mirror of git://gcc.gnu.org/git/gcc.git
73 lines
1.9 KiB
Plaintext
73 lines
1.9 KiB
Plaintext
# intdiv0.m4 serial 1 (gettext-0.11.3)
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dnl Copyright (C) 2002 Free Software Foundation, Inc.
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dnl This file is free software, distributed under the terms of the GNU
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dnl General Public License. As a special exception to the GNU General
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dnl Public License, this file may be distributed as part of a program
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dnl that contains a configuration script generated by Autoconf, under
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dnl the same distribution terms as the rest of that program.
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dnl From Bruno Haible.
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AC_DEFUN([gt_INTDIV0],
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[
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AC_REQUIRE([AC_PROG_CC])dnl
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AC_REQUIRE([AC_CANONICAL_HOST])dnl
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AC_CACHE_CHECK([whether integer division by zero raises SIGFPE],
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gt_cv_int_divbyzero_sigfpe,
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[
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AC_TRY_RUN([
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#include <stdlib.h>
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#include <signal.h>
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static void
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#ifdef __cplusplus
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sigfpe_handler (int sig)
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#else
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sigfpe_handler (sig) int sig;
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#endif
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{
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/* Exit with code 0 if SIGFPE, with code 1 if any other signal. */
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exit (sig != SIGFPE);
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}
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int x = 1;
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int y = 0;
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int z;
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int nan;
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int main ()
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{
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signal (SIGFPE, sigfpe_handler);
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/* IRIX and AIX (when "xlc -qcheck" is used) yield signal SIGTRAP. */
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#if (defined (__sgi) || defined (_AIX)) && defined (SIGTRAP)
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signal (SIGTRAP, sigfpe_handler);
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#endif
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/* Linux/SPARC yields signal SIGILL. */
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#if defined (__sparc__) && defined (__linux__)
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signal (SIGILL, sigfpe_handler);
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#endif
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z = x / y;
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nan = y / y;
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exit (1);
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}
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], gt_cv_int_divbyzero_sigfpe=yes, gt_cv_int_divbyzero_sigfpe=no,
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[
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# Guess based on the CPU.
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case "$host_cpu" in
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alpha* | i[34567]86 | m68k | s390*)
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gt_cv_int_divbyzero_sigfpe="guessing yes";;
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*)
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gt_cv_int_divbyzero_sigfpe="guessing no";;
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esac
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])
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])
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case "$gt_cv_int_divbyzero_sigfpe" in
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*yes) value=1;;
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*) value=0;;
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esac
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AC_DEFINE_UNQUOTED(INTDIV0_RAISES_SIGFPE, $value,
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[Define if integer division by zero raises signal SIGFPE.])
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])
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