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confuse 3.3

    1: # intdiv0.m4 serial 6 (gettext-0.18.2)
    2: dnl Copyright (C) 2002, 2007-2008, 2010-2013 Free Software Foundation, Inc.
    3: dnl This file is free software; the Free Software Foundation
    4: dnl gives unlimited permission to copy and/or distribute it,
    5: dnl with or without modifications, as long as this notice is preserved.
    6: 
    7: dnl From Bruno Haible.
    8: 
    9: AC_DEFUN([gt_INTDIV0],
   10: [
   11:   AC_REQUIRE([AC_PROG_CC])dnl
   12:   AC_REQUIRE([AC_CANONICAL_HOST])dnl
   13: 
   14:   AC_CACHE_CHECK([whether integer division by zero raises SIGFPE],
   15:     gt_cv_int_divbyzero_sigfpe,
   16:     [
   17:       gt_cv_int_divbyzero_sigfpe=
   18: changequote(,)dnl
   19:       case "$host_os" in
   20:         macos* | darwin[6-9]* | darwin[1-9][0-9]*)
   21:           # On Mac OS X 10.2 or newer, just assume the same as when cross-
   22:           # compiling. If we were to perform the real test, 1 Crash Report
   23:           # dialog window would pop up.
   24:           case "$host_cpu" in
   25:             i[34567]86 | x86_64)
   26:               gt_cv_int_divbyzero_sigfpe="guessing yes" ;;
   27:           esac
   28:           ;;
   29:       esac
   30: changequote([,])dnl
   31:       if test -z "$gt_cv_int_divbyzero_sigfpe"; then
   32:         AC_RUN_IFELSE(
   33:           [AC_LANG_SOURCE([[
   34: #include <stdlib.h>
   35: #include <signal.h>
   36: 
   37: static void
   38: sigfpe_handler (int sig)
   39: {
   40:   /* Exit with code 0 if SIGFPE, with code 1 if any other signal.  */
   41:   exit (sig != SIGFPE);
   42: }
   43: 
   44: int x = 1;
   45: int y = 0;
   46: int z;
   47: int nan;
   48: 
   49: int main ()
   50: {
   51:   signal (SIGFPE, sigfpe_handler);
   52: /* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP.  */
   53: #if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
   54:   signal (SIGTRAP, sigfpe_handler);
   55: #endif
   56: /* Linux/SPARC yields signal SIGILL.  */
   57: #if defined (__sparc__) && defined (__linux__)
   58:   signal (SIGILL, sigfpe_handler);
   59: #endif
   60: 
   61:   z = x / y;
   62:   nan = y / y;
   63:   exit (2);
   64: }
   65: ]])],
   66:           [gt_cv_int_divbyzero_sigfpe=yes],
   67:           [gt_cv_int_divbyzero_sigfpe=no],
   68:           [
   69:             # Guess based on the CPU.
   70: changequote(,)dnl
   71:             case "$host_cpu" in
   72:               alpha* | i[34567]86 | x86_64 | m68k | s390*)
   73:                 gt_cv_int_divbyzero_sigfpe="guessing yes";;
   74:               *)
   75:                 gt_cv_int_divbyzero_sigfpe="guessing no";;
   76:             esac
   77: changequote([,])dnl
   78:           ])
   79:       fi
   80:     ])
   81:   case "$gt_cv_int_divbyzero_sigfpe" in
   82:     *yes) value=1;;
   83:     *) value=0;;
   84:   esac
   85:   AC_DEFINE_UNQUOTED([INTDIV0_RAISES_SIGFPE], [$value],
   86:     [Define if integer division by zero raises signal SIGFPE.])
   87: ])