m4/ax_enable_builddir.m4 - third_party/libffi - Git at Google

 # ===========================================================================
 #    https://www.gnu.org/software/autoconf-archive/ax_enable_builddir.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
 #   AX_ENABLE_BUILDDIR [(dirstring-or-command [,Makefile.mk [,-all]])]
 #
 # DESCRIPTION
 #
 #   If the current configure was run within the srcdir then we move all
 #   configure-files into a subdir and let the configure steps continue
 #   there. We provide an option --disable-builddir to suppress the move into
 #   a separate builddir.
 #
 #   Defaults:
 #
 #     $1 = $host (overridden with $HOST)
 #     $2 = Makefile.mk
 #     $3 = -all
 #
 #   This macro must be called before AM_INIT_AUTOMAKE. It creates a default
 #   toplevel srcdir Makefile from the information found in the created
 #   toplevel builddir Makefile. It just copies the variables and
 #   rule-targets, each extended with a default rule-execution that recurses
 #   into the build directory of the current "HOST". You can override the
 #   auto-detection through `config.guess` and build-time of course, as in
 #
 #     make HOST=i386-mingw-cross
 #
 #   which can of course set at configure time as well using
 #
 #     configure --host=i386-mingw-cross
 #
 #   After the default has been created, additional rules can be appended
 #   that will not just recurse into the subdirectories and only ever exist
 #   in the srcdir toplevel makefile - these parts are read from the $2 =
 #   Makefile.mk file
 #
 #   The automatic rules are usually scanning the toplevel Makefile for lines
 #   like '#### $host |$builddir' to recognize the place where to recurse
 #   into. Usually, the last one is the only one used. However, almost all
 #   targets have an additional "*-all" rule which makes the script to
 #   recurse into _all_ variants of the current HOST (!!) setting. The "-all"
 #   suffix can be overridden for the macro as well.
 #
 #   a special rule is only given for things like "dist" that will copy the
 #   tarball from the builddir to the sourcedir (or $(PUB)) for reason of
 #   convenience.
 #
 # LICENSE
 #
 #   Copyright (c) 2009 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2009 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
 #
 #   This program is free software; you can redistribute it and/or modify it
 #   under the terms of the GNU General Public License as published by the
 #   Free Software Foundation; either version 3 of the License, or (at your
 #   option) any later version.
 #
 #   This program is distributed in the hope that it will be useful, but
 #   WITHOUT ANY WARRANTY; without even the implied warranty of
 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 #   Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
 #   with this program. If not, see <https://www.gnu.org/licenses/>.
 #
 #   As a special exception, the respective Autoconf Macro's copyright owner
 #   gives unlimited permission to copy, distribute and modify the configure
 #   scripts that are the output of Autoconf when processing the Macro. You
 #   need not follow the terms of the GNU General Public License when using
 #   or distributing such scripts, even though portions of the text of the
 #   Macro appear in them. The GNU General Public License (GPL) does govern
 #   all other use of the material that constitutes the Autoconf Macro.
 #
 #   This special exception to the GPL applies to versions of the Autoconf
 #   Macro released by the Autoconf Archive. When you make and distribute a
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.

 #serial 30

 AC_DEFUN([AX_ENABLE_BUILDDIR],[
 AC_REQUIRE([AC_CANONICAL_HOST])[]dnl
 AC_REQUIRE([AC_CANONICAL_TARGET])[]dnl
 AC_REQUIRE([AX_CONFIGURE_ARGS])[]dnl
 AC_REQUIRE([AM_AUX_DIR_EXPAND])[]dnl
 AC_BEFORE([$0],[AM_INIT_AUTOMAKE])dnl
 AS_VAR_PUSHDEF([SUB],[ax_enable_builddir])dnl
 AS_VAR_PUSHDEF([AUX],[ax_enable_builddir_auxdir])dnl
 AS_VAR_PUSHDEF([SED],[ax_enable_builddir_sed])dnl
 SUB="."
