dnl as-libtool-tags.m4 0.1.4

dnl autostars m4 macro for selecting libtool "tags" (languages)

dnl Andy Wingo does not claim credit for this macro

dnl backported from libtool 1.6 by Paolo Bonzini

dnl see http://lists.gnu.org/archive/html/libtool/2003-12/msg00007.html

dnl $Id$

dnl AS_LIBTOOL_TAGS([tags...])

dnl example

dnl AS_LIBTOOL_TAGS([]) for only C (no fortran, etc)

dnl When AC_LIBTOOL_TAGS is used, I redefine _LT_AC_TAGCONFIG

dnl to be more similar to the libtool 1.6 implementation, which

dnl uses an m4 loop and m4 case instead of a shell loop.  This

dnl way the CXX/GCJ/F77/RC tests are not always expanded.

dnl AS_LIBTOOL_TAGS

dnl ---------------

dnl tags to enable

AC_DEFUN([AS_LIBTOOL_TAGS],

[m4_define([_LT_TAGS],[$1])

m4_define([_LT_AC_TAGCONFIG], [

  # redefined LT AC TAGCONFIG

  if test -f "$ltmain"; then

    if test ! -f "${ofile}"; then

      AC_MSG_WARN([output file `$ofile' does not exist])

    fi

    if test -z "$LTCC"; then

      eval "`$SHELL ${ofile} --config | grep '^LTCC='`"

      if test -z "$LTCC"; then

        AC_MSG_WARN([output file `$ofile' does not look like a libtool script])

      else

        AC_MSG_WARN([using `LTCC=$LTCC', extracted from `$ofile'])

      fi

    fi

    AC_FOREACH([_LT_TAG], _LT_TAGS,

      echo THOMAS: tag _LT_TAG

      [m4_case(_LT_TAG,

      [CXX], [

    if test -n "$CXX" && test "X$CXX" != "Xno"; then

      echo "THOMAS: YAY CXX"

      AC_LIBTOOL_LANG_CXX_CONFIG

      available_tags="$available_tags _LT_TAG"

    fi],

      [F77], [

    if test -n "$F77" && test "X$F77" != "Xno"; then

      AC_LIBTOOL_LANG_F77_CONFIG

      available_tags="$available_tags _LT_TAG"

    fi],

      [GCJ], [

    if test -n "$GCJ" && test "X$GCJ" != "Xno"; then

      AC_LIBTOOL_LANG_GCJ_CONFIG

      available_tags="$available_tags _LT_TAG"

    fi],

      [RC], [

    if test -n "$RC" && test "X$RC" != "Xno"; then

      AC_LIBTOOL_LANG_RC_CONFIG

      available_tags="$available_tags _LT_TAG"

    fi],

      [m4_errprintn(m4_location[: error: invalid tag name: ]"_LT_TAG")

      m4_exit(1)])

    ])

    echo THOMAS: available tags: $available_tags

  fi

  # Now substitute the updated list of available tags.

  if eval "sed -e 's/^available_tags=.*\$/available_tags=\"$available_tags\"/' \"$ofile\" > \"${ofile}T\""; then

    mv "${ofile}T" "$ofile"

    chmod +x "$ofile"

    AC_MSG_NOTICE([updated available libtool tags with $available_tags.])

  else

    rm -f "${ofile}T"

    AC_MSG_ERROR([unable to update list of available tagged configurations.])

  fi

])dnl _LT_AC_TAG_CONFIG

])