mirror of
https://review.haiku-os.org/buildtools
synced 2025-02-14 17:57:39 +01:00
65 lines
2.1 KiB
Plaintext
65 lines
2.1 KiB
Plaintext
|
dnl A function to check whether the C++ compiler provides long double
|
||
|
|
dnl numbers that have bigger range or precision than double.
|
||
|
|
dnl Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
|
||
|
|
dnl Copyright (C) 2010-2011 BUGSENG srl (http://bugseng.com)
|
||
|
|
dnl
|
||
|
|
dnl This file is part of the Parma Polyhedra Library (PPL).
|
||
|
|
dnl
|
||
|
|
dnl The PPL is free software; you can redistribute it and/or modify it
|
||
|
|
dnl under the terms of the GNU General Public License as published by the
|
||
|
|
dnl Free Software Foundation; either version 3 of the License, or (at your
|
||
|
|
dnl option) any later version.
|
||
|
|
dnl
|
||
|
|
dnl The PPL is distributed in the hope that it will be useful, but WITHOUT
|
||
|
|
dnl ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
|
dnl FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||
|
|
dnl for more details.
|
||
|
|
dnl
|
||
|
|
dnl You should have received a copy of the GNU General Public License
|
||
|
|
dnl along with this program; if not, write to the Free Software Foundation,
|
||
|
|
dnl Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
|
||
|
|
dnl
|
||
|
|
dnl For the most up-to-date information see the Parma Polyhedra Library
|
||
|
|
dnl site: http://www.cs.unipr.it/ppl/ .
|
||
|
|
dnl
|
||
|
|
AC_DEFUN([AC_CXX_PROVIDES_PROPER_LONG_DOUBLE],
|
||
|
|
[
|
||
|
|
ac_save_CPPFLAGS="$CPPFLAGS"
|
||
|
|
ac_save_LIBS="$LIBS"
|
||
|
|
AC_LANG_PUSH(C++)
|
||
|
|
|
||
|
|
AC_MSG_CHECKING([whether the C++ compiler provides proper long doubles])
|
||
|
|
AC_RUN_IFELSE([AC_LANG_SOURCE([[
|
||
|
|
#include <cfloat>
|
||
|
|
|
||
|
|
long double f = 0.0;
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
if ((LDBL_MAX <= DBL_MAX) && (DBL_EPSILON <= LDBL_EPSILON)
|
||
|
|
&& (LDBL_MAX_EXP <= DBL_MAX_EXP) && (LDBL_MANT_DIG <= DBL_MANT_DIG))
|
||
|
|
return 1;
|
||
|
|
else
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
]])],
|
||
|
|
AC_MSG_RESULT(yes)
|
||
|
|
ac_cxx_provides_proper_long_double=yes,
|
||
|
|
AC_MSG_RESULT(no)
|
||
|
|
ac_cxx_provides_proper_long_double=no,
|
||
|
|
AC_MSG_RESULT([assuming not])
|
||
|
|
ac_cxx_provides_proper_long_double=no)
|
||
|
|
|
||
|
|
if test x"$ac_cxx_provides_proper_long_double" = xyes
|
||
|
|
then
|
||
|
|
value=1
|
||
|
|
else
|
||
|
|
value=0
|
||
|
|
fi
|
||
|
|
AC_DEFINE_UNQUOTED(PPL_CXX_PROVIDES_PROPER_LONG_DOUBLE, $value,
|
||
|
|
[Not zero if the C++ compiler provides long double numbers that have bigger range or precision than double.])
|
||
|
|
|
||
|
|
AC_LANG_POP(C++)
|
||
|
|
CPPFLAGS="$ac_save_CPPFLAGS"
|
||
|
|
LIBS="$ac_save_LIBS"
|
||
|
|
])
|