 AC_ARG_ENABLE([builddir], AS_HELP_STRING(
   [--disable-builddir],[disable automatic build in subdir of sources])
   ,[SUB="$enableval"], [SUB="auto"])
 if test ".$ac_srcdir_defaulted" != ".no" ; then
 if test ".$srcdir" = ".." ; then
   if test -f config.status ; then
     AC_MSG_NOTICE(toplevel srcdir already configured... skipping subdir build)
   else
     test ".$SUB" = "."  && SUB="."
     test ".$SUB" = ".no"  && SUB="."
     test ".$TARGET" = "." && TARGET="$target"
     test ".$SUB" = ".auto" && SUB="m4_ifval([$1], [$1],[$TARGET])"
     if test ".$SUB" != ".." ; then    # we know where to go and
       AS_MKDIR_P([$SUB])
       echo __.$SUB.__ > $SUB/conftest.tmp
       cd $SUB
       if grep __.$SUB.__ conftest.tmp >/dev/null 2>/dev/null ; then
         rm conftest.tmp
         AC_MSG_RESULT([continue configure in default builddir "./$SUB"])
       else
         AC_MSG_ERROR([could not change to default builddir "./$SUB"])
       fi
       srcdir=`echo "$SUB" |
               sed -e 's,^\./,,;s,[[^/]]$,&/,;s,[[^/]]*/,../,g;s,[[/]]$,,;'`
       # going to restart from subdirectory location
       test -f $srcdir/config.log   && mv $srcdir/config.log   .
       test -f $srcdir/confdefs.h   && mv $srcdir/confdefs.h   .
       test -f $srcdir/conftest.log && mv $srcdir/conftest.log .
       test -f $srcdir/$cache_file  && mv $srcdir/$cache_file  .
       AC_MSG_RESULT(....exec $SHELL $srcdir/[$]0 "--srcdir=$srcdir" "--enable-builddir=$SUB" ${1+"[$]@"})
       case "[$]0" in # restart
        [[\\/]]* | ?:[[\\/]]*) # Absolute name
          eval $SHELL "'[$]0'" "'--srcdir=$srcdir'" "'--enable-builddir=$SUB'" $ac_configure_args ;;
        *) eval $SHELL "'$srcdir/[$]0'" "'--srcdir=$srcdir'" "'--enable-builddir=$SUB'" $ac_configure_args ;;
       esac ; exit $?
     fi
   fi
 fi fi
 test ".$SUB" = ".auto" && SUB="."
 dnl ac_path_prog uses "set dummy" to override $@ which would defeat the "exec"
 AC_PATH_PROG(SED,gsed sed, sed)
 AUX="$am_aux_dir"
 AS_VAR_POPDEF([SED])dnl
 AS_VAR_POPDEF([AUX])dnl
 AS_VAR_POPDEF([SUB])dnl
 AC_CONFIG_COMMANDS([buildir],[dnl .............. config.status ..............
 AS_VAR_PUSHDEF([SUB],[ax_enable_builddir])dnl
 AS_VAR_PUSHDEF([TOP],[top_srcdir])dnl
 AS_VAR_PUSHDEF([SRC],[ac_top_srcdir])dnl
 AS_VAR_PUSHDEF([AUX],[ax_enable_builddir_auxdir])dnl
 AS_VAR_PUSHDEF([SED],[ax_enable_builddir_sed])dnl
 pushdef([END],[Makefile.mk])dnl
 pushdef([_ALL],[ifelse([$3],,[-all],[$3])])dnl
   SRC="$ax_enable_builddir_srcdir"
   if test ".$SUB" = ".." ; then
     if test -f "$TOP/Makefile" ; then
       AC_MSG_NOTICE([skipping TOP/Makefile - left untouched])
     else
       AC_MSG_NOTICE([skipping TOP/Makefile - not created])
     fi
   else
     if test -f "$SRC/Makefile" ; then
       a=`grep "^VERSION " "$SRC/Makefile"` ; b=`grep "^VERSION " Makefile`
       test "$a" != "$b" && rm "$SRC/Makefile"
     fi
     if test -f "$SRC/Makefile" ; then
 	echo "$SRC/Makefile : $SRC/Makefile.in" > $tmp/conftemp.mk
 	echo "	[]@ echo 'REMOVED,,,' >\$[]@" >> $tmp/conftemp.mk
       eval "${MAKE-make} -f $tmp/conftemp.mk 2>/dev/null >/dev/null"
       if grep '^REMOVED,,,' "$SRC/Makefile" >/dev/null
       then rm $SRC/Makefile ; fi
       cp $tmp/conftemp.mk $SRC/makefiles.mk~      ## DEBUGGING
     fi
     if test ! -f "$SRC/Makefile" ; then
       AC_MSG_NOTICE([create TOP/Makefile guessed from local Makefile])
       x='`' ; cat >$tmp/conftemp.sed <<_EOF
 /^\$/n
 x
 /^\$/bS
 x
 /\\\\\$/{H;d;}
 {H;s/.*//;x;}
 bM
 :S
 x
 /\\\\\$/{h;d;}
 {h;s/.*//;x;}
 :M
 s/\\(\\n\\)	/\\1 /g
 /^	/d
 /^[[	 ]]*[[\\#]]/d
 /^VPATH *=/d
 s/^srcdir *=.*/srcdir = ./
 s/^top_srcdir *=.*/top_srcdir = ./
 /[[:=]]/!d
 /^\\./d
 dnl Now handle rules (i.e. lines containing ":" but not " = ").
