writable property in a category of class's superclass

makes the property writable in the current class.
 


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68446 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 20 insertions, 0 deletions

diff --git a/lib/Sema/SemaDeclObjC.cpp b/lib/Sema/SemaDeclObjC.cpp
index 299f101bdb..80d46bcabb 100644
--- a/lib/Sema/SemaDeclObjC.cpp
+++ b/lib/Sema/SemaDeclObjC.cpp
@@ -835,6 +835,9 @@ bool Sema::isPropertyReadonly(ObjCPropertyDecl *PDecl,
         ObjCImplementations[IDecl->getIdentifier()])
     if (ImpDecl->getInstanceMethod(PDecl->getSetterName()))
       return false;
+  // If all fails, look at the super class.
+  if (ObjCInterfaceDecl *SIDecl = IDecl->getSuperClass())
+    return isPropertyReadonly(PDecl, SIDecl);
   return true;
 }
 
diff --git a/test/SemaObjC/writable-property-in-superclass.m b/test/SemaObjC/writable-property-in-superclass.m
new file mode 100644
index 0000000000..182b1c47bb
--- /dev/null
+++ b/test/SemaObjC/writable-property-in-superclass.m
@@ -0,0 +1,17 @@
+// RUN: clang-cc  -fsyntax-only -verify %s
+
+@interface MessageStore
+@property (assign, readonly) int P;
+@end
+
+@interface MessageStore (CAT)
+@property (assign) int P;
+@end
+
+@interface  NeXTMbox : MessageStore
+@end
+
+@implementation NeXTMbox
+- (void) Meth { self.P = 1; }
+@end
+