auto-include plug.in, remove the need for plugins to modify configure.in

configure.in:
  plug.in examples

config/ac-macros/plugins.m4

@@ -249,7 +249,6 @@ AC_DEFUN([MYSQL_PLUGIN_ACTIONS],[
  ])
 ])
 
-
 dnl ---------------------------------------------------------------------------
 dnl Macro: MYSQL_CONFIGURE_PLUGINS
 dnl
@@ -267,6 +266,10 @@ AC_DEFUN([MYSQL_CONFIGURE_PLUGINS],[
    AC_FATAL([cannot use [MYSQL_CONFIGURE_PLUGINS] multiple times])
  ],[
    m4_define([__mysql_plugin_configured__],[done])
+   _MYSQL_INCLUDE_LIST(
+   m4_bpatsubst(m4_esyscmd([ls plugin/*/plug.in storage/*/plug.in 2>/dev/null]),
+[[ 
+]],[,]))
    m4_ifdef([__mysql_plugin_list__],[
     _MYSQL_CHECK_PLUGIN_ARGS([$1])
     _MYSQL_CONFIGURE_PLUGINS(m4_bpatsubst(__mysql_plugin_list__, :, [,]))
@@ -730,4 +733,21 @@ _MYSQL_EMIT_PLUGINS(m4_bpatsubst(__mysql_plugin_list__, :, [,]))
   _MYSQL_EMIT_PLUGIN_DEPENDS(m4_bpatsubst(__mysql_plugin_list__, :, [,]))
 ])
 
+dnl ---------------------------------------------------------------------------
+dnl Macro: _MYSQL_INCLUDE_LIST
+dnl
+dnl SYNOPSIS
+dnl   _MYSQL_INCLUDE_LIST([filename,filename...])
+dnl
+dnl DESCRIPTION
+dnl   includes all files from the list
+dnl
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([_MYSQL_INCLUDE_LIST],[
+ ifelse([$1], [], [], [
+  sinclude($1)
+  _MYSQL_INCLUDE_LIST(m4_shift($@))
+ ])
+])
+
 dnl ===========================================================================

configure.in

@@ -52,12 +52,6 @@ romanian russian serbian slovak spanish swedish ukrainian"
 # Declare our plugin modules
 #--------------------------------------------------------------------
 
-MYSQL_STORAGE_ENGINE(archive,,  [Archive Storage Engine],
-        [Archive Storage Engine], [max,max-no-ndb])
-MYSQL_PLUGIN_DIRECTORY(archive, [storage/archive])
-MYSQL_PLUGIN_STATIC(archive,    [libarchive.a])
-MYSQL_PLUGIN_DYNAMIC(archive,   [ha_archive.la])
-
 MYSQL_STORAGE_ENGINE(berkeley,  berkeley-db, [BerkeleyDB Storage Engine],
         [Transactional Tables using BerkeleyDB], [max,max-no-ndb])
 MYSQL_PLUGIN_DIRECTORY(berkeley,[storage/bdb])
@@ -76,12 +70,6 @@ MYSQL_PLUGIN_DIRECTORY(csv,     [storage/csv])
 MYSQL_PLUGIN_STATIC(csv,        [libcsv.a])
 MYSQL_PLUGIN_MANDATORY(csv)     dnl Used for logging
 
-MYSQL_STORAGE_ENGINE(example,,  [Example Storage Engine],
-        [Skeleton for Storage Engines for developers], [max,max-no-ndb])
-MYSQL_PLUGIN_DIRECTORY(example, [storage/example])
-MYSQL_PLUGIN_STATIC(example,    [libexample.a])
-MYSQL_PLUGIN_DYNAMIC(example,   [ha_example.la])
-
 MYSQL_STORAGE_ENGINE(federated,,[Federated Storage Engine],
         [Connects to tables on remote MySQL servers], [max,max-no-ndb])
 

storage/archive/plug.in

+MYSQL_STORAGE_ENGINE(archive,,  [Archive Storage Engine],
+        [Archive Storage Engine], [max,max-no-ndb])
+MYSQL_PLUGIN_DIRECTORY(archive, [storage/archive])
+MYSQL_PLUGIN_STATIC(archive,    [libarchive.a])
+MYSQL_PLUGIN_DYNAMIC(archive,   [ha_archive.la])

storage/example/plug.in

+MYSQL_STORAGE_ENGINE(example,,  [Example Storage Engine],
+        [Skeleton for Storage Engines for developers], [max,max-no-ndb])
+MYSQL_PLUGIN_DIRECTORY(example, [storage/example])
+MYSQL_PLUGIN_STATIC(example,    [libexample.a])
+MYSQL_PLUGIN_DYNAMIC(example,   [ha_example.la])