--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/CodeGenCXX/dllexport-ms-friend.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 -triple %ms_abi_triple -fms-extensions -emit-llvm -O0 -o - %s | FileCheck %s
+
+// Friend functions defined in classes are emitted.
+// CHECK: define weak_odr dso_local dllexport void @"?friend1@@YAXXZ"()
+struct FuncFriend1 {
+  friend __declspec(dllexport) void friend1() {}
+};
+
+// But function templates and functions defined in class templates are not
+// emitted.
+// CHECK-NOT: friend2
+// CHECK-NOT: friend3
+// CHECK-NOT: friend4
+struct FuncFriend2 {
+  template<typename> friend __declspec(dllexport) void friend2() {}
+};
+template<typename> struct FuncFriend3 {
+  friend __declspec(dllexport) void friend3() {}
+  struct Inner {
+    friend __declspec(dllexport) void friend4() {}
+  };
+};