From ec529e2584bc299e48bf2e8b354f7fd9b6a900a8 Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Tue, 25 Nov 2014 09:34:43 -0500
Subject: [PATCH] * pt.c (lookup_template_variable): Always unknown_type_node.

From-SVN: r218045
---
 gcc/cp/ChangeLog                         |  4 ++++
 gcc/cp/pt.c                              | 13 ++++---------
 gcc/testsuite/g++.dg/cpp1y/var-templ17.C |  9 +++++++++
 3 files changed, 17 insertions(+), 9 deletions(-)
 create mode 100644 gcc/testsuite/g++.dg/cpp1y/var-templ17.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index f1ef2e0b3f1..ae43baad92d 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,7 @@
+2014-11-24  Jason Merrill  <jason@redhat.com>
+
+	* pt.c (lookup_template_variable): Always unknown_type_node.
+
 2014-11-25  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/63786
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 1d6b916c003..29fb2e1117e 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -8026,19 +8026,14 @@ lookup_template_class (tree d1, tree arglist, tree in_decl, tree context,
   return ret;
 }
 
-/* Return a TEMPLATE_ID_EXPR for the given variable template and ARGLIST. 
-   If the ARGLIST refers to any template parameters, the type of the
-   expression is the unknown_type_node since the template-id could
-   refer to an explicit or partial specialization. */
+/* Return a TEMPLATE_ID_EXPR for the given variable template and ARGLIST.
+   The type of the expression is the unknown_type_node since the
+   template-id could refer to an explicit or partial specialization. */
 
 tree
 lookup_template_variable (tree templ, tree arglist)
 {
-  tree type;
-  if (uses_template_parms (arglist))
-    type = unknown_type_node;
-  else
-    type = TREE_TYPE (templ);
+  tree type = unknown_type_node;
   tsubst_flags_t complain = tf_warning_or_error;
   tree parms = INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (templ));
   arglist = coerce_template_parms (parms, arglist, templ, complain,
diff --git a/gcc/testsuite/g++.dg/cpp1y/var-templ17.C b/gcc/testsuite/g++.dg/cpp1y/var-templ17.C
new file mode 100644
index 00000000000..c6d97ebb368
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/var-templ17.C
@@ -0,0 +1,9 @@
+// DR 1727: a specialization doesn't need to have the same type
+// { dg-do compile { target c++14 } }
+
+template <class T> T t = 42;
+template<> void* t<int> = 0;
+
+template<class T, class U> struct same;
+template<class T> struct same<T,T> {};
+same<void*,decltype(t<int>)> s;
-- 
2.30.2