From b86ad3612d6644cfb942e85ea18d5d88989e706e Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Thu, 6 Dec 2012 23:58:32 -0500
Subject: [PATCH] re PR c++/55249 (Multiple copy constructors for template
 class lead to link errors)

	PR c++/55249
	* tree.c (build_vec_init_elt): Use the type of the initializer.

From-SVN: r194285
---
 gcc/cp/ChangeLog                        |  5 +++++
 gcc/cp/tree.c                           |  3 ++-
 gcc/testsuite/g++.dg/template/array25.C | 18 ++++++++++++++++++
 3 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/template/array25.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index a6b69cbe81a4..2a607b896c26 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2012-12-06  Jason Merrill  <jason@redhat.com>
+
+	PR c++/55249
+	* tree.c (build_vec_init_elt): Use the type of the initializer.
+
 2012-11-29  Jason Merrill  <jason@redhat.com>
 
 	PR c++/53862
diff --git a/gcc/cp/tree.c b/gcc/cp/tree.c
index 6a39cc9e448d..4d5407073f5a 100644
--- a/gcc/cp/tree.c
+++ b/gcc/cp/tree.c
@@ -490,7 +490,8 @@ build_vec_init_elt (tree type, tree init)
   argvec = make_tree_vector ();
   if (init)
     {
-      tree dummy = build_dummy_object (inner_type);
+      tree init_type = strip_array_types (TREE_TYPE (init));
+      tree dummy = build_dummy_object (init_type);
       if (!real_lvalue_p (init))
 	dummy = move (dummy);
       VEC_quick_push (tree, argvec, dummy);
diff --git a/gcc/testsuite/g++.dg/template/array25.C b/gcc/testsuite/g++.dg/template/array25.C
new file mode 100644
index 000000000000..4f3ccbf702da
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/array25.C
@@ -0,0 +1,18 @@
+// PR c++/55249
+
+template <typename _Tp> struct A
+{
+  _Tp _M_instance[1];
+};
+template <class> struct inner_type
+{
+    inner_type () {}
+    inner_type (inner_type &);
+    inner_type (const inner_type &) {}
+};
+
+int
+main ()
+{
+    A <inner_type <int> > a, b = a;
+}
-- 
2.47.2