##### http://autoconf-archive.cryp.to/ac_subdir_files.html
#
# SYNOPSIS
#
#   AC_SUBDIR_FILES [(SUBDIRS [, CASEPATTERN])]
#
# DESCRIPTION
#
#   Look into subdirs and copy the (real) files that match pattern into
#   the local directory. Preferably we use a symbolic link of course.
#   existing local files are not overwritten.
#
#   The default casepattern is "*.?|*.cc|*.cpp", the default
#   subdir-list contains all subdirs available.
#
# LAST MODIFICATION
#
#   2007-02-14
#
# COPYLEFT
#
#   Copyright (c) 2007 Guido U. Draheim <guidod@gmx.de>
#
#   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 2 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, write to the Free Software
#   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
#   02111-1307, USA.
#
#   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 Macro 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.

AC_DEFUN([AC_SUBDIR_FILES],
[AC_BEFORE($0,[AC_PROG_CP_S])
  for ac_subdir in ifelse([$1], , *, $1) ; do
    if test -d $ac_subdir ; then
      AC_MSG_CHECKING(subdir $ac_subdir)
      for ac_file in $ac_subdir/* ; do
	if test -f $ac_file ; then
	  if test ! -e `basename $ac_file` ; then
	    case `basename $ac_file` in
	      ifelse([$2], , *.?|*.cc|*.cpp,[$1]))
		echo ${ECHO_N} "$ac_file," ;
                $CP_S $ac_file . ;;
            esac
          fi
        fi
      done
      AC_MSG_RESULT(;)
    fi
  done
])