1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/ext/visibility/warn4.C b/gcc/testsuite/g++.dg/ext/visibility/warn4.C
new file mode 100644
index 000000000..33e6f6785
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/visibility/warn4.C
@@ -0,0 +1,10 @@
+// Warn if we try to give an instantiation visibility after it's already
+// been instantiated.
+
+// { dg-require-visibility "" }
+
+template <class T> struct A { void f (T); };
+template <class T> void A<T>::f (T) { }
+
+A<double> ad;
+template struct __attribute ((visibility ("hidden"))) A<double>; // { dg-warning "already defined" }