1 files changed, 28 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/nrv1.c b/gcc-4.9/gcc/testsuite/gcc.dg/nrv1.c
new file mode 100644
index 000000000..ca700924a
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.dg/nrv1.c
@@ -0,0 +1,28 @@
+/* Test that the NRV optimization doesn't cause a1 to change too soon.  This
+   is equivalent to c++/19317.  */
+/* { dg-do run } */
+
+void abort (void);
+
+struct A
+{
+  int i[100];
+};
+
+struct A a1;
+
+struct A f ()
+{
+  struct A a2;
+  a2.i[0] = 42;
+  /* a1.i[0] should still be 0 until we return. */
+  if (a1.i[0] != 0)
+    abort ();
+  return a2;
+}
+
+int main()
+{
+  a1 = f();
+  return 0;
+}