* syntax.c (init_syntax_once): Adjust comment and do an early

initialization of Qchar_table_extra_slots just once...
* casetab.c (init_casetab_once):
* category.c (init_category_once):
* character.c (syms_of_character):
* coding.c (syms_of_coding):
* xdisp.c (syms_of_xdisp): ...and omit it here.

src/ChangeLog

+2013-08-26  Dmitry Antipov  <dmantipov@yandex.ru>
+
+	* syntax.c (init_syntax_once): Adjust comment and do an early
+	initialization of Qchar_table_extra_slots just once...
+	* casetab.c (init_casetab_once):
+	* category.c (init_category_once):
+	* character.c (syms_of_character):
+	* coding.c (syms_of_coding):
+	* xdisp.c (syms_of_xdisp): ...and omit it here.
+
 2013-08-24  Eli Zaretskii  <eliz@gnu.org>
 
 	* xdisp.c (get_next_display_element): Don't apply to characters

src/casetab.c

@@ -247,15 +247,8 @@ init_casetab_once (void)
 {
   register int i;
   Lisp_Object down, up, eqv;
-  DEFSYM (Qcase_table, "case-table");
-
-  /* Intern this now in case it isn't already done.
-     Setting this variable twice is harmless.
-     But don't staticpro it here--that is done in alloc.c.  */
-  Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots");
 
-  /* Now we are ready to set up this property, so we can
-     create char tables.  */
+  DEFSYM (Qcase_table, "case-table");
   Fput (Qcase_table, Qchar_table_extra_slots, make_number (3));
 
   down = Fmake_char_table (Qcase_table, Qnil);

src/category.c

@@ -460,14 +460,6 @@ init_category_once (void)
 {
   /* This has to be done here, before we call Fmake_char_table.  */
   DEFSYM (Qcategory_table, "category-table");
-
-  /* Intern this now in case it isn't already done.
-     Setting this variable twice is harmless.
-     But don't staticpro it here--that is done in alloc.c.  */
-  Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots");
-
-  /* Now we are ready to set up this property, so we can
-     create category tables.  */
   Fput (Qcategory_table, Qchar_table_extra_slots, make_number (2));
 
   Vstandard_category_table = Fmake_char_table (Qcategory_table, Qnil);

src/character.c

@@ -1072,10 +1072,6 @@ A char-table for width (columns) of each character.  */);
 	       doc: /* Char table of script symbols.
 It has one extra slot whose value is a list of script symbols.  */);
 
-  /* Intern this now in case it isn't already done.
-     Setting this variable twice is harmless.
-     But don't staticpro it here--that is done in alloc.c.  */
-  Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots");
   DEFSYM (Qchar_script_table, "char-script-table");
   Fput (Qchar_script_table, Qchar_table_extra_slots, make_number (1));
   Vchar_script_table = Fmake_char_table (Qchar_script_table, Qnil);

src/coding.c

@@ -10814,11 +10814,6 @@ syms_of_coding (void)
   Fput (Qcoding_system_error, Qerror_message,
 	build_pure_c_string ("Invalid coding system"));
 
-  /* Intern this now in case it isn't already done.
-     Setting this variable twice is harmless.
-     But don't staticpro it here--that is done in alloc.c.  */
-  Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots");
-
   DEFSYM (Qtranslation_table, "translation-table");
   Fput (Qtranslation_table, Qchar_table_extra_slots, make_number (2));
   DEFSYM (Qtranslation_table_id, "translation-table-id");

src/syntax.c

@@ -3486,9 +3486,9 @@ init_syntax_once (void)
   /* This has to be done here, before we call Fmake_char_table.  */
   DEFSYM (Qsyntax_table, "syntax-table");
 
-  /* Intern_C_String this now in case it isn't already done.
-     Setting this variable twice is harmless.
-     But don't staticpro it here--that is done in alloc.c.  */
+  /* This variable is DEFSYMed in alloc.c and not initialized yet, so
+     intern it here.  NOTE: you must guarantee that init_syntax_once
+     is called before all other users of this variable.  */
   Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots");
 
   /* Create objects which can be shared among syntax tables.  */

src/xdisp.c

@@ -29731,10 +29731,6 @@ cursor shapes.  */);
   DEFSYM (Qzero_width, "zero-width");
   DEFSYM (Qglyphless_char_display, "glyphless-char-display");
-  /* Intern this now in case it isn't already done.
-     Setting this variable twice is harmless.
-     But don't staticpro it here--that is done in alloc.c.  */
-  Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots");
   Fput (Qglyphless_char_display, Qchar_table_extra_slots, make_number (1));
   DEFVAR_LISP ("glyphless-char-display", Vglyphless_char_display,