re PR c++/49418 (G++ discards cv-quals from template parameter types)

	PR c++/49418
	* call.c (cxx_type_promotes_to): Don't strip cv-quals.
	* semantics.c (lambda_return_type): Strip them here.

From-SVN: r175271

gcc/cp/ChangeLog

+2011-06-21  Jason Merrill  <jason@redhat.com>
+
+	PR c++/49418
+	* call.c (cxx_type_promotes_to): Don't strip cv-quals.
+	* semantics.c (lambda_return_type): Strip them here.
+
 2011-06-21  Andrew MacLeod  <amacleod@redhat.com>
 
 	* semantics.c: Add sync_ or SYNC__ to builtin names.

gcc/cp/call.c

@@ -2640,8 +2640,6 @@ type_decays_to (tree type)
     return build_pointer_type (TREE_TYPE (type));
   if (TREE_CODE (type) == FUNCTION_TYPE)
     return build_pointer_type (type);
-  if (!MAYBE_CLASS_TYPE_P (type))
-    type = cv_unqualified (type);
   return type;
 }
 

gcc/cp/semantics.c

@@ -8177,7 +8177,7 @@ lambda_return_type (tree expr)
       SET_TYPE_STRUCTURAL_EQUALITY (type);
     }
   else
-    type = type_decays_to (unlowered_expr_type (expr));
+    type = cv_unqualified (type_decays_to (unlowered_expr_type (expr)));
   return type;
 }
 

gcc/testsuite/ChangeLog

+2011-06-21  Jason Merrill  <jason@redhat.com>
+
+	PR c++/49418
+	* g++.dg/template/param3.C: New.
+
 2011-06-21  Bernd Schmidt  <bernds@codesourcery.com>
 
 	* gcc.c-torture/excute/builtin-bitops-1.c (MAKE_FUNS): Make

gcc/testsuite/g++.dg/template/param3.C

+// PR c++/49418
+
+template <class T>
+void f (const T t)
+{
+  t = 1;			// { dg-error "" }
+}
+
+int main()
+{
+  f(1);
+}