#                                                            -*- Autoconf -*-
# m4-obstack.m4 -- the libc supplied version of obstacks if available.
#
# Copyright (C) 2000-2001, 2003-2004, 2006-2007, 2010, 2013 Free
# Software Foundation, Inc.
# Written by Gary V. Vaughan <gary@gnu.org>
#
# This file is part of GNU M4.
#
# GNU M4 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.
#
# GNU M4 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/>.

# serial 10

# M4_OBSTACK
# ----------
# Use the libc supplied version of obstacks if available.
AC_DEFUN([M4_OBSTACK],
[AC_PREREQ([2.56])dnl We use the compiler based header checking in 2.56
AC_BEFORE([gl_OBSTACK], [M4_OBSTACK])
AC_ARG_WITH([included-obstack],
    [AS_HELP_STRING([--with-included-obstack],
                    [use the obstack implementation included here])])

AC_CHECK_HEADERS([obstack.h], [], [], [AC_INCLUDES_DEFAULT])

if test "x${with_included_obstack-no}" != xno; then
  ac_cv_func_obstack=no
fi

OBSTACK_H=
if test $ac_cv_func_obstack = yes; then
  INCLUDE_OBSTACK_H='#include <obstack.h>'
else
  INCLUDE_OBSTACK_H='#include <gnu/obstack.h>'
  OBSTACK_H=obstack.h
fi
AC_SUBST([OBSTACK_H])
AC_SUBST([INCLUDE_OBSTACK_H])
])# M4_FUNC_OBSTACK