From: handa <handa>
Date: Fri, 10 Sep 2010 15:38:54 +0000 (+0000)
Subject: Print debug information to mdebug__output instead of stderr.
X-Git-Tag: REL-1-6-2~22
X-Git-Url: http://git.chise.org/gitweb/?a=commitdiff_plain;h=3628173afa3d3f97a9fd07277382fa08c9de8970;p=m17n%2Fm17n-lib.git

Print debug information to mdebug__output instead of stderr.
---

diff --git a/src/charset.c b/src/charset.c
index cd9012d..4168ad0 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -673,7 +673,7 @@ mcharset__load_from_database ()
     return 0;
   MDEBUG_PUSH_TIME ();
   def_list = (MPlist *) mdatabase_load (mdb);
-  MDEBUG_PRINT_TIME ("CHARSET", (stderr, " to load data."));
+  MDEBUG_PRINT_TIME ("CHARSET", (mdebug__output, " to load data."));
   MDEBUG_POP_TIME ();
   if (! def_list)
     return -1;
@@ -699,7 +699,7 @@ mcharset__load_from_database ()
     }
 
   M17N_OBJECT_UNREF (def_list);
-  MDEBUG_PRINT_TIME ("CHARSET", (stderr, " to parse the loaded data."));
+  MDEBUG_PRINT_TIME ("CHARSET", (mdebug__output, " to parse the loaded data."));
   MDEBUG_POP_TIME ();
   return 0;
 }
diff --git a/src/chartab.c b/src/chartab.c
index 947b575..3411999 100644
--- a/src/chartab.c
+++ b/src/chartab.c
@@ -547,18 +547,18 @@ dump_sub_chartab (MSubCharTable *table, void *default_value,
 
   if (! table->contents.tables && table->default_value == default_value)
     return;
-  fprintf (stderr, "\n%s(sub%d (U+%04X U+%04X) ",
+  fprintf (mdebug__output, "\n%s(sub%d (U+%04X U+%04X) ",
 	   prefix, depth, min_char, max_char);
   if (key == Msymbol)
     {
       if (table->default_value)
-	fprintf (stderr, "(default %s)",
+	fprintf (mdebug__output, "(default %s)",
 		 ((MSymbol) table->default_value)->name);
       else
-	fprintf (stderr, "(default nil)");
+	fprintf (mdebug__output, "(default nil)");
     }
   else
-    fprintf (stderr, "(default #x%X)", (unsigned) table->default_value);
+    fprintf (mdebug__output, "(default #x%X)", (unsigned) table->default_value);
 
   default_value = table->default_value;
   if (table->contents.tables)
@@ -575,23 +575,24 @@ dump_sub_chartab (MSubCharTable *table, void *default_value,
 	    if (val == default_value)
 	      continue;
 	    default_value = *val;
-	    fprintf (stderr, "\n%s  (U+%04X", prefix, min_char);
+	    fprintf (mdebug__output, "\n%s  (U+%04X", prefix, min_char);
 	    while (i + 1 < chartab_slots[depth]
 		   && val[1] == default_value)
 	      i++, val++, min_char++;
-	    fprintf (stderr, "-U+%04X ", min_char);
+	    fprintf (mdebug__output, "-U+%04X ", min_char);
 	    if (key == Msymbol)
 	      {
 		if (default_value)
-		  fprintf (stderr, "%s)", ((MSymbol) default_value)->name);
+		  fprintf (mdebug__output, "%s)",
+			   ((MSymbol) default_value)->name);
 		else
-		  fprintf (stderr, "nil)");
+		  fprintf (mdebug__output, "nil)");
 	      }
 	    else
-	      fprintf (stderr, " #xx%X)", (unsigned) default_value);
+	      fprintf (mdebug__output, " #xx%X)", (unsigned) default_value);
 	  }
     }
-  fprintf (stderr, ")");
+  fprintf (mdebug__output, ")");
 }
 
 
@@ -975,8 +976,9 @@ mchartable_map (MCharTable *table, void *ignore,
     @brief Dump a chartable.
 
     The mdebug_dump_chartab () function prints a chartable $TABLE in a
-    human readable way to the stderr.  $INDENT specifies how many
-    columns to indent the lines but the first one.
+    human readable way to the stderr or to what specified by the
+    environment variable MDEBUG_OUTPUT_FILE.  $INDENT specifies how
+    many columns to indent the lines but the first one.
 
     @return
     This function returns $TABLE.  */
@@ -984,8 +986,9 @@ mchartable_map (MCharTable *table, void *ignore,
 /***ja
     @brief ʸ»ú¥Æ¡¼¥Ö¥ë¤ò¥À¥ó¥×¤¹¤ë.
 
-    ´Ø¿ô mdebug_dump_chartab () ¤Ïʸ»ú¥Æ¡¼¥Ö¥ë $TABLE ¤ò stderr 
-    ¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç°õºþ¤¹¤ë¡£$INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
+    ´Ø¿ô mdebug_dump_chartab () ¤Ïʸ»ú¥Æ¡¼¥Ö¥ë $TABLE ¤òɸ½à¥¨¥é¡¼½ÐÎÏ
+    ¤â¤·¤¯¤Ï´Ä¶­ÊÑ¿ô MDEBUG_DUMP_FONT ¤Ç»ØÄꤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë¿Í´Ö¤Ë²ÄÆÉ
+    ¤Ê·Á¤Ç°õºþ¤¹¤ë¡£$INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
 
     @return
     ¤³¤Î´Ø¿ô¤Ï $TABLE ¤òÊÖ¤¹¡£  */
@@ -993,11 +996,11 @@ mchartable_map (MCharTable *table, void *ignore,
 MCharTable *
 mdebug_dump_chartab (MCharTable *table, int indent)
 {
-  fprintf (stderr, "(chartab (U+%04X U+%04X)",
+  fprintf (mdebug__output, "(chartab (U+%04X U+%04X)",
 	   table->min_char, table->max_char);
   dump_sub_chartab (&table->subtable, table->subtable.default_value,
 		    table->key, indent + 2);
-  fprintf (stderr, ")");
+  fprintf (mdebug__output, ")");
   return table;
 }
 
diff --git a/src/coding.c b/src/coding.c
index 5fb2c07..61e8d1a 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -3049,7 +3049,7 @@ mcoding__load_from_database ()
     return 0;
   MDEBUG_PUSH_TIME ();
   def_list = (MPlist *) mdatabase_load (mdb);
-  MDEBUG_PRINT_TIME ("CODING", (stderr, " to load the data."));
+  MDEBUG_PRINT_TIME ("CODING", (mdebug__output, " to load the data."));
   MDEBUG_POP_TIME ();
   if (! def_list)
     return -1;
@@ -3083,7 +3083,7 @@ mcoding__load_from_database ()
     }
 
   M17N_OBJECT_UNREF (def_list);
-  MDEBUG_PRINT_TIME ("CODING", (stderr, " to parse the loaded data."));
+  MDEBUG_PRINT_TIME ("CODING", (mdebug__output, " to parse the loaded data."));
   MDEBUG_POP_TIME ();
   return 0;
 }
diff --git a/src/face.c b/src/face.c
index f5d2ebf..d2ebdb1 100644
--- a/src/face.c
+++ b/src/face.c
@@ -2051,9 +2051,10 @@ mface_update (MFrame *frame, MFace *face)
 /***en
     @brief Dump a face.
 
-    The mdebug_dump_face () function prints face $FACE in a human readable
-    way to the stderr.  $INDENT specifies how many columns to indent
-    the lines but the first one.
+    The mdebug_dump_face () function prints face $FACE in a human
+    readable way to the stderr or to what specified by the environment
+    variable MDEBUG_OUTPUT_FILE.  $INDENT specifies how many columns
+    to indent the lines but the first one.
 
