# -*- autoconf -*-

#########################################

##

#   Perl & Python support

##

#########################################

##

#   Check whether Net-SNMP configuration will support Perl

##

#   Inputs:

#       install_perl:   whether or not to install the Perl modules

#                           yes/no/try   (i.e. 'maybe' - the default)

#       embed_perl:     whether or not to embed Perl support within the agent

#                           yes/no/try   (i.e. 'maybe' - the default)

#

#       ac_cv_path_PERLPROG:    Path to perl binary

#       Embedded Perl requires Perl modules, and the perl binary

#

if test "x$embed_perl" = "xtry" ; then

    if test "x$install_perl" = "xno" ; then

        install_perl="try"

    fi

    if test "x$ac_cv_path_PERLPROG" = "x" -o "x$ac_cv_path_PERLPROG" = "xno" ; then

        install_perl="no"

        embed_perl="no"

    fi

fi

#       Perl modules require the perl binary

#

if test "x$install_perl" != "xno" ; then

    myperl=$ac_cv_path_PERLPROG

    if test $myperl = "no" ; then

        if test "x$install_perl" = "xtry" ; then

            install_perl="no"

        else

            AC_MSG_ERROR(--enable-embedded-perl requested but no perl executable found)

        fi

    fi

fi

#       Perl modules require shared libraries

#

if test "x$install_perl" != "xno" ; then

    if test "x$enable_shared" != "xyes"; then

        if test "x$install_perl" = "xtry" ; then

            install_perl="no"

        else

            AC_MSG_ERROR(Perl support requires --enable-shared)

        fi

    fi

fi

#       Perl modules can only be installed from within the source tree

#

if test "x$install_perl" != "xno" ; then

    AC_MSG_CHECKING([if we are in the source tree so we can install Perl modules])

    if test "x$srcdir" = "x." -o -d perl/agent/default_store ; then

        AC_MSG_RESULT([Yes])

    else

        if test "x$install_perl" = "xtry" ; then

            install_perl="no"

            AC_MSG_RESULT([No])

        else

            AC_MSG_ERROR([Perl modules can not be built outside the source directory])

        fi

    fi

fi      

#   The rest of the Perl-related checks aren't relevant

#       if we're not using the Perl modules

#

if test "x$install_perl" != "xno" ; then

##

#   Check compiler compatability

##

    #       What compiler was used to build the perl binary?

    #

    if test "x$enable_perl_cc_checks" != "xno" ; then

        AC_MSG_CHECKING([for Perl cc])

        changequote(, )

        PERLCC=`$myperl -V:cc | $myperl -n -e 'print if (s/^\s*cc=.([-=\w\s\/]+).;\s*/$1/);'`

        changequote([, ])

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

            AC_MSG_RESULT([$PERLCC])

        else

            if test "x$install_perl" = "xtry" ; then

                install_perl="no"

            else

                AC_MSG_ERROR([Could not determine the compiler that was used to build $myperl. Either set the environment variable PERLPROG to a different perl binary or use --without-perl-modules to build without Perl.])

            fi

        fi

    fi

    #       Was GCC used to build the perl binary?

    #

    if test "x$install_perl" != "xno" ; then

        AC_MSG_CHECKING([whether $PERLCC is a GNU C compiler])

        OLDCC=$CC

        CC="$PERLCC"

        AC_COMPILE_IFELSE([

            AC_LANG_PROGRAM([], [[

#ifndef __GNUC__

  choke me

#endif

            ]])], [perlcc_is_gnu=yes], [perlcc_is_gnu=no])

        AC_MSG_RESULT([$perlcc_is_gnu])

        CC=$OLDCC

        #       Check compatability:  Gnu Net-SNMP vs Non-Gnu perl

        #

        if test "x$GCC" = "xyes" -a "x$perlcc_is_gnu" = "xno" ; then

            if test "x$install_perl" = "xtry" ; then

      	        install_perl="no"

      	    else

      	        AC_MSG_ERROR([This build is using a GNU C compiler ($CC) while Perl has been compiled with a non-GNU (or non-working) compiler ($PERLCC). This likely won't work for building with Perl support. Either specify a different compiler (--with-cc=PATH), disable this check (--disable-perl-cc-checks) or build without Perl (--without-perl-modules).])

      	    fi

        fi

    fi

    #       Check compatability:  Non-Gnu Net-SNMP vs Gnu perl

    #

    if test "x$install_perl" != "xno" ; then

        if test "x$GCC" != "xyes" -a "x$perlcc_is_gnu" = "xyes" ; then

      	    if test "x$install_perl" = "xtry" ; then

      	        install_perl="no"

      	    else

                AC_MSG_ERROR([This build is using a non-GNU C compiler ($CC) while Perl has been compiled with a GNU compiler ($PERLCC). This likely won't work for building with Perl support. Either specify a different compiler (--with-cc=PATH), disable this check (--disable-perl-cc-checks) or build without Perl (--without-perl-modules).])

