optimize.c (initialize_inlined_parameters): Don't set TREE_READONLY for a…

optimize.c (initialize_inlined_parameters): Don't set TREE_READONLY for a VAR_DECL taking the place of an inlined PARM_DECL.

	* optimize.c (initialize_inlined_parameters): Don't set
	TREE_READONLY for a VAR_DECL taking the place of an inlined
	PARM_DECL.

From-SVN: r42480

gcc/cp/ChangeLog

+2001-05-22  Mark Mitchell  <mark@codesourcery.com>
+
+	* optimize.c (initialize_inlined_parameters): Don't set
+	TREE_READONLY for a VAR_DECL taking the place of an inlined
+	PARM_DECL.
+
 2001-05-22  Jason Merrill  <jason_merrill@redhat.com>
 
 	* class.c, cp-tree.h, rtti.c: Remove com_interface attribute support.

gcc/cp/optimize.c

@@ -498,6 +498,18 @@ initialize_inlined_parameters (id, args, fn)
 	DECL_INITIAL (var) = value;
       else
 	{
+	  /* Even if P was TREE_READONLY, the new VAR should not be.
+	     In the original code, we would have constructed a
+	     temporary, and then the function body would have never
+	     changed the value of P.  However, now, we will be
+	     constructing VAR directly.  The constructor body may
+	     change its value multiple times as it is being
+	     constructed.  Therefore, it must not be TREE_READONLY;
+	     the back-end assumes that TREE_READONLY variable is
+	     assigned to only once.  */
+	  TREE_READONLY (var) = 0;
+
+	  /* Build a run-time initialization.  */
 	  init_stmt = build_stmt (EXPR_STMT,
 				  build (INIT_EXPR, TREE_TYPE (p),
 					 var, value));