     @return
     This function returns $FACE.  */
@@ -2061,8 +2062,9 @@ mface_update (MFrame *frame, MFace *face)
 /***ja
     @brief ¥Õ¥§¡¼¥¹¤ò¥À¥ó¥×¤¹¤ë.
 
-    ´Ø¿ô mdebug_dump_face () ¤Ï¥Õ¥§¡¼¥¹ $FACE ¤ò stderr 
-    ¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç°õºþ¤¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
+    ´Ø¿ô mdebug_dump_face () ¤Ï¥Õ¥§¡¼¥¹ $FACE ¤òɸ½à¥¨¥é¡¼½ÐÎϤ⤷¤¯¤Ï
+    ´Ä¶­ÊÑ¿ô MDEBUG_DUMP_FONT ¤Ç»ØÄꤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç°õ
+    ºþ¤¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
 
     @return
     ¤³¤Î´Ø¿ô¤Ï $FACE ¤òÊÖ¤¹¡£  */
@@ -2076,15 +2078,17 @@ mdebug_dump_face (MFace *face, int indent)
   memset (prefix, 32, indent);
   prefix[indent] = 0;
   mfont__set_spec_from_face (&spec, face);
-  fprintf (stderr, "(face font:\"");
+  fprintf (mdebug__output, "(face font:\"");
   mdebug_dump_font (&spec);
-  fprintf (stderr, "\"\n %s  fore:%s back:%s", prefix,
+  fprintf (mdebug__output, "\"\n %s  fore:%s back:%s", prefix,
 	   msymbol_name ((MSymbol) face->property[MFACE_FOREGROUND]),
 	   msymbol_name ((MSymbol) face->property[MFACE_BACKGROUND]));
   if (face->property[MFACE_FONTSET])
-    fprintf (stderr, " non-default-fontset");
-  fprintf (stderr, " hline:%s", face->property[MFACE_HLINE] ? "yes" : "no");
-  fprintf (stderr, " box:%s)", face->property[MFACE_BOX] ? "yes" : "no");
+    fprintf (mdebug__output, " non-default-fontset");
+  fprintf (mdebug__output, " hline:%s",
+	   face->property[MFACE_HLINE] ? "yes" : "no");
+  fprintf (mdebug__output, " box:%s)",
+	   face->property[MFACE_BOX] ? "yes" : "no");
   return face;
 }
 
diff --git a/src/font.c b/src/font.c
index 5ebdaa0..7643712 100644
--- a/src/font.c
+++ b/src/font.c
@@ -1446,9 +1446,9 @@ mdebug_dump_font_list (MFontList *font_list)
 
   for (i = 0; i < font_list->nfonts; i++)
     {
-      fprintf (stderr, "%04X - ", font_list->fonts[i].score);
+      fprintf (mdebug__output, "%04X - ", font_list->fonts[i].score);
       mdebug_dump_font (font_list->fonts[i].font);
-      fprintf (stderr, "\n");
+      fprintf (mdebug__output, "\n");
     }
 }
 
@@ -3184,16 +3184,18 @@ mfont_close (MFont *font)
 /***en
     @brief Dump a font.
 
-    The mdebug_dump_font () function prints font $FONT in a human readable
-    way to the stderr.
+    The mdebug_dump_font () function prints font $FONT in a human
+    readable way to the stderr or to what specified by the environment
+    variable MDEBUG_OUTPUT_FILE.
 
     @return
     This function returns $FONT.  */
 /***ja
     @brief ¥Õ¥©¥ó¥È¤ò¥À¥ó¥×¤¹¤ë.
 
-    ´Ø¿ô mdebug_dump_font () ¤Ï¥Õ¥©¥ó¥È $FONT ¤ò stderr 
-    ¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç°õºþ¤¹¤ë¡£
+    ´Ø¿ô mdebug_dump_font () ¤Ï¥Õ¥©¥ó¥È $FONT ¤òɸ½à¥¨¥é¡¼½ÐÎϤ⤷¤¯¤Ï
+    ´Ä¶­ÊÑ¿ô MDEBUG_DUMP_FONT ¤Ç»ØÄꤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç½Ð
+    ÎϤ¹¤ë¡£
 
     @return
     ¤³¤Î´Ø¿ô¤Ï $FONT ¤òÊÖ¤¹¡£  */
@@ -3206,7 +3208,7 @@ mdebug_dump_font (MFont *font)
   name = xlfd_unparse_name (font, 0);
   if (name)
     {
-      fprintf (stderr, "%s", name);
+      fprintf (mdebug__output, "%s", name);
       free (name);
     }
   if (font->file != Mnil)
@@ -3218,11 +3220,11 @@ mdebug_dump_font (MFont *font)
 	if (*p == '/')
 	  lastslash = p;
       if (name)
-	fprintf (stderr, ",");
-      fprintf (stderr, "%s", lastslash + 1);
+	fprintf (mdebug__output, ",");
+      fprintf (mdebug__output, "%s", lastslash + 1);
     }
   if (font->capability != Mnil)
-    fprintf (stderr, "%s", MSYMBOL_NAME (font->capability));
+    fprintf (mdebug__output, "%s", MSYMBOL_NAME (font->capability));
   return font;
 }
 
diff --git a/src/fontset.c b/src/fontset.c
index 2f2ca55..6cb9d7d 100644
--- a/src/fontset.c
+++ b/src/fontset.c
@@ -1450,17 +1450,19 @@ mfontset_lookup (MFontset *fontset,
 /***en
     @brief Dump a fontset.
 
-    The mdebug_dump_fontset () function prints fontset $FONTSET in a human readable
-    way to the stderr.  $INDENT specifies how many columns to indent
-    the lines but the first one.
+    The mdebug_dump_fontset () function prints fontset $FONTSET in a
+    human readable way to the stderr or to what specified by the
+    environment variable MDEBUG_OUTPUT_FILE.  $INDENT specifies how
+    many columns to indent the lines but the first one.
 
     @return
     This function returns $FONTSET.  */
 /***ja
     @brief ¥Õ¥©¥ó¥È¥»¥Ã¥È¤ò¥À¥ó¥×¤¹¤ë.
 
-    ´Ø¿ô mdebug_dump_face () ¤Ï¥Õ¥©¥ó¥È¥»¥Ã¥È $FONTSET ¤ò stderr 
-    ¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç°õºþ¤¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
+    ´Ø¿ô mdebug_dump_face () ¤Ï¥Õ¥©¥ó¥È¥»¥Ã¥È $FONTSET ¤òɸ½à¥¨¥é¡¼½ÐÎÏ
+    ¤â¤·¤¯¤Ï´Ä¶­ÊÑ¿ô MDEBUG_DUMP_FONT ¤Ç»ØÄꤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë¿Í´Ö¤Ë²ÄÆÉ
+    ¤Ê·Á¤Ç½ÐÎϤ¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
 
     @return
     ¤³¤Î´Ø¿ô¤Ï $FONTSET ¤òÊÖ¤¹¡£  */
@@ -1474,48 +1476,50 @@ mdebug_dump_fontset (MFontset *fontset, int indent)
   memset (prefix, 32, indent);
   prefix[indent] = 0;
 
