1 files changed, 28 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/memset-1.c b/gcc/testsuite/gcc.dg/memset-1.c
new file mode 100644
index 000000000..677ae91bd
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/memset-1.c
@@ -0,0 +1,28 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+extern void warn_memset_zero_len (void)
+__attribute__((__warning__ ("memset used with constant zero length parameter;"
+			    " this could be due to transposed parameters")));
+
+extern inline __attribute__((gnu_inline, always_inline, artificial)) void *
+memset (void *dest, int ch, size_t len)
+{
+  if (__builtin_constant_p (len) && len == 0)
+    {
+      warn_memset_zero_len ();	/* { dg-warning "memset used with constant zero" } */
+      return dest;
+    }
+  return __builtin_memset (dest, ch, len);
+}
+
+char buf[10];
+
+int
+main (void)
+{
+  memset (buf, sizeof (buf), 0);
+  return 0;
+}