1 files changed, 31 insertions, 0 deletions
diff --git a/clang/test/CodeGen/union-init.c b/clang/test/CodeGen/union-init.c
new file mode 100644
index 0000000..60906b5
--- /dev/null
+++ b/clang/test/CodeGen/union-init.c
@@ -0,0 +1,31 @@
+// RUN: %clang_cc1 -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},
+};