Return to intdiv0.m4 CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / confuse / m4

Annotation of embedaddon/confuse/m4/intdiv0.m4, revision 1.1.1.1

1.1       misho       1: # intdiv0.m4 serial 1 (gettext-0.11.3)
                      2: dnl Copyright (C) 2002 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:       AC_TRY_RUN([
                     18: #include <stdlib.h>
                     19: #include <signal.h>
                     20: 
                     21: static void
                     22: #ifdef __cplusplus
                     23: sigfpe_handler (int sig)
                     24: #else
                     25: sigfpe_handler (sig) int sig;
                     26: #endif
                     27: {
                     28:   /* Exit with code 0 if SIGFPE, with code 1 if any other signal.  */
                     29:   exit (sig != SIGFPE);
                     30: }
                     31: 
                     32: int x = 1;
                     33: int y = 0;
                     34: int z;
                     35: int nan;
                     36: 
                     37: int main ()
                     38: {
                     39:   signal (SIGFPE, sigfpe_handler);
                     40: /* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP.  */
                     41: #if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
                     42:   signal (SIGTRAP, sigfpe_handler);
                     43: #endif
                     44: /* Linux/SPARC yields signal SIGILL.  */
                     45: #if defined (__sparc__) && defined (__linux__)
                     46:   signal (SIGILL, sigfpe_handler);
                     47: #endif
                     48: 
                     49:   z = x / y;
                     50:   nan = y / y;
                     51:   exit (1);
                     52: }
                     53: ], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no,
                     54:         [
                     55:           # Guess based on the CPU.
                     56:           case "$host_cpu" in
                     57:             alpha* | i[34567]86 | m68k | s390*)
                     58:               gt_cv_int_divbyzero_sigfpe="guessing yes";;
                     59:             *)
                     60:               gt_cv_int_divbyzero_sigfpe="guessing no";;
                     61:           esac
                     62:         ])
                     63:     ])
                     64:   case "$gt_cv_int_divbyzero_sigfpe" in
                     65:     *yes) value=1;;
                     66:     *) value=0;;
                     67:   esac
                     68:   AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value,
                     69:     [Define if integer division by zero raises signal SIGFPE.])
                     70: ])