From: Paul Eggert <eggert@cs.ucla.edu>
Date: Fri, 13 Mar 2020 00:00:44 +0000 (-0700)
Subject: Fix _AS_DETECT_BETTER_SHELL breakage
X-Git-Tag: v2.69b~28
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9894c7b5ba694820636f79ddec0c82e23af5e8e0;p=thirdparty%2Fautoconf.git

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!gary@gnu.org.
---

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])