-  fprintf (stderr, "(fontset %s", fontset->name->name);
+  fprintf (mdebug__output, "(fontset %s", fontset->name->name);
   if (fontset->per_script)
     MPLIST_DO (plist, fontset->per_script)
       {
-	fprintf (stderr, "\n  %s(%s", prefix, MPLIST_KEY (plist)->name);
+	fprintf (mdebug__output, "\n  %s(%s", prefix, MPLIST_KEY (plist)->name);
 	MPLIST_DO (pl, MPLIST_PLIST (plist))
 	  {
-	    fprintf (stderr, "\n    %s(%s", prefix, MPLIST_KEY (pl)->name);
+	    fprintf (mdebug__output, "\n    %s(%s", prefix,
+		     MPLIST_KEY (pl)->name);
 	    MPLIST_DO (p, MPLIST_PLIST (pl))
 	      {
-		fprintf (stderr, "\n      %s(0x%X %s ", prefix,
+		fprintf (mdebug__output, "\n      %s(0x%X %s ", prefix,
 			 (unsigned) MPLIST_VAL (p),
 			 MPLIST_KEY (p)->name);
 		mdebug_dump_font (MPLIST_VAL (p));
-		fprintf (stderr, ")");
+		fprintf (mdebug__output, ")");
 	      }
-	    fprintf (stderr, ")");
+	    fprintf (mdebug__output, ")");
 	  }
-	fprintf (stderr, ")");
+	fprintf (mdebug__output, ")");
       }
   if (fontset->per_charset)
     MPLIST_DO (pl, fontset->per_charset)
       {
-	fprintf (stderr, "\n  %s(%s", prefix, MPLIST_KEY (pl)->name);
+	fprintf (mdebug__output, "\n  %s(%s", prefix, MPLIST_KEY (pl)->name);
 	MPLIST_DO (p, MPLIST_PLIST (pl))
 	  {
-	    fprintf (stderr, "\n    %s(%s ", prefix, MPLIST_KEY (p)->name);
+	    fprintf (mdebug__output, "\n    %s(%s ", prefix,
+		     MPLIST_KEY (p)->name);
 	    mdebug_dump_font (MPLIST_VAL (p));
-	    fprintf (stderr, ")");
+	    fprintf (mdebug__output, ")");
 	  }
-	fprintf (stderr, ")");
+	fprintf (mdebug__output, ")");
       }
 
   if (fontset->fallback)
     MPLIST_DO (p, fontset->fallback)
       {
-	fprintf (stderr, "\n  %s(%s ", prefix, MPLIST_KEY (p)->name);
+	fprintf (mdebug__output, "\n  %s(%s ", prefix, MPLIST_KEY (p)->name);
 	mdebug_dump_font (MPLIST_VAL (p));
-	fprintf (stderr, ")");
+	fprintf (mdebug__output, ")");
       }
 
-  fprintf (stderr, ")");
+  fprintf (mdebug__output, ")");
   return fontset;
 }
 
diff --git a/src/input.c b/src/input.c
index c9c6fc1..61baa7a 100644
--- a/src/input.c
+++ b/src/input.c
@@ -4011,24 +4011,24 @@ dump_im_map (MPlist *map_list, int indent)
   memset (prefix, 32, indent);
   prefix[indent] = '\0';
 
-  fprintf (stderr, "(\"%s\" ", msymbol_name (key));
+  fprintf (mdebug__output, "(\"%s\" ", msymbol_name (key));
   if (map->map_actions)
     mdebug_dump_plist (map->map_actions, indent + 2);
   if (map->submaps)
     {
       MPLIST_DO (map_list, map->submaps)
 	{
-	  fprintf (stderr, "\n%s  ", prefix);
+	  fprintf (mdebug__output, "\n%s  ", prefix);
 	  dump_im_map (map_list, indent + 2);
 	}
     }
   if (map->branch_actions)
     {
-      fprintf (stderr, "\n%s  (branch\n%s    ", prefix, prefix);
+      fprintf (mdebug__output, "\n%s  (branch\n%s    ", prefix, prefix);
       mdebug_dump_plist (map->branch_actions, indent + 4);
-      fprintf (stderr, ")");      
+      fprintf (mdebug__output, ")");      
     }
-  fprintf (stderr, ")");
+  fprintf (mdebug__output, ")");
 }
 
 
@@ -4042,16 +4042,16 @@ dump_im_state (MIMState *state, int indent)
   memset (prefix, 32, indent);
   prefix[indent] = '\0';
 
-  fprintf (stderr, "(%s", msymbol_name (state->name));
+  fprintf (mdebug__output, "(%s", msymbol_name (state->name));
   if (state->map->submaps)
     {
       MPLIST_DO (map_list, state->map->submaps)
 	{
-	  fprintf (stderr, "\n%s  ", prefix);
+	  fprintf (mdebug__output, "\n%s  ", prefix);
 	  dump_im_map (map_list, indent + 2);
 	}
     }
-  fprintf (stderr, ")");
+  fprintf (mdebug__output, ")");
 }
 
 
@@ -6353,16 +6353,18 @@ minput_callback (MInputContext *ic, MSymbol command)
     @brief Dump an input method.
 
     The mdebug_dump_im () function prints the input method $IM in a
-    human readable way to the stderr.  $INDENT specifies how many
-    columns to indent the lines but the first one.
+    human readable way to the stderr or to what specified by the
+    environment variable MDEBUG_OUTPUT_FILE.  $INDENT specifies how
+    many columns to indent the lines but the first one.
 
     @return
     This function returns $IM.  */
 /***ja
     @brief ÆþÎϥ᥽¥Ã¥É¤ò¥À¥ó¥×¤¹¤ë.
 
-    ´Ø¿ô mdebug_dump_im () ¤ÏÆþÎϥ᥽¥Ã¥É $IM ¤ò stderr 
-    ¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç°õºþ¤¹¤ë¡£$INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
+    ´Ø¿ô mdebug_dump_im () ¤ÏÆþÎϥ᥽¥Ã¥É $IM ¤òɸ½à¥¨¥é¡¼½ÐÎϤ⤷¤¯¤Ï
+    ´Ä¶­ÊÑ¿ô MDEBUG_DUMP_FONT ¤Ç»ØÄꤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç½Ð
+    ÎϤ¹¤ë¡£$INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
 
     @return
     ¤³¤Î´Ø¿ô¤Ï $IM ¤òÊÖ¤¹¡£  */
@@ -6377,7 +6379,7 @@ mdebug_dump_im (MInputMethod *im, int indent)
   memset (prefix, 32, indent);
   prefix[indent] = '\0';
 
-  fprintf (stderr, "(input-method %s %s ", msymbol_name (im->language),
+  fprintf (mdebug__output, "(input-method %s %s ", msymbol_name (im->language),
 	   msymbol_name (im->name));
   mdebug_dump_mtext (im_info->title, 0, 0);
   if (im->name != Mnil)
@@ -6386,11 +6388,11 @@ mdebug_dump_im (MInputMethod *im, int indent)
 
       MPLIST_DO (state, im_info->states)
 	{
-	  fprintf (stderr, "\n%s  ", prefix);
+	  fprintf (mdebug__output, "\n%s  ", prefix);
 	  dump_im_state (MPLIST_VAL (state), indent + 2);
 	}
     }
-  fprintf (stderr, ")");
+  fprintf (mdebug__output, ")");
   return im;
 }
 
diff --git a/src/m17n-X.c b/src/m17n-X.c
index 09f57ca..58cbf49 100644
--- a/src/m17n-X.c
+++ b/src/m17n-X.c
@@ -1821,7 +1821,7 @@ mwin__dump_region (MDrawRegion region)
 {
   XRectangle rect;
   XClipBox (region, &rect);
-  fprintf (stderr, "(%d %d %d %d)\n", rect.x, rect.y, rect.width, rect.height);
+  fprintf (mdebug__output, "(%d %d %d %d)\n", rect.x, rect.y, rect.width, rect.height);
 }
 
