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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [config/] [intdiv0.m4] - Blame information for rev 816

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1 38 julius
# intdiv0.m4 serial 1 (gettext-0.11.3)
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dnl Copyright (C) 2002 Free Software Foundation, Inc.
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dnl This file is free software, distributed under the terms of the GNU
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dnl General Public License.  As a special exception to the GNU General
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dnl Public License, this file may be distributed as part of a program
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dnl that contains a configuration script generated by Autoconf, under
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dnl the same distribution terms as the rest of that program.
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dnl From Bruno Haible.
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AC_DEFUN([gt_INTDIV0],
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[
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  AC_REQUIRE([AC_PROG_CC])dnl
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  AC_REQUIRE([AC_CANONICAL_HOST])dnl
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  AC_CACHE_CHECK([whether integer division by zero raises SIGFPE],
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    gt_cv_int_divbyzero_sigfpe,
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    [
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      AC_TRY_RUN([
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#include <stdlib.h>
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#include <signal.h>
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static void
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#ifdef __cplusplus
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sigfpe_handler (int sig)
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#else
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sigfpe_handler (sig) int sig;
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#endif
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{
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  /* Exit with code 0 if SIGFPE, with code 1 if any other signal.  */
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  exit (sig != SIGFPE);
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}
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int x = 1;
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int y = 0;
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int z;
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int nan;
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int main ()
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{
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  signal (SIGFPE, sigfpe_handler);
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/* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP.  */
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#if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
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  signal (SIGTRAP, sigfpe_handler);
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#endif
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/* Linux/SPARC yields signal SIGILL.  */
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#if defined (__sparc__) && defined (__linux__)
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  signal (SIGILL, sigfpe_handler);
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#endif
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  z = x / y;
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  nan = y / y;
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  exit (1);
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}
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], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no,
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        [
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          # Guess based on the CPU.
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          case "$host_cpu" in
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            alpha* | i[34567]86 | m68k | s390*)
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              gt_cv_int_divbyzero_sigfpe="guessing yes";;
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            *)
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              gt_cv_int_divbyzero_sigfpe="guessing no";;
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          esac
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        ])
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    ])
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  case "$gt_cv_int_divbyzero_sigfpe" in
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    *yes) value=1;;
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    *) value=0;;
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  esac
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  AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value,
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    [Define if integer division by zero raises signal SIGFPE.])
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])

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