From 2602f8fe61dcf2388890bbbdb938e46ce9d2936b Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Mon, 20 Jun 2011 10:40:10 -0400
Subject: [PATCH] re PR c++/49205 ([C++0x] Default constructor with pack
 expansion parameter not detected)

	PR c++/49205
	* call.c (sufficient_parms_p): Allow parameter packs too.

From-SVN: r175214
---
 gcc/cp/ChangeLog                              |  3 +++
 gcc/cp/call.c                                 |  7 ++++---
 gcc/testsuite/ChangeLog                       |  3 +++
 gcc/testsuite/g++.dg/cpp0x/variadic-default.C | 12 ++++++++++++
 4 files changed, 22 insertions(+), 3 deletions(-)
 create mode 100644 gcc/testsuite/g++.dg/cpp0x/variadic-default.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 1746670..87e5164 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,8 @@
 2011-06-20  Jason Merrill  <jason@redhat.com>
 
+	PR c++/49205
+	* call.c (sufficient_parms_p): Allow parameter packs too.
+
 	PR c++/43321
 	* semantics.c (describable_type): Remove.
 	* cp-tree.h: Likewise.
diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 05bf983..09d73d0 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -534,15 +534,16 @@ null_ptr_cst_p (tree t)
   return false;
 }
 
-/* Returns nonzero if PARMLIST consists of only default parms and/or
-   ellipsis.  */
+/* Returns nonzero if PARMLIST consists of only default parms,
+   ellipsis, and/or undeduced parameter packs.  */
 
 bool
 sufficient_parms_p (const_tree parmlist)
 {
   for (; parmlist && parmlist != void_list_node;
        parmlist = TREE_CHAIN (parmlist))
-    if (!TREE_PURPOSE (parmlist))
+    if (!TREE_PURPOSE (parmlist)
+	&& !PACK_EXPANSION_P (TREE_VALUE (parmlist)))
       return false;
   return true;
 }
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 6bfc81b..abc6245 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2011-06-20  Jason Merrill  <jason@redhat.com>
 
+	PR c++/49205
+	* g++.dg/cpp0x/variadic-default.C: New.
+
 	PR c++/43321
 	* g++.dg/cpp0x/auto26.C: New.
 
diff --git a/gcc/testsuite/g++.dg/cpp0x/variadic-default.C b/gcc/testsuite/g++.dg/cpp0x/variadic-default.C
new file mode 100644
index 0000000..2625e25
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/variadic-default.C
@@ -0,0 +1,12 @@
+// PR c++/49205
+// { dg-options -std=c++0x }
+
+#include <initializer_list>
+
+struct A {
+  template<typename ...T> A(T...);
+  A(std::initializer_list<short>);
+  A(std::initializer_list<long>);
+};
+
+A a{};
-- 
2.7.4