 
@@ -1918,7 +1918,7 @@ mwin__print_event (void *arg, char *win_name)
     default: event_name = "unknown";
     }
 
-  fprintf (stderr, "%s: %s\n", win_name, event_name);
+  fprintf (mdebug__output, "%s: %s\n", win_name, event_name);
 }
 #endif
 
@@ -2077,9 +2077,9 @@ mwin__dump_gc (MFrame *frame, MRealizedFace *rface)
   for (i = 0; i <= GC_INVERSE; i++)
     {
       XGetGCValues (display, info->gc[i], valuemask, &values);
-      fprintf (stderr, "GC%d: fore/#%lX back/#%lX", i,
+      fprintf (mdebug__output, "GC%d: fore/#%lX back/#%lX", i,
 	       values.foreground, values.background);
-      fprintf (stderr, "\n");
+      fprintf (mdebug__output, "\n");
     }
 }
 
diff --git a/src/m17n-core.c b/src/m17n-core.c
index f29f2e6..db825a4 100644
--- a/src/m17n-core.c
+++ b/src/m17n-core.c
@@ -424,15 +424,15 @@ static M17NObjectArray *object_array_root;
 static void
 report_object_array ()
 {
-  fprintf (stderr, "%16s %7s %7s %7s\n",
+  fprintf (mdebug__output, "%16s %7s %7s %7s\n",
 	   "object", "created", "freed", "alive");
-  fprintf (stderr, "%16s %7s %7s %7s\n",
+  fprintf (mdebug__output, "%16s %7s %7s %7s\n",
 	   "------", "-------", "-----", "-----");
   for (; object_array_root; object_array_root = object_array_root->next)
     {
       M17NObjectArray *array = object_array_root;
 
-      fprintf (stderr, "%16s %7d %7d %7d\n", array->name,
+      fprintf (mdebug__output, "%16s %7d %7d %7d\n", array->name,
 	       array->used, array->used - array->count, array->count);
       if (array->count > 0)
 	{
@@ -444,14 +444,14 @@ report_object_array ()
 	      MText *mt = (MText *) array->objects[i];
 
 	      if (mt->format <= MTEXT_FORMAT_UTF_8)
-		fprintf (stderr, "\t\"%s\"\n", (char *) mt->data);
+		fprintf (mdebug__output, "\t\"%s\"\n", (char *) mt->data);
 	    }
 	  else if (strcmp (array->name, "Plist") == 0)
 	    {
 	      MPlist *plist = (MPlist *) array->objects[i];
 
 	      mdebug_dump_plist (plist, 8);
-	      fprintf (stderr, "\n");
+	      fprintf (mdebug__output, "\n");
 	    }
 	}
 
@@ -498,7 +498,7 @@ mdebug__print_time ()
   gettimeofday (&tv, &tz);
   diff = ((tv.tv_sec - time_stack[time_stack_index - 1].tv_sec) * 1000000
 	  + (tv.tv_usec - time_stack[time_stack_index - 1].tv_usec));
-  fprintf (stderr, "%8ld ms.", diff);
+  fprintf (mdebug__output, "%8ld ms.", diff);
   time_stack[time_stack_index - 1] = tv;
 }
 
@@ -612,22 +612,25 @@ m17n_init_core (void)
   MDEBUG_PUSH_TIME ();
   if (msymbol__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize symbol module."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to initialize symbol module."));
   if  (mplist__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize plist module."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to initialize plist module."));
   if (mchar__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize character module."));
+  MDEBUG_PRINT_TIME ("INIT",
+		     (mdebug__output, " to initialize character module."));
   if  (mchartable__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize chartable module."));
+  MDEBUG_PRINT_TIME ("INIT",
+		     (mdebug__output, " to initialize chartable module."));
   if (mtext__init () < 0 || mtext__prop_init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize mtext module."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to initialize mtext module."));
   if (mdatabase__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize database module."));
+  MDEBUG_PRINT_TIME ("INIT",
+		     (mdebug__output, " to initialize database module."));
 
 #if ENABLE_NLS
   bindtextdomain ("m17n-lib", GETTEXTDIR);
@@ -640,7 +643,8 @@ m17n_init_core (void)
 
  err:
   MDEBUG_POP_TIME ();
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize the core modules."));
+  MDEBUG_PRINT_TIME ("INIT",
+		     (mdebug__output, " to initialize the core modules."));
   MDEBUG_POP_TIME ();
 }
 
@@ -656,19 +660,19 @@ m17n_fini_core (void)
   MDEBUG_PUSH_TIME ();
   MDEBUG_PUSH_TIME ();
   mchartable__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize chartable module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize chartable module."));
   mtext__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize mtext module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize mtext module."));
   msymbol__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize symbol module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize symbol module."));
   mplist__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize plist module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize plist module."));
   /* We must call this after the aboves because it frees interval
      pools.  */
   mtext__prop_fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize textprop module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize textprop module."));
   MDEBUG_POP_TIME ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize the core modules."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize the core modules."));
   MDEBUG_POP_TIME ();
   if (mdebug__flags[MDEBUG_FINI])
     report_object_array ();
@@ -1066,7 +1070,7 @@ void (*m17n_memory_full_handler) (enum MErrorCode err);
     <ul>
 
     <li> Environment variables to control printing of various
-    information.
+    information to stderr.
 
     <ul>
 
@@ -1098,6 +1102,10 @@ void (*m17n_memory_full_handler) (enum MErrorCode err);
     <li> MDEBUG_ALL -- Setting this variable to 1 is equivalent to
     setting all the above variables to 1.
 
+    <li> MDEBUG_OUTPUT_FILE -- If set to a file name, the above
+    debugging information is appended to the file.  If set to
+    "stdout", the information is printed to stdout.
+
     </ul>
 
     <li> Functions to print various objects in a human readable way.
@@ -1116,7 +1124,7 @@ void (*m17n_memory_full_handler) (enum MErrorCode err);
 
     <ul>
 
-    <li> ¤µ¤Þ¤¶¤Þ¤Ê¾ðÊó¤Î¥×¥ê¥ó¥È¤òÀ©¸æ¤¹¤ë´Ä¶­ÊÑ¿ô¡£
+    <li> ¤µ¤Þ¤¶¤Þ¤Ê¾ðÊó¤Îɸ½à¥¨¥é¡¼½ÐÎϤؤΥץê¥ó¥È¤òÀ©¸æ¤¹¤ë´Ä¶­ÊÑ¿ô¡£
 
     <ul>
 
@@ -1148,6 +1156,10 @@ void (*m17n_memory_full_handler) (enum MErrorCode err);
     <li> MDEBUG_ALL -- 1 ¤Ê¤é¤Ð¡¢¾åµ­¤¹¤Ù¤Æ¤ÎÊÑ¿ô¤ò 1 
     ¤Ë¤·¤¿¤Î¤ÈƱ¤¸¸ú²Ì¤ò»ý¤Ä¡£
 
+    <li> MDEBUG_OUTPUT_FILE -- ¤â¤·¥Õ¥¡¥¤¥ë̾¤Ê¤é¡¢¾åµ­¥Ç¥Ð¥Ã¥°¾ðÊó¤Ï¤½
+    ¤Î¥Õ¥¡¥¤¥ë¤ËÄɲ䵤ì¤ë¡£¤â¤· "stdout" ¤Ê¤é¤½¤Î¾ðÊó¤Ïɸ½à½ÐÎϤ˽ÐÎÏ
+    ¤µ¤ì¤ë¡£
+
     </ul>
 
