* configure.in: Add glyphs category to --enable-checking option.

(GLYPH_DEBUG): Define if glyphs debugging is enabled.
* src/dispextern.h (GLYPH_DEBUG): Now defined in config.h if
enabled with --enable-checking=[all,glyphs] configure option.
Fix GLYPH_DEBUG usage assuming that it may be undefined,
adjust comments accordingly.
* src/dispnew.c: Fix GLYPH_DEBUG usage assuming that it may be
undefined, adjust comments accordingly.
* src/image.c: Likewise.
* src/scroll.c: Likewise.
* src/w32fns.c: Likewise.
* src/w32term.c: Likewise.
* src/xdisp.c: Likewise.
* src/xfaces.c: Likewise.
* src/xfns.c: Likewise.
* src/xterm.c: Likewise.

12 files changed, 111 insertions, 104 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 9a677d9f2d7..fd1f17b8cde 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,22 @@
 2012-06-28  Dmitry Antipov  <dmantipov@yandex.ru>
 
+        * dispextern.h (GLYPH_DEBUG): Now defined in config.h if
+        enabled with --enable-checking=[all,glyphs] configure option.
+        Fix GLYPH_DEBUG usage assuming that it may be undefined,
+        adjust comments accordingly.
+        * dispnew.c: Fix GLYPH_DEBUG usage assuming that it may be
+        undefined, adjust comments accordingly.
+        * image.c: Likewise.
+        * scroll.c: Likewise.
+        * w32fns.c: Likewise.
+        * w32term.c: Likewise.
+        * xdisp.c: Likewise.
+        * xfaces.c: Likewise.
+        * xfns.c: Likewise.
+        * xterm.c: Likewise.
+
+2012-06-28  Dmitry Antipov  <dmantipov@yandex.ru>
+
         Generalize run-time debugging checks.
         * dispextern.h (XASSERTS): Remove.
         * fontset.c (xassert): Remove.
diff --git a/src/dispextern.h b/src/dispextern.h
index 78f6db63cb7..c7adc4dadec 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -121,26 +121,21 @@ enum window_part
                               Debugging
  ***********************************************************************/
 
-/* If GLYPH_DEBUG is non-zero, additional checks are activated.  Turn
-   it off by defining the macro GLYPH_DEBUG to zero.  */
+/* If GLYPH_DEBUG is defined, additional checks are activated.  */
 
-#ifndef GLYPH_DEBUG
-#define GLYPH_DEBUG 0
-#endif
-
-/* Macros to include code only if GLYPH_DEBUG != 0.  */
+/* Macros to include code only if GLYPH_DEBUG is defined.  */
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 #define IF_DEBUG(X)     X
 #else
 #define IF_DEBUG(X)     (void) 0
 #endif
 
 /* Macro for displaying traces of redisplay.  If Emacs was compiled
-   with GLYPH_DEBUG != 0, the variable trace_redisplay_p can be set to
+   with GLYPH_DEBUG defined, the variable trace_redisplay_p can be set to
    a non-zero value in debugging sessions to activate traces.  */
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 extern int trace_redisplay_p EXTERNALLY_VISIBLE;
 #include <stdio.h>
@@ -151,11 +146,11 @@ extern int trace_redisplay_p EXTERNALLY_VISIBLE;
      else                                       \
        (void) 0
 
-#else /* GLYPH_DEBUG == 0 */
+#else /* not GLYPH_DEBUG */
 
 #define TRACE(X)        (void) 0
 
-#endif /* GLYPH_DEBUG == 0 */
+#endif /* GLYPH_DEBUG */
 
 
 
@@ -653,7 +648,7 @@ struct glyph_matrix
      line.  */
   unsigned header_line_p : 1;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   /* A string identifying the method used to display the matrix.  */
   char method[512];
 #endif
@@ -671,7 +666,7 @@ struct glyph_matrix
 /* Check that glyph pointers stored in glyph rows of MATRIX are okay.
    This aborts if any pointer is found twice.  */
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 void check_matrix_pointer_lossage (struct glyph_matrix *);
 #define CHECK_MATRIX(MATRIX) check_matrix_pointer_lossage ((MATRIX))
 #else
@@ -950,10 +945,10 @@ struct glyph_row
 
