AX_ENABLE_BUILDDIR_UNAME [(dirstring-or-command [,Makefile.mk])]
, 

2005-12-03

Guido U. Draheim

GPLWithACException
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. 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

guidod's Miscellaneous (released)

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 = $build (defaults to `uname -msr`.d)
 $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 "BUILD". You can override the auto-dection through `uname -msr | tr " /" "__"`.d at build-time of course, as in

 make BUILD=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 '#### $build |$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 BUILD (!!) 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.

AC_DEFUN([AX_ENABLE_BUILDDIR_UNAME],[
AC_REQUIRE([AC_CANONICAL_HOST])[]dnl
AC_REQUIRE([AX_CONFIGURE_ARGS])[]dnl
AC_BEFORE([$0],[AM_INIT_AUTOMAKE])dnl
AS_VAR_PUSHDEF([SUB],[ax_enable_builddir])dnl
AS_VAR_PUSHDEF([SED],[ax_enable_builddir_sed])dnl
SUB="."
AC_ARG_ENABLE([builddir], AC_HELP_STRING(
  [--disable-builddir],[disable automatic build in subdir of sources])
  ,[SUB="$enableval"], [SUB="yes"])
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 ".$BUILD" = "." && BUILD=`uname -msr | tr " /" "__"`.d
    test ".$SUB" = ".yes" && SUB="m4_ifval([$1], [$1],[$BUILD])"
    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" $ac_configure_args)
      case "[$]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
dnl ac_path_prog uses "set dummy" to override $@ which would defeat the "exec"
AC_PATH_PROG(SED,gsed sed, sed)
AS_VAR_POPDEF([SED])dnl
AS_VAR_POPDEF([SUB])dnl
AC_CONFIG_COMMANDS([buildir],[dnl .............. config.status ..............
AS_VAR_PUSHDEF([SUB],[ax_enable_builddir])dnl
AS_VAR_PUSHDEF([TOP],[top_srcdir])dnl
AS_VAR_PUSHDEF([SRC],[ac_top_srcdir])dnl
AS_VAR_PUSHDEF([SED],[ax_enable_builddir_sed])dnl
pushdef([END],[Makefile.mk])dnl
  SRC="$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
    AC_MSG_NOTICE([create TOP/Makefile guessed from local Makefile])
     x='`' ; cat >$tmp/conftemp.sed <<_EOF
/^\$/n
x
/^\$/bS
x
/\\\\\$/{H;d;}
{H;s/.*//;x;}
bM
:S
x
/\\\\\$/{h;d;}
{h;s/.*//;x;}
:M
s/\\(\\n\\)	/\\1 /g
/^	/d
/^[[ 	]]*[[\\#]]/d
/^VPATH *=/d
s/^srcdir *=.*/srcdir = ./
s/^top_srcdir *=.*/top_srcdir = ./
/[[:=]]/!d
/^\\./d
s/:.*/:/
/:\$/s/ /  /g
/:\$/s/  / /g
/^.*[[=]]/!s%\$% ; (cd \$(BUILD) \\&\\& \$(ISNOTSRCDIR) \\&\\& \$(MAKE) "\$\@") || exit ; \$(MAKE) done "RULE=\$\@"%
_EOF
    test ".$USE_MAINTAINER_MODE" = ".no" || \
  	cp "$tmp/conftemp.sed" "$SRC/makefile.sed~"            ## DEBUGGING
    echo 'BUILD=`uname -msr | tr " /" "__"`.d' >$SRC/Makefile
    echo 'ISNOTSRCDIR=test ! -f configure' >>$SRC/Makefile
    $SED -f $tmp/conftemp.sed Makefile >>$SRC/Makefile
    echo 'done: ;@ if grep "$(RULE)-done .*:" Makefile > /dev/null; then dnl
    echo $(MAKE) $(RULE)-done ; $(MAKE) $(RULE)-done ; else true ; fi' dnl
    >> $SRC/Makefile
    if test -f "$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 
    AC_MSG_NOTICE([make uses BUILD=$SUB (on $ax_enable_builddir_host:)])
  fi
popdef([END])dnl
AS_VAR_POPDEF([SED])dnl
AS_VAR_POPDEF([SRC])dnl
AS_VAR_POPDEF([TOP])dnl
AS_VAR_POPDEF([SUB])dnl
],[dnl
ax_enable_builddir_srcdir="$srcdir"                    # $srcdir
ax_enable_builddir_host="$HOST"                        # $HOST / $host
ax_enable_builddir_version="$VERSION"                  # $VERSION
ax_enable_builddir_package="$PACKAGE"                  # $PACKAGE
ax_enable_builddir_sed="$ax_enable_builddir_sed"       # $SED
ax_enable_builddir="$ax_enable_builddir"               # $SUB
])dnl
])