Make interop tool generate one self-contained .kt.bc

cmd/interop

@@ -10,6 +10,8 @@ fi
 declare -a java_args
 declare -a interop_args
 
+OUTPUT_FILE_NAME=nativelib.kt.bc
+
 while [ $# -gt 0 ]; do
   case "$1" in
     -D*)
@@ -20,6 +22,10 @@ while [ $# -gt 0 ]; do
       java_args=("${java_args[@]}" "${1:2}")
       shift
       ;;
+    -o:*)
+      OUTPUT_FILE_NAME="${1:3}"
+      shift
+      ;;
      *)
       interop_args=("${interop_args[@]}" "$1")
       shift
@@ -54,11 +60,24 @@ INTEROP_TOOL=org.jetbrains.kotlin.native.interop.gen.jvm.MainKt
 
 FLAVOR_ARG=-flavor:native
 
+GENERATED_DIR="$OUTPUT_FILE_NAME-build/kotlin"
+GENERATED_ARG="-generated:$GENERATED_DIR"
+NATIVES_DIR="$OUTPUT_FILE_NAME-build/natives"
+NATIVES_ARG="-natives:$NATIVES_DIR"
+CSTUBSNAME=cstubs
+CSTUBSNAME_ARG="-cstubsname:$CSTUBSNAME"
+
 LIBCLANG_DISABLE_CRASH_RECOVERY=1 \
 LD_LIBRARY_PATH=${NATIVE_LIB} \
 $JAVACMD $JAVA_OPTS ${java_args[@]} \
     -cp $INTEROP_CLASSPATH \
     $INTEROP_TOOL \
+    "$GENERATED_ARG" "$NATIVES_ARG" "$CSTUBSNAME_ARG" \
     $FLAVOR_ARG "${interop_args[@]}" \
+    || exit 1
 
+# Stubs may be rather big, so we may need more heap space.
+XMX_ARG=-J-Xmx3G
 
+$KONAN_HOME/bin/konanc $XMX_ARG "$GENERATED_DIR" -nolink -nativelibrary "$NATIVES_DIR/$CSTUBSNAME.bc" \
+    -o "$OUTPUT_FILE_NAME"