     <li> ¼ï¡¹¤Î¥ª¥Ö¥¸¥§¥¯¥È¤ò¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç¥×¥ê¥ó¥È¤¹¤ë´Ø¿ô¡£¾ÜºÙ¤Ï´Ø¿ô
diff --git a/src/m17n-flt.c b/src/m17n-flt.c
index e082fe3..7423026 100644
--- a/src/m17n-flt.c
+++ b/src/m17n-flt.c
@@ -2672,7 +2672,7 @@ m17n_init_flt (void)
   mflt_font_id = NULL;
   mflt_try_otf = NULL;
 
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize the flt modules."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to initialize the flt modules."));
   MDEBUG_POP_TIME ();
 }
 
@@ -2687,7 +2687,7 @@ m17n_fini_flt (void)
 
   MDEBUG_PUSH_TIME ();
   free_flt_list ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize the flt modules."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize the flt modules."));
   MDEBUG_POP_TIME ();
   m17n_fini_core ();
 }
@@ -3113,7 +3113,7 @@ dump_flt_cmd (FontLayoutStage *stage, int id, int indent)
   prefix[indent] = 0;
 
   if (id >= 0)
-    fprintf (stderr, "0x%02X", id);
+    fprintf (mdebug__output, "0x%02X", id);
   else if (id <= CMD_ID_OFFSET_INDEX)
     {
       int idx = CMD_ID_TO_INDEX (id);
@@ -3124,57 +3124,58 @@ dump_flt_cmd (FontLayoutStage *stage, int id, int indent)
 	  FontLayoutCmdRule *rule = &cmd->body.rule;
 	  int i;
 
-	  fprintf (stderr, "(rule ");
+	  fprintf (mdebug__output, "(rule ");
 	  if (rule->src_type == SRC_REGEX)
-	    fprintf (stderr, "\"%s\"", rule->src.re.pattern);
+	    fprintf (mdebug__output, "\"%s\"", rule->src.re.pattern);
 	  else if (rule->src_type == SRC_INDEX)
-	    fprintf (stderr, "%d", rule->src.match_idx);
+	    fprintf (mdebug__output, "%d", rule->src.match_idx);
 	  else if (rule->src_type == SRC_SEQ)
-	    fprintf (stderr, "(seq)");
+	    fprintf (mdebug__output, "(seq)");
 	  else if (rule->src_type == SRC_RANGE)
-	    fprintf (stderr, "(range)");
+	    fprintf (mdebug__output, "(range)");
 	  else
-	    fprintf (stderr, "(invalid src)");
+	    fprintf (mdebug__output, "(invalid src)");
 
 	  for (i = 0; i < rule->n_cmds; i++)
 	    {
-	      fprintf (stderr, "\n%s  ", prefix);
+	      fprintf (mdebug__output, "\n%s  ", prefix);
 	      dump_flt_cmd (stage, rule->cmd_ids[i], indent + 2);
 	    }
-	  fprintf (stderr, ")");
+	  fprintf (mdebug__output, ")");
 	}
       else if (cmd->type == FontLayoutCmdTypeCond)
 	{
 	  FontLayoutCmdCond *cond = &cmd->body.cond;
 	  int i;
 
-	  fprintf (stderr, "(cond");
+	  fprintf (mdebug__output, "(cond");
 	  for (i = 0; i < cond->n_cmds; i++)
 	    {
-	      fprintf (stderr, "\n%s  ", prefix);
+	      fprintf (mdebug__output, "\n%s  ", prefix);
 	      dump_flt_cmd (stage, cond->cmd_ids[i], indent + 2);
 	    }
-	  fprintf (stderr, ")");
+	  fprintf (mdebug__output, ")");
 	}
       else if (cmd->type == FontLayoutCmdTypeOTF)
 	{
-	  fprintf (stderr, "(otf)");
+	  fprintf (mdebug__output, "(otf)");
 	}
       else
-	fprintf (stderr, "(error-command)");
+	fprintf (mdebug__output, "(error-command)");
     }
   else if (id <= CMD_ID_OFFSET_COMBINING)
-    fprintf (stderr, "cominging-code");
+    fprintf (mdebug__output, "cominging-code");
   else
-    fprintf (stderr, "(predefiend %d)", id);
+    fprintf (mdebug__output, "(predefiend %d)", id);
 }
 
 /***en
     @brief Dump a Font Layout Table.
 
     The mdebug_dump_flt () function prints the Font Layout Table $FLT
-    in a human readable way to the stderr.  $INDENT specifies how many
-    columns to indent the lines but the first one.
+    in a human readable way to the stderr or to what specified by the
+    environment variable MDEBUG_OUTPUT_FILE.  $INDENT specifies how
+    many columns to indent the lines but the first one.
 
     @return
     This function returns $FLT.  */
@@ -3188,22 +3189,22 @@ mdebug_dump_flt (MFLT *flt, int indent)
 
   memset (prefix, 32, indent);
   prefix[indent] = 0;
-  fprintf (stderr, "(flt");
+  fprintf (mdebug__output, "(flt");
   MPLIST_DO (plist, flt->stages)
     {
       FontLayoutStage *stage = (FontLayoutStage *) MPLIST_VAL (plist);
       int i;
 
-      fprintf (stderr, "\n%s  (stage %d", prefix, stage_idx);
+      fprintf (mdebug__output, "\n%s  (stage %d", prefix, stage_idx);
       for (i = 0; i < stage->used; i++)
 	{
-	  fprintf (stderr, "\n%s    ", prefix);
+	  fprintf (mdebug__output, "\n%s    ", prefix);
 	  dump_flt_cmd (stage, INDEX_TO_CMD_ID (i), indent + 4);
 	}
-      fprintf (stderr, ")");
+      fprintf (mdebug__output, ")");
       stage_idx++;
     }
-  fprintf (stderr, ")");
+  fprintf (mdebug__output, ")");
   return flt;
 }
 
@@ -3212,14 +3213,14 @@ mflt_dump_gstring (MFLTGlyphString *gstring)
 {
   int i;
 
-  fprintf (stderr, "(flt-gstring");
+  fprintf (mdebug__output, "(flt-gstring");
   for (i = 0; i < gstring->used; i++)
     {
       MFLTGlyph *g = GREF (gstring, i);
-      fprintf (stderr, "\n  (%02d pos:%d-%d c:%04X code:%04X cat:%c)",
+      fprintf (mdebug__output, "\n  (%02d pos:%d-%d c:%04X code:%04X cat:%c)",
 	       i, g->from, g->to, g->c, g->code, GET_CATEGORY_CODE (g));
     }
-  fprintf (stderr, ")\n");
+  fprintf (mdebug__output, ")\n");
 }
 
