dnl  Copyright (C) 2007-2008  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_QWT],[
AC_REQUIRE([CHECK_QT])dnl
AC_REQUIRE([AC_LINKER_OPTIONS])dnl

AC_CHECKING(for qwt)

AC_LANG_SAVE
AC_LANG_CPLUSPLUS

qwt_ok=yes

dnl where is qwt ?

AC_ARG_WITH(qwt,
    [  --with-qwt=DIR     directory path to QWT installation ],
    [QWTHOME="$withval"
      AC_MSG_RESULT("select $withval as path to QWT")
    ])

AC_ARG_WITH(qwt_inc,
    [  --with-qwt_inc=DIR   directory path to QWT includes ],
    [QWT_INCDIR="$withval"
      AC_MSG_RESULT("select $withval as path to QWT includes")
    ])

libqwt_name=qwt
if test -z $QWTHOME; then
  AC_MSG_RESULT(QWTHOME not defined)
  AC_MSG_NOTICE(Trying native Qwt...)
  exist_ok=no	
  if test "x$exist_ok" = "xno"; then
     for d in /usr /usr/local ; do
        for extension in qwt-qt4 qwt; do
           AC_CHECK_FILE(${d}/lib${LIB_LOCATION_SUFFIX}/lib${extension}.so,exist_ok=yes,exist_ok=no)
           if test "x$exist_ok" = "xyes"; then
              QWTHOME=$d
              AC_MSG_RESULT(lib${extension}.so detected in $d/lib)
              libqwt_name=${extension}
              dnl  break, libqwt-qt4.so is choosen before libqwt.so since it is surely the Qt4 version.
              break
           fi
        done
        if test "x$exist_ok" = "xyes"; then
           break
        fi
     done
  fi
  if test "x$exist_ok" = "xno"; then
     for d in `echo $LD_LIBRARY_PATH | sed -e "s/:/ /g"` ; do
        if test -f $d/libqwt.so ; then
           AC_MSG_RESULT(libqwt.so detected in $d)
           QWTHOME=$d
           QWTHOME=`echo ${QWTHOME} | sed -e "s,[[^/]]*$,,;s,/$,,;s,^$,.,"`
           exist_ok=yes
           break
        fi
     done
  fi
  if test "x$exist_ok" = "xyes"; then
     if test -z $QWT_INCDIR; then
        QWT_INCDIR=$QWTHOME"/include/qwt-qt4"
        if test ! -f $QWT_INCDIR/qwt.h ; then
          QWT_INCDIR=/usr/include/qwt
        fi
        if test ! -f $QWT_INCDIR/qwt.h ; then
          QWT_INCDIR=$QWTHOME"/include"
        fi
        if test ! -f $QWT_INCDIR/qwt.h ; then
          QWT_INCDIR=/usr/lib/qt4/include/qwt
        fi
     fi
  else
     qwt_ok=no
  fi
else
  AC_MSG_NOTICE(Trying Qwt from $QWTHOME ...)
  if test -z $QWT_INCDIR; then
     QWT_INCDIR="$QWTHOME/include"
  fi   	
fi

if test "x$qwt_ok" = xno -o ! -d "$QWTHOME" ; then
  AC_MSG_RESULT(no)
  AC_MSG_WARN(qwt not found)
  qwt_ok=no
else
  CPPFLAGS_old=$CPPFLAGS
  CPPFLAGS="$CPPFLAGS $QT_INCLUDES -I$QWT_INCDIR"

  AC_CHECK_HEADER(qwt.h,qwt_ok=yes,qwt_ok=no) 
  CPPFLAGS=$CPPFLAGS_old

  AC_MSG_CHECKING(include of qwt headers)

  if test "x$qwt_ok" = xno ; then
    AC_MSG_RESULT(no)
    AC_MSG_WARN(qwt not found)
  else
    AC_MSG_RESULT(yes)
    QWT_INCLUDES=-I$QWT_INCDIR
  fi

  #
  # test Qwt libraries
  #
  if test "x$qwt_ok" = "xyes" ; then
    AC_MSG_CHECKING(linking qwt library)

    LIBS_old=$LIBS
    LIBS="$LIBS $QT_LIBS"
    if test "x$QWTHOME" = "x/usr" ; then
      LIBS="$LIBS -l${libqwt_name}"
    else
      LIBS="$LIBS -L$QWTHOME/lib -l${libqwt_name}"
    fi

    CXXFLAGS_old=$CXXFLAGS
    CXXFLAGS="$CXXFLAGS $QT_INCLUDES $QWT_INCLUDES"

    AC_CACHE_VAL(salome_cv_lib_qwt,[
      AC_TRY_LINK(
#include <QApplication>
#include <qwt_plot.h>
,     int n;
      char **s;
      QApplication a(n, s);
      QwtPlot p;
      p.resize( 600, 400 );
      p.show();
      a.exec();,
      eval "salome_cv_lib_qwt=yes",eval "salome_cv_lib_qwt=no")
    ])
    qwt_ok="$salome_cv_lib_qwt"

    if  test "x$qwt_ok" = "xno" ; then
      AC_MSG_RESULT(unable to link with qwt library)
      AC_MSG_RESULT(QWTHOME environment variable may be wrong)
    else
      AC_MSG_RESULT(yes)
      if test "x$QWTHOME" = "x/usr" ; then
        QWT_LIBS=" -l${libqwt_name}"
      else
        QWT_LIBS="-L$QWTHOME/lib -l${libqwt_name}"
      fi
    fi

    LIBS=$LIBS_old
    CXXFLAGS=$CXXFLAGS_old
  fi
fi

AC_SUBST(QWT_INCLUDES)
AC_SUBST(QWT_LIBS)

AC_LANG_RESTORE

AC_MSG_RESULT(for qwt: $qwt_ok)

# Save cache
AC_CACHE_SAVE

])dnl
dnl