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      1 // RUN: %clang_cc1 -fobjc-nonfragile-abi -triple x86_64-apple-darwin10 -emit-llvm -o - %s | FileCheck -check-prefix=CHECK-X86-64 %s
      2 
      3 __attribute__((weak_import)) @interface WeakRootClass @end
      4 
      5 __attribute__((weak_import)) @interface WeakClass : WeakRootClass
      6 @end
      7 
      8 @interface MySubclass : WeakClass @end
      9 
     10 @implementation MySubclass @end
     11 
     12 @implementation WeakClass(MyCategory) @end
     13 
     14 
     15 __attribute__((weak_import))
     16 @interface WeakClass1 @end
     17 
     18 @implementation WeakClass1(MyCategory) @end
     19 
     20 @implementation WeakClass1(YourCategory) @end
     21 
     22  __attribute__((weak_import))
     23 @interface WeakClass3 
     24 + message;
     25 @end
     26 
     27 int main() {
     28      [WeakClass3 message];
     29 }
     30 
     31 // CHECK-X86-64: OBJC_METACLASS_$_WeakRootClass" = extern_weak global
     32 // CHECK-X86-64: OBJC_METACLASS_$_WeakClass" = extern_weak global
     33 // CHECK-X86-64: OBJC_CLASS_$_WeakClass" = extern_weak global
     34 // CHECK-X86-64: OBJC_CLASS_$_WeakClass1" = extern_weak global
     35 // CHECK-X86-64: OBJC_CLASS_$_WeakClass3" = extern_weak global
     36 
     37 // Root is being implemented here. No extern_weak.
     38 __attribute__((weak_import)) @interface Root @end
     39 
     40 @interface Super : Root @end
     41 
     42 @interface Sub : Super @end
     43 
     44 @implementation Sub @end
     45 
     46 @implementation Root @end
     47 
     48 // CHECK-NOT-X86-64: OBJC_METACLASS_$_Root" = extern_weak global
     49