re PR c++/47132 ([C++0x] decltype can't deduce some operator return types when…

re PR c++/47132 ([C++0x] decltype can't deduce some operator return types when defining an auto function's return)

	PR c++/47132
	* mangle.c (write_expression): Handle MODOP_EXPR.

From-SVN: r174357

gcc/cp/ChangeLog

 2011-05-27  Jason Merrill  <jason@redhat.com>
 
+	PR c++/47132
+	* mangle.c (write_expression): Handle MODOP_EXPR.
+
 	PR c++/47277
 	* parser.c (cp_parser_unqualified_id): Don't check
 	constructor_name_p for enums.

gcc/cp/mangle.c

@@ -2599,6 +2599,15 @@ write_expression (tree expr)
       write_unqualified_id (fn);
       write_template_args (TREE_OPERAND (expr, 1));
     }
+  else if (TREE_CODE (expr) == MODOP_EXPR)
+    {
+      enum tree_code subop = TREE_CODE (TREE_OPERAND (expr, 1));
+      const char *name = (assignment_operator_name_info[(int) subop]
+			  .mangled_name);
+      write_string (name);
+      write_expression (TREE_OPERAND (expr, 0));
+      write_expression (TREE_OPERAND (expr, 2));
+    }
   else
     {
       int i, len;

gcc/testsuite/ChangeLog

 2011-05-27  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/abi/mangle47.C: New.
+
 	PR c++/49176
 	* g++.dg/template/const5.C: New.
 

gcc/testsuite/g++.dg/abi/mangle47.C

+// PR c++/47132
+// { dg-options -std=c++0x }
+// { dg-final { scan-assembler "_Z1fIiEDToRfp_Li1EET_" } }
+
+template <typename T>
+auto f (T t) -> decltype(t |= 1);
+
+int main()
+{
+  f(1);
+}