From 4417498c9f31829c1c2e0b0a99db13420e988746 Mon Sep 17 00:00:00 2001
From: Fariborz Jahanian <fjahanian@apple.com>
Date: Fri, 15 Nov 2013 17:48:00 +0000
Subject: [PATCH] ObjectiveC. Fixes a bogus warning of unused backing ivar when
 property belongs to a super class and currnt class happens to have a method
 with same name as property. // rdar//15473432

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194830 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Sema/SemaDeclObjC.cpp                   | 11 ++++++++-
 test/SemaObjC/unsued-backing-ivar-warning.m | 25 +++++++++++++++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/lib/Sema/SemaDeclObjC.cpp b/lib/Sema/SemaDeclObjC.cpp
index 86979a1fe8..f44fb32511 100644
--- a/lib/Sema/SemaDeclObjC.cpp
+++ b/lib/Sema/SemaDeclObjC.cpp
@@ -3510,8 +3510,17 @@ Sema::GetIvarBackingPropertyAccessor(const ObjCMethodDecl *Method,
   Method = IDecl->lookupMethod(Method->getSelector(), true);
   if (!Method || !Method->isPropertyAccessor())
     return 0;
-  if ((PDecl = Method->findPropertyDecl()))
+  if ((PDecl = Method->findPropertyDecl())) {
+    if (!PDecl->getDeclContext())
+      return 0;
+    // Make sure property belongs to accessor's class and not to
+    // one of its super classes.
+    if (const ObjCInterfaceDecl *CID =
+        dyn_cast<ObjCInterfaceDecl>(PDecl->getDeclContext()))
+      if (CID != IDecl)
+        return 0;
     return PDecl->getPropertyIvarDecl();
+  }
   return 0;
 }
 
diff --git a/test/SemaObjC/unsued-backing-ivar-warning.m b/test/SemaObjC/unsued-backing-ivar-warning.m
index 2f55efabcd..c07dea71a7 100644
--- a/test/SemaObjC/unsued-backing-ivar-warning.m
+++ b/test/SemaObjC/unsued-backing-ivar-warning.m
@@ -49,3 +49,28 @@
     okIvar = newT;
 }
 @end
+
+// rdar://15473432
+typedef char BOOL;
+@interface CalDAVServerVersion {
+  BOOL _supportsTimeRangeFilterWithoutEndDate;
+}
+@property (nonatomic, readonly,nonatomic) BOOL supportsTimeRangeFilterWithoutEndDate;
+@end
+
+@interface CalDAVConcreteServerVersion : CalDAVServerVersion {
+}
+@end
+
+@interface CalendarServerVersion : CalDAVConcreteServerVersion
+@end
+
+@implementation CalDAVServerVersion
+@synthesize supportsTimeRangeFilterWithoutEndDate=_supportsTimeRangeFilterWithoutEndDate;
+@end
+
+@implementation CalendarServerVersion
+-(BOOL)supportsTimeRangeFilterWithoutEndDate {
+  return 0;
+}
+@end
-- 
2.40.0