--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/Wstringop-overflow-10.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,34 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wstringop-overflow" } */
+
+void
+foo (char *a)
+{
+  char b[16] = "abcdefg";
+  __builtin_strncpy (a, b, __builtin_strlen (b));	/* { dg-warning "specified bound depends on the length of the source argument" } */
+}
+
+void
+bar (char *a)
+{
+  char b[16] = "abcdefg";
+  __builtin_strncpy (a, b, __builtin_strnlen (b, 8));	/* { dg-warning "specified bound depends on the length of the source argument" } */
+}
+
+void
+baz (char *a)
+{
+  char b[16] = "abcdefg";
+  __builtin_strncpy (a, b, __builtin_strnlen (b, 7));	/* { dg-bogus "specified bound depends on the length of the source argument" } */
+}
+
+void fill (char *);
+
+void
+qux (char *a)
+{
+  char b[16];
+  fill (b);
+  __builtin_memcpy (b, "abcdefg", 7);
+  __builtin_strncpy (a, b, __builtin_strnlen (b, 8));	/* { dg-bogus "specified bound depends on the length of the source argument" } */
+}