New warning with official XCode 6.0 release, compiling fastdebug (and probably slowdebug as well):

/Users/dr2chase/work/jdk9/hotspot/src/share/vm/memory/allocation.cpp:698:3: error: 'operator new' should not return a null pointer unless it is declared 'throw()' [-Werror,-Wnew-returns-null]
  return 0;
  ^

Proposed fix: 

static void * zero = (void *) 0;

void* operator new(size_t size) /* throw(std::bad_alloc) */ {
  fatal("Should not call global operator new");
  return zero;
}

void* operator new [](size_t size) /* throw(std::bad_alloc) */ {
  fatal("Should not call global operator new[]");
  return zero;
}