parser.c (cp_parser_simple_declaration): Diagnose function declaration among…

parser.c (cp_parser_simple_declaration): Diagnose function declaration among more than one init-declarators with auto...

	* parser.c (cp_parser_simple_declaration): Diagnose function
	declaration among more than one init-declarators with auto
	specifier.

	* g++.dg/cpp1y/auto-fn34.C: New test.

From-SVN: r244071

gcc/cp/ChangeLog

 2017-01-04  Jakub Jelinek  <jakub@redhat.com>
 
+	* parser.c (cp_parser_simple_declaration): Diagnose function
+	declaration among more than one init-declarators with auto
+	specifier.
+
 	PR c++/71182
 	* parser.c (cp_lexer_previous_token): Use vec_safe_address in the
 	assertion, as lexer->buffer may be NULL.

gcc/cp/parser.c

@@ -12723,8 +12723,17 @@ cp_parser_simple_declaration (cp_parser* parser,
       break;
 
   tree last_type;
+  bool auto_specifier_p;
+  /* NULL_TREE if both variable and function declaration are allowed,
+     error_mark_node if function declaration are not allowed and
+     a FUNCTION_DECL that should be diagnosed if it is followed by
+     variable declarations.  */
+  tree auto_function_declaration;
 
   last_type = NULL_TREE;
+  auto_specifier_p
+    = decl_specifiers.type && type_uses_auto (decl_specifiers.type);
+  auto_function_declaration = NULL_TREE;
 
   /* Keep going until we hit the `;' at the end of the simple
      declaration.  */
@@ -12770,6 +12779,26 @@ cp_parser_simple_declaration (cp_parser* parser,
       if (cp_parser_error_occurred (parser))
 	goto done;
 
+      if (auto_specifier_p && cxx_dialect >= cxx14)
+	{
+	  /* If the init-declarator-list contains more than one
+	     init-declarator, they shall all form declarations of
+	     variables.  */
+	  if (auto_function_declaration == NULL_TREE)
+	    auto_function_declaration
+	      = TREE_CODE (decl) == FUNCTION_DECL ? decl : error_mark_node;
+	  else if (TREE_CODE (decl) == FUNCTION_DECL
+		   || auto_function_declaration != error_mark_node)
+	    {
+	      error_at (decl_specifiers.locations[ds_type_spec],
+			"non-variable %qD in declaration with more than one "
+			"declarator with placeholder type",
+			TREE_CODE (decl) == FUNCTION_DECL
+			? decl : auto_function_declaration);
+	      auto_function_declaration = error_mark_node;
+	    }
+	}
+
       if (auto_result)
 	{
 	  if (last_type && last_type != error_mark_node

gcc/testsuite/ChangeLog

 2017-01-04  Jakub Jelinek  <jakub@redhat.com>
 
+	* g++.dg/cpp1y/auto-fn34.C: New test.
+
 	PR c++/71182
 	* g++.dg/cpp0x/pr71182.C: New test.
 

gcc/testsuite/g++.dg/cpp1y/auto-fn34.C

+// { dg-do compile { target c++14 } }
+
+auto f1 ();
+auto a = 5, f2 ();		// { dg-error "in declaration with more than one declarator" }
+auto f3 (), b = 6;		// { dg-error "in declaration with more than one declarator" }
+auto f4 (), f5 (), f6 ();	// { dg-error "in declaration with more than one declarator" }
+auto f1 () { return 3; }
+auto f2 () { return 4; }
+auto f3 () { return 5; }
+auto f4 () { return 6; }
+auto f5 () { return 7; }
+auto f6 () { return 8; }