diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Threading.h b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Threading.h
index d1944a57bb709cb4207f82dea26eb94001455498..1f6d25ee25b7bd626d3dc407281788aed48e9c2f 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Threading.h
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Threading.h
@@ -71,18 +71,10 @@
 
 #if OS(WINDOWS) && !OS(WINCE)
 #include <windows.h>
-#elif OS(DARWIN)
-#include <libkern/OSAtomic.h>
 #elif OS(ANDROID) && !PLATFORM(QT)
 #include <cutils/atomic.h>
 #elif OS(QNX)
 #include <atomic.h>
-#elif COMPILER(GCC) && !OS(SYMBIAN)
-#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2))
-#include <ext/atomicity.h>
-#else
-#include <bits/atomicity.h>
-#endif
 #endif
 
 #if USE(PTHREADS)
@@ -230,12 +222,6 @@ inline int atomicIncrement(int volatile* addend) { return InterlockedIncrement(r
 inline int atomicDecrement(int volatile* addend) { return InterlockedDecrement(reinterpret_cast<long volatile*>(addend)); }
 #endif
 
-#elif OS(DARWIN)
-#define WTF_USE_LOCKFREE_THREADSAFESHARED 1
-
-inline int atomicIncrement(int volatile* addend) { return OSAtomicIncrement32Barrier(const_cast<int*>(addend)); }
-inline int atomicDecrement(int volatile* addend) { return OSAtomicDecrement32Barrier(const_cast<int*>(addend)); }
-
 #elif OS(ANDROID) && !PLATFORM(QT)
 
 inline int atomicIncrement(int volatile* addend) { return android_atomic_inc(addend); }
@@ -250,8 +236,8 @@ inline int atomicDecrement(int volatile* addend) { return (int) atomic_sub_value
 #elif COMPILER(GCC) && !CPU(SPARC64) && !OS(SYMBIAN) // sizeof(_Atomic_word) != sizeof(int) on sparc64 gcc
 #define WTF_USE_LOCKFREE_THREADSAFESHARED 1
 
-inline int atomicIncrement(int volatile* addend) { return __gnu_cxx::__exchange_and_add(addend, 1) + 1; }
-inline int atomicDecrement(int volatile* addend) { return __gnu_cxx::__exchange_and_add(addend, -1) - 1; }
+inline int atomicIncrement(int volatile* addend) { return __sync_add_and_fetch(addend, 1); }
+inline int atomicDecrement(int volatile* addend) { return __sync_sub_and_fetch(addend, 1); }
 
 #endif