 / = /b
 / .= /b
 /:/!b
 s/:.*/:/
 s/ /  /g
 s/ \\([[a-z]][[a-z-]]*[[a-zA-Z0-9]]\\)\\([[ :]]\\)/ \\1 \\1[]_ALL\\2/g
 s/^\\([[a-z]][[a-z-]]*[[a-zA-Z0-9]]\\)\\([[ :]]\\)/\\1 \\1[]_ALL\\2/
 s/  / /g
 /^all all[]_ALL[[ :]]/i\\
 all-configured : all[]_ALL
 dnl dist-all exists... and would make for dist-all-all
 s/ [[a-zA-Z0-9-]]*[]_ALL [[a-zA-Z0-9-]]*[]_ALL[]_ALL//g
 /[]_ALL[]_ALL/d
 a\\
 	@ HOST="\$(HOST)\" \\\\\\
 	; test ".\$\$HOST" = "." && HOST=$x sh $AUX/config.guess $x \\\\\\
 	; BUILD=$x grep "^#### \$\$HOST " Makefile | sed -e 's/.*|//' $x \\\\\\
 	; use=$x basename "\$\@" _ALL $x; n=$x echo \$\$BUILD | wc -w $x \\\\\\
 	; echo "MAKE \$\$HOST : \$\$n * \$\@"; if test "\$\$n" -eq "0" ; then : \\\\\\
 	; BUILD=$x grep "^####.*|" Makefile |tail -1| sed -e 's/.*|//' $x ; fi \\\\\\
 	; test ".\$\$BUILD" = "." && BUILD="." \\\\\\
 	; test "\$\$use" = "\$\@" && BUILD=$x echo "\$\$BUILD" | tail -1 $x \\\\\\
 	; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
 	; (cd "\$\$i" && test ! -f configure && \$(MAKE) \$\$use) || exit; done
 dnl special rule add-on: "dist" copies the tarball to $(PUB). (source tree)
 /dist[]_ALL *:/a\\
 	@ HOST="\$(HOST)\" \\\\\\
 	; test ".\$\$HOST" = "." && HOST=$x sh $AUX/config.guess $x \\\\\\
 	; BUILD=$x grep "^#### \$\$HOST " Makefile | sed -e 's/.*|//' $x \\\\\\
 	; found=$x echo \$\$BUILD | wc -w $x \\\\\\
 	; echo "MAKE \$\$HOST : \$\$found \$(PACKAGE)-\$(VERSION).tar.*" \\\\\\
 	; if test "\$\$found" -eq "0" ; then : \\\\\\
 	; BUILD=$x grep "^#### .*|" Makefile |tail -1| sed -e 's/.*|//' $x \\\\\\
 	; fi ; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
 	; for f in \$\$i/\$(PACKAGE)-\$(VERSION).tar.* \\\\\\
 	; do test -f "\$\$f" && mv "\$\$f" \$(PUB). ; done ; break ; done
 dnl special rule add-on: "dist-foo" copies all the archives to $(PUB). (source tree)
 /dist-[[a-zA-Z0-9]]*[]_ALL *:/a\\
 	@ HOST="\$(HOST)\" \\\\\\
 	; test ".\$\$HOST" = "." && HOST=$x sh ./config.guess $x \\\\\\
 	; BUILD=$x grep "^#### \$\$HOST " Makefile | sed -e 's/.*|//' $x \\\\\\
 	; found=$x echo \$\$BUILD | wc -w $x \\\\\\
 	; echo "MAKE \$\$HOST : \$\$found \$(PACKAGE)-\$(VERSION).*" \\\\\\
 	; if test "\$\$found" -eq "0" ; then : \\\\\\
 	; BUILD=$x grep "^#### .*|" Makefile |tail -1| sed -e 's/.*|//' $x \\\\\\
 	; fi ; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
 	; for f in \$\$i/\$(PACKAGE)-\$(VERSION).* \\\\\\
 	; do test -f "\$\$f" && mv "\$\$f" \$(PUB). ; done ; break ; done
 dnl special rule add-on: "distclean" removes all local builddirs completely
 /distclean[]_ALL *:/a\\
 	@ HOST="\$(HOST)\" \\\\\\
 	; test ".\$\$HOST" = "." && HOST=$x sh $AUX/config.guess $x \\\\\\
 	; BUILD=$x grep "^#### .*|" Makefile | sed -e 's/.*|//' $x \\\\\\
 	; use=$x basename "\$\@" _ALL $x; n=$x echo \$\$BUILD | wc -w $x \\\\\\
