init, store
+  extraPatches = [ ./clang-5.3.patch ];
 })