* frame.h (struct frame): Drop has_minibuffer member because...

(FRAME_HAS_MINIBUF_P): ...this macro can be implemented without it.
* frame.c (make_frame, make_minibuffer_frame): Adjust users.

src/ChangeLog

+2013-10-02  Dmitry Antipov  <dmantipov@yandex.ru>
+
+	* frame.h (struct frame): Drop has_minibuffer member because...
+	(FRAME_HAS_MINIBUF_P): ...this macro can be implemented without it.
+	* frame.c (make_frame, make_minibuffer_frame): Adjust users.
+
 2013-10-02  Dmitry Antipov  <dmantipov@yandex.ru>
 
 	* window.h (struct window): Prefer enum text_cursor_kinds to int

src/frame.c

@@ -339,7 +339,6 @@ make_frame (bool mini_p)
      initialize enum members explicitly even if their values are zero.  */
   f->wants_modeline = 1;
   f->garbaged = 1;
-  f->has_minibuffer = mini_p;
   f->vertical_scroll_bar_type = vertical_scroll_bar_none;
   f->column_width = 1;  /* !FRAME_WINDOW_P value */
   f->line_height = 1;  /* !FRAME_WINDOW_P value */
@@ -489,7 +488,6 @@ make_minibuffer_frame (void)
   f->auto_lower = 0;
   f->no_split = 1;
   f->wants_modeline = 0;
-  f->has_minibuffer = 1;
 
   /* Now label the root window as also being the minibuffer.
      Avoid infinite looping on the window chain by marking next pointer

src/frame.h

@@ -355,10 +355,6 @@ struct frame
   /* Nonzero if this frame should be redrawn.  */
   unsigned garbaged : 1;
 
-  /* True if frame actually has a minibuffer window on it.
-     0 if using a minibuffer window that isn't on this frame.  */
-  unsigned has_minibuffer : 1;
-
   /* 0 means, if this frame has just one window,
      show no modeline for that window.  */
   unsigned wants_modeline : 1;
@@ -657,9 +653,11 @@ default_pixels_per_inch_y (void)
 #define FRAME_MINIBUF_ONLY_P(f) \
   EQ (FRAME_ROOT_WINDOW (f), FRAME_MINIBUF_WINDOW (f))
 
-/* Nonzero if frame F contains a minibuffer window.
-   (If this is 0, F must use some other minibuffer window.)  */
-#define FRAME_HAS_MINIBUF_P(f) ((f)->has_minibuffer)
+/* Nonzero if frame F contains it's own minibuffer window.  Frame always has
+   minibuffer window, but it could use minibuffer window of another frame.  */
+#define FRAME_HAS_MINIBUF_P(f)					\
+  (WINDOWP (f->minibuffer_window)				\
+   && XFRAME (XWINDOW (f->minibuffer_window)->frame) == f)
 
 /* Pixel height of frame F, including non-toolkit menu bar and
    non-toolkit tool bar lines.  */