Port to 32-bit --with-wide-int

Prefer symbol indexes to struct Lisp_Symbol * casted and then
widened, as the latter had trouble with GCC on Fedora 21 when
configured --with-wide-int and when used in static initializers.
* lib-src/make-docfile.c (write_globals): Define and use symbols like
iQnil (a small integer, like 0) rather than aQnil (an address
constant).
* src/alloc.c (garbage_collect_1, which_symbols):
* src/lread.c (init_obarray):
Prefer builtin_lisp_symbol when it can be used.
* src/dispextern.h (struct image_type.type):
* src/font.c (font_property_table.key):
* src/frame.c (struct frame_parm_table.sym):
* src/keyboard.c (scroll_bar_parts, struct event_head):
* src/xdisp.c (struct props.name):
Use the index of a builtin symbol rather than its address.
All uses changed.
* src/lisp.h (TAG_SYMPTR, XSYMBOL_INIT): Remove, replacing with ...
(TAG_SYMOFFSET, SYMBOL_INDEX): ... new macros that deal with
symbol indexes rather than pointers, and which work better on MSB
hosts because they shift right before tagging.  All uses changed.
(DEFINE_LISP_SYMBOL_BEGIN, DEFINE_LISP_SYMBOL_END):
No longer noops on wide-int hosts, since they work now.
(builtin_lisp_symbol): New function.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 712c8f771f7..7c937332407 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -5630,7 +5630,7 @@ garbage_collect_1 (void *end)
   mark_buffer (&buffer_local_symbols);
 
   for (i = 0; i < ARRAYELTS (lispsym); i++)
-    mark_object (make_lisp_symbol (&lispsym[i]));
+    mark_object (builtin_lisp_symbol (i));
 
   for (i = 0; i < staticidx; i++)
     mark_object (*staticvec[i]);
@@ -7019,7 +7019,7 @@ which_symbols (Lisp_Object obj, EMACS_INT find_max)
      {
        for (int i = 0; i < ARRAYELTS (lispsym); i++)
 	 {
-	   Lisp_Object sym = make_lisp_symbol (&lispsym[i]);
+	   Lisp_Object sym = builtin_lisp_symbol (i);
 	   if (symbol_uses_obj (sym, obj))
 	     {
 	       found = Fcons (sym, found);