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Diffstat (limited to 'm4/ax_recursive_eval.m4')
| -rw-r--r-- | m4/ax_recursive_eval.m4 | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/m4/ax_recursive_eval.m4 b/m4/ax_recursive_eval.m4 new file mode 100644 index 0000000..0283602 --- /dev/null +++ b/m4/ax_recursive_eval.m4 @@ -0,0 +1,31 @@ +# SPDX-License-Identifier: GPL-2.0-or-later WITH Autoconf-exception-2.0 +# +# =========================================================================== +# 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. This version has a recursion limit (10). +# +# LICENSE +# +# Copyright (c) 2008 Alexandre Duret-Lutz <adl@gnu.org> +# Copyright (c) 2024 David Lamparter <equinox@opensourcerouting.org> + +AC_DEFUN([AX_RECURSIVE_EVAL], +[_lcl_receval="$1" +$2=`(test "x$prefix" = xNONE && prefix="$ac_default_prefix" + test "x$exec_prefix" = xNONE && exec_prefix="${prefix}" + _lcl_receval_old='' + for _rec_limit in 1 2 3 4 5 6 7 8 9 10; do + test "[$]_lcl_receval_old" = "[$]_lcl_receval" && break + _lcl_receval_old="[$]_lcl_receval" + eval _lcl_receval="\"[$]_lcl_receval\"" + done + echo "[$]_lcl_receval")`]) |