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Annotation of embedaddon/libiconv/srcm4/intdiv0.m4, revision 1.1

1.1     ! misho       1: # intdiv0.m4 serial 3 (gettext-0.18)
        !             2: dnl Copyright (C) 2002, 2007-2008 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 "$host_os" in
        !            20:         macos* | darwin[6-9]* | darwin[1-9][0-9]*)
        !            21:           # On MacOS X 10.2 or newer, just assume the same as when cross-
        !            22:           # compiling. If we were to perform the real test, 1 Crash Report
        !            23:           # dialog window would pop up.
        !            24:           case "$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 "$gt_cv_int_divbyzero_sigfpe"; then
        !            32:         AC_TRY_RUN([
        !            33: #include <stdlib.h>
        !            34: #include <signal.h>
        !            35: 
        !            36: static void
        !            37: sigfpe_handler (int sig)
        !            38: {
        !            39:   /* Exit with code 0 if SIGFPE, with code 1 if any other signal.  */
        !            40:   exit (sig != SIGFPE);
        !            41: }
        !            42: 
        !            43: int x = 1;
        !            44: int y = 0;
        !            45: int z;
        !            46: int nan;
        !            47: 
        !            48: int main ()
        !            49: {
        !            50:   signal (SIGFPE, sigfpe_handler);
        !            51: /* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP.  */
        !            52: #if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
        !            53:   signal (SIGTRAP, sigfpe_handler);
        !            54: #endif
        !            55: /* Linux/SPARC yields signal SIGILL.  */
        !            56: #if defined (__sparc__) && defined (__linux__)
        !            57:   signal (SIGILL, sigfpe_handler);
        !            58: #endif
        !            59: 
        !            60:   z = x / y;
        !            61:   nan = y / y;
        !            62:   exit (1);
        !            63: }
        !            64: ], [gt_cv_int_divbyzero_sigfpe=yes], [gt_cv_int_divbyzero_sigfpe=no],
        !            65:           [
        !            66:             # Guess based on the CPU.
        !            67: changequote(,)dnl
        !            68:             case "$host_cpu" in
        !            69:               alpha* | i[34567]86 | x86_64 | m68k | s390*)
        !            70:                 gt_cv_int_divbyzero_sigfpe="guessing yes";;
        !            71:               *)
        !            72:                 gt_cv_int_divbyzero_sigfpe="guessing no";;
        !            73:             esac
        !            74: changequote([,])dnl
        !            75:           ])
        !            76:       fi
        !            77:     ])
        !            78:   case "$gt_cv_int_divbyzero_sigfpe" in
        !            79:     *yes) value=1;;
        !            80:     *) value=0;;
        !            81:   esac
        !            82:   AC_DEFINE_UNQUOTED([INTDIV0_RAISES_SIGFPE], [$value],
        !            83:     [Define if integer division by zero raises signal SIGFPE.])
        !            84: ])