On 3/12/20 1:53 PM, Zack Weinberg wrote:
the changed behavior of autoconf trunk was not intentional; it's because commit 2b59b6f8a79b8bf77e178ff4e5aa0ede433d39cf missed a direct use of $as_echo in _AS_DETECT_BETTER_SHELL, causing _AS_DETECT_BETTER_SHELL *not to work at all*!
Thanks for catching that. I looked into the history of that part of Autoconf and it appears the string is being echoed only for historical reasons. So I installed the attached to bypass the need for using $as_echo or equivalent.
>From 81ffea246c44336859e61a68a0fcb0ee99d582c8 Mon Sep 17 00:00:00 2001 From: Paul Eggert <egg...@cs.ucla.edu> Date: Thu, 12 Mar 2020 17:00:44 -0700 Subject: [PATCH] Fix _AS_DETECT_BETTER_SHELL breakage Problem reported by Zack Weinberg in: https://lists.gnu.org/r/autoconf/2020-03/msg00017.html * lib/m4sugar/m4sh.m4 (_AS_RUN): Use sh -c instead of the no-longer-existent $as_echo. This fixes a bug introduced in 2013-01-28T03:44:45Z!g...@gnu.org. --- lib/m4sugar/m4sh.m4 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4 index f8be3186..92999f58 100644 --- a/lib/m4sugar/m4sh.m4 +++ b/lib/m4sugar/m4sh.m4 @@ -418,7 +418,7 @@ m4_default_quoted([$4], [M4SH-INIT-FN]))])]) # or under the given SHELL, protecting it from syntax errors. # Set as_run in order to assist _AS_LINENO_WORKS. m4_define([_AS_RUN], -[m4_ifval([$2], [{ $as_echo "$as_bourne_compatible"$1 | as_run=a $2; }], +[m4_ifval([$2], [as_run=a $2 -c "$as_bourne_compatible"$1], [(eval $1)]) 2>/dev/null]) -- 2.24.1
