re PR c++/70572 (ICE on code with decltype (auto) in digest_init_r, at…

re PR c++/70572 (ICE on code with decltype (auto) in digest_init_r, at cp/typeck2.c:1103 with -std=c++14)

/cp
2016-05-20  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/70572
	* decl.c (cp_finish_decl): Check do_auto_deduction return value
	and return immediately in case of erroneous code.

/testsuite
2016-05-20  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/70572
	* g++.dg/cpp1y/auto-fn31.C: New.

From-SVN: r236522

gcc/cp/ChangeLog

+2016-05-20  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/70572
+	* decl.c (cp_finish_decl): Check do_auto_deduction return value
+	and return immediately in case of erroneous code.
+
 2016-05-19  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/71075

gcc/cp/decl.c

@@ -6609,6 +6609,13 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
                                                    adc_variable_type);
       if (type == error_mark_node)
 	return;
+      if (TREE_CODE (type) == FUNCTION_TYPE)
+	{
+	  error ("initializer for %<decltype(auto) %D%> has function type "
+		 "(did you forget the %<()%> ?)", decl);
+	  TREE_TYPE (decl) = error_mark_node;
+	  return;
+	}
       cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
     }
 

gcc/testsuite/ChangeLog

+2016-05-20  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/70572
+	* g++.dg/cpp1y/auto-fn31.C: New.
+
 2016-05-20  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/70738

gcc/testsuite/g++.dg/cpp1y/auto-fn31.C

+// PR c++/70572
+// { dg-do compile { target c++14 } }
+
+void foo ()
+{
+  decltype (auto) a = foo;  // { dg-error "initializer" }
+}