1 files changed, 31 insertions, 0 deletions
diff --git a/test/CodeGen/union-init.c b/test/CodeGen/union-init.c
new file mode 100644
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--- /dev/null
+++ b/test/CodeGen/union-init.c
@@ -0,0 +1,31 @@
+// RUN: clang-cc -emit-llvm < %s -o -
+
+// A nice and complicated initialization example with unions from Python
+typedef int Py_ssize_t;
+
+typedef union _gc_head {
+	struct {
+		union _gc_head *gc_next;
+		union _gc_head *gc_prev;
+		Py_ssize_t gc_refs;
+	} gc;
+	long double dummy;  /* force worst-case alignment */
+} PyGC_Head;
+
+struct gc_generation {
+	PyGC_Head head;
+	int threshold; /* collection threshold */
+	int count; /* count of allocations or collections of younger
+		      generations */
+};
+
+#define NUM_GENERATIONS 3
+#define GEN_HEAD(n) (&generations[n].head)
+
+/* linked lists of container objects */
+struct gc_generation generations[NUM_GENERATIONS] = {
+	/* PyGC_Head,				threshold,	count */
+	{{{GEN_HEAD(0), GEN_HEAD(0), 0}},	700,		0},
+	{{{GEN_HEAD(1), GEN_HEAD(1), 0}},	10,		0},
+	{{{GEN_HEAD(2), GEN_HEAD(2), 0}},	10,		0},
+};