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intdiv0.m4
# intdiv0.m4 serial 6 (gettext-0.18.2) dnl Copyright (C) 2002, 2007-2008, 2010-2016 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. 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, [ gt_cv_int_divbyzero_sigfpe= changequote(,)dnl case "$host_os" in macos* | darwin[6-9]* | darwin[1-9][0-9]*) # On Mac OS X 10.2 or newer, just assume the same as when cross- # compiling. If we were to perform the real test, 1 Crash Report # dialog window would pop up. case "$host_cpu" in i[34567]86 | x86_64) gt_cv_int_divbyzero_sigfpe="guessing yes" ;; esac ;; esac changequote([,])dnl if test -z "$gt_cv_int_divbyzero_sigfpe"; then AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <stdlib.h> #include <signal.h> static void sigfpe_handler (int sig) { /* Exit with code 0 if SIGFPE, with code 1 if any other signal. */ _exit (sig != SIGFPE); } int x = 1; int y = 0; int z; int nan; int main () { signal (SIGFPE, sigfpe_handler); /* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP. */ #if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP) signal (SIGTRAP, sigfpe_handler); #endif /* Linux/SPARC yields signal SIGILL. */ #if defined (__sparc__) && defined (__linux__) signal (SIGILL, sigfpe_handler); #endif z = x / y; nan = y / y; exit (2); } ]])], [gt_cv_int_divbyzero_sigfpe=yes], [gt_cv_int_divbyzero_sigfpe=no], [ # Guess based on the CPU. changequote(,)dnl case "$host_cpu" in alpha* | i[34567]86 | x86_64 | m68k | s390*) gt_cv_int_divbyzero_sigfpe="guessing yes";; *) gt_cv_int_divbyzero_sigfpe="guessing no";; esac changequote([,])dnl ]) fi ]) 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.]) ])
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