 	; echo "MAKE \$\$HOST : \$\$n * \$\@ (all local builds)" \\\\\\
 	; test ".\$\$BUILD" = "." && BUILD="." \\\\\\
 	; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
 	; echo "# rm -r \$\$i"; done ; echo "# (sleep 3)" ; sleep 3 \\\\\\
 	; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
 	; echo "\$\$i" | grep "^/" > /dev/null && continue \\\\\\
 	; echo "\$\$i" | grep "^../" > /dev/null && continue \\\\\\
 	; echo "rm -r \$\$i"; (rm -r "\$\$i") ; done ; rm Makefile
 _EOF
       cp "$tmp/conftemp.sed" "$SRC/makefile.sed~"            ## DEBUGGING
       $SED -f $tmp/conftemp.sed Makefile >$SRC/Makefile
       if test -f "$SRC/m4_ifval([$2],[$2],[END])" ; then
         AC_MSG_NOTICE([extend TOP/Makefile with TOP/m4_ifval([$2],[$2],[END])])
         cat $SRC/END >>$SRC/Makefile
       fi ; xxxx="####"
       echo "$xxxx CONFIGURATIONS FOR TOPLEVEL MAKEFILE: " >>$SRC/Makefile
       # sanity check
       if grep '^; echo "MAKE ' $SRC/Makefile >/dev/null ; then
         AC_MSG_NOTICE([buggy sed found - it deletes tab in "a" text parts])
         $SED -e '/^@ HOST=/s/^/	/' -e '/^; /s/^/	/' $SRC/Makefile \
           >$SRC/Makefile~
         (test -s $SRC/Makefile~ && mv $SRC/Makefile~ $SRC/Makefile) 2>/dev/null
       fi
     else
       xxxx="\\#\\#\\#\\#"
       # echo "/^$xxxx *$ax_enable_builddir_host /d" >$tmp/conftemp.sed
       echo "s!^$xxxx [[^|]]* | *$SUB *\$!$xxxx ...... $SUB!" >$tmp/conftemp.sed
       $SED -f "$tmp/conftemp.sed" "$SRC/Makefile" >$tmp/mkfile.tmp
         cp "$tmp/conftemp.sed" "$SRC/makefiles.sed~"         ## DEBUGGING
         cp "$tmp/mkfile.tmp"   "$SRC/makefiles.out~"         ## DEBUGGING
       if cmp -s "$SRC/Makefile" "$tmp/mkfile.tmp" 2>/dev/null ; then
         AC_MSG_NOTICE([keeping TOP/Makefile from earlier configure])
         rm "$tmp/mkfile.tmp"
       else
         AC_MSG_NOTICE([reusing TOP/Makefile from earlier configure])
         mv "$tmp/mkfile.tmp" "$SRC/Makefile"
       fi
     fi
     AC_MSG_NOTICE([build in $SUB (HOST=$ax_enable_builddir_host)])
     xxxx="####"
     echo "$xxxx" "$ax_enable_builddir_host" "|$SUB" >>$SRC/Makefile
   fi
 popdef([END])dnl
 AS_VAR_POPDEF([SED])dnl
 AS_VAR_POPDEF([AUX])dnl
 AS_VAR_POPDEF([SRC])dnl
 AS_VAR_POPDEF([TOP])dnl
 AS_VAR_POPDEF([SUB])dnl
 ],[dnl
 ax_enable_builddir_srcdir="$srcdir"                    # $srcdir
 ax_enable_builddir_host="$HOST"                        # $HOST / $host
 ax_enable_builddir_version="$VERSION"                  # $VERSION
 ax_enable_builddir_package="$PACKAGE"                  # $PACKAGE
 ax_enable_builddir_auxdir="$ax_enable_builddir_auxdir" # $AUX
 ax_enable_builddir_sed="$ax_enable_builddir_sed"       # $SED
 ax_enable_builddir="$ax_enable_builddir"               # $SUB
 ])dnl
 ])
