# ax_lib_elfutils.m4 -- Check elfutils version
#
# Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions: The above copyright notice and
# this permission notice shall be included in all copies or substantial
# portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# Check the currently installed version of elfutils by using the
# _ELFUTILS_PREREQ macro defined in elfutils/version.h.
#
# AX_LIB_ELFUTILS(MAJOR_VERSION, MINOR_VERSION, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
# ---------------------------------------------------------------------------
AC_DEFUN([AX_LIB_ELFUTILS], [
	m4_pushdef([major_version], [$1])
	m4_pushdef([minor_version], [$2])

	AC_MSG_CHECKING([for elfutils version >= major_version.minor_version])
	m4_if([$#], 3, [
		m4_pushdef([true_action], [$3])
	], [
		m4_pushdef([true_action], [])
	])

	m4_if([$#], 4, [
		m4_pushdef([false_action], [$4])
	], [
		m4_pushdef([false_action], [
			AC_MSG_ERROR(elfutils >= major_version.minor_version is required)])
	])

	AC_RUN_IFELSE([
		AC_LANG_SOURCE([
			#include <stdlib.h>
			#include <elfutils/version.h>

			int main(void) {
				return _ELFUTILS_PREREQ(major_version, minor_version) ? EXIT_SUCCESS : EXIT_FAILURE;
			}
		])
	],
		echo yes
		true_action,
		echo no
		false_action)

	m4_popdef([false_action])
	m4_popdef([true_action])
	m4_popdef([minor_version])
	m4_popdef([major_version])
])