Sema: Subst type default template args earlier

Summary:
We would not perform substitution at an appropriate point, allowing strange
results to appear. We would accepts things that we shouldn't or mangle things incorrectly.  Note that this hasn't fixed the other cases like
template-template parameters or non-type template parameters.

Reviewers: doug.gregor, rjmccall, rsmith

Reviewed By: rsmith

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1507

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189540 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 23 insertions, 0 deletions

diff --git a/test/CodeGenCXX/mangle.cpp b/test/CodeGenCXX/mangle.cpp
index a9daa0df61..f03f499fe1 100644
--- a/test/CodeGenCXX/mangle.cpp
+++ b/test/CodeGenCXX/mangle.cpp
@@ -910,3 +910,26 @@ namespace test40 {
   };
   void g() { f(); }
 }
+
+namespace test41 {
+  // CHECK: define linkonce_odr void @_ZN6test414funcINS_1XEEEvNS_3fooILi20ES1_EE
+  template <int i, class T> struct foo {
+    template <class T2 = T> friend void func(foo x) {}
+  };
+
+  struct X {};
+
+  void g() { func(foo<20, X>()); }
+}
+
+namespace test42 {
+  // CHECK: define linkonce_odr void @_ZN6test424funcINS_1XEEEvNS_3fooILi20ES1_EE
+  template <int i, template <class> class T> struct foo {
+    template <template <class> class T2 = T> friend void func(foo x) {}
+  };
+
+  template <class V> struct X {
+  };
+
+  void g() { func(foo<20, X>()); }
+}