From 8c71382973462c5ac36e8740c692066020eedfe8 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Fri, 27 Jan 2012 18:55:55 +0100
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	PR c++/51852
	* pt.c (tsubst_pack_expansion): Delete and restore
	local_specialization whenever need_local_specialization, not just
	when saved_local_specializations is non-NULL.

	* g++.dg/other/gc5.C: New test.

From-SVN: r183637
---
 gcc/cp/ChangeLog                 |  7 +++++++
 gcc/cp/pt.c                      |  2 +-
 gcc/testsuite/ChangeLog          |  5 +++++
 gcc/testsuite/g++.dg/other/gc5.C | 27 +++++++++++++++++++++++++++
 4 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/other/gc5.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 3df6d1102fc..9753bedb40c 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,10 @@
+2012-01-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/51852
+	* pt.c (tsubst_pack_expansion): Delete and restore
+	local_specialization whenever need_local_specialization, not just
+	when saved_local_specializations is non-NULL.
+
 2012-01-26  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/51370
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index e440be706cf..ad2b4dfc736 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -9582,7 +9582,7 @@ tsubst_pack_expansion (tree t, tree args, tsubst_flags_t complain,
         }
     }
 
-  if (saved_local_specializations)
+  if (need_local_specializations)
     {
       htab_delete (local_specializations);
       local_specializations = saved_local_specializations;
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index d7f276a9b3f..31ea283ee4b 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2012-01-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/51852
+	* g++.dg/other/gc5.C: New test.
+
 2012-01-27  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/50444
diff --git a/gcc/testsuite/g++.dg/other/gc5.C b/gcc/testsuite/g++.dg/other/gc5.C
new file mode 100644
index 00000000000..a369084e00c
--- /dev/null
+++ b/gcc/testsuite/g++.dg/other/gc5.C
@@ -0,0 +1,27 @@
+// PR c++/51852
+// { dg-do compile }
+// { dg-options "-std=gnu++11 --param ggc-min-heapsize=0 --param ggc-min-expand=0" }
+
+template <typename, typename>
+class transformed {};
+
+template <class R, class F>
+transformed<F, R> transform (R r, F f);
+
+template <typename, typename>
+class joined {};
+
+template <typename T, typename U>
+joined<T, U> join (T t, U u);
+
+template <typename T, typename U, typename V, typename... Rest>
+auto join (T t, U u, V v, Rest... rest) -> decltype (join (join (t, u), v, rest...));
+
+template <typename F, typename... Rs>
+auto polymorphic_transform (F f, Rs... rs) -> decltype (join (transform(rs, f)...));
+
+int
+main ()
+{
+  polymorphic_transform (0, 0, 0);
+}
-- 
2.30.2