reproduction recipe for PR8007, expected to fail for now, review welcome

llvm-svn: 112326

clang/test/SemaTemplate/inject-templated-friend.cpp

@@ -0,0 +1,49 @@
+// RUN: %clang %s -S -emit-llvm -o - | grep -e "define linkonce_odr.*_ZN6pr8007lsERNS_11std_ostreamERKNS_8StreamerINS_3FooEEE"
+// XFAIL: *
+
+namespace pr8007 {
+
+struct std_ostream
+{
+  int dummy;
+};
+
+std_ostream cout;
+
+template <typename STRUCT_TYPE>
+struct Streamer
+{
+    friend std_ostream& operator << (std_ostream& o, const Streamer& f)
+        {
+            Streamer s(f);
+            s(o);
+            return o;
+        }
+
+    Streamer(const STRUCT_TYPE& s) : s(s) {}
+
+    const STRUCT_TYPE& s;
+    void operator () (std_ostream&) const;
+};
+
+typedef struct Foo {} Foo;
+
+std_ostream& operator << (std_ostream& o, const Streamer<Foo>& f);
+/*std_ostream& operator << (std_ostream& o, const Streamer<Foo>& f)
+{
+  // Sema should flag this as a redefinition
+}*/
+
+template <>
+void Streamer<Foo>::operator () (std_ostream& o) const
+{
+}
+
+} // namespace pr8007
+
+int main(void)
+{
+    using namespace pr8007;
+    Foo foo;
+    cout << foo;
+}