--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/attributes-3.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,27 @@
+/* PR c++/71024 */
+/* { dg-do compile } */
+/* { dg-prune-output "declared but never defined" } */
+
+void
+fn0 (void) /* { dg-message "previous definition" } */
+{
+}
+extern void __attribute__((optimize ("O2"))) fn0 (void); /* { dg-warning "optimization attribute" } */
+
+extern __attribute__((noinline)) int fn1 (void); /* { dg-message "previous declaration" } */
+extern inline int fn1 (void); /* { dg-warning "inline declaration of" } */
+
+extern inline int fn2 (void); /* { dg-message "previous declaration" } */
+extern __attribute__((noinline)) int fn2 (void); /* { dg-warning "attribute noinline follows inline declaration" } */
+
+extern __attribute__((always_inline)) int fn3 (void); /* { dg-message "previous declaration" } */
+extern __attribute__((noinline)) int fn3 (void); /* { dg-warning "attribute .noinline. follows declaration with attribute .always_inline." } */
+
+extern __attribute__((noinline)) int fn4 (void); /* { dg-message "previous declaration" } */
+extern __attribute__((always_inline)) int fn4 (void); /* { dg-warning "attribute .always_inline. follows declaration with attribute .noinline." } */
+
+extern __attribute__((hot)) int fn5 (void); /* { dg-message "previous declaration" } */
+extern __attribute__((cold)) int fn5 (void); /* { dg-warning "attribute .cold. follows declaration with attribute .hot." } */
+
+extern __attribute__((cold)) int fn6 (void); /* { dg-message "previous declaration" } */
+extern __attribute__((hot)) int fn6 (void); /* { dg-warning "attribute .hot. follows declaration with attribute .cold." } */