avoid inducing link dependency on dfhack

library/Core.cpp

@@ -1471,6 +1471,10 @@ std::string Core::getHackPath()
 #endif
 }
 
+df::viewscreen * Core::getTopViewscreen() {
+    return getInstance().top_viewscreen;
+}
+
 bool Core::InitMainThread() {
     Filesystem::init();
 
@@ -1855,6 +1859,11 @@ void *Core::GetData( std::string key )
     }
 }
 
+Core& Core::getInstance() {
+    static Core instance;
+    return instance;
+}
+
 bool Core::isSuspended(void)
 {
     return ownerThread.load() == std::this_thread::get_id();

library/include/Core.h

@@ -125,11 +125,7 @@ namespace DFHack
         friend bool ::dfhooks_ncurses_key(int key);
     public:
         /// Get the single Core instance or make one.
-        static Core& getInstance()
-        {
-            static Core instance;
-            return instance;
-        }
+        static Core& getInstance();
         /// check if the activity lock is owned by this thread
         bool isSuspended(void);
         /// Is everything OK?
@@ -177,7 +173,7 @@ namespace DFHack
         bool isWorldLoaded() { return (last_world_data_ptr != NULL); }
         bool isMapLoaded() { return (last_local_map_ptr != NULL && last_world_data_ptr != NULL); }
 
-        static df::viewscreen *getTopViewscreen() { return getInstance().top_viewscreen; }
+        static df::viewscreen *getTopViewscreen();
 
         DFHack::Console &getConsole() { return con; }
 

library/modules/Gui.cpp

@@ -1709,7 +1709,7 @@ bool Gui::autoDFAnnouncement(df::report_init r, string message)
         if (a_flags.bits.D_DISPLAY)
         {
             world->status.display_timer = r.display_timer;
-            Gui::writeToGamelog("x" + to_string(repeat_count + 1));
+            Gui::writeToGamelog('x' + to_string(repeat_count + 1));
         }
         DEBUG(gui).print("Announcement succeeded as repeat:\n%s\n", message.c_str());
         return true;