re PR c++/35741 (ICE with offsetof and references)

	PR c++/35741
	* semantics.c (finish_offsetof): Undo effect of convert_from_reference
	before calling fold_offsetof.

	* g++.dg/other/offsetof5.C: New test.

From-SVN: r133863

gcc/cp/ChangeLog

+2008-04-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/35741
+	* semantics.c (finish_offsetof): Undo effect of convert_from_reference
+	before calling fold_offsetof.
+
 2008-04-03  Tom Tromey  <tromey@redhat.com>
 
 	* Make-lang.in (c++_OBJS): New variable.

gcc/cp/semantics.c

@@ -3039,6 +3039,8 @@ finish_offsetof (tree expr)
       error ("cannot apply %<offsetof%> to member function %qD", expr);
       return error_mark_node;
     }
+  if (TREE_CODE (expr) == INDIRECT_REF && REFERENCE_REF_P (expr))
+    expr = TREE_OPERAND (expr, 0);
   return fold_offsetof (expr, NULL_TREE);
 }
 

gcc/testsuite/ChangeLog

+2008-04-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/35741
+	* g++.dg/other/offsetof5.C: New test.
+
 2008-04-03  Paolo Bonzini  <bonzini@gnu.org>
 
 	PR rtl-optimization/35281

gcc/testsuite/g++.dg/other/offsetof5.C

+// PR c++/35741
+// { dg-do compile }
+
+#include <stddef.h>
+
+struct A
+{
+  char c;
+  int &i;
+};
+
+int j = offsetof (A, i);		// { dg-warning "invalid access|offsetof" }
+
+template <typename T>
+struct S
+{
+  T h;
+  T &i;
+  static const int j = offsetof (S, i);	// { dg-warning "invalid access|offsetof" }
+};
+
+int k = S<int>::j;			// { dg-warning "instantiated from here" }