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Annotation of embedaddon/libiconv/srcm4/intdiv0.m4, revision 1.1.1.1

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: ])