1# -*- Autoconf -*-
2# Sanity-test a C++ compiler.
3#
4# Copyright (C) 2004, 2006, 2009-2012 Free Software Foundation, Inc.
5#
6# This program is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10#
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15#
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <http://www.gnu.org/licenses/>.
18
19# Written by Paul Eggert.
20
21AC_DEFUN([BISON_TEST_FOR_WORKING_CXX_COMPILER],
22[
23 AC_CACHE_CHECK([whether $CXX builds executables that work],
24   bison_cv_cxx_works,
25   [AC_LANG_PUSH([C++])
26    bison_cv_cxx_works=no
27    AC_COMPILE_IFELSE(
28      [AC_LANG_PROGRAM(
29	 [#include <cstdlib>
30	  #include <iostream>
31	  #include <map>
32	  #include <string>
33	  using namespace std;],
34         [std::cerr << "";
35          cout << "";
36	  typedef std::pair<unsigned int, int> uipair;
37	  std::map<unsigned int, int> m;
38	  std::map<unsigned int, int>::iterator i;
39	  m.insert (uipair (4, -4));
40	  for (i = m.begin (); i != m.end (); ++i)
41	    if (i->first != 4)
42	      return 1;])],
43      [AS_IF([AC_TRY_COMMAND([$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_objext $LIBS >&AS_MESSAGE_LOG_FD])],
44	 [AS_IF([test "$cross_compiling" = yes],
45	    [bison_cv_cxx_works=cross],
46	    [AS_IF([AC_TRY_COMMAND(./conftest$ac_exeext)],
47	       [bison_cv_cxx_works=yes])])])
48       rm -f conftest$ac_exeext])
49    AC_LANG_POP([C++])])
50
51 case $bison_cv_cxx_works in
52 yes)
53    BISON_CXX_WORKS=':';;
54 no | cross)
55    BISON_CXX_WORKS='exit 77';;
56 esac
57
58 AC_SUBST([BISON_CXX_WORKS])
59 AM_CONDITIONAL(BISON_CXX_WORKS, test $bison_cv_cxx_works = yes)
60])
61
62# BISON_CXX_COMPILER_POSIXLY_CORRECT
63# ----------------------------------
64# Whether the C++ compiler supports -g in POSIXLY_CORRECT mode.
65AC_DEFUN([BISON_CXX_COMPILER_POSIXLY_CORRECT],
66[AC_LANG_PUSH([C++])
67BISON_LANG_COMPILER_POSIXLY_CORRECT
68AC_LANG_POP([C++])
69])
70