	# ===========================================================================
	# https://www.gnu.org/software/autoconf-archive/ax_enable_builddir.html
	# ===========================================================================
	#
	# SYNOPSIS
	#
	# AX_ENABLE_BUILDDIR [(dirstring-or-command [,Makefile.mk [,-all]])]
	#
	# DESCRIPTION
	#
	# If the current configure was run within the srcdir then we move all
	# configure-files into a subdir and let the configure steps continue
	# there. We provide an option --disable-builddir to suppress the move into
	# a separate builddir.
	#
	# Defaults:
	#
	# $1 = $host (overridden with $HOST)
	# $2 = Makefile.mk
	# $3 = -all
	#
	# This macro must be called before AM_INIT_AUTOMAKE. It creates a default
	# toplevel srcdir Makefile from the information found in the created
	# toplevel builddir Makefile. It just copies the variables and
	# rule-targets, each extended with a default rule-execution that recurses
	# into the build directory of the current "HOST". You can override the
	# auto-detection through `config.guess` and build-time of course, as in
	#
	# make HOST=i386-mingw-cross
	#
	# which can of course set at configure time as well using
	#
	# configure --host=i386-mingw-cross
	#
	# After the default has been created, additional rules can be appended
	# that will not just recurse into the subdirectories and only ever exist
	# in the srcdir toplevel makefile - these parts are read from the $2 =
	# Makefile.mk file
	#
	# The automatic rules are usually scanning the toplevel Makefile for lines
	# like '#### $host \|$builddir' to recognize the place where to recurse
	# into. Usually, the last one is the only one used. However, almost all
	# targets have an additional "*-all" rule which makes the script to
	# recurse into _all_ variants of the current HOST (!!) setting. The "-all"
	# suffix can be overridden for the macro as well.
	#
	# a special rule is only given for things like "dist" that will copy the
	# tarball from the builddir to the sourcedir (or $(PUB)) for reason of
	# convenience.
	#
	# LICENSE
	#
	# Copyright (c) 2009 Guido U. Draheim <guidod@gmx.de>
	# Copyright (c) 2009 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
	#
	# This program is free software; you can redistribute it and/or modify it
	# under the terms of the GNU General Public License as published by the
	# Free Software Foundation; either version 3 of the License, or (at your
	# option) any later version.
	#
	# This program is distributed in the hope that it will be useful, but
	# WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
	# Public License for more details.
	#
	# You should have received a copy of the GNU General Public License along
	# with this program. If not, see <https://www.gnu.org/licenses/>.
	#
	# As a special exception, the respective Autoconf Macro's copyright owner
	# gives unlimited permission to copy, distribute and modify the configure
	# scripts that are the output of Autoconf when processing the Macro. You
	# need not follow the terms of the GNU General Public License when using
	# or distributing such scripts, even though portions of the text of the
	# Macro appear in them. The GNU General Public License (GPL) does govern
	# all other use of the material that constitutes the Autoconf Macro.
	#
	# This special exception to the GPL applies to versions of the Autoconf
	# Macro released by the Autoconf Archive. When you make and distribute a
	# modified version of the Autoconf Macro, you may extend this special
	# exception to the GPL to apply to your modified version as well.

	#serial 30

	AC_DEFUN([AX_ENABLE_BUILDDIR],[
	AC_REQUIRE([AC_CANONICAL_HOST])[]dnl
	AC_REQUIRE([AC_CANONICAL_TARGET])[]dnl
	AC_REQUIRE([AX_CONFIGURE_ARGS])[]dnl
	AC_REQUIRE([AM_AUX_DIR_EXPAND])[]dnl
	AC_BEFORE([$0],[AM_INIT_AUTOMAKE])dnl
	AS_VAR_PUSHDEF([SUB],[ax_enable_builddir])dnl
	AS_VAR_PUSHDEF([AUX],[ax_enable_builddir_auxdir])dnl
	AS_VAR_PUSHDEF([SED],[ax_enable_builddir_sed])dnl
	SUB="."
