1 files changed, 66 insertions, 0 deletions
diff --git a/test/SemaTemplate/extern-templates.cpp b/test/SemaTemplate/extern-templates.cpp
new file mode 100644
index 000000000000..28fda1a11e6b
--- /dev/null
+++ b/test/SemaTemplate/extern-templates.cpp
@@ -0,0 +1,66 @@
+// RUN: clang-cc -fsyntax-only -verify %s
+
+template<typename T>
+class X0 {
+public:
+  void f(T t);
+  
+  struct Inner {
+    void g(T t);
+  };
+};
+
+template<typename T>
+void X0<T>::f(T t) {
+  t = 17; // expected-error{{incompatible}}
+}
+
+extern template class X0<int>;
+
+extern template class X0<int*>;
+
+template<typename T>
+void X0<T>::Inner::g(T t) {
+  t = 17; // expected-error{{incompatible}}
+}
+
+void test_intptr(X0<int*> xi, X0<int*>::Inner xii) {
+  xi.f(0);
+  xii.g(0);
+}
+
+// FIXME: we would like the notes to point to the explicit instantiation at the
+// bottom.
+extern template class X0<long*>; // expected-note 2{{instantiation}}
+
+void test_longptr(X0<long*> xl, X0<long*>::Inner xli) {
+  xl.f(0);
+  xli.g(0);
+}
+
+template class X0<long*>;
+
+template<typename T>
+class X1 {
+public:
+  void f(T t) { t += 2; }
+  
+  void g(T t);
+};
+
+template<typename T>
+void X1<T>::g(T t) { 
+  t += 2; 
+}
+
+extern template class X1<void*>;
+
+void g_X1(X1<void*> x1, void *ptr) {
+  x1.g(ptr);
+}
+
+extern template void X1<const void*>::g(const void*);
+
+void g_X1_2(X1<const void *> x1, const void *ptr) {
+  x1.g(ptr);
+}