| 1 | # intdiv0.m4 serial 1 (gettext-0.11.3)
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| 2 | dnl Copyright (C) 2002 Free Software Foundation, Inc.
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| 3 | dnl This file is free software, distributed under the terms of the GNU
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| 4 | dnl General Public License. As a special exception to the GNU General
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| 5 | dnl Public License, this file may be distributed as part of a program
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| 6 | dnl that contains a configuration script generated by Autoconf, under
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| 7 | dnl the same distribution terms as the rest of that program.
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| 8 |
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| 9 | dnl From Bruno Haible.
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| 10 |
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| 11 | AC_DEFUN([gt_INTDIV0],
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| 12 | [
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| 13 | AC_REQUIRE([AC_PROG_CC])dnl
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| 14 | AC_REQUIRE([AC_CANONICAL_HOST])dnl
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| 15 |
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| 16 | AC_CACHE_CHECK([whether integer division by zero raises SIGFPE],
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| 17 | gt_cv_int_divbyzero_sigfpe,
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| 18 | [
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| 19 | AC_TRY_RUN([
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| 20 | #include <stdlib.h>
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| 21 | #include <signal.h>
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| 22 |
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| 23 | static void
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| 24 | #ifdef __cplusplus
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| 25 | sigfpe_handler (int sig)
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| 26 | #else
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| 27 | sigfpe_handler (sig) int sig;
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| 28 | #endif
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| 29 | {
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| 30 | /* Exit with code 0 if SIGFPE, with code 1 if any other signal. */
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| 31 | exit (sig != SIGFPE);
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| 32 | }
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| 33 |
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| 34 | int x = 1;
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| 35 | int y = 0;
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| 36 | int z;
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| 37 | int nan;
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| 38 |
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| 39 | int main ()
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| 40 | {
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| 41 | signal (SIGFPE, sigfpe_handler);
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| 42 | /* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP. */
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| 43 | #if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
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| 44 | signal (SIGTRAP, sigfpe_handler);
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| 45 | #endif
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| 46 | /* Linux/SPARC yields signal SIGILL. */
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| 47 | #if defined (__sparc__) && defined (__linux__)
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| 48 | signal (SIGILL, sigfpe_handler);
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| 49 | #endif
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| 50 |
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| 51 | z = x / y;
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| 52 | nan = y / y;
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| 53 | exit (1);
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| 54 | }
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| 55 | ], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no,
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| 56 | [
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| 57 | # Guess based on the CPU.
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| 58 | case "$host_cpu" in
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| 59 | alpha* | i[34567]86 | m68k | s390*)
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| 60 | gt_cv_int_divbyzero_sigfpe="guessing yes";;
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| 61 | *)
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| 62 | gt_cv_int_divbyzero_sigfpe="guessing no";;
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| 63 | esac
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| 64 | ])
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| 65 | ])
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| 66 | case "$gt_cv_int_divbyzero_sigfpe" in
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| 67 | *yes) value=1;;
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| 68 | *) value=0;;
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| 69 | esac
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| 70 | AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value,
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| 71 | [Define if integer division by zero raises signal SIGFPE.])
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| 72 | ])
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