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# 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; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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|
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dnl From Bruno Haible. |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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