--- a/rrd.c	2020/09/23 07:41:40	350617
+++ b/rrd.c	2020/09/23 09:09:08	350618
@@ -552,6 +552,9 @@
 	ZEND_ARG_INFO(0, file)
 	ZEND_ARG_INFO(0, options)
 ZEND_END_ARG_INFO()
+
+ZEND_BEGIN_ARG_INFO(arginfo_rrd_void, 0)
+ZEND_END_ARG_INFO()
 /* }}} */
 
 /* {{{ */
@@ -559,7 +562,7 @@
 	PHP_FE(rrd_update, arginfo_rrd_update)
 	PHP_FE(rrd_create, arginfo_rrd_create)
 	PHP_FE(rrd_graph, arginfo_rrd_graph)
-	PHP_FE(rrd_error, NULL)
+	PHP_FE(rrd_error, arginfo_rrd_void)
 	PHP_FE(rrd_fetch, arginfo_rrd_fetch)
 	PHP_FE(rrd_first, arginfo_rrd_first)
 	PHP_FE(rrd_info, arginfo_rrd_info)
@@ -569,9 +572,9 @@
 	PHP_FE(rrd_tune, arginfo_rrd_tune)
 	PHP_FE(rrd_xport, arginfo_rrd_xport)
 #ifdef HAVE_RRDC_DISCONNECT
-	PHP_FE(rrdc_disconnect, NULL)
+	PHP_FE(rrdc_disconnect, arginfo_rrd_void)
 #endif
-	PHP_FE(rrd_version, NULL)
+	PHP_FE(rrd_version, arginfo_rrd_void)
 	PHP_FE_END
 };
 /* }}} */
--- a/rrd_create.c	2020/09/23 07:41:40	350617
+++ b/rrd_create.c	2020/09/23 09:09:08	350618
@@ -323,10 +323,13 @@
 	ZEND_ARG_INFO(0, description)
 ZEND_END_ARG_INFO()
 
+ZEND_BEGIN_ARG_INFO_EX(arginfo_rrdcreator_void, 0, 0, 0)
+ZEND_END_ARG_INFO()
+
 /* class method table */
 static zend_function_entry rrd_create_methods[] = {
 	PHP_ME(RRDCreator, __construct, arginfo_rrdcreator_construct, ZEND_ACC_PUBLIC)
-	PHP_ME(RRDCreator, save, NULL, ZEND_ACC_PUBLIC)
+	PHP_ME(RRDCreator, save, arginfo_rrdcreator_void, ZEND_ACC_PUBLIC)
 	PHP_ME(RRDCreator, addDataSource, arginfo_rrdcreator_description, ZEND_ACC_PUBLIC)
 	PHP_ME(RRDCreator, addArchive, arginfo_rrdcreator_description, ZEND_ACC_PUBLIC)
 	PHP_FE_END
--- a/rrd_graph.c	2020/09/23 07:41:40	350617
+++ b/rrd_graph.c	2020/09/23 09:09:08	350618
@@ -140,6 +140,7 @@
 	array_init(&zv_argv);
 
 	ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL(obj->zv_arr_options), num_key, zs_key, zv_option_val) {
+		(void)num_key; /* to avoid -Wunused-but-set-variable */
 		smart_string option = {0}; /* one argument option */
 
 		/* option with string key means long option, hence they are used as
@@ -356,6 +357,9 @@
 /* }}} */
 
 /* arguments */
+ZEND_BEGIN_ARG_INFO_EX(arginfo_rrd_void, 0, 0, 0)
+ZEND_END_ARG_INFO()
+
 ZEND_BEGIN_ARG_INFO_EX(arginfo_rrd_path, 0, 0, 1)
 	ZEND_ARG_INFO(0, path)
 ZEND_END_ARG_INFO()
@@ -367,8 +371,8 @@
 /* class method table */
 static zend_function_entry rrd_graph_methods[] = {
 	PHP_ME(RRDGraph, __construct, arginfo_rrd_path, ZEND_ACC_PUBLIC)
-	PHP_ME(RRDGraph, save, NULL, ZEND_ACC_PUBLIC)
-	PHP_ME(RRDGraph, saveVerbose, NULL, ZEND_ACC_PUBLIC)
+	PHP_ME(RRDGraph, save, arginfo_rrd_void, ZEND_ACC_PUBLIC)
+	PHP_ME(RRDGraph, saveVerbose, arginfo_rrd_void, ZEND_ACC_PUBLIC)
 	PHP_ME(RRDGraph, setOptions, arginfo_rrd_options, ZEND_ACC_PUBLIC)
 	PHP_FE_END
 };