--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/unroll-5.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,29 @@
+/* { dg-do compile } */
+
+extern void bar (int);
+
+int j;
+
+void test (void)
+{
+  #pragma GCC unroll 4+4
+  for (unsigned long i = 1; i <= 8; ++i)
+    bar(i);
+
+  #pragma GCC unroll -1	/* { dg-error "requires an assignment-expression that evaluates to a non-negative integral constant less than" } */
+  for (unsigned long i = 1; i <= 8; ++i)
+    bar(i);
+
+  #pragma GCC unroll 20000000000	/* { dg-error "requires an assignment-expression that evaluates to a non-negative integral constant less than" } */
+  for (unsigned long i = 1; i <= 8; ++i)
+    bar(i);
+
+  #pragma GCC unroll j	/* { dg-error "requires an assignment-expression that evaluates to a non-negative integral constant less than" } */
+                        /* { dg-error "cannot appear in a constant-expression|is not usable in a constant expression" "" { target c++ } .-1 } */
+  for (unsigned long i = 1; i <= 8; ++i)
+    bar(i);
+
+  #pragma GCC unroll  4.2	/* { dg-error "requires an assignment-expression that evaluates to a non-negative integral constant less than" } */
+  for (unsigned long i = 1; i <= 8; ++i)
+    bar(i);
+}