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Annotation of embedaddon/confuse/m4/intdiv0.m4, revision 1.1.1.2

1.1.1.2 ! misho       1: # intdiv0.m4 serial 6 (gettext-0.18.2)
        !             2: dnl Copyright (C) 2002, 2007-2008, 2010-2013 Free Software Foundation, Inc.
1.1       misho       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:     [
1.1.1.2 ! misho      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 "$gt_cv_int_divbyzero_sigfpe"; then
        !            32:         AC_RUN_IFELSE(
        !            33:           [AC_LANG_SOURCE([[
1.1       misho      34: #include <stdlib.h>
                     35: #include <signal.h>
                     36: 
                     37: static void
                     38: sigfpe_handler (int sig)
                     39: {
                     40:   /* Exit with code 0 if SIGFPE, with code 1 if any other signal.  */
                     41:   exit (sig != SIGFPE);
                     42: }
                     43: 
                     44: int x = 1;
                     45: int y = 0;
                     46: int z;
                     47: int nan;
                     48: 
                     49: int main ()
                     50: {
                     51:   signal (SIGFPE, sigfpe_handler);
                     52: /* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP.  */
                     53: #if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
                     54:   signal (SIGTRAP, sigfpe_handler);
                     55: #endif
                     56: /* Linux/SPARC yields signal SIGILL.  */
                     57: #if defined (__sparc__) && defined (__linux__)
                     58:   signal (SIGILL, sigfpe_handler);
                     59: #endif
                     60: 
                     61:   z = x / y;
                     62:   nan = y / y;
1.1.1.2 ! misho      63:   exit (2);
1.1       misho      64: }
1.1.1.2 ! misho      65: ]])],
        !            66:           [gt_cv_int_divbyzero_sigfpe=yes],
        !            67:           [gt_cv_int_divbyzero_sigfpe=no],
        !            68:           [
        !            69:             # Guess based on the CPU.
        !            70: changequote(,)dnl
        !            71:             case "$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
1.1       misho      80:     ])
                     81:   case "$gt_cv_int_divbyzero_sigfpe" in
                     82:     *yes) value=1;;
                     83:     *) value=0;;
                     84:   esac
1.1.1.2 ! misho      85:   AC_DEFINE_UNQUOTED([INTDIV0_RAISES_SIGFPE], [$value],
1.1       misho      86:     [Define if integer division by zero raises signal SIGFPE.])
                     87: ])