 /*** @} */
diff --git a/src/m17n-gd.c b/src/m17n-gd.c
index 99269e1..4d98819 100644
--- a/src/m17n-gd.c
+++ b/src/m17n-gd.c
@@ -775,7 +775,8 @@ gd_dump_region (MDrawRegion region)
   MDrawMetric rect;
 
   gd_region_to_rect (region, &rect);
-  fprintf (stderr, "(%d %d %d %d)\n", rect.x, rect.y, rect.width, rect.height);
+  fprintf (mdebug__output, "(%d %d %d %d)\n",
+	   rect.x, rect.y, rect.width, rect.height);
 }
 
 static MDeviceDriver gd_driver =
diff --git a/src/m17n-gui.c b/src/m17n-gui.c
index 5903bf5..d8bf088 100644
--- a/src/m17n-gui.c
+++ b/src/m17n-gui.c
@@ -272,19 +272,20 @@ m17n_init_win (void)
   MDEBUG_PUSH_TIME ();
   if (mfont__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize font module."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to initialize font module."));
   if (mfont__fontset_init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize fontset module."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to initialize fontset module."));
   if (mface__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize face module."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to initialize face module."));
   if (mdraw__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize draw module."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to initialize draw module."));
   if (minput__win_init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize input-win module."));
+  MDEBUG_PRINT_TIME ("INIT",
+		     (mdebug__output, " to initialize input-win module."));
   mframe_default = NULL;
 
   register_device_library (Mx, "libm17n-X");
@@ -293,7 +294,8 @@ m17n_init_win (void)
 
  err:
   MDEBUG_POP_TIME ();
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize the m17n GUI module."));
+  MDEBUG_PRINT_TIME ("INIT",
+		     (mdebug__output, " to initialize the m17n GUI module."));
   MDEBUG_POP_TIME ();
 }
 
@@ -309,7 +311,7 @@ m17n_fini_win (void)
 
   MDEBUG_PUSH_TIME ();
   MDEBUG_PUSH_TIME ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize device modules."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize device modules."));
   MPLIST_DO (plist, device_library_list)
     {
       MDeviceLibraryInterface *interface = MPLIST_VAL (plist);
@@ -331,18 +333,19 @@ m17n_fini_win (void)
 #endif	/* not HAVE_FREETYPE */
   M17N_OBJECT_UNREF (device_library_list);
   minput__win_fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize input-gui module."));
+  MDEBUG_PRINT_TIME ("FINI",
+		     (mdebug__output, " to finalize input-gui module."));
   mdraw__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize draw module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize draw module."));
   mface__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize face module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize face module."));
   mfont__fontset_fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize fontset module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize fontset module."));
   mfont__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize font module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize font module."));
   mframe_default = NULL;
   MDEBUG_POP_TIME ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize the gui modules."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize the gui modules."));
   MDEBUG_POP_TIME ();
   m17n_fini_flt ();
   m17n_fini ();
diff --git a/src/m17n.c b/src/m17n.c
index d25a946..a41b057 100644
--- a/src/m17n.c
+++ b/src/m17n.c
@@ -55,29 +55,32 @@ m17n_init (void)
   MDEBUG_PUSH_TIME ();
   if (mcharset__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize charset module."));
+  MDEBUG_PRINT_TIME ("INIT",
+		     (mdebug__output, " to initialize charset module."));
   if (mcoding__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize conv module."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to initialize conv module."));
   if (mcharset__load_from_database () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to load charset definitions."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to load charset definitions."));
   if (mcoding__load_from_database () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to load coding definitions."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to load coding definitions."));
   if (mlang__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize language module"));
+  MDEBUG_PRINT_TIME ("INIT",
+		     (mdebug__output, " to initialize language module"));
   if (mlocale__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize locale module."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to initialize locale module."));
   if (minput__init () < 0)
     goto err;
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize input module."));
+  MDEBUG_PRINT_TIME ("INIT", (mdebug__output, " to initialize input module."));
 
  err:
   MDEBUG_POP_TIME ();
-  MDEBUG_PRINT_TIME ("INIT", (stderr, " to initialize the shell modules."));
+  MDEBUG_PRINT_TIME ("INIT",
+		     (mdebug__output, " to initialize the shell modules."));
   MDEBUG_POP_TIME ();
 }
 
@@ -93,21 +96,26 @@ m17n_fini (void)
   MDEBUG_PUSH_TIME ();
   MDEBUG_PUSH_TIME ();
   minput__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize input module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize input module."));
   mlocale__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize locale module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize locale module."));
   mlang__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize language module."));
+  MDEBUG_PRINT_TIME ("FINI", (mdebug__output, " to finalize language module."));
   mchar__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize character module."));
+  MDEBUG_PRINT_TIME ("FINI",
+		     (mdebug__output, " to finalize character module."));
   mdatabase__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize database module."));
+  MDEBUG_PRINT_TIME ("FINI",
+		     (mdebug__output, " to finalize database module."));
   mcoding__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize coding module."));
+  MDEBUG_PRINT_TIME ("FINI",
+		     (mdebug__output, " to finalize coding module."));
   mcharset__fini ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize charset module."));
+  MDEBUG_PRINT_TIME ("FINI",
+		     (mdebug__output, " to finalize charset module."));
   MDEBUG_POP_TIME ();
-  MDEBUG_PRINT_TIME ("FINI", (stderr, " to finalize the shell modules."));
+  MDEBUG_PRINT_TIME ("FINI",
+		     (mdebug__output, " to finalize the shell modules."));
   MDEBUG_POP_TIME ();
   m17n_fini_core ();
 }
diff --git a/src/mtext.c b/src/mtext.c
index 64a593c..8efe58e 100644
--- a/src/mtext.c
+++ b/src/mtext.c
@@ -3582,8 +3582,9 @@ mtext_uppercase (MText *mt)
     @brief Dump an M-text.
 
     The mdebug_dump_mtext () function prints the M-text $MT in a human
-    readable way to the stderr.  $INDENT specifies how many columns to
-    indent the lines but the first one.  If $FULLP is zero, this
+    readable way to the stderr or to what specified by the environment
+    variable MDEBUG_OUTPUT_FILE.  $INDENT specifies how many columns
+    to indent the lines but the first one.  If $FULLP is zero, this
     function prints only a character code sequence.  Otherwise, it
     prints the internal byte sequence and text properties as well.
 
@@ -3592,10 +3593,11 @@ mtext_uppercase (MText *mt)
 /***ja
     @brief M-text ¤ò¥À¥ó¥×¤¹¤ë.
 
-    ´Ø¿ô mdebug_dump_mtext () ¤Ï M-text $MT ¤ò stderr 
-    ¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç°õºþ¤¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
-    $FULLP ¤¬ 0 ¤Ê¤é¤Ð¡¢Ê¸»ú¥³¡¼¥ÉÎó¤À¤±¤ò°õºþ¤¹¤ë¡£
-    ¤½¤¦¤Ç¤Ê¤±¤ì¤Ð¡¢ÆâÉô¥Ð¥¤¥ÈÎó¤È¥Æ¥­¥¹¥È¥×¥í¥Ñ¥Æ¥£¤â°õºþ¤¹¤ë¡£
+    ´Ø¿ô mdebug_dump_mtext () ¤Ï M-text $MT ¤òɸ½à¥¨¥é¡¼½ÐÎϤ⤷¤¯¤Ï´Ä
+    ¶­ÊÑ¿ô MDEBUG_DUMP_FONT ¤Ç»ØÄꤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç°õºþ
+    ¤¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£$FULLP ¤¬ 0 ¤Ê¤é
+    ¤Ð¡¢Ê¸»ú¥³¡¼¥ÉÎó¤À¤±¤ò°õºþ¤¹¤ë¡£¤½¤¦¤Ç¤Ê¤±¤ì¤Ð¡¢ÆâÉô¥Ð¥¤¥ÈÎó¤È¥Æ¥­
+    ¥¹¥È¥×¥í¥Ñ¥Æ¥£¤â°õºþ¤¹¤ë¡£
 
