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* these are dependencies for gcc 4 Graphite engine build. * CLooG 0.18.0 includes ISL 0.11.1 which is the backend that the build script enables. * PPL is needed by GCC build even if it isn't the chosen backend.
134 lines
3.1 KiB
Plaintext
134 lines
3.1 KiB
Plaintext
dnl A function to check whether the IEEE inexact flag is supported and
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dnl available to C++ programs.
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dnl Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
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dnl Copyright (C) 2010-2011 BUGSENG srl (http://bugseng.com)
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dnl
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dnl This file is part of the Parma Polyhedra Library (PPL).
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dnl
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dnl The PPL is free software; you can redistribute it and/or modify it
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dnl under the terms of the GNU General Public License as published by the
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dnl Free Software Foundation; either version 3 of the License, or (at your
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dnl option) any later version.
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dnl
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dnl The PPL is distributed in the hope that it will be useful, but WITHOUT
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dnl ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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dnl FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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dnl for more details.
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dnl
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dnl You should have received a copy of the GNU General Public License
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dnl along with this program; if not, write to the Free Software Foundation,
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dnl Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
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dnl
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dnl For the most up-to-date information see the Parma Polyhedra Library
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dnl site: http://www.cs.unipr.it/ppl/ .
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AC_DEFUN([AC_CXX_SUPPORTS_IEEE_INEXACT_FLAG],
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[
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ac_save_CPPFLAGS="$CPPFLAGS"
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ac_save_LIBS="$LIBS"
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AC_LANG_PUSH(C++)
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AC_MSG_CHECKING([whether the IEEE inexact flag is supported in C++])
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AC_RUN_IFELSE([AC_LANG_SOURCE([[
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#if defined(__i386__) && (defined(__GNUC__) || defined(__INTEL_COMPILER))
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int
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main() {
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return 0;
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}
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#elif defined(PPL_HAVE_IEEEFP_H) \
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&& (defined(__sparc) \
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|| defined(sparc) \
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|| defined(__sparc__))
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int
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main() {
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return 0;
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}
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#elif !defined(HAVE_FENV_H)
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int
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main() {
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return 1;
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}
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#else
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#include <fenv.h>
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#if !defined(FE_INEXACT)
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int
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main() {
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return 1;
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}
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#else // defined(FE_INEXACT)
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struct A {
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double dividend;
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double divisor;
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bool inexact;
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} a[] = {
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{ 1.0, 2.0, false },
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{ 2.0, 3.0, true },
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};
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int main() {
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for (unsigned i = 0; i < sizeof(a)/sizeof(a[0]); ++i) {
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{
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volatile float x = a[i].dividend;
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volatile float y = a[i].divisor;
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feclearexcept(FE_INEXACT);
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x = x / y;
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if ((fetestexcept(FE_INEXACT) != 0) != a[i].inexact)
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return 1;
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}
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{
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volatile double x = a[i].dividend;
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volatile double y = a[i].divisor;
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feclearexcept(FE_INEXACT);
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x = x / y;
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if ((fetestexcept(FE_INEXACT) != 0) != a[i].inexact)
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return 1;
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}
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{
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volatile long double x = a[i].dividend;
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volatile long double y = a[i].divisor;
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feclearexcept(FE_INEXACT);
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x = x / y;
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if ((fetestexcept(FE_INEXACT) != 0) != a[i].inexact)
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return 1;
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}
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}
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return 0;
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}
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#endif // defined(FE_INEXACT)
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#endif
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]])],
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AC_MSG_RESULT(yes)
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ac_cxx_supports_ieee_inexact_flag=yes,
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AC_MSG_RESULT(no)
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ac_cxx_supports_ieee_inexact_flag=no,
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AC_MSG_RESULT([assuming not])
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ac_cxx_supports_ieee_inexact_flag=no)
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if test x"$ac_cxx_supports_ieee_inexact_flag" = xyes
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then
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value=1
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else
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value=0
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fi
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AC_DEFINE_UNQUOTED(PPL_CXX_SUPPORTS_IEEE_INEXACT_FLAG, $value,
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[Not zero if the the IEEE inexact flag is supported in C++.])
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AC_LANG_POP(C++)
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CPPFLAGS="$ac_save_CPPFLAGS"
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LIBS="$ac_save_LIBS"
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])
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