Avoid a few compilation warnings in Objective-C code.

* src/nsfns.m (Fns_frame_restack): Remove unused variable 'flag'.

* src/nsmenu.m (ns_update_menubar): Remove unused variable 'pool'.

* src/nsterm.m (focus_view, hide_bell): Define conditionally.
(ns_update_end): Define variable 'view' conditionally.
(ns_redraw_scroll_bars): Don't define unused function.
(copyRect): Don't perform arithmetic on 'void' pointers.
(nswindow_orderedIndex_sort): Make static.

src/nsfns.m

@@ -1487,7 +1487,6 @@ Frames are listed from topmost (first) to bottommost (last).  */)
     {
       EmacsWindow *window = (EmacsWindow *)[FRAME_NS_VIEW (f1) window];
       NSWindow *window2 = [FRAME_NS_VIEW (f2) window];
-      BOOL flag = !NILP (above);
 
       if ([window restackWindow:window2 above:!NILP (above)])
         return Qt;

src/nsmenu.m

@@ -101,7 +101,6 @@
 static void
 ns_update_menubar (struct frame *f, bool deep_p)
 {
-  NSAutoreleasePool *pool;
   BOOL needsSet = NO;
   id menu = [NSApp mainMenu];
   bool owfi;

src/nsterm.m

@@ -272,7 +272,9 @@ - (NSColor *)colorUsingDefaultColorSpace
 
 /* display update */
 static struct frame *ns_updating_frame;
+#if !defined (NS_DRAW_TO_BUFFER) || MAC_OS_X_VERSION_MIN_REQUIRED < 101400
 static NSView *focus_view = NULL;
+#endif
 static int ns_window_num = 0;
 static BOOL gsaved = NO;
 static BOOL ns_fake_keydown = NO;
@@ -1139,7 +1141,9 @@ static NSRect constrain_frame_rect(NSRect frameRect, bool isFullscreen)
    external (RIF) call; for whole frame, called after gui_update_window_end
    -------------------------------------------------------------------------- */
 {
+#if !defined (NS_DRAW_TO_BUFFER) || MAC_OS_X_VERSION_MIN_REQUIRED < 101400
   EmacsView *view = FRAME_NS_VIEW (f);
+#endif
 
   NSTRACE_WHEN (NSTRACE_GROUP_UPDATES, "ns_update_end");
 
@@ -1449,7 +1453,7 @@ -(void)remove
     }
 }
 
-
+#if !defined (NS_DRAW_TO_BUFFER) || MAC_OS_X_VERSION_MIN_REQUIRED < 101400
 static void
 hide_bell (void)
 /* --------------------------------------------------------------------------
@@ -1463,6 +1467,7 @@ -(void)remove
       [bell_view remove];
     }
 }
+#endif
 
 
 /* ==========================================================================
@@ -2876,6 +2881,8 @@ so some key presses (TAB) are swallowed by the system.  */
    ========================================================================== */
 
 
+#if 0
+/* FIXME: Remove this function. */
 static void
 ns_redraw_scroll_bars (struct frame *f)
 {
@@ -2890,6 +2897,7 @@ so some key presses (TAB) are swallowed by the system.  */
       [view display];
     }
 }
+#endif
 
 
 void
@@ -8399,21 +8407,23 @@ - (void)copyRect:(NSRect)srcRect to:(NSRect)dstRect
       void *pixels = CGBitmapContextGetData (context);
       int rowSize = CGBitmapContextGetBytesPerRow (context);
       int srcRowSize = NSWidth (srcRect) * scale * bpp;
-      void *srcPixels = pixels + (int)(NSMinY (srcRect) * scale * rowSize
-                                       + NSMinX (srcRect) * scale * bpp);
-      void *dstPixels = pixels + (int)(NSMinY (dstRect) * scale * rowSize
-                                       + NSMinX (dstRect) * scale * bpp);
+      void *srcPixels = (char *) pixels
+                        + (int) (NSMinY (srcRect) * scale * rowSize
+                                 + NSMinX (srcRect) * scale * bpp);
+      void *dstPixels = (char *) pixels
+                        + (int) (NSMinY (dstRect) * scale * rowSize
+                                 + NSMinX (dstRect) * scale * bpp);
 
       if (NSIntersectsRect (srcRect, dstRect)
           && NSMinY (srcRect) < NSMinY (dstRect))
         for (int y = NSHeight (srcRect) * scale - 1 ; y >= 0 ; y--)
-          memmove (dstPixels + y * rowSize,
-                   srcPixels + y * rowSize,
+          memmove ((char *) dstPixels + y * rowSize,
+                   (char *) srcPixels + y * rowSize,
                    srcRowSize);
       else
         for (int y = 0 ; y < NSHeight (srcRect) * scale ; y++)
-          memmove (dstPixels + y * rowSize,
-                   srcPixels + y * rowSize,
+          memmove ((char *) dstPixels + y * rowSize,
+                   (char *) srcPixels + y * rowSize,
                    srcRowSize);
 
 #if MAC_OS_X_VERSION_MIN_REQUIRED < 101400
@@ -8742,7 +8752,8 @@ - (void)makeKeyAndOrderFront:(id)sender
 /* The array returned by [NSWindow parentWindow] may already be
    sorted, but the documentation doesn't tell us whether or not it is,
    so to be safe we'll sort it.  */
-NSInteger nswindow_orderedIndex_sort (id w1, id w2, void *c)
+static NSInteger
+nswindow_orderedIndex_sort (id w1, id w2, void *c)
 {
   NSInteger i1 = [w1 orderedIndex];
   NSInteger i2 = [w2 orderedIndex];