# npth.m4 - autoconf macro to detect NPTH.

# Copyright (C) 2002, 2003, 2004, 2011 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.

AC_DEFUN([_AM_PATH_NPTH_CONFIG],

[ AC_ARG_WITH(npth-prefix,

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

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

     npth_config_prefix="$withval", npth_config_prefix="")

  if test "x$npth_config_prefix" != x ; then

      NPTH_CONFIG="$npth_config_prefix/bin/npth-config"

  fi

  AC_PATH_PROG(NPTH_CONFIG, npth-config, no)

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

    npth_version=`$NPTH_CONFIG --version`

  fi

  npth_version_major=`echo $npth_version | \

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

  npth_version_minor=`echo $npth_version | \

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

])

dnl AM_PATH_NPTH([MINIMUM-VERSION,

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

dnl Test for libnpth and define NPTH_CFLAGS and NPTH_LIBS.

dnl

AC_DEFUN([AM_PATH_NPTH],

[ AC_REQUIRE([_AM_PATH_NPTH_CONFIG])dnl

  tmp=ifelse([$1], ,1:0.91,$1)

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

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

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

  else

     req_npth_api=1

     min_npth_version="$tmp"

  fi

  AC_MSG_CHECKING(for NPTH - version >= $min_npth_version)

  ok=no

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

    req_major=`echo $min_npth_version | \

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

    req_minor=`echo $min_npth_version | \

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

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

        ok=yes

    else

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

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

               ok=yes

            else

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

                  ok=yes

               fi

            fi

        fi

    fi

  fi

  if test $ok = yes; then

    AC_MSG_RESULT([yes ($npth_version)])

  else

    AC_MSG_RESULT(no)

  fi

  if test $ok = yes; then

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

     # API is compatible.

     if test "$req_npth_api" -gt 0 ; then

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

        if test "$tmp" -gt 0 ; then

           AC_MSG_CHECKING([NPTH API version])

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

             AC_MSG_RESULT([okay])

           else

             ok=no

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

           fi

        fi

     fi

  fi

  if test $ok = yes; then

    NPTH_CFLAGS=`$NPTH_CONFIG --cflags`

    NPTH_LIBS=`$NPTH_CONFIG --libs`

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

    npth_config_host=`$NPTH_CONFIG --host 2>/dev/null || echo none`

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

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

        AC_MSG_WARN([[

***

*** The config script $NPTH_CONFIG was

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

*** used host $host.

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

*** to specify a matching config script.

***]])

      fi

    fi

  else

    NPTH_CFLAGS=""

    NPTH_LIBS=""

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

  fi

  AC_SUBST(NPTH_CFLAGS)

  AC_SUBST(NPTH_LIBS)

])