db: Fix atomic function namespace clash with clang builtins

Rename local function to avoid conflicts with compiler intrinsics

(From OE-Core rev: fcfbbae9fdda539665a1e8bfe292f917bd5a1927)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/db/db/0001-atomic-Rename-local-__atomic_compare_exchange-to-avo.patch

@@ -0,0 +1,45 @@
+From 29621d637e30982489693f2e207ce6a1790e3337 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Wed, 22 Mar 2017 15:32:26 +0000
+Subject: [PATCH] atomic: Rename local __atomic_compare_exchange to avoid clash
+ with builtins
+
+Helps building with clang
+
+Fixes
+
+../db-5.3.28/src/dbinc/atomic.h:179:19: error: definition of builtin function '__atomic_compare_exchange'
+static inline int __atomic_compare_exchange(
+
+Upstream-Status: Pending
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ src/dbinc/atomic.h | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/dbinc/atomic.h b/src/dbinc/atomic.h
+index 6a858f7..1b49de5 100644
+--- a/src/dbinc/atomic.h
++++ b/src/dbinc/atomic.h
+@@ -144,7 +144,7 @@ typedef LONG volatile *interlocked_val;
+ #define	atomic_inc(env, p)	__atomic_inc(p)
+ #define	atomic_dec(env, p)	__atomic_dec(p)
+ #define	atomic_compare_exchange(env, p, o, n)	\
+-	__atomic_compare_exchange((p), (o), (n))
++	__db_atomic_compare_exchange((p), (o), (n))
+ static inline int __atomic_inc(db_atomic_t *p)
+ {
+ 	int	temp;
+@@ -176,7 +176,7 @@ static inline int __atomic_dec(db_atomic_t *p)
+  * http://gcc.gnu.org/onlinedocs/gcc-4.1.0/gcc/Atomic-Builtins.html
+  * which configure could be changed to use.
+  */
+-static inline int __atomic_compare_exchange(
++static inline int __db_atomic_compare_exchange(
+ 	db_atomic_t *p, atomic_value_t oldval, atomic_value_t newval)
+ {
+ 	atomic_value_t was;
+-- 
+1.8.3.1
+

meta/recipes-support/db/db_5.3.28.bb

@@ -21,6 +21,7 @@ PE = "1"
 SRC_URI = "http://download.oracle.com/berkeley-db/db-${PV}.tar.gz"
 SRC_URI += "file://arm-thumb-mutex_db5.patch \
             file://fix-parallel-build.patch \
+            file://0001-atomic-Rename-local-__atomic_compare_exchange-to-avo.patch \
            "
 
 SRC_URI[md5sum] = "b99454564d5b4479750567031d66fe24"