diff options
Diffstat (limited to '')
| -rw-r--r-- | m4/intdiv0.m4 | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/m4/intdiv0.m4 b/m4/intdiv0.m4 new file mode 100644 index 0000000..40dd43b --- /dev/null +++ b/m4/intdiv0.m4 @@ -0,0 +1,87 @@ +# intdiv0.m4 serial 6 (gettext-0.18.2) +dnl Copyright (C) 2002, 2007-2008, 2010-2019 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 "$gt_cv_int_divbyzero_sigfpe"; then + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#include <stdlib.h> +#include <signal.h> + +static void +sigfpe_handler (int sig) +{ + /* Exit with code 0 if SIGFPE, with code 1 if any other signal. */ + exit (sig != SIGFPE); +} + +int x = 1; +int y = 0; +int z; +int xnan; + +int main () +{ + signal (SIGFPE, sigfpe_handler); +/* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP. */ +#if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP) + signal (SIGTRAP, sigfpe_handler); +#endif +/* Linux/SPARC yields signal SIGILL. */ +#if defined (__sparc__) && defined (__linux__) + signal (SIGILL, sigfpe_handler); +#endif + + z = x / y; + xnan = y / y; + exit (2); +} +]])], + [gt_cv_int_divbyzero_sigfpe=yes], + [gt_cv_int_divbyzero_sigfpe=no], + [ + # Guess based on the CPU. +changequote(,)dnl + case "$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.]) +]) |