roll clang 159409:160967

chrome/common/mac/objc_zombie.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/common/mac/objc_zombie.h"
 
 #include <dlfcn.h>
 #include <execinfo.h>
 #include <mach-o/dyld.h>
 #include <mach-o/nlist.h>
 
 #import <objc/objc-class.h>
 
 #include <algorithm>
 
 #include "base/debug/stack_trace.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/mac/crash_logging.h"
 #include "base/mac/mac_util.h"
 #include "base/metrics/histogram.h"
 #include "base/synchronization/lock.h"
 #import "chrome/common/mac/objc_method_swizzle.h"
 
 // Deallocated objects are re-classed as |CrZombie|.  No superclass
 // because then the class would have to override many/most of the
 // inherited methods (|NSObject| is like a category magnet!).
-@interface CrZombie {
+// Without the __attribute__, clang's -Wobjc-root-class warns on the missing
+// superclass.
+__attribute__((objc_root_class))
+@interface CrZombie  {
   Class isa;
 }
 @end
 
 // Objects with enough space are made into "fat" zombies, which
 // directly remember which class they were until reallocated.
 @interface CrFatZombie : CrZombie {
  @public
   Class wasa;
 }
@@ skipping 505 matching lines @@
   if (oldZombies) {
     for (size_t i = 0; i < oldCount; ++i) {
       if (oldZombies[i].object)
         object_dispose(oldZombies[i].object);
     }
     free(oldZombies);
   }
 }
 
 }  // namespace ObjcEvilDoers