m4/cxx.m4

   1 # -*- Autoconf -*-
   2 # Sanity-test a C++ compiler.
   3 #
   4 # Copyright (C) 2004 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 2 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, write to the Free Software
  18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 # 02110-1301  USA
  20
  21 # Written by Paul Eggert <eggert@cs.ucla.edu>.
  22
  23 AC_DEFUN([BISON_TEST_FOR_WORKING_CXX_COMPILER],
  24 [
  25  AC_CACHE_CHECK([whether $CXX builds executables that work],
  26    bison_cv_cxx_works,
  27    [AC_LANG_PUSH([C++])
  28     AC_RUN_IFELSE(
  29       [AC_LANG_PROGRAM(
  30          [#include <iostream>
  31           using namespace std;],
  32          [std::cerr << "";
  33           cout << "";])],
  34       [bison_cv_cxx_works=yes],
  35       [bison_cv_cxx_works=no],
  36       [bison_cv_cxx_works=cross])
  37     AC_LANG_POP([C++])])
  38
  39  case $bison_cv_cxx_works in
  40  yes)
  41     BISON_CXX_WORKS=':';;
  42  no | cross)
  43     BISON_CXX_WORKS='exit 77';;
  44  esac
  45
  46  AC_SUBST([BISON_CXX_WORKS])
  47  AM_CONDITIONAL(BISON_CXX_WORKS, test $bison_cv_cxx_works = yes)
  48 ])