projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 88fa57d7 KC |
1 | # intdiv0.m4 serial 1 (gettext-0.11.3) |
| 2 | dnl Copyright (C) 2002 Free Software Foundation, Inc. | |
| 3 | dnl This file is free software, distributed under the terms of the GNU | |
| 4 | dnl General Public License. As a special exception to the GNU General | |
| 5 | dnl Public License, this file may be distributed as part of a program | |
| 6 | dnl that contains a configuration script generated by Autoconf, under | |
| 7 | dnl the same distribution terms as the rest of that program. | |
| 8 | ||
| 9 | dnl From Bruno Haible. | |
| 10 | ||
| 11 | AC_DEFUN([gt_INTDIV0], | |
| 12 | [ | |
| 13 | AC_REQUIRE([AC_PROG_CC])dnl | |
| 14 | AC_REQUIRE([AC_CANONICAL_HOST])dnl | |
| 15 | ||
| 16 | AC_CACHE_CHECK([whether integer division by zero raises SIGFPE], | |
| 17 | gt_cv_int_divbyzero_sigfpe, | |
| 18 | [ | |
| 19 | AC_TRY_RUN([ | |
| 20 | #include <stdlib.h> | |
| 21 | #include <signal.h> | |
| 22 | ||
| 23 | static void | |
| 24 | #ifdef __cplusplus | |
| 25 | sigfpe_handler (int sig) | |
| 26 | #else | |
| 27 | sigfpe_handler (sig) int sig; | |
| 28 | #endif | |
| 29 | { | |
| 30 | /* Exit with code 0 if SIGFPE, with code 1 if any other signal. */ | |
| 31 | exit (sig != SIGFPE); | |
| 32 | } | |
| 33 | ||
| 34 | int x = 1; | |
| 35 | int y = 0; | |
| 36 | int z; | |
| 37 | int nan; | |
| 38 | ||
| 39 | int main () | |
| 40 | { | |
| 41 | signal (SIGFPE, sigfpe_handler); | |
| 42 | /* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP. */ | |
| 43 | #if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP) | |
| 44 | signal (SIGTRAP, sigfpe_handler); | |
| 45 | #endif | |
| 46 | /* Linux/SPARC yields signal SIGILL. */ | |
| 47 | #if defined (__sparc__) && defined (__linux__) | |
| 48 | signal (SIGILL, sigfpe_handler); | |
| 49 | #endif | |
| 50 | ||
| 51 | z = x / y; | |
| 52 | nan = y / y; | |
| 53 | exit (1); | |
| 54 | } | |
| 55 | ], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no, | |
| 56 | [ | |
| 57 | # Guess based on the CPU. | |
| 58 | case "$host_cpu" in | |
| 59 | alpha* | i[34567]86 | m68k | s390*) | |
| 60 | gt_cv_int_divbyzero_sigfpe="guessing yes";; | |
| 61 | *) | |
| 62 | gt_cv_int_divbyzero_sigfpe="guessing no";; | |
| 63 | esac | |
| 64 | ]) | |
| 65 | ]) | |
| 66 | case "$gt_cv_int_divbyzero_sigfpe" in | |
| 67 | *yes) value=1;; | |
| 68 | *) value=0;; | |
| 69 | esac | |
| 70 | AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value, | |
| 71 | [Define if integer division by zero raises signal SIGFPE.]) | |
| 72 | ]) |