1 # intdiv0.m4 serial 1 (gettext-0.11.3) 2 dnl Copyright (C) 2002 Free Software Foundation, Inc. 3 dnl This file is free software, distributed under the terms of the GNU 4 dnl General Public License. As a special exception to the GNU General 5 dnl Public License, this file may be distributed as part of a program 6 dnl that contains a configuration script generated by Autoconf, under 7 dnl the same distribution terms as the rest of that program. 8 9 dnl From Bruno Haible. 10 11 AC_DEFUN([gt_INTDIV0], 12 [ 13 AC_REQUIRE([AC_PROG_CC])dnl 14 AC_REQUIRE([AC_CANONICAL_HOST])dnl 15 16 AC_CACHE_CHECK([whether integer division by zero raises SIGFPE], 17 gt_cv_int_divbyzero_sigfpe, 18 [ 19 AC_TRY_RUN([ 20 #include <stdlib.h> 21 #include <signal.h> 22 23 static void 24 #ifdef __cplusplus 25 sigfpe_handler (int sig) 26 #else 27 sigfpe_handler (sig) int sig; 28 #endif 29 { 30 /* Exit with code 0 if SIGFPE, with code 1 if any other signal. */ 31 exit (sig != SIGFPE); 32 } 33 34 int x = 1; 35 int y = 0; 36 int z; 37 int nan; 38 39 int main () 40 { 41 signal (SIGFPE, sigfpe_handler); 42 /* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP. */ 43 #if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP) 44 signal (SIGTRAP, sigfpe_handler); 45 #endif 46 /* Linux/SPARC yields signal SIGILL. */ 47 #if defined (__sparc__) && defined (__linux__) 48 signal (SIGILL, sigfpe_handler); 49 #endif 50 51 z = x / y; 52 nan = y / y; 53 exit (1); 54 } 55 ], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no, 56 [ 57 # Guess based on the CPU. 58 case "$host_cpu" in 59 alpha* | i[34567]86 | m68k | s390*) 60 gt_cv_int_divbyzero_sigfpe="guessing yes";; 61 *) 62 gt_cv_int_divbyzero_sigfpe="guessing no";; 63 esac 64 ]) 65 ]) 66 case "$gt_cv_int_divbyzero_sigfpe" in 67 *yes) value=1;; 68 *) value=0;; 69 esac 70 AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value, 71 [Define if integer division by zero raises signal SIGFPE.]) 72 ]) 73
