dnl Autoconf macros for libgcrypt

dnl       Copyright (C) 2002, 2004 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.

dnl AM_PATH_LIBGCRYPT([MINIMUM-VERSION,

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

dnl Test for libgcrypt and define LIBGCRYPT_CFLAGS and LIBGCRYPT_LIBS.

dnl MINIMUN-VERSION is a string with the version number optionalliy prefixed

dnl with the API version to also check the API compatibility. Example:

dnl version of libgcrypt is at least 1.2.5 *and* the API number is 1.  Using

dnl this features allows to prevent build against newer versions of libgcrypt

dnl with a changed API.

dnl

AC_DEFUN([AM_PATH_LIBGCRYPT],

[ AC_ARG_WITH(libgcrypt-prefix,

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

                           [prefix where LIBGCRYPT is installed (optional)]),

     libgcrypt_config_prefix="$withval", libgcrypt_config_prefix="")

  if test x$libgcrypt_config_prefix != x ; then

     if test x${LIBGCRYPT_CONFIG+set} != xset ; then

        LIBGCRYPT_CONFIG=$libgcrypt_config_prefix/bin/libgcrypt-config

     fi

  fi

  tmp=ifelse([$1], ,1:1.2.0,$1)

  if echo "$tmp" | grep ':' >/dev/null 2>/dev/null ; then

     req_libgcrypt_api=`echo "$tmp"     | sed 's/\(.*\):\(.*\)/\1/'`

     min_libgcrypt_version=`echo "$tmp" | sed 's/\(.*\):\(.*\)/\2/'`

  else

     req_libgcrypt_api=0

     min_libgcrypt_version="$tmp"

  fi

  AC_MSG_CHECKING(for LIBGCRYPT - version >= $min_libgcrypt_version)

  ok=no

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

    req_major=`echo $min_libgcrypt_version | \

               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\1/'`

    req_minor=`echo $min_libgcrypt_version | \

               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`

    req_micro=`echo $min_libgcrypt_version | \

               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\3/'`

    libgcrypt_config_version=`$LIBGCRYPT_CONFIG --version`

    major=`echo $libgcrypt_config_version | \

               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`

    minor=`echo $libgcrypt_config_version | \

               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`

    micro=`echo $libgcrypt_config_version | \

               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\3/'`

    if test "$major" -gt "$req_major"; then

        ok=yes

        if test "$major" -eq "$req_major"; then

            if test "$minor" -gt "$req_minor"; then

               ok=yes

            else

               if test "$minor" -eq "$req_minor"; then

                   if test "$micro" -ge "$req_micro"; then

                     ok=yes

                   fi

               fi

            fi

        fi

    fi

  fi

  if test $ok = yes; then

  else

    AC_MSG_RESULT(no)

  fi

  if test $ok = yes; then

     # If we have a recent libgcrypt, we should also check that the

     # API is compatible

     if test "$req_libgcrypt_api" -gt 0 ; then

        tmp=`$LIBGCRYPT_CONFIG --api-version 2>/dev/null || echo 0`

        if test "$tmp" -gt 0 ; then

           AC_MSG_CHECKING([LIBGCRYPT API version])

           if test "$req_libgcrypt_api" -eq "$tmp" ; then

           else

             ok=no

           fi

        fi

     fi

  fi

  if test $ok = yes; then

    LIBGCRYPT_CFLAGS=`$LIBGCRYPT_CONFIG --cflags`

    LIBGCRYPT_LIBS=`$LIBGCRYPT_CONFIG --libs`

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

  else

    LIBGCRYPT_CFLAGS=""

    LIBGCRYPT_LIBS=""

    ifelse([$3], , :, [$3])

  fi

  AC_SUBST(LIBGCRYPT_CFLAGS)

  AC_SUBST(LIBGCRYPT_LIBS)

])