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, 2 insertions, 2 deletions

diff --git a/src/scroll.c b/src/scroll.c
index 78ebe65bdcc..79dd464b29e 100644
--- a/src/scroll.c
+++ b/src/scroll.c
@@ -195,13 +195,13 @@ calculate_scrolling (FRAME_PTR frame,
           {
             cost = p1->writecost + first_insert_cost[i];
             if ((int) p1->insertcount > i)
-              abort ();
+              emacs_abort ();
             cost1 = p1->insertcost + next_insert_cost[i - p1->insertcount];
           }
         p->insertcost = min (cost, cost1) + draw_cost[i] + extra_cost;
         p->insertcount = (cost < cost1) ? 1 : p1->insertcount + 1;
         if ((int) p->insertcount > i)
-          abort ();
+          emacs_abort ();
 
         /* Calculate the cost if we do a delete line after
            outputting this line.