 
 /* Get a pointer to row number ROW in matrix MATRIX.  If GLYPH_DEBUG
-   is defined to a non-zero value, the function matrix_row checks that
-   we don't try to access rows that are out of bounds.  */
+   is defined, the function matrix_row checks that we don't try to
+   access rows that are out of bounds.  */
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 struct glyph_row *matrix_row (struct glyph_matrix *, int);
 #define MATRIX_ROW(MATRIX, ROW)   matrix_row ((MATRIX), (ROW))
 #else
@@ -3067,7 +3062,7 @@ extern void produce_stretch_glyph (struct it *);
 
 #ifdef HAVE_WINDOW_SYSTEM
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 extern void dump_glyph_string (struct glyph_string *) EXTERNALLY_VISIBLE;
 #endif
 
diff --git a/src/dispnew.c b/src/dispnew.c
index a34552fc564..767f1c8112b 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -123,7 +123,7 @@ static void fill_up_glyph_row_area_with_spaces (struct glyph_row *, int);
 static int scrolling_window (struct window *, int);
 static int update_window_line (struct window *, int, int *);
 static void mirror_make_current (struct window *, int);
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 static void check_matrix_pointers (struct glyph_matrix *,
                                    struct glyph_matrix *);
 #endif
@@ -211,7 +211,7 @@ int fonts_changed_p;
 /* Convert vpos and hpos from frame to window and vice versa.
    This may only be used for terminal frames.  */
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 static int window_to_frame_vpos (struct window *, int);
 static int window_to_frame_hpos (struct window *, int);
@@ -311,12 +311,12 @@ DEFUN ("dump-redisplay-history", Fdump_redisplay_history,
 }
 
 
-#else /* GLYPH_DEBUG == 0 */
+#else /* not GLYPH_DEBUG */
 
 #define WINDOW_TO_FRAME_VPOS(W, VPOS) ((VPOS) + WINDOW_TOP_EDGE_LINE (W))
 #define WINDOW_TO_FRAME_HPOS(W, HPOS) ((HPOS) + WINDOW_LEFT_EDGE_COL (W))
 
-#endif /* GLYPH_DEBUG == 0 */
+#endif /* GLYPH_DEBUG */
 
 
 #if (defined PROFILING \
@@ -419,14 +419,14 @@ margin_glyphs_to_reserve (struct window *w, int total_glyphs, Lisp_Object margin
   return n;
 }
 
-#ifdef ENABLE_CHECKING
-/* Return non-zero if ROW's hash value is correct, zero if not.  */
+/* Return non-zero if ROW's hash value is correct, zero if not.
+   Optimized away if ENABLE_CHECKING is not defined.  */
+
 static int
 verify_row_hash (struct glyph_row *row)
 {
   return row->hash == row_hash (row);
 }
-#endif
 
 /* Adjust glyph matrix MATRIX on window W or on a frame to changed
    window sizes.
@@ -1136,7 +1136,7 @@ assign_row (struct glyph_row *to, struct glyph_row *from)
    is non-zero if the glyph memory of WINDOW_ROW is part of the glyph
    memory of FRAME_ROW.  */
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 static int
 glyph_row_slice_p (struct glyph_row *window_row, struct glyph_row *frame_row)
@@ -1451,7 +1451,7 @@ realloc_glyph_pool (struct glyph_pool *pool, struct dim matrix_dim)
                               Debug Code
  ***********************************************************************/
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 
 /* Flush standard output.  This is sometimes useful to call from the debugger.
@@ -1576,7 +1576,7 @@ check_matrix_invariants (struct window *w)
 
 #endif /* 0  */
 
-#endif /* GLYPH_DEBUG != 0 */
+#endif /* GLYPH_DEBUG */
 
 
 
@@ -2599,7 +2599,7 @@ build_frame_matrix_from_leaf_window (struct glyph_matrix *frame_matrix, struct w
               SET_CHAR_GLYPH_FROM_GLYPH (*border, right_border_glyph);
             }
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
           /* Window row window_y must be a slice of frame row
              frame_y.  */
           eassert (glyph_row_slice_p (window_row, frame_row));
@@ -3026,7 +3026,7 @@ mirror_line_dance (struct window *w, int unchanged_at_top, int nlines, int *copy
 }
 
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 /* Check that window and frame matrices agree about their
    understanding where glyphs of the rows are to find.  For each
@@ -3082,7 +3082,7 @@ check_matrix_pointers (struct glyph_matrix *window_matrix,
     }
 }
 
-#endif /* GLYPH_DEBUG != 0 */
+#endif /* GLYPH_DEBUG */
 
 
 
@@ -3090,7 +3090,7 @@ check_matrix_pointers (struct glyph_matrix *window_matrix,
                       VPOS and HPOS translations
  **********************************************************************/
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 /* Translate vertical position VPOS which is relative to window W to a
    vertical position relative to W's frame.  */
@@ -3302,7 +3302,7 @@ update_frame (struct frame *f, int force_p, int inhibit_hairy_id_p)
         }
 
       /* Check window matrices for lost pointers.  */
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       check_window_matrix_pointers (root_window);
       add_frame_display_history (f, paused_p);
 #endif
@@ -3529,7 +3529,7 @@ update_window (struct window *w, int force_p)
   int preempt_count = baud_rate / 2400 + 1;
 #endif
   struct redisplay_interface *rif = FRAME_RIF (XFRAME (WINDOW_FRAME (w)));
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   /* Check that W's frame doesn't have glyph matrices.  */
   eassert (FRAME_WINDOW_P (XFRAME (WINDOW_FRAME (w))));
 #endif
@@ -3681,7 +3681,7 @@ update_window (struct window *w, int force_p)
 #endif
         }
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       /* Remember the redisplay method used to display the matrix.  */
       strcpy (w->current_matrix->method, w->desired_matrix->method);
 #endif
@@ -3699,7 +3699,7 @@ update_window (struct window *w, int force_p)
   else
     paused_p = 1;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   /* check_current_matrix_flags (w); */
   add_window_display_history (w, w->current_matrix->method, paused_p);
 #endif
@@ -6476,7 +6476,7 @@ syms_of_display (void)
   defsubr (&Sinternal_show_cursor_p);
   defsubr (&Slast_nonminibuf_frame);
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   defsubr (&Sdump_redisplay_history);
 #endif
 
diff --git a/src/fontset.c b/src/fontset.c
index 98ee89070f9..da54bca2a5c 100644
--- a/src/fontset.c
+++ b/src/fontset.c
@@ -197,9 +197,8 @@ static void accumulate_script_ranges (Lisp_Object, Lisp_Object,
                                       Lisp_Object);
 static void set_fontset_font (Lisp_Object, Lisp_Object);
 
-#ifdef ENABLE_CHECKING
-
-/* Return 1 if ID is a valid fontset id, else return 0.  */
+/* Return 1 if ID is a valid fontset id, else return 0.
+   Optimized away if ENABLE_CHECKING is not defined.  */
 
 static int
 fontset_id_valid_p (int id)
@@ -207,8 +206,6 @@ fontset_id_valid_p (int id)
   return (id >= 0 && id < ASIZE (Vfontset_table) - 1);
 }
 
-#endif
-
 
 
 /********** MACROS AND FUNCTIONS TO HANDLE FONTSET **********/
diff --git a/src/image.c b/src/image.c
index 63bac9a8a79..9b1c7f1b280 100644
--- a/src/image.c
+++ b/src/image.c
@@ -8686,7 +8686,7 @@ x_kill_gs_process (Pixmap pixmap, struct frame *f)
                                 Tests
  ***********************************************************************/
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 DEFUN ("imagep", Fimagep, Simagep, 1, 1, 0,
        doc: /* Value is non-nil if SPEC is a valid image specification.  */)
@@ -8708,7 +8708,7 @@ DEFUN ("lookup-image", Flookup_image, Slookup_image, 1, 1, 0, "")
   return make_number (id);
 }
 
-#endif /* GLYPH_DEBUG != 0 */
+#endif /* GLYPH_DEBUG */
 
 
 /***********************************************************************
@@ -8922,7 +8922,7 @@ non-numeric, there is no explicit limit on the size of images.  */);
   defsubr (&Simage_mask_p);
   defsubr (&Simage_metadata);
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   defsubr (&Simagep);
   defsubr (&Slookup_image);
 #endif
diff --git a/src/scroll.c b/src/scroll.c
index 603e04575f6..86d775545b0 100644
--- a/src/scroll.c
+++ b/src/scroll.c
@@ -264,7 +264,7 @@ do_scrolling (struct frame *frame, struct glyph_matrix *current_matrix,
   for (k = 0; k < window_size; ++k)
     copy_from[k] = -1;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 # define CHECK_BOUNDS                                                   \
   do                                                                    \
     {                                                                   \
@@ -322,7 +322,7 @@ do_scrolling (struct frame *frame, struct glyph_matrix *current_matrix,
           copy_from[i] = j;
           retained_p[j] = 1;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
           CHECK_BOUNDS;
 #endif
         }
@@ -374,7 +374,7 @@ do_scrolling (struct frame *frame, struct glyph_matrix *current_matrix,
   mirrored_line_dance (current_matrix, unchanged_at_top, window_size,
                        copy_from, retained_p);
 
