1 files changed, 25 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/memcpy-2.c b/gcc/testsuite/gcc.dg/memcpy-2.c
new file mode 100644
index 000000000..24464abd4
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/memcpy-2.c
@@ -0,0 +1,25 @@
+/* PR middle-end/38454 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+extern inline __attribute__((gnu_inline, always_inline, artificial)) void *
+memcpy (void *__restrict dest, const void *__restrict src, size_t len)
+{
+  return __builtin___memcpy_chk (dest, /* { dg-warning "will always overflow destination buffer" } */
+				 src, len, __builtin_object_size (dest, 0));
+}
+
+struct S { char buf[10]; } s;
+
+void
+foo (void)
+{
+  char buf[12];
+  char *p = buf + 4;
+  struct S *q = (struct S *) p;
+  memcpy (q, &s, sizeof (s));
+}
+
+/* { dg-final { scan-assembler "__memcpy_chk" } } */