From e26ab5ecd292a31bbae2108502ff532db2d6f245 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Sat, 20 Nov 2010 00:50:21 +0100
Subject: [PATCH] re PR c++/46526 (VTable Problem?)

	PR c++/46526
	* semantics.c (cxx_eval_call_expression): Unshare the result.

	* g++.dg/cpp0x/constexpr-base3.C: New test.

From-SVN: r166967
---
 gcc/cp/ChangeLog                             |  5 ++++
 gcc/cp/semantics.c                           |  2 +-
 gcc/testsuite/ChangeLog                      |  3 +++
 gcc/testsuite/g++.dg/cpp0x/constexpr-base3.C | 27 ++++++++++++++++++++
 4 files changed, 36 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/cpp0x/constexpr-base3.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index b192ed150db5..e3d97d22d559 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2010-11-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/46526
+	* semantics.c (cxx_eval_call_expression): Unshare the result.
+
 2010-11-19  Nicola Pero  <nicola.pero@meta-innovation.com>
 
 	* parser.c (cp_parser_objc_protocol_declaration): Pass attributes
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index 38e03f6060de..9b565daed840 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -6042,7 +6042,7 @@ cxx_eval_call_expression (const constexpr_call *old_call, tree t,
     }
 
   pop_cx_call_context ();
-  return result;
+  return unshare_expr (result);
 }
 
 /* FIXME speed this up, it's taking 16% of compile time on sieve testcase.  */
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 38a694cf3d54..1a543089601a 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2010-11-20  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/46526
+	* g++.dg/cpp0x/constexpr-base3.C: New test.
+
 	PR tree-optimization/45830
 	* gcc.target/i386/pr45830.c: New test.
 	* gcc.c-torture/execute/pr45830.c: New test.
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-base3.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-base3.C
new file mode 100644
index 000000000000..cffe9ea240c7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-base3.C
@@ -0,0 +1,27 @@
+// PR c++/46526
+// { dg-do run }
+// { dg-options "-std=c++0x" }
+
+struct Base
+{
+  virtual int getid () = 0;
+};
+
+struct A : public Base
+{
+  virtual int getid () { return 1; }
+};
+
+struct B : public Base
+{
+  virtual int getid () { throw "here"; }
+};
+
+int
+main ()
+{
+  A a;
+  B b;
+  Base& ar = a;
+  ar.getid ();
+}