re PR c++/64727 (g++.dg/torture/darwin-cfstring-3.C:11:80: internal compiler…

re PR c++/64727 (g++.dg/torture/darwin-cfstring-3.C:11:80: internal compiler error: Segmentation fault: 11)

	PR c++/64727
	* constexpr.c (cxx_eval_constant_expression): Allow for lvalue use
	of CONST_DECL.

From-SVN: r220041

gcc/cp/ChangeLog

+2015-01-23  Jason Merrill  <jason@redhat.com>
+
+	PR c++/64727
+	* constexpr.c (cxx_eval_constant_expression): Allow for lvalue use
+	of CONST_DECL.
+
 2015-01-21  Jason Merrill  <jason@redhat.com>
 
 	PR c++/64603

gcc/cp/constexpr.c

@@ -2955,10 +2955,11 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
       return (*ctx->values->get (t));
 
     case VAR_DECL:
+    case CONST_DECL:
+      /* We used to not check lval for CONST_DECL, but darwin.c uses
+	 CONST_DECL for aggregate constants.  */
       if (lval)
 	return t;
-      /* else fall through. */
-    case CONST_DECL:
       if (ctx->strict)
 	r = decl_really_constant_value (t);
       else