Index: include/__config
===================================================================
--- include/__config
+++ include/__config
@@ -126,6 +126,13 @@
 # define _LIBCPP_ABI_ITANIUM
 #endif
 
+#if defined(__APPLE__)
+# include <Availability.h>
+# if __MAC_OS_X_VERSION_MIN_REQUIRED < 1060
+#  define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
+# endif
+#endif // defined(__APPLE__)
+
 // Need to detect which libc we're using if we're on Linux.
 #if defined(__linux__)
 #include <features.h>
Index: include/new
===================================================================
--- include/new
+++ include/new
@@ -101,8 +101,9 @@
 # define _LIBCPP_HAS_NO_SIZED_DEALLOCATION
 #endif
 
-#if !(defined(_LIBCPP_BUILDING_NEW) || _LIBCPP_STD_VER > 14 || \
-    (defined(__cpp_aligned_new) && __cpp_aligned_new >= 201606))
+#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) && \
+    (!(defined(_LIBCPP_BUILDING_NEW) || _LIBCPP_STD_VER > 14 || \
+    (defined(__cpp_aligned_new) && __cpp_aligned_new >= 201606)))
 # define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
 #endif
 
Index: src/new.cpp
===================================================================
--- src/new.cpp
+++ src/new.cpp
@@ -64,38 +64,6 @@
 }
 
 _LIBCPP_WEAK
-void *
-operator new(std::size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC
-{
-    if (size == 0)
-        size = 1;
-    if (static_cast<size_t>(alignment) < sizeof(void*))
-      alignment = std::align_val_t(sizeof(void*));
-    void* p;
-#if defined(_LIBCPP_MSVCRT)
-    while ((p = _aligned_malloc(size, static_cast<size_t>(alignment))) == nullptr)
-#else
-    while (::posix_memalign(&p, static_cast<size_t>(alignment), size) != 0)
-#endif
-    {
-        // If posix_memalign fails and there is a new_handler,
-        // call it to try free up memory.
-        std::new_handler nh = std::get_new_handler();
-        if (nh)
-            nh();
-        else {
-#ifndef _LIBCPP_NO_EXCEPTIONS
-            throw std::bad_alloc();
-#else
-            p = nullptr; // posix_memalign doesn't initialize 'p' on failure
-            break;
-#endif
-        }
-    }
-    return p;
-}
-
-_LIBCPP_WEAK
 void*
 operator new(size_t size, const std::nothrow_t&) _NOEXCEPT
 {
@@ -116,14 +84,21 @@
 
 _LIBCPP_WEAK
 void*
-operator new(size_t size, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT
+operator new[](size_t size) _THROW_BAD_ALLOC
+{
+    return ::operator new(size);
+}
+
+_LIBCPP_WEAK
+void*
+operator new[](size_t size, const std::nothrow_t&) _NOEXCEPT
 {
     void* p = 0;
 #ifndef _LIBCPP_NO_EXCEPTIONS
     try
     {
 #endif  // _LIBCPP_NO_EXCEPTIONS
-        p = ::operator new(size, alignment);
+        p = ::operator new[](size);
 #ifndef _LIBCPP_NO_EXCEPTIONS
     }
     catch (...)
@@ -134,29 +109,92 @@
 }
 
 _LIBCPP_WEAK
-void*
-operator new[](size_t size) _THROW_BAD_ALLOC
+void
+operator delete(void* ptr) _NOEXCEPT
 {
-    return ::operator new(size);
+    if (ptr)
+        ::free(ptr);
 }
 
