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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_require_one_func.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_REQUIRE_ONE_FUNC (FUNCTION..., [ACTION-IF-ANY-FOUND], [ACTION-IF-NONE-FOUND])
#
# DESCRIPTION
#
# AX_REQUIRE_ONE_FUNC is a simple wrapper for AC_CHECK_FUNCS. It calls
# AC_CHECK_FUNCS on the list of functions named in the first argument,
# then invokes ACTION-IF-ANY-FOUND if at least one of the functions exists
# or ACTION-IF-NONE-FOUND if none of the functions exist.
#
# Here's an example:
#
# AX_REQUIRE_ONE_FUNC([posix_memalign memalign valloc], ,
# [AC_MSG_ERROR([unable to allocate page-aligned memory])])
#
# LICENSE
#
# Copyright (c) 2008 Scott Pakin <pakin@uiuc.edu>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 9
AC_DEFUN([AX_REQUIRE_ONE_FUNC],
[m4_define([ax_1func_cv], [AS_TR_SH(ax_cv_func_any_$1)])
AC_CACHE_VAL([ax_1func_cv],
[ax_1func_cv=no
AC_CHECK_FUNCS([$1], [ax_1func_cv="$ax_1func_cv $ac_func"])])
AS_IF([test "$ax_1func_cv" = "no"],
[$3],
[ax_1func_cv=`echo $ax_1func_cv | sed 's/^no //'`
$2])
])
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