From: Akim Demaille <akim@epita.fr>
Date: Thu, 21 Jun 2001 09:18:16 +0000 (+0000)
Subject: ./configure --program-suffix=foo produces `transform=s,$$,foo,;',
X-Git-Tag: AUTOCONF-2.50a~18
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=21c5ee474bc14af7573dff87f17ec8d43c9fcb65;p=thirdparty%2Fautoconf.git

./configure --program-suffix=foo produces `transform=s,$$,foo,;',
but some sed choke on multiple `;', and other tools (e.g.,
Automake), include the separator themselves.
* acgeneral.m4 (AC_ARG_VAR): Be sure not to leave extra `;'.
---

diff --git a/ChangeLog b/ChangeLog
index 4c631e4c9..60698bed2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2001-06-21  Akim Demaille  <akim@epita.fr>
+
+	./configure --program-suffix=foo produces `transform=s,$$,foo,;',
+	but some sed choke on multiple `;', and other tools (e.g.,
+	Automake), include the separator themselves.
+
+	* acgeneral.m4 (AC_ARG_VAR): Be sure not to leave extra `;'.
+
 2001-06-19  Tim Van Holder  <tim.van.holder@pandora.be>
 
 	* doc/autoconf.texi (Functions Portability): Rename as...
diff --git a/NEWS b/NEWS
index 1e6eb06ec..94e90e34f 100644
--- a/NEWS
+++ b/NEWS
@@ -24,6 +24,7 @@
   of the first one.
 - AC_ARG_VAR properly propagates precious variables inherited from the
   environment to ./config.status.
+- Using --program-suffix/--program-prefix is portable.
 
 ** Generic macros
 - AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
diff --git a/acgeneral.m4 b/acgeneral.m4
index 44e17c518..f26d79422 100644
--- a/acgeneral.m4
+++ b/acgeneral.m4
@@ -1570,9 +1570,9 @@ dnl it's sensitive.  Putting any kind of quote in it causes syntax errors.
     esac
   fi
 done
-if $ac_suggest_removing_cache; then
-  AC_MSG_WARN([changes in the environment can compromise the build])
-  AC_MSG_WARN([consider removing $cache_file and starting over])
+if $ac_cache_corrupted; then
+  AS_MESSAGE([error: changes in the environment can compromise the build])
+  AS_ERROR([run `make distclean' and/or `rm $config_cache' and start over])
 fi
 ])# _AC_ARG_VAR_VALIDATE
 
@@ -1615,24 +1615,18 @@ Program names:
   --program-suffix=SUFFIX            append SUFFIX to installed program names
   --program-transform-name=PROGRAM   run sed PROGRAM on installed program names
 m4_divert_pop([HELP_BEGIN])dnl
-if test "$program_transform_name" = s,x,x,; then
-  program_transform_name=
-else
-  # Double any \ or $.  echo might interpret backslashes.
-  cat <<\EOF >conftest.sed
-s,\\,\\\\,g; s,\$,$$,g
-EOF
-  program_transform_name=`echo $program_transform_name | sed -f conftest.sed`
-  rm -f conftest.sed
-fi
 test "$program_prefix" != NONE &&
-  program_transform_name="s,^,${program_prefix},;$program_transform_name"
+  program_transform_name="s,^,$program_prefix,;$program_transform_name"
 # Use a double $ so make ignores it.
 test "$program_suffix" != NONE &&
-  program_transform_name="s,\$\$,${program_suffix},;$program_transform_name"
-
-# sed with no file args requires a program.
-test -z "$program_transform_name" && program_transform_name="s,x,x,"
+  program_transform_name="s,\$,$program_suffix,;$program_transform_name"
+# Double any \ or $.  echo might interpret backslashes.
+# By default was `s,x,x', remove it if useless.
+cat <<\_ACEOF >conftest.sed
+[s/[\\$]/&&/g;s/;s,x,x,$//]
+_ACEOF
+program_transform_name=`echo $program_transform_name | sed -f conftest.sed`
+rm conftest.sed
 ])# AC_ARG_PROGRAM
 
 
diff --git a/configure b/configure
index f877296f5..b343d382a 100755
--- a/configure
+++ b/configure
@@ -1042,24 +1042,18 @@ fi
 rm -f conftest*
 echo "$as_me:1043: result: yes" >&5
 echo "${ECHO_T}yes" >&6
-if test "$program_transform_name" = s,x,x,; then
-  program_transform_name=
-else
-  # Double any \ or $.  echo might interpret backslashes.
-  cat <<\EOF >conftest.sed
-s,\\,\\\\,g; s,\$,$$,g
-EOF
-  program_transform_name=`echo $program_transform_name | sed -f conftest.sed`
-  rm -f conftest.sed
-fi
 test "$program_prefix" != NONE &&
-  program_transform_name="s,^,${program_prefix},;$program_transform_name"
+  program_transform_name="s,^,$program_prefix,;$program_transform_name"
 # Use a double $ so make ignores it.
 test "$program_suffix" != NONE &&
-  program_transform_name="s,\$\$,${program_suffix},;$program_transform_name"
-
-# sed with no file args requires a program.
-test -z "$program_transform_name" && program_transform_name="s,x,x,"
+  program_transform_name="s,\$,$program_suffix,;$program_transform_name"
+# Double any \ or $.  echo might interpret backslashes.
+# By default was `s,x,x', remove it if useless.
+cat <<\_ACEOF >conftest.sed
+s/[\\$]/&&/g;s/;s,x,x,$//
+_ACEOF
+program_transform_name=`echo $program_transform_name | sed -f conftest.sed`
+rm conftest.sed
 
 test x"${MISSING+set}" = xset ||
   MISSING="\${SHELL} `CDPATH=:; cd $ac_aux_dir && pwd`/missing"
@@ -1069,11 +1063,11 @@ if eval "$MISSING --run true"; then
 else
   am_missing_run=
   am_backtick='`'
-  { echo "$as_me:1072: WARNING: ${am_backtick}missing' script is too old or missing" >&5
+  { echo "$as_me:1066: WARNING: ${am_backtick}missing' script is too old or missing" >&5
 echo "$as_me: WARNING: ${am_backtick}missing' script is too old or missing" >&2;}
 fi
 
-echo "$as_me:1076: checking whether ${MAKE-make} sets \${MAKE}" >&5
+echo "$as_me:1070: checking whether ${MAKE-make} sets \${MAKE}" >&5
 echo $ECHO_N "checking whether ${MAKE-make} sets \${MAKE}... $ECHO_C" >&6
 set dummy ${MAKE-make}; ac_make=`echo "$2" | sed 'y,./+-,__p_,'`
 if eval "test \"\${ac_cv_prog_make_${ac_make}_set+set}\" = set"; then
@@ -1093,11 +1087,11 @@ fi
 rm -f conftest.make
 fi
 if eval "test \"`echo '$ac_cv_prog_make_'${ac_make}_set`\" = yes"; then
-  echo "$as_me:1096: result: yes" >&5
+  echo "$as_me:1090: result: yes" >&5
 echo "${ECHO_T}yes" >&6
   SET_MAKE=
 else
-  echo "$as_me:1100: result: no" >&5
+  echo "$as_me:1094: result: no" >&5
 echo "${ECHO_T}no" >&6
   SET_MAKE="MAKE=${MAKE-make}"
 fi
@@ -1107,7 +1101,7 @@ PACKAGE=autoconf
 VERSION=2.50a
 
 if test "`cd $srcdir && pwd`" != "`pwd`" && test -f $srcdir/config.status; then
-  { { echo "$as_me:1110: error: source directory already configured; run \"make distclean\" there first" >&5
+  { { echo "$as_me:1104: error: source directory already configured; run \"make distclean\" there first" >&5
 echo "$as_me: error: source directory already configured; run \"make distclean\" there first" >&2;}
    { (exit 1); exit 1; }; }
 fi
@@ -1137,7 +1131,7 @@ AUTOTEST_PATH=..
 
 # Extract the first word of "expr", so it can be a program name with args.
 set dummy expr; ac_word=$2
-echo "$as_me:1140: checking for $ac_word" >&5
+echo "$as_me:1134: checking for $ac_word" >&5
 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
 if test "${ac_cv_path_EXPR+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -1154,7 +1148,7 @@ for ac_dir in $ac_dummy; do
   test -z "$ac_dir" && ac_dir=.
   if $as_executable_p "$ac_dir/$ac_word"; then
    ac_cv_path_EXPR="$ac_dir/$ac_word"
-   echo "$as_me:1157: found $ac_dir/$ac_word" >&5
+   echo "$as_me:1151: found $ac_dir/$ac_word" >&5
    break
 fi
 done
@@ -1165,10 +1159,10 @@ fi
 EXPR=$ac_cv_path_EXPR
 
 if test -n "$EXPR"; then
-  echo "$as_me:1168: result: $EXPR" >&5
+  echo "$as_me:1162: result: $EXPR" >&5
 echo "${ECHO_T}$EXPR" >&6
 else
-  echo "$as_me:1171: result: no" >&5
+  echo "$as_me:1165: result: no" >&5
 echo "${ECHO_T}no" >&6
 fi
 
@@ -1180,7 +1174,7 @@ for ac_prog in gm4 gnum4 m4
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
-echo "$as_me:1183: checking for $ac_word" >&5
+echo "$as_me:1177: checking for $ac_word" >&5
 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
 if test "${ac_cv_path_M4+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -1197,7 +1191,7 @@ for ac_dir in $ac_dummy; do
   test -z "$ac_dir" && ac_dir=.
   if $as_executable_p "$ac_dir/$ac_word"; then
    ac_cv_path_M4="$ac_dir/$ac_word"
-   echo "$as_me:1200: found $ac_dir/$ac_word" >&5
+   echo "$as_me:1194: found $ac_dir/$ac_word" >&5
    break
 fi
 done
@@ -1208,10 +1202,10 @@ fi
 M4=$ac_cv_path_M4
 
 if test -n "$M4"; then
-  echo "$as_me:1211: result: $M4" >&5
+  echo "$as_me:1205: result: $M4" >&5
 echo "${ECHO_T}$M4" >&6
 else
-  echo "$as_me:1214: result: no" >&5
+  echo "$as_me:1208: result: no" >&5
 echo "${ECHO_T}no" >&6
 fi
 
@@ -1219,7 +1213,7 @@ fi
 done
 test -n "$M4" || M4="m4"
 
-echo "$as_me:1222: checking whether m4 supports frozen files" >&5
+echo "$as_me:1216: checking whether m4 supports frozen files" >&5
 echo $ECHO_N "checking whether m4 supports frozen files... $ECHO_C" >&6
 if test "${ac_cv_prog_gnu_m4+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -1231,10 +1225,10 @@ if test x"$M4" != x; then
   esac
 fi
 fi
-echo "$as_me:1234: result: $ac_cv_prog_gnu_m4" >&5
+echo "$as_me:1228: result: $ac_cv_prog_gnu_m4" >&5
 echo "${ECHO_T}$ac_cv_prog_gnu_m4" >&6
 if test x"$ac_cv_prog_gnu_m4" != xyes; then
-  { { echo "$as_me:1237: error: GNU m4 1.4 is required" >&5
+  { { echo "$as_me:1231: error: GNU m4 1.4 is required" >&5
 echo "$as_me: error: GNU m4 1.4 is required" >&2;}
    { (exit 1); exit 1; }; }
 fi
@@ -1246,7 +1240,7 @@ for ac_prog in mawk gawk nawk awk
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
-echo "$as_me:1249: checking for $ac_word" >&5
+echo "$as_me:1243: checking for $ac_word" >&5
 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
 if test "${ac_cv_prog_AWK+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -1261,7 +1255,7 @@ for ac_dir in $ac_dummy; do
   test -z "$ac_dir" && ac_dir=.
   $as_executable_p "$ac_dir/$ac_word" || continue
 ac_cv_prog_AWK="$ac_prog"
-echo "$as_me:1264: found $ac_dir/$ac_word" >&5
+echo "$as_me:1258: found $ac_dir/$ac_word" >&5
 break
 done
 