-  /* Some sanity checks if GLYPH_DEBUG != 0.  */
+  /* Some sanity checks if GLYPH_DEBUG is defined.  */
   CHECK_MATRIX (current_matrix);
 
   if (terminal_window_p)
diff --git a/src/w32fns.c b/src/w32fns.c
index c00ed66dcbb..acd42792b9b 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -183,7 +183,7 @@ unsigned int msh_mousewheel = 0;
 #define MENU_FREE_DELAY 1000
 static unsigned menu_free_timer = 0;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 static int image_cache_refcount, dpyinfo_refcount;
 #endif
 
@@ -3996,14 +3996,14 @@ unwind_create_frame (Lisp_Object frame)
   /* If frame is ``official'', nothing to do.  */
   if (NILP (Fmemq (frame, Vframe_list)))
     {
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       struct w32_display_info *dpyinfo = FRAME_W32_DISPLAY_INFO (f);
 #endif
 
       x_free_frame_resources (f);
       free_glyphs (f);
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       /* Check that reference counts are indeed correct.  */
       eassert (dpyinfo->reference_count == dpyinfo_refcount);
       eassert (dpyinfo->terminal->image_cache->refcount == image_cache_refcount);
@@ -4160,7 +4160,7 @@ This function is an internal primitive--use `make-frame' instead.  */)
 
   /* With FRAME_X_DISPLAY_INFO set up, this unwind-protect is safe.  */
   record_unwind_protect (unwind_create_frame, frame);
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   image_cache_refcount =
     FRAME_IMAGE_CACHE (f) ? FRAME_IMAGE_CACHE (f)->refcount : 0;
   dpyinfo_refcount = dpyinfo->reference_count;
@@ -5237,7 +5237,7 @@ x_create_tip_frame (struct w32_display_info *dpyinfo,
   FRAME_FONTSET (f)  = -1;
   f->icon_name = Qnil;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   image_cache_refcount =
     FRAME_IMAGE_CACHE (f) ? FRAME_IMAGE_CACHE (f)->refcount : 0;
   dpyinfo_refcount = dpyinfo->reference_count;
diff --git a/src/w32term.c b/src/w32term.c
index f879e648054..c0c137b9a9d 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -231,7 +231,7 @@ static void my_set_focus (struct frame *, HWND);
 static void my_set_foreground_window (HWND);
 static void my_destroy_window (struct frame *, HWND);
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 static void x_check_font (struct frame *, struct font *);
 #endif
 
@@ -6024,7 +6024,7 @@ x_wm_set_icon_position (struct frame *f, int icon_x, int icon_y)
                                 Fonts
  ***********************************************************************/
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 /* Check that FONT is valid on frame F.  It is if it can be found in F's
    font table.  */
@@ -6037,7 +6037,7 @@ x_check_font (struct frame *f, struct font *font)
     eassert (font->driver->check (f, font) == 0);
 }
 
-#endif /* GLYPH_DEBUG != 0 */
+#endif /* GLYPH_DEBUG */
 
 
 
diff --git a/src/xdisp.c b/src/xdisp.c
index b03c455eb50..425ccc522de 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -627,10 +627,10 @@ int current_mode_line_height, current_header_line_height;
     CACHE = NULL;                               \
   } while (0)
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 /* Non-zero means print traces of redisplay if compiled with
-   GLYPH_DEBUG != 0.  */
+   GLYPH_DEBUG defined.  */
 
 int trace_redisplay_p;
 
@@ -2495,7 +2495,7 @@ check_it (struct it *it)
 #endif /* not 0 */
 
 
-#if GLYPH_DEBUG && defined ENABLE_CHECKING
+#if defined GLYPH_DEBUG && defined ENABLE_CHECKING
 
 /* Check that the window end of window W is what we expect it
    to be---the last row in the current matrix displaying text.  */
@@ -2521,7 +2521,7 @@ check_window_end (struct window *w)
 
