--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/ext/flexary10.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,18 @@
+// PR c++/68490 - error initializing a structure with a flexible array member
+// { dg-do compile }
+// { dg-options "-Wpedantic" }
+
+struct A {
+  int n;
+  int a[];  // { dg-warning "forbids flexible array member" }
+};
+
+struct A foo (void)
+{
+  // Verify the initializer below is accepted for compatibility with gcc
+  // (in C mode).
+  static struct A
+    a = { 2, { 1, 0 } };   // { dg-warning "initialization of a flexible array member" }
+
+  return a;
+}