1 files changed, 19 insertions, 0 deletions
diff --git a/test/CodeGenObjC/2009-01-26-WriteBarrier-2.m b/test/CodeGenObjC/2009-01-26-WriteBarrier-2.m
new file mode 100644
index 000000000000..d7219f185ba7
--- /dev/null
+++ b/test/CodeGenObjC/2009-01-26-WriteBarrier-2.m
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -fblocks -emit-llvm %s -fobjc-gc -o - | FileCheck %s
+
+// CHECK: objc_assign_strongCast
+// rdar://5541393
+
+typedef __SIZE_TYPE__ size_t;
+void * malloc(size_t size);
+
+typedef struct {
+    void (^ivarBlock)(void);
+} StructWithBlock_t;
+
+int main(int argc, char *argv[]) {
+   StructWithBlock_t *swbp = (StructWithBlock_t *)malloc(sizeof(StructWithBlock_t*));
+   __block   int i = 10;
+   // assigning a Block into an struct slot should elicit a write-barrier under GC
+   swbp->ivarBlock = ^ { ++i; };
+   return 0;
+}