 _LIBCPP_WEAK
-void*
-operator new[](size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC
+void
+operator delete(void* ptr, const std::nothrow_t&) _NOEXCEPT
 {
-    return ::operator new(size, alignment);
+    ::operator delete(ptr);
+}
+
+_LIBCPP_WEAK
+void
+operator delete(void* ptr, size_t) _NOEXCEPT
+{
+    ::operator delete(ptr);
+}
+
+_LIBCPP_WEAK
+void
+operator delete[] (void* ptr) _NOEXCEPT
+{
+    ::operator delete(ptr);
+}
+
+_LIBCPP_WEAK
+void
+operator delete[] (void* ptr, const std::nothrow_t&) _NOEXCEPT
+{
+    ::operator delete[](ptr);
+}
+
+_LIBCPP_WEAK
+void
+operator delete[] (void* ptr, size_t) _NOEXCEPT
+{
+    ::operator delete[](ptr);
+}
+
+#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION)
+
+_LIBCPP_WEAK
+void *
+operator new(std::size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC
+{
+    if (size == 0)
+        size = 1;
+    if (static_cast<size_t>(alignment) < sizeof(void*))
+      alignment = std::align_val_t(sizeof(void*));
+    void* p;
+#if defined(_LIBCPP_MSVCRT)
+    while ((p = _aligned_malloc(size, static_cast<size_t>(alignment))) == nullptr)
+#else
+    while (::posix_memalign(&p, static_cast<size_t>(alignment), size) != 0)
+#endif
+    {
+        // If posix_memalign fails and there is a new_handler,
+        // call it to try free up memory.
+        std::new_handler nh = std::get_new_handler();
+        if (nh)
+            nh();
+        else {
+#ifndef _LIBCPP_NO_EXCEPTIONS
+            throw std::bad_alloc();
+#else
+            p = nullptr; // posix_memalign doesn't initialize 'p' on failure
+            break;
+#endif
+        }
+    }
+    return p;
 }
 
 _LIBCPP_WEAK
 void*
-operator new[](size_t size, const std::nothrow_t&) _NOEXCEPT
+operator new(size_t size, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT
 {
     void* p = 0;
 #ifndef _LIBCPP_NO_EXCEPTIONS
     try
     {
 #endif  // _LIBCPP_NO_EXCEPTIONS
-        p = ::operator new[](size);
+        p = ::operator new(size, alignment);
 #ifndef _LIBCPP_NO_EXCEPTIONS
     }
     catch (...)
@@ -168,6 +206,13 @@
 
 _LIBCPP_WEAK
 void*
+operator new[](size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC
+{
+    return ::operator new(size, alignment);
+}
+
+_LIBCPP_WEAK
+void*
 operator new[](size_t size, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT
 {
     void* p = 0;
@@ -187,14 +232,6 @@
 
 _LIBCPP_WEAK
 void
-operator delete(void* ptr) _NOEXCEPT
-{
-    if (ptr)
-        ::free(ptr);
-}
-
-_LIBCPP_WEAK
-void
 operator delete(void* ptr, std::align_val_t) _NOEXCEPT
 {
     if (ptr)
@@ -207,13 +244,6 @@
 
 _LIBCPP_WEAK
 void
-operator delete(void* ptr, const std::nothrow_t&) _NOEXCEPT
-{
-    ::operator delete(ptr);
-}
-
-_LIBCPP_WEAK
-void
 operator delete(void* ptr, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT
 {
     ::operator delete(ptr, alignment);
@@ -221,13 +251,6 @@
 
 _LIBCPP_WEAK
 void
-operator delete(void* ptr, size_t) _NOEXCEPT
-{
-    ::operator delete(ptr);
-}
-
-_LIBCPP_WEAK
-void
 operator delete(void* ptr, size_t, std::align_val_t alignment) _NOEXCEPT
 {
     ::operator delete(ptr, alignment);
@@ -235,13 +258,6 @@
 
 _LIBCPP_WEAK
 void
-operator delete[] (void* ptr) _NOEXCEPT
-{
-    ::operator delete(ptr);
-}
-
-_LIBCPP_WEAK
-void
 operator delete[] (void* ptr, std::align_val_t alignment) _NOEXCEPT
 {
     ::operator delete(ptr, alignment);
@@ -249,13 +265,6 @@
 
 _LIBCPP_WEAK
 void
-operator delete[] (void* ptr, const std::nothrow_t&) _NOEXCEPT
-{
-    ::operator delete[](ptr);
-}
-
-_LIBCPP_WEAK
-void
 operator delete[] (void* ptr, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT
 {
     ::operator delete[](ptr, alignment);
@@ -263,18 +272,13 @@
 
 _LIBCPP_WEAK
 void
-operator delete[] (void* ptr, size_t) _NOEXCEPT
-{
-    ::operator delete[](ptr);
-}
-
-_LIBCPP_WEAK
-void
 operator delete[] (void* ptr, size_t, std::align_val_t alignment) _NOEXCEPT
 {
     ::operator delete[](ptr, alignment);
 }
 
+#endif // !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION)
+
 #endif // !__GLIBCXX__
 
 namespace std