dnl  Copyright (C) 2003  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
dnl  CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS 
dnl 
dnl  This library is free software; you can redistribute it and/or 
dnl  modify it under the terms of the GNU Lesser General Public 
dnl  License as published by the Free Software Foundation; either 
dnl  version 2.1 of the License. 
dnl 
dnl  This library is distributed in the hope that it will be useful, 
dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of 
dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
dnl  Lesser General Public License for more details. 
dnl 
dnl  You should have received a copy of the GNU Lesser General Public 
dnl  License along with this library; if not, write to the Free Software 
dnl  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA 
dnl 
dnl  See http://www.opencascade.org/SALOME/ or email : webmaster.salome@opencascade.org 
dnl
dnl
dnl
AC_DEFUN([CHECK_METIS],[

AC_CHECKING(for METIS Library)

AC_LANG_SAVE
AC_LANG_C

METIS_CPPFLAGS=""
METIS_LIBSUFFIX=""
METIS_LIBS=""
ENABLE_METIS="no"

AC_CHECKING(for METIS location)
AC_ARG_WITH(metis,
            [  --with-metis=DIR      root directory path to METIS library installation ],
            [METISDIR="$withval"
             AC_MSG_RESULT("select $withval as path to METIS library")])

AC_MSG_RESULT(\$METISDIR = ${METISDIR})

CPPFLAGS_old="${CPPFLAGS}"
LIBS_old=$LIBS

if test "x${METISDIR}" != "x" ; then
  METIS_CPPFLAGS="-DENABLE_METIS -I${METISDIR}/Lib"
  METIS_LIBS="-L${METISDIR} -lmetis"
fi

metis_ok=no
metis_headers_ok=no
metis_binaries_ok=no

dnl METIS headers
AC_CHECKING(for METIS headers)
CPPFLAGS="${CPPFLAGS_old} ${METIS_CPPFLAGS}"

metis_include_dir_ok=yes
if test "x${METISDIR}" != "x" ; then
  AC_CHECK_FILE(${METISDIR}/Lib/metis.h,
                metis_include_dir_ok=yes,
                metis_include_dir_ok=no)
fi

if test "x${metis_include_dir_ok}" = "xyes" ; then
  AC_TRY_COMPILE([#include <metis.h>],
                 [Change2CNumbering(0,0,0)],
                 metis_headers_ok=yes,
                 metis_headers_ok=no)
fi

if test "x${metis_headers_ok}" = "xno" ; then
  METIS_CPPFLAGS="METIS_CPPFLAGS_NOT_DEFINED"
else
  AC_MSG_RESULT(\$METIS_CPPFLAGS = ${METIS_CPPFLAGS})
fi
AC_MSG_RESULT(for metis headers: $metis_headers_ok)

if test "x${metis_headers_ok}" = "xyes" ; then
  dnl METIS binaries
  AC_CHECKING(for METIS binaries)
  metis_lib_dir_ok=yes
  if test "x${METISDIR}" != "x" ; then
    AC_CHECK_FILE(${METISDIR}/libmetis.a,
                  metis_lib_dir_ok=yes,
                  metis_lib_dir_ok=no)
    if test "x${metis_lib_dir_ok}" = "xno" ; then
      METIS_LIBSUFFIX=""
      AC_CHECK_FILE(${METISDIR}/libmetis.a,
                    metis_lib_dir_ok=yes,
                    metis_lib_dir_ok=no)
    fi
  fi
  if test "x${metis_lib_dir_ok}" = "xyes" ; then
    LIBS="${LIBS_old} ${METIS_LIBS}"
    AC_TRY_LINK([#include <metis.h>],
                [Change2CNumbering(0,0,0)],
                metis_binaries_ok=yes,
                metis_binaries_ok=no)
    if test "x${metis_binaries_ok}" = "xno" ; then
      METIS_LIBSUFFIX=""
      LIBS="${LIBS_old} ${METIS_LIBS} "
      AC_TRY_LINK([#include <metis.h>],
                  [Change2CNumbering(0,0,0)],
                  metis_binaries_ok=yes,
                  metis_binaries_ok=no)
    fi
  fi
fi

if test "x${metis_binaries_ok}" = "xno" ; then
  METIS_LIBS="METIS_LIBS_NOT_FOUND"
  METIS_LIBSUFFIX="-not-defined"
else
  AC_MSG_RESULT(\$METIS_LIBSUFFIX = ${METIS_LIBSUFFIX})
  AC_MSG_RESULT(\$METIS_LIBS = ${METIS_LIBS})
fi
AC_MSG_RESULT(for metis binaries: $metis_binaries_ok)

CPPFLAGS="${CPPFLAGS_old}"
LIBS="${LIBS_old}"

if test "x${metis_headers_ok}" = "xyes" ; then
  if test "x${metis_binaries_ok}" = "xyes" ; then
    metis_ok=yes
    ENABLE_METIS="yes"
  fi
fi

AC_MSG_RESULT(for metis: $metis_ok)

AC_SUBST(METIS_CPPFLAGS)
AC_SUBST(METIS_LIBSUFFIX)
AC_SUBST(METIS_LIBS)
AC_SUBST(ENABLE_METIS)

AC_LANG_RESTORE

])dnl