ax_cxx_have_long_long_for_iostream.m4

# =======================================================================================
#  https://www.gnu.org/software/autoconf-archive/ax_cxx_have_long_long_for_iostream.html
# =======================================================================================
#
# SYNOPSIS
#
#   AX_CXX_HAVE_LONG_LONG_FOR_IOSTREAM
#
# DESCRIPTION
#
#   Check if the compiler allow long long for [i|o]stream Seems that OpenBSD
#   / gcc-3 don't have it.
#
#   Eg:
#
#     #include <iostream>
#     #ifdef HAVE_SSTREAM
#     #include <strstream>
#     #else
#     #include <sstream>
#     #endif
#     #ifdef HAVE_NAMESPACES
#     using namespace std;
#     #endif
#     ostream str((streambuf *)0);
#     long long lo=1;
#     str <<
#     #ifdef HAVE_LONG_LONG_FOR_IOSTREAM
#       (long int)
#     #endif
#             lo;
#
# LICENSE
#
#   Copyright (c) 2008 Alain BARBET <alian@cpan.org>
#
#   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 2 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 <https://www.gnu.org/licenses/>.
#
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#   gives unlimited permission to copy, distribute and modify the configure
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#   exception to the GPL to apply to your modified version as well.

#serial 7

AU_ALIAS([AC_CXX_HAVE_LONG_LONG_FOR_IOSTREAM], [AX_CXX_HAVE_LONG_LONG_FOR_IOSTREAM])
AC_DEFUN([AX_CXX_HAVE_LONG_LONG_FOR_IOSTREAM],
[AC_CACHE_CHECK(whether the compiler allow long long for [i|o]stream,
ax_cv_cxx_have_ll_for_iostream,
[AC_REQUIRE([AX_CXX_NAMESPACES])
  AC_REQUIRE([AX_CXX_HAVE_SSTREAM])
  AC_LANG_PUSH([C++])
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <iostream>
#ifdef HAVE_SSTREAM
#include <strstream>
#else
#include <sstream>
#endif
#ifdef HAVE_NAMESPACES
using namespace std;
#endif]], [[ostream str((streambuf *)0); long long l=1; str << l; return 0;]])],
  [ax_cv_cxx_have_ll_for_iostream=yes], [ax_cv_cxx_have_ll_for_iostream=no])
  AC_LANG_POP([C++])
])
if test "$ax_cv_cxx_have_ll_for_iostream" = yes; then
   AC_DEFINE(HAVE_LONG_LONG_FOR_IOSTREAM,,[define if the compiler allow long long for [i|o]stream])
fi
])