	AC_ARG_ENABLE([builddir], AS_HELP_STRING(
	[--disable-builddir],[disable automatic build in subdir of sources])
	,[SUB="$enableval"], [SUB="auto"])
	if test ".$ac_srcdir_defaulted" != ".no" ; then
	if test ".$srcdir" = ".." ; then
	if test -f config.status ; then
	AC_MSG_NOTICE(toplevel srcdir already configured... skipping subdir build)
	else
	test ".$SUB" = "." && SUB="."
	test ".$SUB" = ".no" && SUB="."
	test ".$TARGET" = "." && TARGET="$target"
	test ".$SUB" = ".auto" && SUB="m4_ifval([$1], [$1],[$TARGET])"
	if test ".$SUB" != ".." ; then # we know where to go and
	AS_MKDIR_P([$SUB])
	echo __.$SUB.__ > $SUB/conftest.tmp
	cd $SUB
	if grep __.$SUB.__ conftest.tmp >/dev/null 2>/dev/null ; then
	rm conftest.tmp
	AC_MSG_RESULT([continue configure in default builddir "./$SUB"])
	else
	AC_MSG_ERROR([could not change to default builddir "./$SUB"])
	fi
	srcdir=`echo "$SUB" \|
	sed -e 's,^\./,,;s,[[^/]]$,&/,;s,[[^/]]*/,../,g;s,[[/]]$,,;'`
	# going to restart from subdirectory location
	test -f $srcdir/config.log && mv $srcdir/config.log .
	test -f $srcdir/confdefs.h && mv $srcdir/confdefs.h .
	test -f $srcdir/conftest.log && mv $srcdir/conftest.log .
	test -f $srcdir/$cache_file && mv $srcdir/$cache_file .
	AC_MSG_RESULT(....exec $SHELL $srcdir/[$]0 "--srcdir=$srcdir" "--enable-builddir=$SUB" ${1+"[$]@"})
	case "[$]0" in # restart
	[[\\/]]* \| ?:[[\\/]]*) # Absolute name
	eval $SHELL "'[$]0'" "'--srcdir=$srcdir'" "'--enable-builddir=$SUB'" $ac_configure_args ;;
	*) eval $SHELL "'$srcdir/[$]0'" "'--srcdir=$srcdir'" "'--enable-builddir=$SUB'" $ac_configure_args ;;
	esac ; exit $?
	fi
	fi
	fi fi
	test ".$SUB" = ".auto" && SUB="."
	dnl ac_path_prog uses "set dummy" to override $@ which would defeat the "exec"
	AC_PATH_PROG(SED,gsed sed, sed)
	AUX="$am_aux_dir"
	AS_VAR_POPDEF([SED])dnl
	AS_VAR_POPDEF([AUX])dnl
	AS_VAR_POPDEF([SUB])dnl
	AC_CONFIG_COMMANDS([buildir],[dnl .............. config.status ..............
	AS_VAR_PUSHDEF([SUB],[ax_enable_builddir])dnl
	AS_VAR_PUSHDEF([TOP],[top_srcdir])dnl
	AS_VAR_PUSHDEF([SRC],[ac_top_srcdir])dnl
	AS_VAR_PUSHDEF([AUX],[ax_enable_builddir_auxdir])dnl
	AS_VAR_PUSHDEF([SED],[ax_enable_builddir_sed])dnl
	pushdef([END],[Makefile.mk])dnl
	pushdef([_ALL],[ifelse([$3],,[-all],[$3])])dnl
	SRC="$ax_enable_builddir_srcdir"
	if test ".$SUB" = ".." ; then
	if test -f "$TOP/Makefile" ; then
	AC_MSG_NOTICE([skipping TOP/Makefile - left untouched])
	else
	AC_MSG_NOTICE([skipping TOP/Makefile - not created])
	fi
	else
	if test -f "$SRC/Makefile" ; then
	a=`grep "^VERSION " "$SRC/Makefile"` ; b=`grep "^VERSION " Makefile`
	test "$a" != "$b" && rm "$SRC/Makefile"
	fi
	if test -f "$SRC/Makefile" ; then
	echo "$SRC/Makefile : $SRC/Makefile.in" > $tmp/conftemp.mk
	echo " []@ echo 'REMOVED,,,' >\$[]@" >> $tmp/conftemp.mk
	eval "${MAKE-make} -f $tmp/conftemp.mk 2>/dev/null >/dev/null"
	if grep '^REMOVED,,,' "$SRC/Makefile" >/dev/null
	then rm $SRC/Makefile ; fi
	cp $tmp/conftemp.mk $SRC/makefiles.mk~ ## DEBUGGING
	fi
	if test ! -f "$SRC/Makefile" ; then
	AC_MSG_NOTICE([create TOP/Makefile guessed from local Makefile])
	x='`' ; cat >$tmp/conftemp.sed <<_EOF
	/^\$/n
	x
	/^\$/bS
	x
	/\\\\\$/{H;d;}
	{H;s/.*//;x;}
	bM
	:S
	x
	/\\\\\$/{h;d;}
	{h;s/.*//;x;}
	:M
	s/\\(\\n\\) /\\1 /g
	/^ /d
	/^[[ ]]*[[\\#]]/d
	/^VPATH *=/d
	s/^srcdir =./srcdir = ./
	s/^top_srcdir =./top_srcdir = ./
	/[[:=]]/!d
	/^\\./d
	dnl Now handle rules (i.e. lines containing ":" but not " = ").