      	    fi

        fi

    fi

    #       Are we clear to proceed?

    #

    if test "x$install_perl" = "xtry" ; then

        install_perl="yes"

    else

        if test "x$install_perl" = "xno" ; then

            install_perl="no"

            embed_perl="no"

        fi

    fi

##

#   Determine compilation environment needed for embedded Perl

##

#       System-specific requirements

#

case $target_os in

    solaris*)

      if test "x$embed_perl" != "xno" ; then

          #   Check for LARGEFILE support               (Solaris)

          #

          AC_MSG_CHECKING([for problematic Perl cc flags on Suns])

          if $myperl -V:ccflags | $GREP LARGEFILE > /dev/null ; then

            if test "x$embed_perl" = "xtry" ; then

              embed_perl="no"

            else

              AC_MSG_ERROR([Perl was compiled with LARGEFILE support which will break Net-SNMP. Either set the environment variable PERLPROG to a different perl binary or use --disable-embedded-perl to turn off embedded Perl functionality altogether.])

            fi

          else

            AC_MSG_RESULT([none known])

          fi

      fi

    ;;

    # Embedded perl typically fails on HP-UX and Mac OS X

    # We really need to investigate why, and check for this explicitly

    # But for the time being, turn this off by default

    hpux*|darwin8*|darwin9*|darwin10*)

        if test "x$embed_perl" = "xtry" ; then

            AC_MSG_WARN([Embedded perl defaulting to off])

            embed_perl="no"

        fi

    ;;

    *)

    ;;

esac

#       Compiler flags

#

if test "x$embed_perl" != "xno" ; then

    AC_MSG_CHECKING([for Perl CFLAGS])

    perlcflags=`$myperl -MExtUtils::Embed -e ccopts`

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

      AC_MSG_RESULT([$perlcflags])

      CFLAGS="$CFLAGS $perlcflags"

    else

      if test "x$embed_perl" = "xtry" ; then

        embed_perl="no"

      else

        AC_MSG_ERROR([Could not determine the C compiler flags that were used to build $myperl. Either set the environment variable PERLPROG to a different Perl binary or use --disable-embedded-perl to turn off embedded Perl functionality altogether.])

      fi

    fi

fi

#       Linker flags

#

if test "x$embed_perl" != "xno" ; then

    AC_MSG_CHECKING([for Perl LDFLAGS])

    netsnmp_perlldopts=`$myperl -MExtUtils::Embed -e ldopts`

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

      AC_MSG_RESULT([$netsnmp_perlldopts])

    else

      if test "x$embed_perl" = "xtry" ; then

        embed_perl="no"

      else

        AC_MSG_ERROR([Could not determine the linker options that were used to build $myperl. Either set the environment variable PERLPROG to a different Perl binary or use --disable-embedded-perl to turn off embedded Perl functionality altogether.])

      fi

    fi

    if test "x$enable_as_needed" != "xno" ; then

      #   Just-in-time linking will embed the Perl library within

      #       the Net-SNMP library (rather than the agent application)

      #

      PERLLDOPTS_FOR_LIBS="$netsnmp_perlldopts"

      #   Perl ccdlflags (RPATH to libperl, hopefully)

      #

      AC_MSG_CHECKING([for Perl CCDLFLAGS])

      changequote(, )

      netsnmp_perlccdlflags=`$myperl -V:ccdlflags | $myperl -n -e 'print $1 '"if (/^\s*ccdlflags='([^']+)';/);"`

      changequote([, ])

      AC_MSG_RESULT([$netsnmp_perlccdlflags])

      PERLLDOPTS_FOR_APPS="$netsnmp_perlccdlflags"

    else

      #   Otherwise embed the Perl library within the application

      #

      PERLLDOPTS_FOR_LIBS="$netsnmp_perlldopts"

      # link *applications* against libperl

      PERLLDOPTS_FOR_APPS="$netsnmp_perlldopts"

    fi

fi

#       'Perl_eval_pv' function (and equivalents)

#

if test "x$embed_perl" != "xno" ; then

    #   Three possible versions of this routine:

    #       eval_pv                                     (to 5.003_97d)

    #       perl_eval_pv                                (5.004/5.005)

    #       Perl_eval_pv                                (from 5.6ff)

    #

    OLDLIBS="$LIBS"

    LIBS="$LIBS $netsnmp_perlldopts"

    AC_CHECK_FUNCS(eval_pv)

    AC_CHECK_FUNC(perl_eval_pv,

      AC_DEFINE(HAVE_PERL_EVAL_PV_LC, 1,

        [Define to 1 if you have `the perl_eval_pv' function.]))

    AC_CHECK_FUNC(Perl_eval_pv,

      AC_DEFINE(HAVE_PERL_EVAL_PV_UC, 1,

        [Define to 1 if you have the `Perl_eval_pv' function.]))

