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

+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

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.  */

gcc/testsuite/ChangeLog

 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.

gcc/testsuite/g++.dg/cpp0x/constexpr-base3.C

+// 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 ();
+}