Do not diagnose lambda default arguments in c++14 modes.

	* parser.c (cp_parser_lambda_declarator_opt): Make the pedwarn
	conditional.

From-SVN: r215274

gcc/cp/ChangeLog

+2014-09-15  Ville Voutilainen  <ville.voutilainen@gmail.com>
+
+	Do not diagnose lambda default arguments in c++14 modes.
+	* parser.c (cp_parser_lambda_declarator_opt): Make the pedwarn
+	conditional.
+
 2014-09-15  Jakub Jelinek  <jakub@redhat.com>
 
 	* Make-lang.in (check_g++_parallelize): Change to just an upper bound

gcc/cp/parser.c

@@ -9222,7 +9222,7 @@ cp_parser_lambda_declarator_opt (cp_parser* parser, tree lambda_expr)
       /* Default arguments shall not be specified in the
 	 parameter-declaration-clause of a lambda-declarator.  */
       for (tree t = param_list; t; t = TREE_CHAIN (t))
-	if (TREE_PURPOSE (t))
+	if (TREE_PURPOSE (t) && cxx_dialect < cxx14)
 	  pedwarn (DECL_SOURCE_LOCATION (TREE_VALUE (t)), OPT_Wpedantic,
 		   "default argument specified for lambda parameter");
 

gcc/testsuite/g++.dg/cpp0x/lambda/lambda-defarg.C

@@ -2,5 +2,5 @@
 
 int main()
 {
-  [](int a = 1) { return a; }(); // { dg-error "" }
+  [](int a = 1) { return a; }(); // { dg-error "default argument" "" { target { c++11_only } } }
 }