     @return
     ¤³¤Î´Ø¿ô¤Ï $MT ¤òÊÖ¤¹¡£  */
@@ -3607,23 +3609,23 @@ mdebug_dump_mtext (MText *mt, int indent, int fullp)
 
   if (! fullp)
     {
-      fprintf (stderr, "\"");
+      fprintf (mdebug__output, "\"");
       for (i = 0; i < mt->nchars; i++)
 	{
 	  int c = mtext_ref_char (mt, i);
 
 	  if (c == '"' || c == '\\')
-	    fprintf (stderr, "\\%c", c);
+	    fprintf (mdebug__output, "\\%c", c);
 	  else if ((c >= ' ' && c < 127) || c == '\n')
-	    fprintf (stderr, "%c", c);
+	    fprintf (mdebug__output, "%c", c);
 	  else
-	    fprintf (stderr, "\\x%02X", c);
+	    fprintf (mdebug__output, "\\x%02X", c);
 	}
-      fprintf (stderr, "\"");
+      fprintf (mdebug__output, "\"");
       return mt;
     }
 
-  fprintf (stderr,
+  fprintf (mdebug__output,
 	   "(mtext (size %d %d %d) (cache %d %d)",
 	   mt->nchars, mt->nbytes, mt->allocated,
 	   mt->cache_char_pos, mt->cache_byte_pos);
@@ -3636,11 +3638,11 @@ mdebug_dump_mtext (MText *mt, int indent, int fullp)
       memset (prefix, 32, indent);
       prefix[indent] = 0;
 
-      fprintf (stderr, "\n%s (bytes \"", prefix);
+      fprintf (mdebug__output, "\n%s (bytes \"", prefix);
       for (i = 0; i < mt->nbytes; i++)
-	fprintf (stderr, "\\x%02x", mt->data[i]);
-      fprintf (stderr, "\")\n");
-      fprintf (stderr, "%s (chars \"", prefix);
+	fprintf (mdebug__output, "\\x%02x", mt->data[i]);
+      fprintf (mdebug__output, "\")\n");
+      fprintf (mdebug__output, "%s (chars \"", prefix);
       p = mt->data;
       for (i = 0; i < mt->nchars; i++)
 	{
@@ -3648,21 +3650,21 @@ mdebug_dump_mtext (MText *mt, int indent, int fullp)
 	  int c = STRING_CHAR_AND_BYTES (p, len);
 
 	  if (c == '"' || c == '\\')
-	    fprintf (stderr, "\\%c", c);
+	    fprintf (mdebug__output, "\\%c", c);
 	  else if (c >= ' ' && c < 127)
-	    fputc (c, stderr);
+	    fputc (c, mdebug__output);
 	  else
-	    fprintf (stderr, "\\x%X", c);
+	    fprintf (mdebug__output, "\\x%X", c);
 	  p += len;
 	}
-      fprintf (stderr, "\")");
+      fprintf (mdebug__output, "\")");
       if (mt->plist)
 	{
-	  fprintf (stderr, "\n%s ", prefix);
+	  fprintf (mdebug__output, "\n%s ", prefix);
 	  dump_textplist (mt->plist, indent + 1);
 	}
     }
-  fprintf (stderr, ")");
+  fprintf (mdebug__output, ")");
   return mt;
 }
 
diff --git a/src/plist.c b/src/plist.c
index 05dd737..0c91268 100644
--- a/src/plist.c
+++ b/src/plist.c
@@ -526,7 +526,7 @@ read_element (MPlist *plist, MStream *st, MPlist *keys)
     if (MT)				\
       mtext_cat_char ((MT), (C));	\
     else				\
-      putc ((C), stderr);		\
+      putc ((C), mdebug__output);	\
   } while (0);
 
 #define PUTS(MT, STR)			\
@@ -534,7 +534,7 @@ read_element (MPlist *plist, MStream *st, MPlist *keys)
     if (MT)				\
       MTEXT_CAT_ASCII ((MT), (STR));	\
     else				\
-      fputs ((STR), stderr);		\
+      fputs ((STR), mdebug__output);	\
   } while (0)
 
 
@@ -654,7 +654,7 @@ write_element (MText *mt, MPlist *plist, int indent)
 	      unsigned char *end = data + mtext__char_to_byte (this_mt, stop);
 
 	      while (beg < end)
-		putc (*beg, stderr), beg++;
+		putc (*beg, mdebug__output), beg++;
 	    }
 	  if (stop == to)
 	    break;
@@ -680,7 +680,7 @@ write_element (MText *mt, MPlist *plist, int indent)
 	  M17N_OBJECT_UNREF (this_mt);
 	}
       else
-	fprintf (stderr, "%s", str);
+	fprintf (mdebug__output, "%s", str);
     }
   else 
     {
@@ -1640,16 +1640,18 @@ mplist_deserialize (MText *mt)
     @brief Dump a property list.
 
     The mdebug_dump_plist () function prints a property list $PLIST in
-    a human readable way to the stderr.  $INDENT specifies how many
-    columns to indent the lines but the first one.
+    a human readable way to the stderr or to what specified by the
+    environment variable MDEBUG_OUTPUT_FILE.  $INDENT specifies how
+    many columns to indent the lines but the first one.
 
     @return
     This function returns $PLIST.  */
 /***ja
     @brief ¥×¥í¥Ñ¥Æ¥£¥ê¥¹¥È¤ò¥À¥ó¥×¤¹¤ë.
 
-    ´Ø¿ô mdebug_dump_plist () ¤Ï¥×¥í¥Ñ¥Æ¥£¥ê¥¹¥È $PLIST ¤ò stderr 
-    ¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç°õºþ¤¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
+    ´Ø¿ô mdebug_dump_plist () ¤Ï¥×¥í¥Ñ¥Æ¥£¥ê¥¹¥È $PLIST ¤òɸ½à¥¨¥é¡¼½Ð
+    ÎϤ⤷¤¯¤Ï´Ä¶­ÊÑ¿ô MDEBUG_DUMP_FONT ¤Ç»ØÄꤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë¿Í´Ö¤Ë²Ä
+    ÆɤʷÁ¤Ç°õºþ¤¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
 
     @return
     ¤³¤Î´Ø¿ô¤Ï $PLIST ¤òÊÖ¤¹¡£  */
@@ -1662,14 +1664,14 @@ mdebug_dump_plist (MPlist *plist, int indent)
   memset (prefix, 32, indent);
   prefix[indent] = 0;
 
-  fprintf (stderr, "(");
+  fprintf (mdebug__output, "(");
   MPLIST_DO (pl, plist)
     {
       if (pl != plist)
-	fprintf (stderr, "\n%s ", prefix);
+	fprintf (mdebug__output, "\n%s ", prefix);
       write_element (NULL, pl, indent + 1);
     }
-  fprintf (stderr, ")");
+  fprintf (mdebug__output, ")");
   return plist;
 }
 
diff --git a/src/symbol.c b/src/symbol.c
index faf97fe..75ef4f1 100644
--- a/src/symbol.c
+++ b/src/symbol.c
@@ -180,7 +180,7 @@ msymbol__free_table ()
       symbol_table[i] = NULL;
     }
   if (mdebug__flags[MDEBUG_FINI])
-    fprintf (stderr, "%16s %7d %7d %7d\n", "Symbol",
+    fprintf (mdebug__output, "%16s %7d %7d %7d\n", "Symbol",
 	     num_symbols, freed_symbols, num_symbols - freed_symbols);
   num_symbols = 0;
 }
@@ -735,9 +735,10 @@ msymbol_get_func (MSymbol symbol, MSymbol key)
 /***en
     @brief Dump a symbol.
 
