Restore ai/registry.hpp

Because obviously calling an empty function is essential for AI to work
correctly in GCC/Clang builds. #logic

projectfiles/VC12/wesnoth.vcxproj

@@ -3564,6 +3564,7 @@
     <ClInclude Include="..\..\src\ai\lua\engine_lua.hpp" />
     <ClInclude Include="..\..\src\ai\lua\lua_object.hpp" />
     <ClInclude Include="..\..\src\ai\manager.hpp" />
+    <ClInclude Include="..\..\src\ai\registry.hpp" />
     <ClInclude Include="..\..\src\ai\simulated_actions.hpp" />
     <ClInclude Include="..\..\src\ai\testing.hpp" />
     <ClInclude Include="..\..\src\animated.hpp" />

projectfiles/VC12/wesnoth.vcxproj.filters

@@ -1596,6 +1596,9 @@
     <ClInclude Include="..\..\src\ai\manager.hpp">
       <Filter>AI</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\ai\registry.hpp">
+      <Filter>AI</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\src\ai\simulated_actions.hpp">
       <Filter>AI</Filter>
     </ClInclude>

src/ai/manager.cpp

@@ -37,6 +37,7 @@
 #include "ai/game_info.hpp"             // for side_number, engine_ptr, etc
 #include "game_config.hpp"              // for debug
 #include "ai/lua/aspect_advancements.hpp"
+#include "ai/registry.hpp"              // for init
 
 #include <algorithm>                    // for min
 #include <cassert>                     // for assert
@@ -315,6 +316,7 @@ manager::manager()
 	, last_interact_(0)
 	, num_interact_(0)
 {
+	registry::init();
 	singleton_ = this;
 }
 

src/ai/registry.cpp

@@ -17,6 +17,8 @@
  * @file
  */
 
+#include "ai/registry.hpp"
+
 #include "config.hpp"             // for config, operator<<
 #include "terrain/filter.hpp"  // for terrain_filter
 #include "ai/composite/engine.hpp"      // for register_engine_factory
@@ -475,4 +477,8 @@ static register_aspect_factory< default_recruitment::recruitment_aspect >
 static register_aspect_factory< default_recruitment::recruitment_aspect >
 	recruitment__standard_aspect_factory2("recruitment*");
 
+void registry::init()
+{
+}
+
 } //end of namespace ai

src/ai/registry.hpp

@@ -0,0 +1,28 @@
+/*
+   Copyright (C) 2009 - 2018 by Yurii Chernyi <terraninfo@terraninfo.net>
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   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
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+
+/**
+ * @file
+ * All known AI parts
+ */
+
+#pragma once
+
+namespace ai {
+namespace registry {
+
+void init();
+
+}
+} //end of namespace ai