Fixed some compiler warnings on Cygwin.

src/thread/win32/SDL_syssem.c

@@ -38,7 +38,7 @@ struct SDL_semaphore {
 #else
 	HANDLE id;
 #endif
-	Uint32 volatile count;
+	volatile LONG count;
 };
 
 
@@ -56,7 +56,7 @@ SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
 #else
 		sem->id = CreateSemaphore(NULL, initial_value, 32*1024, NULL);
 #endif
-		sem->count = initial_value;
+		sem->count = (LONG) initial_value;
 		if ( ! sem->id ) {
 			SDL_SetError("Couldn't create semaphore");
 			SDL_free(sem);
@@ -136,7 +136,7 @@ Uint32 SDL_SemValue(SDL_sem *sem)
 		SDL_SetError("Passed a NULL sem");
 		return 0;
 	}
-	return sem->count;
+	return (Uint32) sem->count;
 }
 
 int SDL_SemPost(SDL_sem *sem)

src/thread/win32/SDL_systhread.c

@@ -65,7 +65,7 @@ typedef struct ThreadStartParms
   pfnSDL_CurrentEndThread pfnCurrentEndThread;
 } tThreadStartParms, *pThreadStartParms;
 
-static unsigned __stdcall RunThread(void *data)
+static DWORD WINAPI RunThread(LPVOID *data)
 {
   pThreadStartParms pThreadParms = (pThreadStartParms)data;
   pfnSDL_CurrentEndThread pfnCurrentEndThread = NULL;
@@ -99,7 +99,7 @@ int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
 	pfnSDL_CurrentEndThread pfnEndThread = _endthreadex;
 #endif
 #endif /* SDL_PASSED_BEGINTHREAD_ENDTHREAD */
-	unsigned threadid;
+	DWORD threadid = 0;
 	pThreadStartParms pThreadParms = (pThreadStartParms)SDL_malloc(sizeof(tThreadStartParms));
 	if (!pThreadParms) {
 		SDL_OutOfMemory();
@@ -112,8 +112,9 @@ int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
 	pThreadParms->args = args;
 
 	if (pfnBeginThread) {
-		thread->handle = (SYS_ThreadHandle) pfnBeginThread(NULL, 0, RunThread,
-				pThreadParms, 0, &threadid);
+		thread->handle = (SYS_ThreadHandle)
+				((size_t) pfnBeginThread(NULL, 0, RunThread,
+										 pThreadParms, 0, &threadid));
 	} else {
 		thread->handle = CreateThread(NULL, 0, RunThread, pThreadParms, 0, &threadid);
 	}

src/video/windib/SDL_dibevents.c

@@ -655,7 +655,7 @@ int DIB_CreateWindow(_THIS)
 		SDL_Window = (HWND)wcstol(windowid_t, NULL, 0);
 		SDL_free(windowid_t);
 #else
-		SDL_Window = (HWND)SDL_strtoull(windowid, NULL, 0);
+		SDL_Window = (HWND)((size_t)SDL_strtoull(windowid, NULL, 0));
 #endif
 		if ( SDL_Window == NULL ) {
 			SDL_SetError("Couldn't get user specified window");