@@ -1269,10 +1263,10 @@ fi
 fi
 AWK=$ac_cv_prog_AWK
 if test -n "$AWK"; then
-  echo "$as_me:1272: result: $AWK" >&5
+  echo "$as_me:1266: result: $AWK" >&5
 echo "${ECHO_T}$AWK" >&6
 else
-  echo "$as_me:1275: result: no" >&5
+  echo "$as_me:1269: result: no" >&5
 echo "${ECHO_T}no" >&6
 fi
 
@@ -1286,7 +1280,7 @@ HELP2MAN=${HELP2MAN-"${am_missing_run}help2man"}
 # We use a path for perl so the #! line in autoscan will work.
 # Extract the first word of "perl", so it can be a program name with args.
 set dummy perl; ac_word=$2
-echo "$as_me:1289: checking for $ac_word" >&5
+echo "$as_me:1283: checking for $ac_word" >&5
 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
 if test "${ac_cv_path_PERL+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -1303,7 +1297,7 @@ for ac_dir in $ac_dummy; do
   test -z "$ac_dir" && ac_dir=.
   if $as_executable_p "$ac_dir/$ac_word"; then
    ac_cv_path_PERL="$ac_dir/$ac_word"
-   echo "$as_me:1306: found $ac_dir/$ac_word" >&5
+   echo "$as_me:1300: found $ac_dir/$ac_word" >&5
    break
 fi
 done
@@ -1315,17 +1309,17 @@ fi
 PERL=$ac_cv_path_PERL
 
 if test -n "$PERL"; then
-  echo "$as_me:1318: result: $PERL" >&5
+  echo "$as_me:1312: result: $PERL" >&5
 echo "${ECHO_T}$PERL" >&6
 else
-  echo "$as_me:1321: result: no" >&5
+  echo "$as_me:1315: result: no" >&5
 echo "${ECHO_T}no" >&6
 fi
 
 if test "$PERL" != no; then
   PERLSCRIPTS="autoscan autoupdate"
 else
-  { echo "$as_me:1328: WARNING: autoscan and autoupdate will not be built since perl is not found" >&5
+  { echo "$as_me:1322: WARNING: autoscan and autoupdate will not be built since perl is not found" >&5
 echo "$as_me: WARNING: autoscan and autoupdate will not be built since perl is not found" >&2;}
 fi
 
@@ -1341,7 +1335,7 @@ fi
 # AFS /usr/afsws/bin/install, which mishandles nonexistent args
 # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
 # ./install, which can be erroneously created by make from ./install.sh.
-echo "$as_me:1344: checking for a BSD compatible install" >&5
+echo "$as_me:1338: checking for a BSD compatible install" >&5
 echo $ECHO_N "checking for a BSD compatible install... $ECHO_C" >&6
 if test -z "$INSTALL"; then
 if test "${ac_cv_path_install+set}" = set; then
@@ -1390,7 +1384,7 @@ fi
     INSTALL=$ac_install_sh
   fi
 fi
-echo "$as_me:1393: result: $INSTALL" >&5
+echo "$as_me:1387: result: $INSTALL" >&5
 echo "${ECHO_T}$INSTALL" >&6
 
 # Use test -z because SunOS4 sh mishandles braces in ${var-val}.
@@ -1514,7 +1508,7 @@ rm -f confdef2opt.sed
 : ${CONFIG_STATUS=./config.status}
 ac_clean_files_save=$ac_clean_files
 ac_clean_files="$ac_clean_files $CONFIG_STATUS"
-{ echo "$as_me:1517: creating $CONFIG_STATUS" >&5
+{ echo "$as_me:1511: creating $CONFIG_STATUS" >&5
 echo "$as_me: creating $CONFIG_STATUS" >&6;}
 cat >$CONFIG_STATUS <<_ACEOF
 #! $SHELL
@@ -1682,7 +1676,7 @@ cat >>$CONFIG_STATUS <<\EOF
     echo "$ac_cs_version"; exit 0 ;;
   --he | --h)
     # Conflict between --help and --header
-    { { echo "$as_me:1685: error: ambiguous option: $1
+    { { echo "$as_me:1679: error: ambiguous option: $1
 Try \`$0 --help' for more information." >&5
 echo "$as_me: error: ambiguous option: $1
 Try \`$0 --help' for more information." >&2;}
@@ -1710,12 +1704,12 @@ Try \`$0 --help' for more information." >&2;}
   'tests/atconfig' ) CONFIG_FILES="$CONFIG_FILES tests/atconfig" ;;
 