	/ = /b
	/ .= /b
	/:/!b
	s/:.*/:/
	s/ / /g
	s/ \\([[a-z]][[a-z-]]*[[a-zA-Z0-9]]\\)\\([[ :]]\\)/ \\1 \\1[]_ALL\\2/g
	s/^\\([[a-z]][[a-z-]]*[[a-zA-Z0-9]]\\)\\([[ :]]\\)/\\1 \\1[]_ALL\\2/
	s/ / /g
	/^all all[]_ALL[[ :]]/i\\
	all-configured : all[]_ALL
	dnl dist-all exists... and would make for dist-all-all
	s/ [[a-zA-Z0-9-]][]_ALL [[a-zA-Z0-9-]][]_ALL[]_ALL//g
	/[]_ALL[]_ALL/d
	a\\
	@ HOST="\$(HOST)\" \\\\\\
	; test ".\$\$HOST" = "." && HOST=$x sh $AUX/config.guess $x \\\\\\
	; BUILD=$x grep "^#### \$\$HOST " Makefile \| sed -e 's/.*\|//' $x \\\\\\
	; use=$x basename "\$\@" _ALL $x; n=$x echo \$\$BUILD \| wc -w $x \\\\\\
	; echo "MAKE \$\$HOST : \$\$n * \$\@"; if test "\$\$n" -eq "0" ; then : \\\\\\
	; BUILD=$x grep "^####.\|" Makefile \|tail -1\| sed -e 's/.\|//' $x ; fi \\\\\\
	; test ".\$\$BUILD" = "." && BUILD="." \\\\\\
	; test "\$\$use" = "\$\@" && BUILD=$x echo "\$\$BUILD" \| tail -1 $x \\\\\\
	; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
	; (cd "\$\$i" && test ! -f configure && \$(MAKE) \$\$use) \|\| exit; done
	dnl special rule add-on: "dist" copies the tarball to $(PUB). (source tree)
	/dist[]_ALL *:/a\\
	@ HOST="\$(HOST)\" \\\\\\
	; test ".\$\$HOST" = "." && HOST=$x sh $AUX/config.guess $x \\\\\\
	; BUILD=$x grep "^#### \$\$HOST " Makefile \| sed -e 's/.*\|//' $x \\\\\\
	; found=$x echo \$\$BUILD \| wc -w $x \\\\\\
	; echo "MAKE \$\$HOST : \$\$found \$(PACKAGE)-\$(VERSION).tar.*" \\\\\\
	; if test "\$\$found" -eq "0" ; then : \\\\\\
	; BUILD=$x grep "^#### .\|" Makefile \|tail -1\| sed -e 's/.\|//' $x \\\\\\
	; fi ; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
	; for f in \$\$i/\$(PACKAGE)-\$(VERSION).tar.* \\\\\\
	; do test -f "\$\$f" && mv "\$\$f" \$(PUB). ; done ; break ; done
	dnl special rule add-on: "dist-foo" copies all the archives to $(PUB). (source tree)
	/dist-[[a-zA-Z0-9]][]_ALL :/a\\
	@ HOST="\$(HOST)\" \\\\\\
	; test ".\$\$HOST" = "." && HOST=$x sh ./config.guess $x \\\\\\
	; BUILD=$x grep "^#### \$\$HOST " Makefile \| sed -e 's/.*\|//' $x \\\\\\
	; found=$x echo \$\$BUILD \| wc -w $x \\\\\\
	; echo "MAKE \$\$HOST : \$\$found \$(PACKAGE)-\$(VERSION).*" \\\\\\
	; if test "\$\$found" -eq "0" ; then : \\\\\\
	; BUILD=$x grep "^#### .\|" Makefile \|tail -1\| sed -e 's/.\|//' $x \\\\\\
	; fi ; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
	; for f in \$\$i/\$(PACKAGE)-\$(VERSION).* \\\\\\
	; do test -f "\$\$f" && mv "\$\$f" \$(PUB). ; done ; break ; done
	dnl special rule add-on: "distclean" removes all local builddirs completely
	/distclean[]_ALL *:/a\\
	@ HOST="\$(HOST)\" \\\\\\
