Fixes of compilation warnings and errors.

sql/mysql_priv.h:
  Removing compiler warning "NULL used in arithmetic"
sql/mysqld.cc:
  First argument to WARN_DEPRECATED is supposed to be a pointer (to THD structure)
sql/sql_insert.cc:
  Removing compiler warning "unused variable". Apparently query is not used when compiling libmysqld.
sql/sql_yacc.yy:
  Removing compiler error "Macro already defined"

sql/mysql_priv.h

@@ -100,7 +100,7 @@ void net_set_read_timeout(NET *net, uint timeout);
 #define WARN_DEPRECATED(Thd,Ver,Old,New)                                             \
   do {                                                                               \
     DBUG_ASSERT(strncmp(Ver, MYSQL_SERVER_VERSION, sizeof(Ver)-1) > 0);              \
-    if (Thd != NULL)                                                                 \
+    if (((gptr)Thd) != NULL)                                                         \
       push_warning_printf(((THD *)Thd), MYSQL_ERROR::WARN_LEVEL_WARN,                \
                         ER_WARN_DEPRECATED_SYNTAX, ER(ER_WARN_DEPRECATED_SYNTAX),    \
                         (Old), (Ver), (New));                                        \

sql/mysqld.cc

@@ -6957,7 +6957,7 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
     if (!slave_warning_issued)                 //only show the warning once
     {
       slave_warning_issued = true;   
-      WARN_DEPRECATED(0, "5.2", "for replication startup options", 
+      WARN_DEPRECATED(NULL, "5.2", "for replication startup options", 
         "'CHANGE MASTER'");
     }
     break;

sql/sql_insert.cc

@@ -381,7 +381,9 @@ bool mysql_insert(THD *thd,TABLE_LIST *table_list,
   List_item *values;
   Name_resolution_context *context;
   Name_resolution_context_state ctx_state;
+#ifndef EMBEDDED_LIBRARY
   char *query= thd->query;
+#endif
   bool log_on= (thd->options & OPTION_BIN_LOG) ||
     (!(thd->security_ctx->master_access & SUPER_ACL));
   thr_lock_type lock_type = table_list->lock_type;

sql/sql_yacc.yy

@@ -46,6 +46,7 @@ const LEX_STRING null_lex_str={0,0};
 
 #define yyoverflow(A,B,C,D,E,F) {ulong val= *(F); if (my_yyoverflow((B), (D), &val)) { yyerror((char*) (A)); return 2; } else { *(F)= (YYSIZE_T)val; }}
 
+#undef 	WARN_DEPRECATED			/* this macro is also defined in mysql_priv.h */
 #define WARN_DEPRECATED(A,B)                                        \
   push_warning_printf(((THD *)yythd), MYSQL_ERROR::WARN_LEVEL_WARN, \
 		      ER_WARN_DEPRECATED_SYNTAX,                    \