    LIBS="$OLDLIBS"

    #

    #   Note that autoconf flattens case when defining tokens,

    #   so we need to explicitly distinguish between the latter two.

    if test "x$ac_cv_func_perl_eval_pv" != "xyes" -a "x$ac_cv_func_Perl_eval_pv" != "xyes" -a "x$ac_cv_func_eval_pv" != "xyes" ; then

      if test "x$embed_perl" = "xtry" ; then

        embed_perl="no"

      else

        AC_MSG_ERROR([Could not find the eval_pv, perl_eval_pv or Perl_eval_pv functions needed for embedded Perl support. Either set the environment variable PERLPROG to a different perl binary or use --disable-embedded-perl to turn off embedded Perl functionality altogether.])

      fi

    else

      #   Activate Embedded Perl

      #

      AC_DEFINE(NETSNMP_EMBEDDED_PERL, 1,

        [Define if you are embedding perl in the main agent.])

      OTHERAGENTLIBOBJS="snmp_perl.o"

      OTHERAGENTLIBLOBJS="snmp_perl.lo"

      OTHERAGENTLIBLFTS="snmp_perl.ft"

      EMBEDPERLINSTALL="embedperlinstall"

      EMBEDPERLUNINSTALL="embedperluninstall"

      embed_perl="yes"

    fi

else

      EMBEDPERLINSTALL=""

      EMBEDPERLUNINSTALL=""

      embed_perl="no"

    fi

fi

##

#   Report and configure results

##

AC_SUBST(EMBEDPERLINSTALL)

AC_SUBST(EMBEDPERLUNINSTALL)

AC_SUBST(PERLLDOPTS_FOR_LIBS)

AC_SUBST(PERLLDOPTS_FOR_APPS)

#       Results of Embedded Perl checks

#

AC_MSG_CHECKING([for potential embedded Perl support])

if test "x$embed_perl" != "xyes" ; then

  AC_MSG_CACHE_ADD(Embedded Perl support:      disabled)

  AC_MSG_RESULT([disabled])

else

  AC_MSG_CACHE_ADD(Embedded Perl support:      enabled)

  AC_MSG_RESULT([enabled])

fi

#       Results of Perl Module checks

#

PERLTARGS=""

PERLINSTALLTARGS=""

PERLUNINSTALLTARGS=""

PERLFEATURES=""

AC_MSG_CHECKING([if we can install the Perl modules])

if test "x$install_perl" = "xyes" ; then

    PERLTARGS="perlmodules"

    PERLINSTALLTARGS="perlinstall"

    PERLUNINSTALLTARGS="perluninstall"

    PERLFEATURES="perlfeatures"

    if test "x$embed_perl" = "xyes" ; then

      AC_MSG_CACHE_ADD(SNMP Perl modules:          building -- embeddable)

      AC_MSG_RESULT([yes -- and embeddable])

    else

      AC_MSG_CACHE_ADD(SNMP Perl modules:          building -- not embeddable)

      AC_MSG_RESULT([yes -- not embeddable])

    fi

else

    AC_MSG_RESULT([no])

    AC_MSG_CACHE_ADD(SNMP Perl modules:          disabled)

fi

AC_SUBST(PERLTARGS)

AC_SUBST(PERLINSTALLTARGS)

AC_SUBST(PERLUNINSTALLTARGS)

AC_SUBST(PERLARGS)

AC_SUBST(PERLFEATURES)

#       Reset LIBS to pre-libwrap value   (???)

#

AGENTLIBS=$LIBS

LIBS=$NONAGENTLIBS

##

#   Python checks

##

PYTHONTARGS=""

PYTHONINSTALLTARGS=""

PYTHONUNINSTALLTARGS=""

PYTHONCLEANTARGS=""

PYTHONFEATURES=""

AC_MSG_CHECKING([if we should install the python bindings])

if test "x$install_python" = "xyes" ; then

    PYTHONTARGS="pythonmodules"

    PYTHONINSTALLTARGS="pythoninstall"

    PYTHONUNINSTALLTARGS="pythonuninstall"

    PYTHONCLEANTARGS="pythonclean"

    PYTHONFEATURES="pythonfeatures"

    AC_MSG_CACHE_ADD(SNMP Python modules:        building for $PYTHONPROG)

    AC_MSG_RESULT([yes])

else

    AC_MSG_CACHE_ADD(SNMP Python modules:        disabled)

    AC_MSG_RESULT([no])

fi

AC_SUBST(PYTHONTARGS)

AC_SUBST(PYTHONINSTALLTARGS)

AC_SUBST(PYTHONUNINSTALLTARGS)

AC_SUBST(PYTHONCLEANTARGS)

AC_SUBST(PYTHONARGS)

AC_SUBST(PYTHONFEATURES)