Bug#28099963 POSSIBLY UNUSED FUNCTIONS IN XDR_UTILS

Problem
-------
Clang generates warnings when compiling XCom.

Analysis
--------
We make use of the define_xdr_funcs macro even when we do not need all the
functions it generates.

Solution
--------
The community contributed a patch that marked all the functions generated by
define_xdr_funcs as unused. The patch's approach fixes the symptoms by telling
the compiler that all the functions generated by the define_xdr_funcs are always
unused. That is not true, although it does shut the compiler up.

Since the contributed patch does not apply cleanly anymore, we improve on the
submitted patch by only generating the functions that are needed.

Reviewed-by: Luis Soares <luis.soares@oracle.com>

rapid/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/app_data.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
+/* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -33,8 +33,7 @@
 #include "node_list.h"
 #include "xcom_vp_str.h"
 
-define_xdr_funcs(synode_no)
-define_xdr_funcs(app_data_ptr)
+clone_xdr_array(synode_no)
 
 static app_data_list nextp(app_data_list l);
 static unsigned long msg_count(app_data_ptr a);

rapid/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/site_def.c

@@ -45,7 +45,9 @@ struct site_def_ptr_array {
 };
 typedef struct site_def_ptr_array site_def_ptr_array;
 
-define_xdr_funcs(site_def_ptr)
+init_xdr_array(site_def_ptr)
+free_xdr_array(site_def_ptr)
+set_xdr_array(site_def_ptr)
 
 /* FIFO of site definitions */
 static site_def_ptr_array site_defs;

rapid/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/synode_no.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
+/* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -60,8 +60,6 @@ int	synode_gt(synode_no x, synode_no y)
 }
 
 /* purecov: begin deadcode */
-define_xdr_funcs(synode_no)
-
 synode_no vp_count_to_synode(u_long high, u_long low, node_no nodeid,
                              uint32_t groupid)
 {

rapid/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/task.c

@@ -87,8 +87,14 @@ typedef struct {
   task_env_p *task_env_p_array_val;
 } task_env_p_array;
 
-define_xdr_funcs(pollfd)
-define_xdr_funcs(task_env_p)
+init_xdr_array(pollfd)
+free_xdr_array(pollfd)
+set_xdr_array(pollfd)
+get_xdr_array(pollfd)
+init_xdr_array(task_env_p)
+free_xdr_array(task_env_p)
+set_xdr_array(task_env_p)
+get_xdr_array(task_env_p)
 
 struct iotasks {
   int nwait;

rapid/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_base.c

@@ -506,9 +506,6 @@ static bool_t is_dead_site(uint32_t id)
 	return FALSE;
 }
 
-define_xdr_funcs(node_no)
-
-
 extern node_set *init_node_set(node_set *set, u_int n);
 extern node_set *alloc_node_set(node_set *set, u_int n);
 

rapid/plugin/group_replication/libmysqlgcs/src/bindings/xcom/xcom/xcom_recover.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
+/* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -45,9 +45,6 @@ int	client_boot_done = 0;
 int	netboot_ok = 0;
 int	booting = 0;
 
-define_xdr_funcs(synode_no)
-define_xdr_funcs(app_data_ptr)
-
 /* purecov: begin deadcode */
 void init_recover_vars()
 {