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# 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-dection 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 overriden 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 <http://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 23

AC_DEFUN([AX_ENABLE_BUILDDIR],[
AC_REQUIRE([AC_CANONICAL_HOST])[]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
       [/\\]*) 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