--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/pr57793.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,23 @@
+/* PR c++/57793 */
+
+struct A { unsigned a : 1; unsigned b : 1; };
+struct B     /* { dg-error "type .B. is too large" "" { target { c++ && ilp32 } } } */
+{
+  unsigned char c[0x40000000]; /* { dg-error "size of array .c. is too large" "" { target { ! int32plus } } } */
+  unsigned char d[0x40000ff0];/* { dg-error "size of array .d. is too large" "" { target { ! int32plus } } } */
+  struct A e;
+}; /* { dg-error "type .struct B. is too large" "" { target { c && ilp32 } } } */
+
+void *foo (struct B *p)
+{
+  if (p->e.a)
+    return (void *) 0;
+  p->e.b = 1;
+  return p->c;
+}
+
+void
+bar (struct B *p)
+{
+  foo (p);
+}