#! /bin/sh

# Env:
# GNUTLS_CFLAGS
# GNUTLS_LIBS
# PKG_CONFIG
# GNUTLS_SYSTEM_TRUST_FILE

have_gnutls=0

if [ -z "$PKG_CONFIG" ]; then
    PKG_CONFIG="pkg-config"
fi

if [ -z "$GNUTLS_LIBS" ]; then
   GNUTLS_CFLAGS1=`$PKG_CONFIG --cflags gnutls`
   GNUTLS_CFLAGS2=`$PKG_CONFIG --cflags nettle`
   GNUTLS_LIBS1=`$PKG_CONFIG --libs gnutls`
   GNUTLS_LIBS2=`$PKG_CONFIG --libs nettle`
   if [ -z "$GNUTLS_LIBS2" ]; then GNUTLS_LIBS2="-lnettle"; fi
   GNUTLS_CFLAGS="$GNUTLS_CFLAGS1 $GNUTLS_CFLAGS2"
   GNUTLS_LIBS="$GNUTLS_LIBS1 $GNUTLS_LIBS2"
fi


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 '$' $compiler -ccopt "$GNUTLS_CFLAGS" -cclib "$GNUTLS_LIBS" "$@" >>$log
    ( cd testdir;
      $compiler -ccopt "$GNUTLS_CFLAGS" -cclib "$GNUTLS_LIBS" "$@"
    )  >>$log 2>&1
    return $?
}


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

}

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


printf "Checking for GnuTLS... "
fun=gnutls_global_init
echo "# FUN $fun" >> $log

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

cat <<EOF >testdir/test.c
#include <gnutls/gnutls.h>
#include <gnutls/openpgp.h>
#include <gnutls/x509.h>
#include "caml/mlvalues.h"
value do_test(value dummy) {
  (void) & $fun;
  return 0;
}
EOF

if call_ocamlc -o test test.c main.ml; then
    echo "found"
    have_gnutls=1    
else
    echo "not found"
    have_gnutls=0
    exit 1
fi


if [ $have_gnutls -gt 0 ]; then
    # The vars in config.sh are picked up by reconfigure
    echo "PKG_CONFIG='$PKG_CONFIG'" >>config.sh
    echo "GNUTLS_CFLAGS='$GNUTLS_CFLAGS'" >>config.sh
    echo "GNUTLS_LIBS='$GNUTLS_LIBS'" >>config.sh
    echo "GNUTLS_SYSTEM_TRUST_FILE='$GNUTLS_SYSTEM_TRUST_FILE'" >>config.sh

    # The vars in config.mk are appended to Makefile.conf
    echo "# GnuTLS" >>config.mk
    echo "NETTLS_GNUTLS_CFLAGS = $GNUTLS_CFLAGS" >>config.mk
    echo "NETTLS_GNUTLS_LINK_OPTIONS = $GNUTLS_LIBS" >>config.mk

    ./reconfigure
fi