Simplify redefinition of 'abort' (Bug#12316).

Do not try to redefine the 'abort' function.  Instead, redo
the code so that it calls 'emacs_abort' rather than 'abort'.
This removes the need for the NO_ABORT configure-time macro
and makes it easier to change the abort code to do a backtrace.
* configure.ac (NO_ABRT): Remove.
* admin/CPP-DEFINES (NO_ABORT): Remove.
* nt/inc/ms-w32.h (w32_abort) [HAVE_NTGUI]: Remove.
* src/.gdbinit: Just stop at emacs_abort, not at w32_abort or abort.
* src/emacs.c (abort) [!DOS_NT && !NO_ABORT]:
Remove; sysdep.c's emacs_abort now takes its place.
* src/lisp.h (emacs_abort): New decl.  All calls from Emacs code to
'abort' changed to use 'emacs_abort'.
* src/msdos.c (dos_abort) [defined abort]: Remove; not used.
(abort) [!defined abort]: Rename to ...
(emacs_abort): ... new name.
* src/sysdep.c (emacs_abort) [!HAVE_NTGUI]: New function, taking
the place of the old 'abort' in emacs.c.
* src/w32.c, src/w32fns.c (abort): Do not #undef.
* src/w32.c (emacs_abort): Rename from w32_abort.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/window.c b/src/window.c
index 38124cb13a9..08608e0d451 100644
--- a/src/window.c
+++ b/src/window.c
@@ -386,7 +386,7 @@ the first window of that frame.  */)
       else if (! NILP (XWINDOW (window)->vchild))
         window = XWINDOW (window)->vchild;
       else
-        abort ();
+        emacs_abort ();
     }
 
   return window;
@@ -1289,7 +1289,7 @@ If they are in the windows's left or right marginal areas, `left-margin'\n\
       return Qnil;
 
     default:
-      abort ();
+      emacs_abort ();
     }
 }
 
@@ -1948,7 +1948,7 @@ unshow_buffer (register struct window *w)
   buf = w->buffer;
   b = XBUFFER (buf);
   if (b != XMARKER (w->pointm)->buffer)
-    abort ();
+    emacs_abort ();
 
 #if 0
   if (w == XWINDOW (selected_window)
@@ -2669,7 +2669,7 @@ window_loop (enum window_loop type, Lisp_Object obj, int mini, Lisp_Object frame
           case CHECK_ALL_WINDOWS:
             if (! NILP (w->buffer)
                 && NILP (BVAR (XBUFFER (w->buffer), name)))
-              abort ();
+              emacs_abort ();
             break;
 
           case WINDOW_LOOP_UNUSED: