From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sun, 2 Apr 2023 03:25:13 +0000 (-0700)
Subject: Support underquoted callers better
X-Git-Tag: v2.72d~30
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=794182506c3c5814d48b2fc4d832770f608ce0ef;p=thirdparty%2Fautoconf.git

Support underquoted callers better

Problem reported bh Khem Raj for mcpp 2.7.2 (2008) in:
https://lists.gnu.org/r/autoconf/2023-04/msg00001.html
* lib/autoconf/programs.m4 (_AC_PATH_PROG_FLAVOR_GNU):
Add two ‘@%:@(’s to cater to underquoted callers.
* lib/m4sugar/m4sh.m4 (_AS_PATH_WALK): Use quadrigraph instead of
‘#’, for underquoted callers.
---

diff --git a/lib/autoconf/programs.m4 b/lib/autoconf/programs.m4
index 62ba6b8b6..d06d18c44 100644
--- a/lib/autoconf/programs.m4
+++ b/lib/autoconf/programs.m4
@@ -543,11 +543,12 @@ dnl   # for best performing tool in a list breaks down.
 # ----------------------------------------------------------------
 m4_define([_AC_PATH_PROG_FLAVOR_GNU],
 [# Check for GNU $1
-case `"$1" --version 2>&1` in
+case `"$1" --version 2>&1` in @%:@(
 *GNU*)
   $2;;
 m4_ifval([$3],
-[*)
+[@%:@(
+*)
   $3;;
 ])esac
 ])# _AC_PATH_PROG_FLAVOR_GNU
diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4
index ab5ca7db7..368487fa0 100644
--- a/lib/m4sugar/m4sh.m4
+++ b/lib/m4sugar/m4sh.m4
@@ -1389,7 +1389,7 @@ m4_if([$1], m4_translit([[$1]], [:;]),
 for as_dir in $as_dummy])
 do
   IFS=$as_save_IFS
-  case $as_dir in #(((
+  case $as_dir in @%:@(((
     '') as_dir=./ ;;
     */) ;;
     *) as_dir=$as_dir/ ;;