| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | # intdiv0.m4 serial 3 (gettext-0.18) |
| 2 | dnl Copyright (C) 2002, 2007-2010 Free Software Foundation, Inc. |
| 3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, |
| 5 | dnl with or without modifications, as long as this notice is preserved. |
| 6 | |
| 7 | dnl From Bruno Haible. |
| 8 | |
| 9 | AC_DEFUN([gt_INTDIV0], |
| 10 | [ |
| 11 | AC_REQUIRE([AC_PROG_CC])dnl |
| 12 | AC_REQUIRE([AC_CANONICAL_HOST])dnl |
| 13 | |
| 14 | AC_CACHE_CHECK([whether integer division by zero raises SIGFPE], |
| 15 | gt_cv_int_divbyzero_sigfpe, |
| 16 | [ |
| 17 | gt_cv_int_divbyzero_sigfpe= |
| 18 | changequote(,)dnl |
| 19 | case "$host_os" in |
| 20 | macos* | darwin[6-9]* | darwin[1-9][0-9]*) |
| 21 | # On MacOS X 10.2 or newer, just assume the same as when cross- |
| 22 | # compiling. If we were to perform the real test, 1 Crash Report |
| 23 | # dialog window would pop up. |
| 24 | case "$host_cpu" in |
| 25 | i[34567]86 | x86_64) |
| 26 | gt_cv_int_divbyzero_sigfpe="guessing yes" ;; |
| 27 | esac |
| 28 | ;; |
| 29 | esac |
| 30 | changequote([,])dnl |
| 31 | if test -z "$gt_cv_int_divbyzero_sigfpe"; then |
| 32 | AC_TRY_RUN([ |
| 33 | #include <stdlib.h> |
| 34 | #include <signal.h> |
| 35 | |
| 36 | static void |
| 37 | sigfpe_handler (int sig) |
| 38 | { |
| 39 | /* Exit with code 0 if SIGFPE, with code 1 if any other signal. */ |
| 40 | exit (sig != SIGFPE); |
| 41 | } |
| 42 | |
| 43 | int x = 1; |
| 44 | int y = 0; |
| 45 | int z; |
| 46 | int nan; |
| 47 | |
| 48 | int main () |
| 49 | { |
| 50 | signal (SIGFPE, sigfpe_handler); |
| 51 | /* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP. */ |
| 52 | #if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP) |
| 53 | signal (SIGTRAP, sigfpe_handler); |
| 54 | #endif |
| 55 | /* Linux/SPARC yields signal SIGILL. */ |
| 56 | #if defined (__sparc__) && defined (__linux__) |
| 57 | signal (SIGILL, sigfpe_handler); |
| 58 | #endif |
| 59 | |
| 60 | z = x / y; |
| 61 | nan = y / y; |
| 62 | exit (1); |
| 63 | } |
| 64 | ], [gt_cv_int_divbyzero_sigfpe=yes], [gt_cv_int_divbyzero_sigfpe=no], |
| 65 | [ |
| 66 | # Guess based on the CPU. |
| 67 | changequote(,)dnl |
| 68 | case "$host_cpu" in |
| 69 | alpha* | i[34567]86 | x86_64 | m68k | s390*) |
| 70 | gt_cv_int_divbyzero_sigfpe="guessing yes";; |
| 71 | *) |
| 72 | gt_cv_int_divbyzero_sigfpe="guessing no";; |
| 73 | esac |
| 74 | changequote([,])dnl |
| 75 | ]) |
| 76 | fi |
| 77 | ]) |
| 78 | case "$gt_cv_int_divbyzero_sigfpe" in |
| 79 | *yes) value=1;; |
| 80 | *) value=0;; |
| 81 | esac |
| 82 | AC_DEFINE_UNQUOTED([INTDIV0_RAISES_SIGFPE], [$value], |
| 83 | [Define if integer division by zero raises signal SIGFPE.]) |
| 84 | ]) |