	; test ".\$\$HOST" = "." && HOST=$x sh $AUX/config.guess $x \\\\\\
	; BUILD=$x grep "^#### .\|" Makefile \| sed -e 's/.\|//' $x \\\\\\
	; use=$x basename "\$\@" _ALL $x; n=$x echo \$\$BUILD \| wc -w $x \\\\\\
	; echo "MAKE \$\$HOST : \$\$n * \$\@ (all local builds)" \\\\\\
	; test ".\$\$BUILD" = "." && BUILD="." \\\\\\
	; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
	; echo "# rm -r \$\$i"; done ; echo "# (sleep 3)" ; sleep 3 \\\\\\
	; for i in \$\$BUILD ; do test ".\$\$i" = "." && continue \\\\\\
	; echo "\$\$i" \| grep "^/" > /dev/null && continue \\\\\\
	; echo "\$\$i" \| grep "^../" > /dev/null && continue \\\\\\
	; echo "rm -r \$\$i"; (rm -r "\$\$i") ; done ; rm Makefile
	_EOF
	cp "$tmp/conftemp.sed" "$SRC/makefile.sed~" ## DEBUGGING
	$SED -f $tmp/conftemp.sed Makefile >$SRC/Makefile
	if test -f "$SRC/m4_ifval([$2],[$2],[END])" ; then
	AC_MSG_NOTICE([extend TOP/Makefile with TOP/m4_ifval([$2],[$2],[END])])
	cat $SRC/END >>$SRC/Makefile
	fi ; xxxx="####"
	echo "$xxxx CONFIGURATIONS FOR TOPLEVEL MAKEFILE: " >>$SRC/Makefile
	# sanity check
	if grep '^; echo "MAKE ' $SRC/Makefile >/dev/null ; then
	AC_MSG_NOTICE([buggy sed found - it deletes tab in "a" text parts])
	$SED -e '/^@ HOST=/s/^/ /' -e '/^; /s/^/ /' $SRC/Makefile \
	>$SRC/Makefile~
	(test -s $SRC/Makefile~ && mv $SRC/Makefile~ $SRC/Makefile) 2>/dev/null
	fi
	else
	xxxx="\\#\\#\\#\\#"
	# echo "/^$xxxx *$ax_enable_builddir_host /d" >$tmp/conftemp.sed
	echo "s!^$xxxx [[^\|]]* \| $SUB \$!$xxxx ...... $SUB!" >$tmp/conftemp.sed
	$SED -f "$tmp/conftemp.sed" "$SRC/Makefile" >$tmp/mkfile.tmp
	cp "$tmp/conftemp.sed" "$SRC/makefiles.sed~" ## DEBUGGING
	cp "$tmp/mkfile.tmp" "$SRC/makefiles.out~" ## DEBUGGING
	if cmp -s "$SRC/Makefile" "$tmp/mkfile.tmp" 2>/dev/null ; then
	AC_MSG_NOTICE([keeping TOP/Makefile from earlier configure])
	rm "$tmp/mkfile.tmp"
	else
	AC_MSG_NOTICE([reusing TOP/Makefile from earlier configure])
	mv "$tmp/mkfile.tmp" "$SRC/Makefile"
	fi
	fi
	AC_MSG_NOTICE([build in $SUB (HOST=$ax_enable_builddir_host)])
	xxxx="####"
	echo "$xxxx" "$ax_enable_builddir_host" "\|$SUB" >>$SRC/Makefile
	fi
	popdef([END])dnl
	AS_VAR_POPDEF([SED])dnl
	AS_VAR_POPDEF([AUX])dnl
	AS_VAR_POPDEF([SRC])dnl
	AS_VAR_POPDEF([TOP])dnl
	AS_VAR_POPDEF([SUB])dnl
	],[dnl
	ax_enable_builddir_srcdir="$srcdir" # $srcdir
	ax_enable_builddir_host="$HOST" # $HOST / $host
	ax_enable_builddir_version="$VERSION" # $VERSION
	ax_enable_builddir_package="$PACKAGE" # $PACKAGE
	ax_enable_builddir_auxdir="$ax_enable_builddir_auxdir" # $AUX
	ax_enable_builddir_sed="$ax_enable_builddir_sed" # $SED
	ax_enable_builddir="$ax_enable_builddir" # $SUB
	])dnl
	])