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