1# =========================================================================== 2# https://www.gnu.org/software/autoconf-archive/ax_recursive_eval.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_RECURSIVE_EVAL(VALUE, RESULT) 8# 9# DESCRIPTION 10# 11# Interpolate the VALUE in loop until it doesn't change, and set the 12# result to $RESULT. WARNING: It's easy to get an infinite loop with some 13# unsane input. 14# 15# LICENSE 16# 17# Copyright (c) 2008 Alexandre Duret-Lutz <adl@gnu.org> 18# 19# This program is free software; you can redistribute it and/or modify it 20# under the terms of the GNU General Public License as published by the 21# Free Software Foundation; either version 2 of the License, or (at your 22# option) any later version. 23# 24# This program is distributed in the hope that it will be useful, but 25# WITHOUT ANY WARRANTY; without even the implied warranty of 26# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 27# Public License for more details. 28# 29# You should have received a copy of the GNU General Public License along 30# with this program. If not, see <https://www.gnu.org/licenses/>. 31# 32# As a special exception, the respective Autoconf Macro's copyright owner 33# gives unlimited permission to copy, distribute and modify the configure 34# scripts that are the output of Autoconf when processing the Macro. You 35# need not follow the terms of the GNU General Public License when using 36# or distributing such scripts, even though portions of the text of the 37# Macro appear in them. The GNU General Public License (GPL) does govern 38# all other use of the material that constitutes the Autoconf Macro. 39# 40# This special exception to the GPL applies to versions of the Autoconf 41# Macro released by the Autoconf Archive. When you make and distribute a 42# modified version of the Autoconf Macro, you may extend this special 43# exception to the GPL to apply to your modified version as well. 44 45#serial 1 46 47AC_DEFUN([AX_RECURSIVE_EVAL], 48[_lcl_receval="$1" 49$2=`(test "x$prefix" = xNONE && prefix="$ac_default_prefix" 50 test "x$exec_prefix" = xNONE && exec_prefix="${prefix}" 51 _lcl_receval_old='' 52 while test "[$]_lcl_receval_old" != "[$]_lcl_receval"; do 53 _lcl_receval_old="[$]_lcl_receval" 54 eval _lcl_receval="\"[$]_lcl_receval\"" 55 done 56 echo "[$]_lcl_receval")`]) 57