From e3dc80be5eea6667a4dd7b2f2a52108d9c4ea06a Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Wed, 18 Jun 2014 18:13:40 -0400
Subject: [PATCH] re PR c++/61507 (GCC does not compile function with parameter
 pack.)

	PR c++/61507
	* pt.c (resolve_overloaded_unification): Preserve
	ARGUMENT_PACK_EXPLICIT_ARGS.

From-SVN: r211808
---
 gcc/cp/ChangeLog                         |  6 ++++++
 gcc/cp/pt.c                              | 11 ++++++++++-
 gcc/testsuite/g++.dg/cpp0x/variadic159.C | 14 ++++++++++++++
 3 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/cpp0x/variadic159.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 9b4818ed971f..74eefeaec1d1 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2014-06-18  Jason Merrill  <jason@redhat.com>
+
+	PR c++/61507
+	* pt.c (resolve_overloaded_unification): Preserve
+	ARGUMENT_PACK_EXPLICIT_ARGS.
+
 2014-06-18  Jakub Jelinek  <jakub@redhat.com>
 
 	* cp-gimplify.c (cxx_omp_finish_clause): Add a gimple_seq *
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index d5cc2576f9de..f0a598beff8d 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -16838,7 +16838,16 @@ resolve_overloaded_unification (tree tparms,
       int i = TREE_VEC_LENGTH (targs);
       for (; i--; )
 	if (TREE_VEC_ELT (tempargs, i))
-	  TREE_VEC_ELT (targs, i) = TREE_VEC_ELT (tempargs, i);
+	  {
+	    tree old = TREE_VEC_ELT (targs, i);
+	    tree new_ = TREE_VEC_ELT (tempargs, i);
+	    if (new_ && old && ARGUMENT_PACK_P (old)
+		&& ARGUMENT_PACK_EXPLICIT_ARGS (old))
+	      /* Don't forget explicit template arguments in a pack.  */
+	      ARGUMENT_PACK_EXPLICIT_ARGS (new_)
+		= ARGUMENT_PACK_EXPLICIT_ARGS (old);
+	    TREE_VEC_ELT (targs, i) = new_;
+	  }
     }
   if (good)
     return true;
diff --git a/gcc/testsuite/g++.dg/cpp0x/variadic159.C b/gcc/testsuite/g++.dg/cpp0x/variadic159.C
new file mode 100644
index 000000000000..2b14d3005f01
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/variadic159.C
@@ -0,0 +1,14 @@
+// PR c++/61507
+// { dg-do compile { target c++11 } }
+
+struct A {
+  void foo(const int &);
+  void foo(float);
+};
+
+template <typename... Args>
+void bar(void (A::*memfun)(Args...), Args... args);
+
+void go(const int& i) {
+  bar<const int &>(&A::foo, i);
+}
-- 
2.47.2