(_AC_INIT_PREPARE_ENVIRONMENT) [setting IFS]: Be careful

to use space, tab and new line, in precisely that order.

diff --git a/acgeneral.m4 b/acgeneral.m4
index 7c98f29a303c7998d3f811185b511d597fd3f015..3c80e7a3c46a07cf0c942dd46d9ec894a67d4d09 100644 (file)
--- a/acgeneral.m4
+++ b/acgeneral.m4
@@ -1221,9 +1221,10 @@ if test "${LC_MESSAGES+set}" = set; then LC_MESSAGES=C; export LC_MESSAGES; fi
 if test "${LC_CTYPE+set}"    = set; then LC_CTYPE=C;    export LC_CTYPE;    fi
 
 # IFS
-# We need space, tab and new line.
-IFS="
-       "dnl
+# We need space, tab and new line, in precisely that order.
+ac_nl='
+'
+IFS="  $ac_nl"dnl
 ])
 
 # _AC_INIT_PREPARE([UNIQUE-FILE-IN-SOURCE-DIR])

diff --git a/lib/autoconf/general.m4 b/lib/autoconf/general.m4
index 7c98f29a303c7998d3f811185b511d597fd3f015..3c80e7a3c46a07cf0c942dd46d9ec894a67d4d09 100644 (file)
--- a/lib/autoconf/general.m4
+++ b/lib/autoconf/general.m4
@@ -1221,9 +1221,10 @@ if test "${LC_MESSAGES+set}" = set; then LC_MESSAGES=C; export LC_MESSAGES; fi
 if test "${LC_CTYPE+set}"    = set; then LC_CTYPE=C;    export LC_CTYPE;    fi
 
 # IFS
-# We need space, tab and new line.
-IFS="
-       "dnl
+# We need space, tab and new line, in precisely that order.
+ac_nl='
+'
+IFS="  $ac_nl"dnl
 ])
 
 # _AC_INIT_PREPARE([UNIQUE-FILE-IN-SOURCE-DIR])