-    The mdebug_dump_symbol () function prints symbol $SYMBOL in a human
-    readable way to the stderr.  $INDENT specifies how many columns to
-    indent the lines but the first one.
+    The mdebug_dump_symbol () function prints symbol $SYMBOL in a
+    human readable way to the stderr or to what specified by the
+    environment variable MDEBUG_OUTPUT_FILE.  $INDENT specifies how
+    many columns to indent the lines but the first one.
 
     @return
     This function returns $SYMBOL.
@@ -747,8 +748,9 @@ msymbol_get_func (MSymbol symbol, MSymbol key)
 /***ja
     @brief ¥·¥ó¥Ü¥ë¤ò¥À¥ó¥×¤¹¤ë.
 
-    ´Ø¿ô mdebug_dump_symbol () ¤Ï¥·¥ó¥Ü¥ë $symbol ¤ò stderr 
-    ¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ¤Ç°õºþ¤¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
+    ´Ø¿ô mdebug_dump_symbol () ¤Ï¥·¥ó¥Ü¥ë $symbol ¤òɸ½à¥¨¥é¡¼½ÐÎϤ⤷
+    ¤¯¤Ï´Ä¶­ÊÑ¿ô MDEBUG_DUMP_FONT ¤Ç»ØÄꤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë¿Í´Ö¤Ë²ÄÆɤʷÁ
+    ¤Ç°õºþ¤¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
 
     @return
     ¤³¤Î´Ø¿ô¤Ï $SYMBOL ¤òÊÖ¤¹¡£ 
@@ -774,10 +776,10 @@ mdebug_dump_symbol (MSymbol symbol, int indent)
   else
     plist = &symbol->plist, name = symbol->name;
 
-  fprintf (stderr, "%s%s", prefix, name);
+  fprintf (mdebug__output, "%s%s", prefix, name);
   while (plist && MPLIST_KEY (plist) != Mnil)
     {
-      fprintf (stderr, ":%s", MPLIST_KEY (plist)->name);
+      fprintf (mdebug__output, ":%s", MPLIST_KEY (plist)->name);
       plist = MPLIST_NEXT (plist);
     }
   return symbol;
@@ -787,8 +789,9 @@ mdebug_dump_symbol (MSymbol symbol, int indent)
     @brief Dump all symbol names.
 
     The mdebug_dump_all_symbols () function prints names of all
-    symbols to the stderr.  $INDENT specifies how many columns to
-    indent the lines but the first one.
+    symbols to the stderr or to what specified by the environment
+    variable MDEBUG_OUTPUT_FILE.  $INDENT specifies how many columns
+    to indent the lines but the first one.
 
     @return
     This function returns #Mnil.
@@ -798,8 +801,9 @@ mdebug_dump_symbol (MSymbol symbol, int indent)
 /***ja
     @brief ¤¹¤Ù¤Æ¤Î¥·¥ó¥Ü¥ë̾¤ò¥À¥ó¥×¤¹¤ë.
 
-    ´Ø¿ô mdebug_dump_all_symbols () ¤Ï¡¢¤¹¤Ù¤Æ¤Î¥·¥ó¥Ü¥ë¤Î̾Á°¤ò 
-    stderr ¤Ë°õºþ¤¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
+    ´Ø¿ô mdebug_dump_all_symbols () ¤Ï¡¢¤¹¤Ù¤Æ¤Î¥·¥ó¥Ü¥ë¤Î̾Á°¤òɸ½à¥¨
+    ¥é¡¼½ÐÎϤ⤷¤¯¤Ï´Ä¶­ÊÑ¿ô MDEBUG_DUMP_FONT ¤Ç»ØÄꤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤Ë°õ
+    ºþ¤¹¤ë¡£ $INDENT ¤Ï£²¹ÔÌܰʹߤΥ¤¥ó¥Ç¥ó¥È¤ò»ØÄꤹ¤ë¡£
 
     @return
     ¤³¤Î´Ø¿ô¤Ï #Mnil ¤òÊÖ¤¹¡£ 
@@ -821,17 +825,17 @@ mdebug_dump_all_symbols (int indent)
   memset (prefix, 32, indent);
   prefix[indent] = 0;
 
-  fprintf (stderr, "(symbol-list");
+  fprintf (mdebug__output, "(symbol-list");
   for (i = n = 0; i < SYMBOL_TABLE_SIZE; i++)
     if ((sym = symbol_table[i]))
       {
-	fprintf (stderr, "\n%s  (%4d", prefix, i);
+	fprintf (mdebug__output, "\n%s  (%4d", prefix, i);
 	for (; sym; sym = sym->next, n++)
-	  fprintf (stderr, " '%s'", sym->name);
-	fprintf (stderr, ")");
+	  fprintf (mdebug__output, " '%s'", sym->name);
+	fprintf (mdebug__output, ")");
       }
-  fprintf (stderr, "\n%s  (total %d)", prefix, n);
-  fprintf (stderr, ")");
+  fprintf (mdebug__output, "\n%s  (total %d)", prefix, n);
+  fprintf (mdebug__output, ")");
   return Mnil;
 }
 
diff --git a/src/textprop.c b/src/textprop.c
index b7f14b9..4a39e9b 100644
--- a/src/textprop.c
+++ b/src/textprop.c
@@ -1127,16 +1127,16 @@ dump_interval (MInterval *interval, int indent)
   memset (prefix, 32, indent);
   prefix[indent] = 0;
 
-  fprintf (stderr, "(interval %d-%d (%d)", interval->start, interval->end,
-	   interval->nprops);
+  fprintf (mdebug__output, "(interval %d-%d (%d)",
+	   interval->start, interval->end, interval->nprops);
   for (i = 0; i < interval->nprops; i++)
-    fprintf (stderr, "\n%s (%d %d/%d %d-%d 0x%x)",
+    fprintf (mdebug__output, "\n%s (%d %d/%d %d-%d 0x%x)",
 	     prefix, i,
 	     interval->stack[i]->control.ref_count,
 	     interval->stack[i]->attach_count,
 	     interval->stack[i]->start, interval->stack[i]->end,
 	     (unsigned) interval->stack[i]->val);
-  fprintf (stderr, ")");
+  fprintf (mdebug__output, ")");
 }
 
 void
@@ -1147,31 +1147,33 @@ dump_textplist (MTextPlist *plist, int indent)
   memset (prefix, 32, indent);
   prefix[indent] = 0;
 
-  fprintf (stderr, "(properties");
+  fprintf (mdebug__output, "(properties");
   if (! plist)
-    fprintf (stderr, ")\n");
+    fprintf (mdebug__output, ")\n");
   else
     {
-      fprintf (stderr, "\n");
+      fprintf (mdebug__output, "\n");
       while (plist)
 	{
 	  MInterval *interval = plist->head;
 
-	  fprintf (stderr, "%s (%s", prefix, msymbol_name (plist->key));
+	  fprintf (mdebug__output, "%s (%s", prefix, msymbol_name (plist->key));
 	  while (interval)
 	    {
-	      fprintf (stderr, " (%d %d", interval->start, interval->end);
+	      fprintf (mdebug__output, " (%d %d",
+		       interval->start, interval->end);
 	      if (interval->nprops > 0)
 		{
 		  int i;
 
 		  for (i = 0; i < interval->nprops; i++)
-		    fprintf (stderr, " 0x%x", (int) interval->stack[i]->val);
+		    fprintf (mdebug__output, " 0x%x",
+			     (int) interval->stack[i]->val);
 		}
-	      fprintf (stderr, ")");
+	      fprintf (mdebug__output, ")");
 	      interval = interval->next;
 	    }
-	  fprintf (stderr, ")\n");
+	  fprintf (mdebug__output, ")\n");
 	  xassert (check_plist (plist, 0) == 0);
 	  plist = plist->next;
 	}