Build

- Enabled compiler warnings, which were off.  Yikes.
- Fixed all compiler warnings on OSX.

src/API.cpp

@@ -83,7 +83,7 @@ static int api_task_debug_message (lua_State* L)
 ////////////////////////////////////////////////////////////////////////////////
 // Causes the shell or interactive mode task to exit.  Ordinarily this does not
 // occur.
-static int api_task_exit (lua_State* L)
+static int api_task_exit (lua_State*)
 {
   // TODO Is this the correct exception?  How does the shell handle this?
   std::cout << "Exiting." << std::endl;
@@ -105,6 +105,8 @@ static int api_task_get (lua_State* L)
     // TODO Error!
     lua_pushstring (L, "");
   }
+
+  return 0;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -123,6 +125,8 @@ static int api_task_set (lua_State* L)
     // TODO Error!
     lua_pushstring (L, "");
   }
+
+  return 0;
 }
 
 ////////////////////////////////////////////////////////////////////////////////