re PR c++/41815 ([C++0x] GCC wrongly treats rvalues of non-class type cv-qualified)

	PR c++/41815
	* call.c (build_call_a): Strip cv-quals from rvalue result.

From-SVN: r153862

gcc/cp/ChangeLog

 2009-11-03  Jason Merrill  <jason@redhat.com>
 
+	PR c++/41815
+	* call.c (build_call_a): Strip cv-quals from rvalue result.
+
 	PR c++/40944
 	* call.c (initialize_reference): Add complain parm.
 	* typeck.c (convert_for_initialization): Pass it.

gcc/cp/call.c

@@ -313,6 +313,9 @@ build_call_a (tree function, int n, tree *argarray)
   gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE
 	      || TREE_CODE (fntype) == METHOD_TYPE);
   result_type = TREE_TYPE (fntype);
+  /* An rvalue has no cv-qualifiers.  */
+  if (SCALAR_TYPE_P (result_type) || VOID_TYPE_P (result_type))
+    result_type = cv_unqualified (result_type);
 
   if (TREE_CODE (function) == ADDR_EXPR
       && TREE_CODE (TREE_OPERAND (function, 0)) == FUNCTION_DECL)

gcc/testsuite/ChangeLog

 2009-11-03  Jason Merrill  <jason@redhat.com>
 
+	PR c++/41815
+	* g++.dg/cpp0x/rv-return.C: New.
+	* g++.dg/cpp0x/deduce.C: Adjust.
+
 	PR c++/40944
 	* g++.dg/template/sfinae15.C: New.
 

gcc/testsuite/g++.dg/cpp0x/deduce.C

@@ -5,7 +5,7 @@ template<typename T> struct same_type<T, T> {};
 int lval_int;
 int rval_int();
 int const lval_const_int=0;
-int const rval_const_int();
+int const&& rval_const_int();
 
 template <typename T> void deduce_lval_int(T && t)
 {

gcc/testsuite/g++.dg/cpp0x/rv-return.C

+// PR c++/41815
+// { dg-options -std=c++0x }
+
+template<typename T, typename U> struct same_type;
+template<typename T> struct same_type<T, T> {};
+
+int const f() { return 0; }
+
+int &&r = f(); // binding "int&&" to "int" should succeed
+same_type<decltype(f()), int const> s1;
+same_type<decltype(0,f()), int> s2;
+
+template <class T>
+T const g() { return 0; }
+
+int &&r2 = g<int>();
+same_type<decltype(g<int>()), int const> s3;
+same_type<decltype(0,g<int>()), int> s4;