   # This is an error.
-  -*) { { echo "$as_me:1713: error: unrecognized option: $1
+  -*) { { echo "$as_me:1707: error: unrecognized option: $1
 Try \`$0 --help' for more information." >&5
 echo "$as_me: error: unrecognized option: $1
 Try \`$0 --help' for more information." >&2;}
    { (exit 1); exit 1; }; } ;;
-  *) { { echo "$as_me:1718: error: invalid argument: $1" >&5
+  *) { { echo "$as_me:1712: error: invalid argument: $1" >&5
 echo "$as_me: error: invalid argument: $1" >&2;}
    { (exit 1); exit 1; }; };;
   esac
@@ -1943,7 +1937,7 @@ done; }
   esac
 
   if test x"$ac_file" != x-; then
-    { echo "$as_me:1946: creating $ac_file" >&5
+    { echo "$as_me:1940: creating $ac_file" >&5
 echo "$as_me: creating $ac_file" >&6;}
     rm -f "$ac_file"
   fi
@@ -1961,7 +1955,7 @@ echo "$as_me: creating $ac_file" >&6;}
       -) echo $tmp/stdin ;;
       [\\/$]*)
          # Absolute (can't be DOS-style, as IFS=:)
-         test -f "$f" || { { echo "$as_me:1964: error: cannot find input file: $f" >&5
+         test -f "$f" || { { echo "$as_me:1958: error: cannot find input file: $f" >&5
 echo "$as_me: error: cannot find input file: $f" >&2;}
    { (exit 1); exit 1; }; }
          echo $f;;
@@ -1974,7 +1968,7 @@ echo "$as_me: error: cannot find input file: $f" >&2;}
            echo $srcdir/$f
          else
            # /dev/null tree
-           { { echo "$as_me:1977: error: cannot find input file: $f" >&5
+           { { echo "$as_me:1971: error: cannot find input file: $f" >&5
 echo "$as_me: error: cannot find input file: $f" >&2;}
    { (exit 1); exit 1; }; }
          fi;;
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index ae8f66653..63358a42a 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -8431,6 +8431,14 @@ of a character class.  In conformance with @sc{posix}, the Cray
 Sed scripts should not use branch labels longer than 8 characters and
 should not contain comments.
 
+Don't include extra @samp{;}, as some @command{sed}, such as NetBSD
+1.4.2's, try to interpret the second as a command:
+
+@example
+$ echo a | sed 's/x/x/;;s/x/x/'
+sed: 1: "s/x/x/;;s/x/x/": invalid command code ;
+@end example
+
 Input should have reasonably long lines, since some @command{sed} have
 an input buffer limited to 4000 bytes.
 
@@ -9078,10 +9086,12 @@ the same name.  For example, if you configure @sc{gnu} @code{diff} with
 installed as @file{/usr/local/bin/gdiff}.
 
 As a more sophisticated example, you could use
+
 @example
 --program-transform-name='s/^/g/; s/^gg/g/; s/^gless/less/'
 @end example
 @noindent
+
 to prepend @samp{g} to most of the program names in a source tree,
 excepting those like @code{gdb} that already have one and those like
 @code{less} and @code{lesskey} that aren't @sc{gnu} programs.  (That is
@@ -9130,6 +9140,15 @@ uninstall:
         done
 @end example
 
