dnl GnuPG's check for Pth.

dnl       Copyright (C) 2003 Free Software Foundation, Inc.

dnl

dnl This file is free software; as a special exception the author gives

dnl unlimited permission to copy and/or distribute it, with or without

dnl modifications, as long as this notice is preserved.

dnl

dnl This file is distributed in the hope that it will be useful, but

dnl WITHOUT ANY WARRANTY, to the extent permitted by law; without even the

dnl implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

# GNUPG_PTH_VERSION_CHECK(REQUIRED)

# 

# If the version is sufficient, HAVE_PTH will be set to yes.

#

# Taken and modified from the m4 macros which come with Pth.

AC_DEFUN([GNUPG_PTH_VERSION_CHECK],

  [

    _pth_version=`$PTH_CONFIG --version | awk 'NR==1 {print [$]3}'`

    _req_version="ifelse([$1],,1.2.0,$1)"

    AC_MSG_CHECKING(for PTH - version >= $_req_version)

    for _var in _pth_version _req_version; do

        eval "_val=\"\$${_var}\""

        _major=`echo $_val | sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\([[ab.]]\)\([[0-9]]*\)/\1/'`

        _minor=`echo $_val | sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\([[ab.]]\)\([[0-9]]*\)/\2/'`

        _rtype=`echo $_val | sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\([[ab.]]\)\([[0-9]]*\)/\3/'`

        _micro=`echo $_val | sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\([[ab.]]\)\([[0-9]]*\)/\4/'`

        case $_rtype in

            "a" ) _rtype=0 ;;

            "b" ) _rtype=1 ;;

            "." ) _rtype=2 ;;

        esac

        _hex=`echo dummy | awk '{ printf("%d%02d%1d%02d", major, minor, rtype, micro); }' \

              "major=$_major" "minor=$_minor" "rtype=$_rtype" "micro=$_micro"`

        eval "${_var}_hex=\"\$_hex\""

    done

    have_pth=no

    if test ".$_pth_version_hex" != .; then

        if test ".$_req_version_hex" != .; then

            if test $_pth_version_hex -ge $_req_version_hex; then

                have_pth=yes

            fi

        fi

    fi

    if test $have_pth = yes; then

       AC_MSG_RESULT(yes)

       AC_MSG_CHECKING([whether PTH installation is sane])

       AC_CACHE_VAL(gnupg_cv_pth_is_sane,[

         _gnupg_pth_save_cflags=$CFLAGS

         _gnupg_pth_save_ldflags=$LDFLAGS

         _gnupg_pth_save_libs=$LIBS

         CFLAGS="$CFLAGS `$PTH_CONFIG --cflags`"

         LDFLAGS="$LDFLAGS `$PTH_CONFIG --ldflags`"

         LIBS="$LIBS `$PTH_CONFIG --libs --all`"

         AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pth.h>

                                         ],

                                         [[ pth_init ();]])],

                        gnupg_cv_pth_is_sane=yes,

                        gnupg_cv_pth_is_sane=no)

         CFLAGS=$_gnupg_pth_save_cflags

         LDFLAGS=$_gnupg_pth_save_ldflags

         LIBS=$_gnupg_pth_save_libs

       ])

       if test $gnupg_cv_pth_is_sane != yes; then

          have_pth=no

       fi

       AC_MSG_RESULT($gnupg_cv_pth_is_sane)

    else

       AC_MSG_RESULT(no)

    fi    

  ])

# GNUPG_PATH_PTH([MINIMUM_VERSION])

#

# On return $have_pth is set as well as HAVE_PTH is defined and

# PTH_CLFAGS and PTH_LIBS are AS_SUBST.

#

AC_DEFUN([GNUPG_PATH_PTH],

[ AC_ARG_WITH(pth-prefix,

             AC_HELP_STRING([--with-pth-prefix=PFX],

                           [prefix where GNU Pth is installed (optional)]),

     pth_config_prefix="$withval", pth_config_prefix="")

  if test x$pth_config_prefix != x ; then

     PTH_CONFIG="$pth_config_prefix/bin/pth-config"

  fi

  AC_PATH_PROG(PTH_CONFIG, pth-config, no)

  tmp=ifelse([$1], ,1.3.7,$1)

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

    GNUPG_PTH_VERSION_CHECK($tmp)

    if test $have_pth = yes; then      

       PTH_CFLAGS=`$PTH_CONFIG --cflags`

       PTH_LIBS=`$PTH_CONFIG --ldflags`

       PTH_LIBS="$PTH_LIBS `$PTH_CONFIG --libs --all`"

       AC_DEFINE(HAVE_PTH, 1,

                [Defined if the GNU Pth is available])

    fi

  fi

  AC_SUBST(PTH_CFLAGS)

  AC_SUBST(PTH_LIBS)

])