#! /bin/sh

# Env:
# GSSAPI_CFLAGS
# GSSAPI_LIBS

have_gssapi=0

stdlib=`ocamlc -where`

rm -f config.h config.sh config.mk
ulimit -c 0          # no coredumps

compiler="ocamlc -custom"
if ocamlopt; then compiler=ocamlopt; fi

log="config.log"
rm -f $log
touch $log

out="config.h"
rm -f $out
touch $out

mkdir -p testdir

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

# Programs linked with ocamlc have more libraries linked in by default.
# Because of this, we use ocamlopt if available.

call_ocamlc () {
    echo '$' $compiler -ccopt "$GSSAPI_CFLAGS" -cclib "$GSSAPI_LIBS" "$@" >>$log
    ( cd testdir;
      $compiler -ccopt "$GSSAPI_CFLAGS" -cclib "$GSSAPI_LIBS" "$@"
    )  >>$log 2>&1
    return $?
}


check_fun() {
    macro="$1"
    fun="$2"

}

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


check_gssapi() {
    fun=gss_init_sec_context
    echo "# FUN $fun" >> $log

    cat <<EOF >testdir/main.ml
external test : unit -> unit = "do_test"
let () = test()
EOF

    cat <<EOF >testdir/test.c
#ifdef __APPLE__
#include <GSS/gssapi.h>
#else
#include <gssapi.h>
#endif

#include "caml/mlvalues.h"

value do_test (value dummy) {
  (void) & $fun;
  return 0;
}
EOF

    if call_ocamlc -o test test.c main.ml; then
        have_gssapi=1    
        variant="INCLUDE_GSSAPI"
    else
        have_gssapi=0
    fi
}


check_shishi() {
    fun=gss_init_sec_context
    echo "# FUN $fun" >> $log

    cat <<EOF >testdir/main.ml
let () = ()
EOF

    cat <<EOF >testdir/test.c
#include <gss.h>
int main (int argc, char *argv[], char *envp[]) {
  (void) & $fun;
  return 0;
}
EOF

    if call_ocamlc -o test test.c main.ml; then
        have_gssapi=1
        variant="INCLUDE_GSS"
    else
        have_gssapi=0
    fi
}


printf "Checking for GSSAPI/Kerberos... "

if [ -n "$GSSAPI_LIBS" -o -n "$GSSAPI_CFLAGS" ]; then
    check_gssapi
    if [ $have_gssapi -eq 0 ]; then
        check_shishi
    fi
else
    case `uname -s` in
        Darwin)
            GSSAPI_LIBS="-framework GSS"
            GSSAPI_CFLAGS=""
            check_gssapi
            ;;

        *)
            for lib in -lgssglue -lgssapi_krb5 -lgssapi; do
                GSSAPI_LIBS="$lib"
                check_gssapi
                if [ $have_gssapi -gt 0 ]; then break; fi
            done
            if [ $have_gssapi -eq 0 ]; then
                GSSAPI_LIBS="-lgss"
                check_shishi
            fi
    esac
fi


if [ $have_gssapi -gt 0 ]; then
    echo "found ($GSSAPI_LIBS)"
else
    echo "not found"
    exit 1
fi

if [ $have_gssapi -gt 0 ]; then
    # The vars in config.sh are picked up by reconfigure
    echo "GSSAPI_CFLAGS='$GSSAPI_CFLAGS'" >>config.sh
    echo "GSSAPI_LIBS='$GSSAPI_LIBS'" >>config.sh
    echo "GSSAPI_VARIANT=$variant" >>config.sh

    # The vars in config.mk are appended to Makefile.conf
    echo "# GSSAPI" >> config.mk
    echo "NETGSS_CFLAGS = $GSSAPI_CFLAGS" >>config.mk
    echo "NETGSS_LINK_OPTIONS = $GSSAPI_LIBS" >> config.mk
    echo "NETGSS_VARIANT = $variant" >>config.mk

    ./reconfigure
fi