Compatibility between MySQL versions improved, ease compilation

Makefile.decl

@@ -4,26 +4,11 @@ mysql_CFLAGS = `mysql_config --cflags`
 
 vn_mysql_libdir = /usr/lib/mysql/plugin
 
-if MYSQL8
-
-MYSQLD_SOURCE = /var/mysql/mysql-8.0.15
 vn_mysql_CFLAGS = \
 	-Wall -O3 \
-	-DMYSQL8=1 \
 	-I$(MYSQLD_SOURCE)/include \
-	-I$(MYSQLD_SOURCE) \
-	-I$(MYSQLD_SOURCE)/bld/include \
-	-I$(MYSQLD_SOURCE)libbinlogevents/export \
 	$(mysql_CFLAGS)
 
-else
-
-vn_mysql_CFLAGS = \
-	-Wall -O3 \
-	$(mysql_CFLAGS)
-
-endif
-
 vn_mysql_LDFLAGS = \
 	-no-undefined \
 	-module \

README.md

@@ -10,21 +10,37 @@ Install basic tools for compiling.
 $ apt-get install build-essential devscripts dh-autoreconf
 ```
 
-Install MySQL and GLib development libraries.
+Install MySQL development libraries.
 ```
-$ apt-get install libmysqld-dev libglib2.0-dev
+$ apt-get install libmysqld-dev
 ```
 
-Compile and generate Debian package for MySQL 5.
+If MySQL development libraries are not available for your distribution or MySQL 
+version you can obtain MySQL server source code from apt sources repository or
+from MySQL page.
+```
+$ apt-get source mysql-community
+```
+
+Install GLib development libraries.
+```
+$ apt-get install libglib2.0-dev
+```
+
+Run autogen.
 ```
 $ ./autogen.sh
+```
+
+Compile and generate Debian package.
+```
 $ debuild -uc -us -b
 ```
 
-Compile and generate Debian package for MySQL 8.
+If development libraries are not available and you have downloaded the server
+source code, you can tell the build command it's location.
 ```
-$ ./autogen.sh
-$ debuild --set-envvar MYSQL8=TRUE -uc -us -b
+$ debuild --set-envvar MYSQLD_SOURCE=[mysqld_source_dir] -uc -us -b
 ```
 
 ## Installing
@@ -52,6 +68,13 @@ DROP FUNCTION IF EXISTS multimax;
 DROP FUNCTION IF EXISTS sql_printf;
 ```
 
+## Commands
+
+Obtain MySQL version from commandline.
+```
+$ mysql_config --version | cut -d "." -f 1
+```
+
 ## Built with
 
  * [MySQL](https://dev.mysql.com/doc/refman/8.0/en/extending-mysql.html)

configure.ac

@@ -13,8 +13,6 @@ AC_PROG_CXX
 AC_PROG_CC
 PKG_CHECK_MODULES([glib], [glib-2.0])
 
-AM_CONDITIONAL([MYSQL8], [test ! -z "$MYSQL8"])
-
 AC_CONFIG_FILES([
 	Makefile
 	proxy-auth/Makefile

proxy-auth/proxy-auth.cc

@@ -20,20 +20,12 @@
 #include <string.h>
 #include <glib-unix.h>
 
-#ifndef MYSQL8
 #define MYSQL_ABI_CHECK
-#endif
 
-//#include <stdbool.h>
 #include <mysql.h>
 #include <mysql/errmsg.h>
 #include <mysql/plugin_auth.h>
 
-#ifdef MYSQL8
-#include <ctype.h>
-#include <mysql/plugin.h>
-#endif
-
 #define CONFIG_FILE    _CONFIG_DIR"/proxy-auth.ini"
 #define SQL_FILE       _SQL_DIR"/proxy-auth.sql"
 
@@ -416,13 +408,15 @@ proxy_auth_handler = {
 	MYSQL_AUTHENTICATION_INTERFACE_VERSION,
 	"mysql_clear_password", // Cleartext plugin required in the client
 	proxy_auth_plugin_main,
+#if MYSQL_VERSION_ID >= 50700
 	generate_auth_string_hash,
 	validate_auth_string_hash,
 	set_salt,
 	AUTH_FLAG_PRIVILEGED_USER_FOR_PASSWORD_CHANGE,
-#ifdef MYSQL8
+#if MYSQL_VERSION_ID >= 80000
 	NULL
 #endif
+#endif
 };
 
 mysql_declare_plugin(proxy_auth) {
@@ -433,7 +427,7 @@ mysql_declare_plugin(proxy_auth) {
 	"Proxy user authentication server-side plugin",
 	PLUGIN_LICENSE_GPL,
 	proxy_auth_plugin_init,
-#ifdef MYSQL8
+#if MYSQL_VERSION_ID >= 80000
 	NULL,
 #endif
 	proxy_auth_plugin_deinit,