--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/pr51628-35.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,23 @@
+/* PR c/51628.  */
+/* { dg-do compile } */
+/* { dg-options "-O" } */
+
+struct B { int i; };
+struct C { struct B b; } __attribute__ ((packed));
+
+extern struct C *p;
+extern struct C *bar (void);
+
+long *
+foo1 (void)
+{
+  return (long *) p;
+/* { dg-warning "may result in an unaligned pointer value" "" { target *-*-* } .-1 } */
+}
+
+long *
+foo2 (void)
+{
+  return (long *) bar ();
+/* { dg-warning "may result in an unaligned pointer value" "" { target *-*-* } .-1 } */
+}