 #define CHECK_WINDOW_END(W)     (void) 0
 
-#endif
+#endif /* GLYPH_DEBUG and ENABLE_CHECKING */
 
 
 
@@ -12435,7 +12435,7 @@ hscroll_windows (Lisp_Object window)
    to a non-zero value.  This is sometimes handy to have in a debugger
    session.  */
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 /* First and last unchanged row for try_window_id.  */
 
@@ -13235,7 +13235,7 @@ redisplay_internal (void)
               /* Update hint: No need to try to scroll in update_window.  */
               w->desired_matrix->no_scrolling_p = 1;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
               *w->desired_matrix->method = 0;
               debug_method_add (w, "optimization 1");
 #endif
@@ -13303,7 +13303,7 @@ redisplay_internal (void)
               eassert (this_line_vpos == it.vpos);
               eassert (this_line_y == it.current_y);
               set_cursor_from_row (w, row, w->current_matrix, 0, 0, 0, 0);
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
               *w->desired_matrix->method = 0;
               debug_method_add (w, "optimization 3");
 #endif
@@ -14575,7 +14575,7 @@ try_scrolling (Lisp_Object window, int just_this_one_p,
   /* We will never try scrolling more than this number of lines.  */
   int scroll_limit = SCROLL_LIMIT;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   debug_method_add (w, "try_scrolling");
 #endif
 
@@ -14927,7 +14927,7 @@ try_cursor_movement (Lisp_Object window, struct text_pos startp, int *scroll_ste
   struct frame *f = XFRAME (w->frame);
   int rc = CURSOR_MOVEMENT_CANNOT_BE_USED;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   if (inhibit_try_cursor_movement)
     return rc;
 #endif
@@ -14974,7 +14974,7 @@ try_cursor_movement (Lisp_Object window, struct text_pos startp, int *scroll_ste
       int this_scroll_margin, top_scroll_margin;
       struct glyph_row *row = NULL;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       debug_method_add (w, "cursor movement");
 #endif
 
@@ -15332,7 +15332,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
 
   /* W must be a leaf window here.  */
   eassert (!NILP (w->buffer));
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   *w->desired_matrix->method = 0;
 #endif
 
@@ -15624,7 +15624,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
             }
         }
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       debug_method_add (w, "forced window start");
 #endif
       goto done;
@@ -15656,7 +15656,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
            && !(CHARPOS (startp) <= BEGV
                 || FETCH_BYTE (BYTEPOS (startp) - 1) == '\n'))
     {
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       debug_method_add (w, "recenter 1");
 #endif
       goto recenter;
@@ -15667,7 +15667,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
      not work.  It is 0 if unsuccessful for some other reason.  */
   else if ((tem = try_window_id (w)) != 0)
     {
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       debug_method_add (w, "try_window_id %d", tem);
 #endif
 
@@ -15724,7 +15724,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
           goto force_start;
         }
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       debug_method_add (w, "same window start");
 #endif
 
@@ -15819,7 +15819,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
 
  recenter:
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   debug_method_add (w, "recenter");
 #endif
 
@@ -16307,7 +16307,7 @@ try_window_reusing_current_matrix (struct window *w)
   struct glyph_row *start_row;
   int start_vpos, min_y, max_y;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   if (inhibit_try_window_reusing)
     return 0;
 #endif
@@ -16529,7 +16529,7 @@ try_window_reusing_current_matrix (struct window *w)
       /* Update hint: don't try scrolling again in update_window.  */
       w->desired_matrix->no_scrolling_p = 1;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       debug_method_add (w, "try_window_reusing_current_matrix 1");
 #endif
       return 1;
@@ -16719,7 +16719,7 @@ try_window_reusing_current_matrix (struct window *w)
       w->window_end_valid = Qnil;
       w->desired_matrix->no_scrolling_p = 1;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       debug_method_add (w, "try_window_reusing_current_matrix 2");
 #endif
       return 1;
@@ -17087,7 +17087,7 @@ try_window_id (struct window *w)
   struct text_pos start;
   ptrdiff_t first_changed_charpos, last_changed_charpos;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   if (inhibit_try_window_id)
     return 0;
 #endif
@@ -17421,7 +17421,7 @@ try_window_id (struct window *w)
     GIVE_UP (19);
 
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
   /* Either there is no unchanged row at the end, or the one we have
      now displays text.  This is a necessary condition for the window
@@ -17435,7 +17435,7 @@ try_window_id (struct window *w)
        : -1);
   debug_first_unchanged_at_end_vpos = first_unchanged_at_end_vpos;
 
