1 files changed, 16 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/ext/visibility/anon3.C b/gcc/testsuite/g++.dg/ext/visibility/anon3.C
new file mode 100644
index 000000000..9def559d2
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/visibility/anon3.C
@@ -0,0 +1,16 @@
+// PR c++/31187
+// Bug: the repeated declaration was confusing the compiler into
+// thinking that foo1 had language internal linkage.
+
+class foo { };
+
+namespace
+{
+  extern foo foo1;
+  foo foo1;
+}
+
+template< foo * >
+class bar { };
+
+bar< &foo1 > bar1;