Fix initialization for members of anonymous struct in a union.

llvm-svn: 111159

clang/lib/Sema/SemaDeclCXX.cpp

@@ -1798,6 +1798,9 @@ static bool CollectFieldInitializer(BaseAndFieldInfo &Info,
           // Once we've initialized a field of an anonymous union, the union
           // field in the class is also initialized, so exit immediately.
           return false;
+        } else if ((*FA)->isAnonymousStructOrUnion()) {
+          if (CollectFieldInitializer(Info, Top, *FA))
+            return true;
         }
       }
 

clang/test/CodeGenCXX/anonymous-union-member-initializer.cpp

@@ -78,3 +78,15 @@ namespace test3 {
   // CHECK-NEXT: [[CVALUE:%.*]] = getelementptr inbounds {{.*}} [[STRUCT]], i32 0, i32 0
   // CHECK-NEXT: store i8* null, void i8** [[CVALUE]]
 }
+
+struct S {
+  // CHECK: store i32 42
+  // CHECK: store i32 55
+  S() : x(42), y(55) {}
+  union {
+    struct {
+      int x;
+      union { int y; };
+    };
+  };
+} s;