Add forgotten test case for linkage specifications

llvm-svn: 61737
diff --git a/clang/test/SemaCXX/linkage-spec.cpp b/clang/test/SemaCXX/linkage-spec.cpp
new file mode 100644
index 0000000..80d95fb
--- /dev/null
+++ b/clang/test/SemaCXX/linkage-spec.cpp
@@ -0,0 +1,17 @@
+// RUN: clang -fsyntax-only -verify %s
+extern "C" {
+  extern "C" void f(int);
+}
+
+extern "C++" {
+  extern "C++" int& g(int);
+  float& g();
+}
+double& g(double);
+
+void test(int x, double d) {
+  f(x);
+  float &f1 = g();
+  int& i1 = g(x);
+  double& d1 = g(d);
+}