startup output cleanup

library/Core.cpp

@@ -1653,9 +1653,11 @@ bool Core::InitMainThread() {
     // to faciliate the linux symbol discovery process (which runs without any symbols)
     // or if --skip-size-check is discovered on the command line
 
-    if (df::global::global_table && df::global::game &&
-        df::global::game->command_line.original.find("--skip-size-check") == std::string::npos)
+    if (!df::global::global_table || !df::global::game ||
+        df::global::game->command_line.original.find("--skip-size-check") != std::string::npos)
     {
+        std::cerr << "Skipping structure size verification check." << std::endl;
+    } else {
         std::stringstream msg;
         bool gt_error = false;
         static const std::map<const std::string, const size_t> sizechecks{
@@ -1684,6 +1686,8 @@ bool Core::InitMainThread() {
             errorstate = true;
             return false;
         }
+
+        std::cerr << "Structure size verification check passed." << std::endl;
     }
 
     perf_counters.reset();

library/Hooks.cpp

@@ -11,19 +11,25 @@ DFhackCExport const int32_t dfhooks_priority = 100;
 // and the main event loop is initiated
 DFhackCExport void dfhooks_init() {
     if (getenv("DFHACK_DISABLE")) {
-        fprintf(stdout, "dfhack: DFHACK_DISABLE detected in environment; disabling\n");
+        fprintf(stderr, "dfhack: DFHACK_DISABLE detected in environment; disabling\n");
         disabled = true;
         return;
     }
 
     // we need to init DF globals before we can check the commandline
-    if (!DFHack::Core::getInstance().InitMainThread() || !df::global::game)
+    if (!DFHack::Core::getInstance().InitMainThread() || !df::global::game) {
+        disabled = true;
         return;
+    }
+
     const std::string & cmdline = df::global::game->command_line.original;
     if (cmdline.find("--disable-dfhack") != std::string::npos) {
-        fprintf(stdout, "dfhack: --disable-dfhack specified on commandline; disabling\n");
+        fprintf(stderr, "dfhack: --disable-dfhack specified on commandline; disabling\n");
         disabled = true;
+        return;
     }
+
+    fprintf(stderr, "DFHack pre-init successful.\n");
 }
 
 // called from the main thread after the main event loops exits

library/modules/DFSDL.cpp

@@ -22,16 +22,24 @@ using std::vector;
 static DFLibrary *g_sdl_handle = nullptr;
 static DFLibrary *g_sdl_image_handle = nullptr;
 static const vector<string> SDL_LIBS {
-    "SDL2.dll",
+#ifdef WIN32
+    "SDL2.dll"
+#elif defined(_DARWIN)
     "SDL.framework/Versions/A/SDL",
-    "SDL.framework/SDL",
+    "SDL.framework/SDL"
+#else
     "libSDL2-2.0.so.0"
+#endif
 };
 static const vector<string> SDL_IMAGE_LIBS {
-    "SDL2_image.dll",
+#ifdef WIN32
+    "SDL2_image.dll"
+#elif defined(_DARWIN)
     "SDL_image.framework/Versions/A/SDL_image",
-    "SDL_image.framework/SDL_image",
+    "SDL_image.framework/SDL_image"
+#else
     "libSDL2_image-2.0.so.0"
+#endif
 };
 
 SDL_Surface * (*g_IMG_Load)(const char *) = nullptr;

library/modules/DFSteam.cpp

@@ -19,9 +19,13 @@ static const int DFHACK_STEAM_APPID = 2346660;
 static bool g_steam_initialized = false;
 static DFLibrary* g_steam_handle = nullptr;
 static const std::vector<std::string> STEAM_LIBS {
-    "steam_api64.dll",
-    "libsteam_api.so",
+#ifdef WIN32
+    "steam_api64.dll"
+#elif defined(_DARWIN)
     "steam_api"  // TODO: validate this on OSX
+#else
+    "libsteam_api.so"
+#endif
 };
 
 bool (*g_SteamAPI_Init)() = nullptr;