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Annotation of embedaddon/confuse/m4/intdiv0.m4, revision 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: ])