--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/Wstrict-overflow-27.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,28 @@
+/* { dg-do compile } */
+/* { dg-options "-O3 -Wstrict-overflow=2 -Werror" } */
+
+typedef __SIZE_TYPE__ size_t;
+extern char *strtok_r (char *__restrict __s, const char *__restrict __delim,
+		       char **__restrict __save_ptr)
+  __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (2, 3)));
+extern const unsigned short int **__ctype_b_loc (void)
+  __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__const__));
+extern int *DEBUGLEVEL_CLASS;
+size_t debug_num_classes = 0;
+void debug_parse_param(char *param);
+void
+debug_parse_levels(const char *params_str, size_t str_len)
+{
+  char str[str_len+1];
+  char *tok, *saveptr;
+  size_t i;
+  tok = strtok_r(str, " \t,\n\r", &saveptr);
+  if (((*__ctype_b_loc ())[(int) ((tok[0]))]))
+    tok = strtok_r(((void *)0), " \t,\n\r", &saveptr);
+  else
+    DEBUGLEVEL_CLASS[0] = 0;
+  for (i = 0 +1; i < debug_num_classes; i++)
+    DEBUGLEVEL_CLASS[i] = DEBUGLEVEL_CLASS[0];
+  while (tok != ((void *)0) )
+    debug_parse_param(tok);
+}