+It is guaranteed that @code{program_transform_name} is never empty, and
+that there are no useless separators.  Therefore you may safely embed
+@code{program_transform_name} within a sed program using @samp{;}:
+
+@example
+transform = @@program_transform_name@@
+transform_exe = s/$(EXEEXT)$$//;$(transform);s/$$/$(EXEEXT)/
+@end example
+
 Whether to do the transformations on documentation files (Texinfo or
 @code{man}) is a tricky question; there seems to be no perfect answer,
 due to the several reasons for name transforming.  Documentation is not
diff --git a/lib/autoconf/general.m4 b/lib/autoconf/general.m4
index 44e17c518..f26d79422 100644
--- a/lib/autoconf/general.m4
+++ b/lib/autoconf/general.m4
@@ -1570,9 +1570,9 @@ dnl it's sensitive.  Putting any kind of quote in it causes syntax errors.
     esac
   fi
 done
-if $ac_suggest_removing_cache; then
-  AC_MSG_WARN([changes in the environment can compromise the build])
-  AC_MSG_WARN([consider removing $cache_file and starting over])
+if $ac_cache_corrupted; then
+  AS_MESSAGE([error: changes in the environment can compromise the build])
+  AS_ERROR([run `make distclean' and/or `rm $config_cache' and start over])
 fi
 ])# _AC_ARG_VAR_VALIDATE
 
@@ -1615,24 +1615,18 @@ Program names:
   --program-suffix=SUFFIX            append SUFFIX to installed program names
   --program-transform-name=PROGRAM   run sed PROGRAM on installed program names
 m4_divert_pop([HELP_BEGIN])dnl
-if test "$program_transform_name" = s,x,x,; then
-  program_transform_name=
-else
-  # Double any \ or $.  echo might interpret backslashes.
-  cat <<\EOF >conftest.sed
-s,\\,\\\\,g; s,\$,$$,g
-EOF
-  program_transform_name=`echo $program_transform_name | sed -f conftest.sed`
-  rm -f conftest.sed
-fi
 test "$program_prefix" != NONE &&
-  program_transform_name="s,^,${program_prefix},;$program_transform_name"
+  program_transform_name="s,^,$program_prefix,;$program_transform_name"
 # Use a double $ so make ignores it.
 test "$program_suffix" != NONE &&
-  program_transform_name="s,\$\$,${program_suffix},;$program_transform_name"
-
-# sed with no file args requires a program.
-test -z "$program_transform_name" && program_transform_name="s,x,x,"
+  program_transform_name="s,\$,$program_suffix,;$program_transform_name"
+# Double any \ or $.  echo might interpret backslashes.
+# By default was `s,x,x', remove it if useless.
+cat <<\_ACEOF >conftest.sed
+[s/[\\$]/&&/g;s/;s,x,x,$//]
+_ACEOF
+program_transform_name=`echo $program_transform_name | sed -f conftest.sed`
+rm conftest.sed
 ])# AC_ARG_PROGRAM
 
 
diff --git a/lib/m4sugar/m4sh.m4 b/lib/m4sugar/m4sh.m4
index d3210e83f..a0036e17d 100644
--- a/lib/m4sugar/m4sh.m4
+++ b/lib/m4sugar/m4sh.m4
@@ -220,8 +220,8 @@ m4_define([_AS_QUOTE],
 $1])])
 
 
-# _AS_ECHO(STRING, [FD = AS_FD_MSG])
-# ----------------------------------
+# _AS_ECHO(STRING, [FD = AS_MESSAGE_FD])
+# --------------------------------------
 # Protect STRING from backquote expansion, echo the result to FD.
 m4_define([_AS_ECHO],
 [_AS_ECHO_UNQUOTED([_AS_QUOTE([$1])], [$2])])
diff --git a/m4sh.m4 b/m4sh.m4
index d3210e83f..a0036e17d 100644
--- a/m4sh.m4
+++ b/m4sh.m4
@@ -220,8 +220,8 @@ m4_define([_AS_QUOTE],
 $1])])
 
 
-# _AS_ECHO(STRING, [FD = AS_FD_MSG])
-# ----------------------------------
+# _AS_ECHO(STRING, [FD = AS_MESSAGE_FD])
+# --------------------------------------
 # Protect STRING from backquote expansion, echo the result to FD.
 m4_define([_AS_ECHO],
 [_AS_ECHO_UNQUOTED([_AS_QUOTE([$1])], [$2])])