--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/attr-opt-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,37 @@
+/* PR c/70255 */
+/* { dg-do compile } */
+
+double
+fn1 (double h, double l) /* { dg-message "previous definition" } */
+{
+  return h + l;
+}
+double fn1 (double, double) __attribute__ ((optimize ("no-associative-math"))); /* { dg-warning "optimization attribute" } */
+
+__attribute__ ((optimize ("no-associative-math"))) double
+fn2 (double h, double l)
+{
+  return h + l;
+}
+double fn2 (double, double) __attribute__ ((optimize ("no-associative-math")));
+
+__attribute__ ((optimize ("no-associative-math"))) double
+fn3 (double h, double l) /* { dg-message "previous definition" } */
+{
+  return h + l;
+}
+double fn3 (double, double) __attribute__ ((optimize ("O2,no-associative-math"))); /* { dg-warning "optimization attribute" } */
+
+__attribute__ ((optimize ("no-associative-math,O2"))) double
+fn4 (double h, double l) /* { dg-message "previous definition" } */
+{
+  return h + l;
+}
+double fn4 (double, double) __attribute__ ((optimize ("O2,no-associative-math"))); /* { dg-warning "optimization attribute" } */
+
+__attribute__ ((optimize ("no-reciprocal-math"), optimize ("no-associative-math"))) int
+fn5 (void)
+{
+  return 0;
+}
+int __attribute__ ((optimize ("no-associative-math"), optimize ("no-reciprocal-math"))) fn5 (void);