| 1 | # intdiv0.m4 serial 1 (gettext-0.11.3) |
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| 2 | dnl Copyright (C) 2002 Free Software Foundation, Inc. |
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| 3 | dnl This file is free software; the Free Software Foundation |
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| 4 | dnl gives unlimited permission to copy and/or distribute it, |
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| 5 | dnl with or without modifications, as long as this notice is preserved. |
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| 6 | |
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| 7 | dnl From Bruno Haible. |
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| 8 | |
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| 9 | AC_DEFUN([gt_INTDIV0], |
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| 10 | [ |
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| 11 | AC_REQUIRE([AC_PROG_CC])dnl |
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| 12 | AC_REQUIRE([AC_CANONICAL_HOST])dnl |
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| 13 | |
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| 14 | AC_CACHE_CHECK([whether integer division by zero raises SIGFPE], |
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| 15 | gt_cv_int_divbyzero_sigfpe, |
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| 16 | [ |
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| 17 | AC_TRY_RUN([ |
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| 18 | #include <stdlib.h> |
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| 19 | #include <signal.h> |
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| 20 | |
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| 21 | static void |
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| 22 | #ifdef __cplusplus |
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| 23 | sigfpe_handler (int sig) |
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| 24 | #else |
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| 25 | sigfpe_handler (sig) int sig; |
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| 26 | #endif |
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| 27 | { |
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| 28 | /* Exit with code 0 if SIGFPE, with code 1 if any other signal. */ |
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| 29 | exit (sig != SIGFPE); |
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| 30 | } |
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| 31 | |
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| 32 | int x = 1; |
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| 33 | int y = 0; |
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| 34 | int z; |
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| 35 | int nan; |
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| 36 | |
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| 37 | int main () |
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| 38 | { |
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| 39 | signal (SIGFPE, sigfpe_handler); |
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| 40 | /* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP. */ |
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| 41 | #if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP) |
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| 42 | signal (SIGTRAP, sigfpe_handler); |
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| 43 | #endif |
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| 44 | /* Linux/SPARC yields signal SIGILL. */ |
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| 45 | #if defined (__sparc__) && defined (__linux__) |
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| 46 | signal (SIGILL, sigfpe_handler); |
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| 47 | #endif |
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| 48 | |
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| 49 | z = x / y; |
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| 50 | nan = y / y; |
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| 51 | exit (1); |
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| 52 | } |
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| 53 | ], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no, |
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| 54 | [ |
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| 55 | # Guess based on the CPU. |
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| 56 | case "$host_cpu" in |
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| 57 | alpha* | i[34567]86 | m68k | s390*) |
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| 58 | gt_cv_int_divbyzero_sigfpe="guessing yes";; |
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| 59 | *) |
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| 60 | gt_cv_int_divbyzero_sigfpe="guessing no";; |
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| 61 | esac |
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| 62 | ]) |
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| 63 | ]) |
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| 64 | case "$gt_cv_int_divbyzero_sigfpe" in |
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| 65 | *yes) value=1;; |
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| 66 | *) value=0;; |
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| 67 | esac |
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| 68 | AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value, |
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| 69 | [Define if integer division by zero raises signal SIGFPE.]) |
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| 70 | ]) |
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