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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_func_getopt_long.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_FUNC_GETOPT_LONG
#
# DESCRIPTION
#
# Check for getopt_long support.
#
# This assume that the standard getopt.h file (from GNU libc) is available
# as lib/gnugetopt.h. If needed, this file will be linked as getopt.h, but
# we want to default to the system's getopt.h file. (See
# http://sources.redhat.com/ml/automake/2000-09/msg00041.html for an
# explanation about why using the system's getopt.h file is important.)
#
# LICENSE
#
# Copyright (c) 2008 Alexandre Duret-Lutz <adl@gnu.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/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 6
AU_ALIAS([ADL_FUNC_GETOPT_LONG], [AX_FUNC_GETOPT_LONG])
AC_DEFUN([AX_FUNC_GETOPT_LONG],
[AC_PREREQ(2.49)dnl
# clean out junk possibly left behind by a previous configuration
rm -f lib/getopt.h
# Check for getopt_long support
AC_CHECK_HEADERS([getopt.h])
AC_CHECK_FUNCS([getopt_long],,
[# FreeBSD has a gnugetopt library for this
AC_CHECK_LIB([gnugetopt],[getopt_long],[AC_DEFINE([HAVE_GETOPT_LONG])],
[# use the GNU replacement
AC_LIBOBJ(getopt)
AC_LIBOBJ(getopt1)
AC_CONFIG_LINKS([lib/getopt.h:lib/gnugetopt.h])])])])
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