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Diffstat (limited to 'm4/ax_recursive_eval.m4')
| -rw-r--r-- | m4/ax_recursive_eval.m4 | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/m4/ax_recursive_eval.m4 b/m4/ax_recursive_eval.m4 new file mode 100644 index 000000000..0625aca22 --- /dev/null +++ b/m4/ax_recursive_eval.m4 @@ -0,0 +1,56 @@ +# =========================================================================== +# https://www.gnu.org/software/autoconf-archive/ax_recursive_eval.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_RECURSIVE_EVAL(VALUE, RESULT) +# +# DESCRIPTION +# +# Interpolate the VALUE in loop until it doesn't change, and set the +# result to $RESULT. WARNING: It's easy to get an infinite loop with some +# unsane input. +# +# 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 1 + +AC_DEFUN([AX_RECURSIVE_EVAL], +[_lcl_receval="$1" +$2=`(test "x$prefix" = xNONE && prefix="$ac_default_prefix" + test "x$exec_prefix" = xNONE && exec_prefix="${prefix}" + _lcl_receval_old='' + while test "[$]_lcl_receval_old" != "[$]_lcl_receval"; do + _lcl_receval_old="[$]_lcl_receval" + eval _lcl_receval="\"[$]_lcl_receval\"" + done + echo "[$]_lcl_receval")`]) |