-#endif /* GLYPH_DEBUG != 0 */
+#endif /* GLYPH_DEBUG */
 
 
   /* Display new lines.  Set last_text_row to the last new line
@@ -17805,7 +17805,7 @@ try_window_id (struct window *w)
                         More debugging support
  ***********************************************************************/
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 void dump_glyph_row (struct glyph_row *, int, int) EXTERNALLY_VISIBLE;
 void dump_glyph_matrix (struct glyph_matrix *, int) EXTERNALLY_VISIBLE;
@@ -22223,7 +22223,7 @@ calc_pixel_width_or_height (double *res, struct it *it, Lisp_Object prop,
 
 #ifdef HAVE_WINDOW_SYSTEM
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 void
 dump_glyph_string (struct glyph_string *s)
@@ -28408,7 +28408,7 @@ syms_of_xdisp (void)
   message_dolog_marker3 = Fmake_marker ();
   staticpro (&message_dolog_marker3);
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   defsubr (&Sdump_frame_glyph_matrix);
   defsubr (&Sdump_glyph_matrix);
   defsubr (&Sdump_glyph_row);
@@ -28620,7 +28620,7 @@ of the top or bottom of the window.  */);
 Value is a number or a cons (WIDTH-DPI . HEIGHT-DPI).  */);
   Vdisplay_pixels_per_inch = make_float (72.0);
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   DEFVAR_INT ("debug-end-pos", debug_end_pos, doc: /* Don't ask.  */);
 #endif
 
@@ -28937,7 +28937,7 @@ To add a prefix to continuation lines, use `wrap-prefix'.  */);
     doc: /* Non-nil means don't free realized faces.  Internal use only.  */);
   inhibit_free_realized_faces = 0;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   DEFVAR_BOOL ("inhibit-try-window-id", inhibit_try_window_id,
                doc: /* Inhibit try_window_id display optimization.  */);
   inhibit_try_window_id = 0;
diff --git a/src/xfaces.c b/src/xfaces.c
index a319c542b07..021d40559e5 100644
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -441,7 +441,7 @@ static Lisp_Object Vparam_value_alist;
 
 /* The total number of colors currently allocated.  */
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 static int ncolors_allocated;
 static int npixmaps_allocated;
 static int ngcs;
@@ -1010,7 +1010,7 @@ load_pixmap (FRAME_PTR f, Lisp_Object name, unsigned int *w_ptr,
     }
   else
     {
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
       ++npixmaps_allocated;
 #endif
       if (w_ptr)
@@ -1375,7 +1375,7 @@ load_color (struct frame *f, struct face *face, Lisp_Object name,
           abort ();
         }
     }
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   else
     ++ncolors_allocated;
 #endif
@@ -1855,7 +1855,6 @@ the WIDTH times as wide as FACE on FRAME.  */)
 #define LFACE_INHERIT(LFACE)        AREF ((LFACE), LFACE_INHERIT_INDEX)
 #define LFACE_FONTSET(LFACE)        AREF ((LFACE), LFACE_FONTSET_INDEX)
 
-#ifdef ENABLE_CHECKING
 /* Non-zero if LFACE is a Lisp face.  A Lisp face is a vector of size
    LFACE_VECTOR_SIZE which has the symbol `face' in slot 0.  */
 
@@ -1863,10 +1862,9 @@ the WIDTH times as wide as FACE on FRAME.  */)
      (VECTORP (LFACE)                                   \
       && ASIZE (LFACE) == LFACE_VECTOR_SIZE             \
       && EQ (AREF (LFACE, 0), Qface))
-#endif
 
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 /* Check consistency of Lisp face attribute vector ATTRS.  */
 
@@ -1953,12 +1951,12 @@ check_lface (Lisp_Object lface)
     }
 }
 
-#else /* GLYPH_DEBUG == 0 */
+#else /* not GLYPH_DEBUG */
 
 #define check_lface_attrs(attrs)        (void) 0
 #define check_lface(lface)              (void) 0
 
-#endif /* GLYPH_DEBUG == 0 */
+#endif /* GLYPH_DEBUG */
 
 
 
