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# -*- Autoconf -*-
# Sanity-test a C++ compiler.
#
# Copyright (C) 2004, 2006, 2009-2010 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Written by Paul Eggert.
AC_DEFUN([BISON_TEST_FOR_WORKING_CXX_COMPILER],
[
AC_CACHE_CHECK([whether $CXX builds executables that work],
bison_cv_cxx_works,
[AC_LANG_PUSH([C++])
bison_cv_cxx_works=no
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[#include <cstdlib>
#include <iostream>
#include <map>
#include <string>
using namespace std;],
[std::cerr << "";
cout << "";
typedef std::pair<unsigned int, int> uipair;
std::map<unsigned int, int> m;
std::map<unsigned int, int>::iterator i;
m.insert (uipair (4, -4));
for (i = m.begin (); i != m.end (); ++i)
if (i->first != 4)
return 1;])],
[AS_IF([AC_TRY_COMMAND([$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD])],
[AS_IF([test "$cross_compiling" = yes],
[bison_cv_cxx_works=cross],
[AS_IF([AC_TRY_COMMAND(./conftest$ac_exeext)],
[bison_cv_cxx_works=yes])])])
rm -f conftest$ac_exeext])
AC_LANG_POP([C++])])
case $bison_cv_cxx_works in
yes)
BISON_CXX_WORKS=':';;
no | cross)
BISON_CXX_WORKS='exit 77';;
esac
AC_SUBST([BISON_CXX_WORKS])
AM_CONDITIONAL(BISON_CXX_WORKS, test $bison_cv_cxx_works = yes)
])
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