dnl

dnl Copyright 2007,2008 Free Software Foundation, Inc.

dnl 

dnl This file is part of GNU Radio

dnl 

dnl GNU Radio is free software; you can redistribute it and/or modify

dnl it under the terms of the GNU General Public License as published by

dnl the Free Software Foundation; either version 3, or (at your option)

dnl any later version.

dnl 

dnl GNU Radio 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

dnl GNU General Public License for more details.

dnl 

dnl You should have received a copy of the GNU General Public License

dnl along with GNU Radio; see the file COPYING.  If not, write to

dnl the Free Software Foundation, Inc., 51 Franklin Street,

dnl Boston, MA 02110-1301, USA.

dnl

dnl Configure paths for library qwt.

dnl

dnl GR_QWT([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])

dnl

dnl Test for library qwt, set QWT_CFLAGS and QWT_LIBS if found. Assumes 

dnl QT_CFLAGS and QT_LIBS have already been correctly set.

dnl

AC_DEFUN([GR_QWT],

[

    dnl QWT Library Version

    QWT_LIBRARY1=-lqwt-qt4

    QWT_LIBRARY2=-lqwt

    dnl Save the environment

    AC_LANG_PUSH(C++)

    qwt_save_CPPFLAGS="$CPPFLAGS"

    qwt_save_LIBS="$LIBS"

    libqwt_ok=yes

    dnl QWT Info

    dnl Allow user to specify where QWT files are

    AC_ARG_WITH([qwt-libdir],

		[  --with-qwt-libdir=path  Prefix where QWT library is installed (optional)],

		[qwt_libdir="$withval"], [qwt_libdir=""])

    AC_ARG_WITH([qwt-incdir],

		[  --with-qwt-incdir=path  Prefix where QWT include files are (optional)],

		[qwt_incdir="$withval"], [qwt_incdir=""])

    AC_ARG_WITH([qwt-lib],

		[  --with-qwt-lib=library  QWT library name (optional)],

		[qwt_lib="$withval"], [qwt_lib=""])

    dnl Check for presence of header files

    dnl if not user-specified, try the first include dir (Ubuntu), then

    dnl try the second include dir (Fedora)

    CPPFLAGS="$CPPFLAGS $QTCORE_CFLAGS"

    dnl if not set by user

    if test "$qwt_incdir" = "" ; then

        dnl check qwt-qt4/qwt.h (as in Ubuntu)

        AC_CHECK_HEADER(

            [qwt-qt4/qwt_math.h],

            [qwt_qt4_qwt_h=yes],

            [qwt_qt4_qwt_h=no]

        )

        dnl If it was found, set the flags and move on

        if test "$qwt_qt4_qwt_h" = "yes" ; then

            QWT_CFLAGS="$QWT_CFLAGS -I/usr/include/qwt-qt4"

        else

            dnl check qwt/qwt.h (as in Fedora)

            AC_CHECK_HEADER(

                [qwt/qwt_math.h],

	        [qwt_qwt_h=yes],

                [qwt_qwt_h=no]

            )

            dnl if it was found, set the flags and move on

            if test "$qwt_qwt_h" = "yes" ; then

                QWT_CFLAGS="$QWT_CFLAGS -I/usr/include/qwt"

            else

                dnl otherwise, qwt.h wasn't found, so set the flag to no

                libqwt_ok=no

            fi

        fi

    else

	dnl Using the user-specified include directory

	QWT_CFLAGS="$QWT_CFLAGS -I$qwt_incdir"

        AC_CHECK_HEADER(

            [$qwt_incdir/qwt.h],

	    [],

	    [libqwt_ok=no])

    fi

    dnl Don't bother going on if we can't find the headers

    if test "$libqwt_ok" = "yes" ; then

        dnl Check for QWT library (qwt or qwt-qt4)

        dnl User-defined QWT library path

        if test "$qwt_libdir" != "" ; then

            QWT_LIBS="-L$qwt_libdir $QWT_LIBS"

        fi

        dnl temporarily set these so the AC_CHECK_LIB works

        CPPFLAGS="$CPPFLAGS $QWT_CFLAGS"

        LIBS="$qwt_save_LIBS $QT_LIBS $QWT_LIBS -lqwt"

        dnl If the user specified a qwt library name, use it here

        if test "$qwt_lib" != "" ; then

            AC_CHECK_LIB([$qwt_lib], [main], [libqwt_ok=yes], [libqwt_ok=no])

        else            

            dnl Check for 'main' in libqwt (Fedora)

            AC_CHECK_LIB([qwt], [main], [libqwt_ok=yes], [libqwt_ok=no])

            dnl If library found properly, set the flag and move on

            if test "$libqwt_ok" = "yes" ; then

                QWT_LIBS="$QWT_LIBS -lqwt"

            else

                dnl Otherwise, check for 'main' in libqwt-qt4 (Ubuntu)

                LIBS="$qwt_save_LIBS $QT_LIBS $QWT_LIBS -lqwt-qt4"

                AC_CHECK_LIB([qwt-qt4], [main], [libqwt_ok=yes], [libqwt_ok=no])

                if test "$libqwt_ok" = "yes" ; then

                    QWT_LIBS="$QWT_LIBS -lqwt-qt4"

                else

                    AC_MSG_RESULT([Could not link to libqwt.so])

                fi

            fi

        fi

    else

        AC_MSG_RESULT([Could not find qwt headers])

    fi

    dnl Restore saved variables

    LIBS="$qwt_save_LIBS"

    CPPFLAGS="$qwt_save_CPPFLAGS"

    AC_LANG_POP

    dnl Execute user actions

    if test "x$libqwt_ok" = "xyes" ; then

	ifelse([$1], , :, [$1])

    else

	QWT_CFLAGS=""

	QWT_LIBDIRS=""

	ifelse([$2], , :, [$2])

    fi

    dnl Export our variables

    AC_SUBST(QWT_CFLAGS)

    AC_SUBST(QWT_LIBS)

])