objc: fixes a problem in block type comparison involving
enums with underlying type explicitly specified
(feature which is on by default in objective-c). 
// rdar://10798770


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149888 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index 51cbc3c..416045e 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -5960,11 +5960,13 @@
     // Compatibility is based on the underlying type, not the promotion
     // type.
     if (const EnumType* ETy = LHS->getAs<EnumType>()) {
-      if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType())
+      QualType TINT = ETy->getDecl()->getIntegerType();
+      if (!TINT.isNull() && hasSameType(TINT, RHSCan.getUnqualifiedType()))
         return RHS;
     }
     if (const EnumType* ETy = RHS->getAs<EnumType>()) {
-      if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType())
+      QualType TINT = ETy->getDecl()->getIntegerType();
+      if (!TINT.isNull() && hasSameType(TINT, LHSCan.getUnqualifiedType()))
         return LHS;
     }
     // allow block pointer type to match an 'id' type.
diff --git a/test/SemaObjC/block-type-safety.m b/test/SemaObjC/block-type-safety.m
index ebc6777..bfb848e 100644
--- a/test/SemaObjC/block-type-safety.m
+++ b/test/SemaObjC/block-type-safety.m
@@ -138,3 +138,20 @@
     return 0;
 }
 
+// rdar://10798770
+typedef int NSInteger;
+
+typedef enum : NSInteger {NSOrderedAscending = -1L, NSOrderedSame, NSOrderedDescending} NSComparisonResult;
+
+typedef NSComparisonResult (^NSComparator)(id obj1, id obj2);
+
+@interface radar10798770
+- (void)sortUsingComparator:(NSComparator)c;
+@end
+
+void f() {
+   radar10798770 *f;
+   [f sortUsingComparator:^(id a, id b) {
+        return NSOrderedSame;
+   }];
+}