dnl Copyright (C) 2007-2012  CEA/DEN, EDF R&D, OPEN CASCADE
dnl
dnl Copyright (C) 2003-2007  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.salome-platform.org/ or email : webmaster.salome@opencascade.com
dnl

AC_DEFUN([CHECK_CGNS],[
AC_REQUIRE([AC_PROG_CC])dnl
AC_REQUIRE([AC_PROG_CPP])dnl
AC_REQUIRE([CHECK_HDF5])dnl

AC_CHECKING(for CGNS)

AC_ARG_WITH(cgns,
    [  --with-cgns=DIR                 root directory path to CGNS installation ],
    [CGNSHOME="$withval"
      AC_MSG_RESULT("select $withval as path to CGNS")
    ])

AC_SUBST(CGNS_INCLUDES)
AC_SUBST(CGNS_LIBS)

CGNS_INCLUDES=""
CGNS_LIBS=""

cgns_ok=no

LOCAL_INCLUDES=""
LOCAL_LIBS="-lcgns $HDF5_LIBS"

if test "x$CGNSHOME" != "xno"; then
    if test "x$CGNSHOME" == "xyes"; then
        CGNSHOME=""
    fi
    if test -z $CGNSHOME
    then
        AC_MSG_WARN(undefined CGNSHOME variable which specify CGNS library installation directory)
        AC_PATH_PROG(BINDIR, cgnsversion)
        if test "x$BINDIR" != "x" ; then
            CGNSHOME=$BINDIR
            CGNSHOME=`echo ${CGNSHOME} | sed -e "s,[[^/]]*$,,;s,/$,,;s,^$,.,"`
            CGNSHOME=`echo ${CGNSHOME} | sed -e "s,[[^/]]*$,,;s,/$,,;s,^$,.,"`
        fi
    fi
    if test ! -z $CGNSHOME
    then
        LOCAL_INCLUDES="-I$CGNSHOME/include"
        if test "x$CGNSHOME" != "x/usr"; then
            LOCAL_LIBS="-L$CGNSHOME/lib $LOCAL_LIBS"
        fi
    fi

dnl check cgnslib header

    CPPFLAGS_old=$CPPFLAGS
    CPPFLAGS="$CPPFLAGS $LOCAL_INCLUDES"

    AC_CHECK_HEADER(cgnslib.h,cgns_ok=yes ,cgns_ok=no)

    CPPFLAGS=$CPPFLAGS_old
fi

if  test "x$cgns_ok" = "xyes"
then

dnl check cgns library

  LIBS_old="$LIBS"
  LIBS="$LIBS $LOCAL_LIBS"
  AC_CHECK_LIB(cgns,cg_open,cgns_ok=yes,cgns_ok=no)

  LIBS="$LIBS_old"
 
fi

if  test "x$cgns_ok" = "xyes"
then
  CGNS_LIBS="$LOCAL_LIBS"
  CGNS_INCLUDES="$LOCAL_INCLUDES"
  CPPFLAGS="-DWITH_CGNS $CPPFLAGS"
fi

AC_MSG_RESULT(for CGNS: $cgns_ok)

AM_CONDITIONAL(WITH_CGNS, [test x"$cgns_ok" = xyes])

])dnl