@@ -4461,7 +4459,7 @@ cache_face (struct face_cache *c, struct face *face, unsigned int hash)
       break;
   face->id = i;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   /* Check that FACE got a unique id.  */
   {
     int j, n;
@@ -4547,7 +4545,7 @@ lookup_face (struct frame *f, Lisp_Object *attr)
   if (face == NULL)
     face = realize_face (cache, attr, -1);
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   eassert (face == FACE_FROM_ID (f, face->id));
 #endif /* GLYPH_DEBUG */
 
@@ -6450,7 +6448,7 @@ where R,G,B are numbers between 0 and 255 and name is an arbitrary string.  */)
                                 Tests
  ***********************************************************************/
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 /* Print the contents of the realized face FACE to stderr.  */
 
@@ -6525,7 +6523,7 @@ DEFUN ("show-face-resources", Fshow_face_resources, Sshow_face_resources,
   return Qnil;
 }
 
-#endif /* GLYPH_DEBUG != 0 */
+#endif /* GLYPH_DEBUG */
 
 
 
@@ -6649,7 +6647,7 @@ syms_of_xfaces (void)
   defsubr (&Sinternal_set_alternative_font_family_alist);
   defsubr (&Sinternal_set_alternative_font_registry_alist);
   defsubr (&Sface_attributes_as_vector);
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   defsubr (&Sdump_face);
   defsubr (&Sshow_face_resources);
 #endif /* GLYPH_DEBUG */
diff --git a/src/xfns.c b/src/xfns.c
index 00cf9f8e081..13c7070e229 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -136,7 +136,7 @@ static Lisp_Object Qundefined_color;
 static Lisp_Object Qcompound_text, Qcancel_timer;
 Lisp_Object Qfont_param;
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 static ptrdiff_t image_cache_refcount;
 static int dpyinfo_refcount;
 #endif
@@ -2914,14 +2914,14 @@ unwind_create_frame (Lisp_Object frame)
   /* If frame is ``official'', nothing to do.  */
   if (NILP (Fmemq (frame, Vframe_list)))
     {
-#if GLYPH_DEBUG && defined ENABLE_CHECKING
+#if defined GLYPH_DEBUG && defined ENABLE_CHECKING
       struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (f);
 #endif
 
       x_free_frame_resources (f);
       free_glyphs (f);
 
-#if GLYPH_DEBUG
+#if defined GLYPH_DEBUG && defined ENABLE_CHECKING
       /* Check that reference counts are indeed correct.  */
       eassert (dpyinfo->reference_count == dpyinfo_refcount);
       eassert (dpyinfo->terminal->image_cache->refcount == image_cache_refcount);
@@ -3296,7 +3296,7 @@ This function is an internal primitive--use `make-frame' instead.  */)
                                         "scrollBarBackground",
                                         "ScrollBarBackground", 0);
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   image_cache_refcount =
     FRAME_IMAGE_CACHE (f) ? FRAME_IMAGE_CACHE (f)->refcount : 0;
   dpyinfo_refcount = dpyinfo->reference_count;
@@ -4730,7 +4730,7 @@ x_create_tip_frame (struct x_display_info *dpyinfo,
   x_default_parameter (f, parms, Qborder_color, build_string ("black"),
                        "borderColor", "BorderColor", RES_TYPE_STRING);
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
   image_cache_refcount =
     FRAME_IMAGE_CACHE (f) ? FRAME_IMAGE_CACHE (f)->refcount : 0;
   dpyinfo_refcount = dpyinfo->reference_count;
diff --git a/src/xterm.c b/src/xterm.c
index 8e978edf7d9..846aedc0f5b 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -931,7 +931,7 @@ static void x_draw_box_rect (struct glyph_string *, int, int, int, int,
                              int, int, int, XRectangle *);
 static void x_scroll_bar_clear (struct frame *);
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 static void x_check_font (struct frame *, struct font *);
 #endif
 
@@ -9801,7 +9801,7 @@ x_wm_set_icon_position (struct frame *f, int icon_x, int icon_y)
                                 Fonts
  ***********************************************************************/
 
-#if GLYPH_DEBUG
+#ifdef GLYPH_DEBUG
 
 /* Check that FONT is valid on frame F.  It is if it can be found in F's
    font table.  */
@@ -9814,7 +9814,7 @@ x_check_font (struct frame *f, struct font *font)
     eassert (font->driver->check (f, font) == 0);
 }
 
-#endif /* GLYPH_DEBUG != 0 */
+#endif /* GLYPH_DEBUG */
 
 
 /***********************************************************************