# libgcrypt.m4 - Autoconf macros to detect libgcrypt

# Copyright (C) 2002, 2003, 2004, 2011, 2014 g10 Code GmbH

#

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

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

# modifications, as long as this notice is preserved.

#

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

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

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

#

# Last-changed: 2014-10-02

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 MINIMUM-VERSION is a string with the version number optionalliy prefixed

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

dnl a MINIMUM-VERSION of 1:1.2.5 won't pass the test unless the installed

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

dnl this feature prevents building against newer versions of libgcrypt

dnl with a changed API.

dnl

dnl If a prefix option is not used, the config script is first

dnl searched in $SYSROOT/bin and then along $PATH.  If the used

dnl config script does not match the host specification the script

dnl is added to the gpg_config_script_warn variable.

dnl

AC_DEFUN([AM_PATH_LIBGCRYPT],

[ AC_REQUIRE([AC_CANONICAL_HOST])

  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}" = x ; then

     if test x"${libgcrypt_config_prefix}" != x ; then

        LIBGCRYPT_CONFIG="${libgcrypt_config_prefix}/bin/libgcrypt-config"

     else

       case "${SYSROOT}" in

         /*)

           if test -x "${SYSROOT}/bin/libgcrypt-config" ; then

             LIBGCRYPT_CONFIG="${SYSROOT}/bin/libgcrypt-config"

           fi

           ;;

         '')

           ;;

          *)

           AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])

           ;;

       esac

     fi

  fi

  AC_PATH_PROG(LIBGCRYPT_CONFIG, libgcrypt-config, no)

  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

    else

        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

    AC_MSG_RESULT([yes ($libgcrypt_config_version)])

  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

             AC_MSG_RESULT([okay])

           else

             ok=no

             AC_MSG_RESULT([does not match. want=$req_libgcrypt_api got=$tmp])

           fi

        fi

     fi

  fi

  if test $ok = yes; then

    LIBGCRYPT_CFLAGS=`$LIBGCRYPT_CONFIG --cflags`

    LIBGCRYPT_LIBS=`$LIBGCRYPT_CONFIG --libs`

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

    libgcrypt_config_host=`$LIBGCRYPT_CONFIG --host 2>/dev/null || echo none`

    if test x"$libgcrypt_config_host" != xnone ; then

      if test x"$libgcrypt_config_host" != x"$host" ; then

  AC_MSG_WARN([[

***

*** The config script $LIBGCRYPT_CONFIG was

*** built for $libgcrypt_config_host and thus may not match the

*** used host $host.

*** You may want to use the configure option --with-libgcrypt-prefix

*** to specify a matching config script or use \$SYSROOT.

***]])

        gpg_config_script_warn="$gpg_config_script_warn libgcrypt"

      fi

    fi

  else

    LIBGCRYPT_CFLAGS=""

    LIBGCRYPT_LIBS=""

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

  fi

  AC_SUBST(LIBGCRYPT_CFLAGS)

  AC_SUBST(LIBGCRYPT_LIBS)

])