dnl Check for MPFR and dependencies

dnl Copyright (C) 2004, 2005 Free Software Foundation, Inc.

dnl

dnl This file is free software, distributed under the terms of the GNU

dnl General Public License.  As a special exception to the GNU General

dnl Public License, this file may be distributed as part of a program

dnl that contains a configuration script generated by Autoconf, under

dnl the same distribution terms as the rest of that program.

dnl

dnl Defines HAVE_MPFR to 1 if a working MPFR/GMP setup is

dnl found, and sets @LIBMPFR@ to the necessary libraries.

AC_DEFUN([GNUPG_CHECK_MPFR],

[

  AC_ARG_WITH([mpfr],

     AC_HELP_STRING([--with-mpfr=DIR],

	[look for the mpfr and gmp libraries in DIR]),

     [_do_mpfr=$withval],[_do_mpfr=yes])

  if test "$_do_mpfr" != "no" ; then

     if test -d "$withval" ; then

        CPPFLAGS="${CPPFLAGS} -I$withval/include"

        LDFLAGS="${LDFLAGS} -L$withval/lib"

     fi

        _mpfr_save_libs=$LIBS

        _combo="-lmpfr -lgmp"

        LIBS="$LIBS $_combo"

        AC_MSG_CHECKING([whether mpfr via \"$_combo\" is present and usable])

        AC_LINK_IFELSE([

	AC_LANG_PROGRAM([

#include <stdio.h>

#include <mpfr.h>

#include <gmp.h>

],[

mpfr_t p;

mpz_t z;

mpfr_init(p);

mpz_init(z);

mpfr_printf("%Rf%Zd", p, z);

mpfr_clear(p);

mpz_clear(z);

])],_found_mpfr=yes,_found_mpfr=no)

        AC_MSG_RESULT([$_found_mpfr])

        LIBS=$_mpfr_save_libs

        if test $_found_mpfr = yes ; then

           AC_DEFINE(HAVE_MPFR,1,

	      [Define to 1 if you have fully functional mpfr and gmp libraries.])

           AC_SUBST(LIBMPFR,$_combo)

           break

        fi

     unset _mpfr_save_libs

     unset _combo

     unset _found_mpfr

  fi

])dnl