fix dialog plugin to work on windows

include/mysql/client_plugin.h

@@ -28,6 +28,16 @@
 #include <stdlib.h>
 #endif
 
+#if defined(_MSC_VER)
+  #ifdef __cplusplus
+    #define MYSQL_PLUGIN_EXPORT extern "C" __declspec(dllexport)
+  #else
+    #define MYSQL_PLUGIN_EXPORT __declspec(dllexport)
+  #endif
+#else /*_MSC_VER */
+#define MYSQL_PLUGIN_EXPORT
+#endif
+
 /* known plugin types */
 #define MYSQL_CLIENT_reserved1               0
 #define MYSQL_CLIENT_reserved2               1
@@ -38,6 +48,7 @@
 #define MYSQL_CLIENT_MAX_PLUGINS             3
 
 #define mysql_declare_client_plugin(X)          \
+     MYSQL_PLUGIN_EXPORT                        \
      struct st_mysql_client_plugin_ ## X        \
         _mysql_client_plugin_declaration_ = {   \
           MYSQL_CLIENT_ ## X ## _PLUGIN,        \

include/mysql/plugin_auth_common.h

@@ -14,6 +14,10 @@
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
 /**
   @file
 

plugin/auth/CMakeLists.txt

@@ -0,0 +1,3 @@
+INCLUDE("${PROJECT_SOURCE_DIR}/storage/mysql_storage_engine.cmake")
+SET(AUTH_SOURCES dialog.c)
+MYSQL_PLUGIN(AUTH)

plugin/auth/dialog.c

@@ -33,13 +33,16 @@
   a correct password. It shows the situation when a number of questions
   is not known in advance.
 */
-#define _GNU_SOURCE /* for RTLD_DEFAULT */
+#include <my_global.h>
+#include <mysql/client_plugin.h>
+#include <mysql.h>
+#include <string.h>
+
+#if defined (_WIN32)
+# define RTLD_DEFAULT GetModuleHandle(NULL)
+#endif
 
 #include <mysql/plugin_auth.h>
-#include <mysql/client_plugin.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
 
 /**
   first byte of the question string is the question "type".
@@ -51,8 +54,6 @@
 #define PASSWORD_QUESTION       "\4"
 #define LAST_PASSWORD           "\5"
 
-typedef unsigned char uchar;
-
 /********************* SERVER SIDE ****************************************/
 
 /**
@@ -216,9 +217,6 @@ maria_declare_plugin_end;
   dialog plugin will use it for communication with the user. Otherwise
   a default gets() based implementation will be used.
 */
-#include <mysql.h>
-#include <dlfcn.h>
-
 static mysql_authentication_dialog_ask_t ask;
 
 static char *builtin_ask(MYSQL *mysql __attribute__((unused)),