--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/Wcxx-compat-6.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,112 @@
+/* { dg-do compile } */
+/* { dg-options "-Wc++-compat" } */
+enum E1 { A, B, C };
+enum E2 { D, E, F };
+
+enum E1 v1a = A;
+enum E1 v1b = D;		/* { dg-warning "invalid in C\[+\]\[+\]" } */
+enum E1 v1c = 0;		/* { dg-warning "invalid in C\[+\]\[+\]" } */
+enum E1 v1d = (enum E1) 0;
+enum E1 v1e = (enum E2) 0;	/* { dg-warning "invalid in C\[+\]\[+\]" } */
+
+enum E2 v2a;
+
+enum E1 a1[] =
+{
+  A,
+  D,				/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  0,				/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  (enum E1) 0,
+  (enum E2) 0,			/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  A
+};
+
+struct s1
+{
+  enum E1 e1;
+};
+
+struct s1 a2[] =
+{
+  { A },
+  { D },			/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  { 0 },			/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  { (enum E1) 0 },
+  { (enum E2) 0 },		/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  { A }
+};
+
+struct s1 a3[] =
+{
+  [ 5 ] = { .e1 = A },
+  [ 4 ] = { .e1 = D },		/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  [ 3 ] = { .e1 = 0 },		/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  [ 2 ] = { .e1 = (enum E1) 0 },
+  [ 1 ] = { .e1 = (enum E2) 0 }, /* { dg-warning "invalid in C\[+\]\[+\]" } */
+  [ 0 ] = { .e1 = A }
+};
+
+struct s2
+{
+  enum E1 e1 : 3;
+};
+
+struct s2 a4[] =
+{
+  { A },
+  { D },			/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  { 0 },			/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  { (enum E1) 0 },
+  { (enum E2) 0 },		/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  { A }
+};
+
+struct s2 a5[] =
+{
+  [ 5 ] = { .e1 = A },
+  [ 4 ] = { .e1 = D },		/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  [ 3 ] = { .e1 = 0 },		/* { dg-warning "invalid in C\[+\]\[+\]" } */
+  [ 2 ] = { .e1 = (enum E1) 0 },
+  [ 1 ] = { .e1 = (enum E2) 0 }, /* { dg-warning "invalid in C\[+\]\[+\]" } */
+  [ 0 ] = { .e1 = A }
+};
+
+void
+f(enum E1 e1, enum E2 e2, struct s1 vs1, struct s1 *vp1)
+{
+  enum E1 va1[] = {
+    e1,
+    e2,				/* { dg-warning "invalid in C\[+\]\[+\]" } */
+    v1a,
+    v2a,			/* { dg-warning "invalid in C\[+\]\[+\]" } */
+    vs1.e1,
+    vp1->e1,
+    e1 ? e1 : e1,
+    (0, e1)
+  };
+
+  struct s1 va2[] = {
+    { e1 },
+    { e2 },			/* { dg-warning "invalid in C\[+\]\[+\]" } */
+    { v1a },
+    { v2a },			/* { dg-warning "invalid in C\[+\]\[+\]" } */
+    { vs1.e1 },
+    { vp1->e1 },
+    { e1 ? e1 : e1 },
+    { (0, e1) }
+  };
+
+  struct s2 va3[] = {
+    { e1 },
+    { e2 },			/* { dg-warning "invalid in C\[+\]\[+\]" } */
+    { v1a },
+    { v2a },			/* { dg-warning "invalid in C\[+\]\[+\]" } */
+    { vs1.e1 },
+    { vp1->e1 },
+    { e1 ? e1 : e1 },
+    { (0, e1) }
+  };
+}
+
+/* Match all extra informative notes.  */
+/* { dg-message "near initialization for" "expected" { target *-*-* } 0 } */