Support rebuilding tests in dotc, be smart about sbt incremental comp…

…ilation.

bin/dotc

@@ -58,19 +58,20 @@ function checkjar {
       echo "The required jar file was built successfully."
     fi
   else
-    NEW_FILES="$(find "$DOTTY_ROOT/src" -iname "*.scala" -newer "$1")"
+    NEW_FILES="$(find "$DOTTY_ROOT/$3" -iname "*.scala" -newer "$1")"
     if [ ! -z "$NEW_FILES" ]; 
     then
       echo "new files detected. rebuilding"
       cd $DOTTY_ROOT
       sbt $2
+      touch "$1"
       cd -
     fi
   fi
 }
 
-checkjar $MAIN_JAR package
-checkjar $TEST_JAR test:package
+checkjar $MAIN_JAR package src
+checkjar $TEST_JAR test:package test
 
 # Autodetecting the scala-library location, in case it wasn't provided by an environment variable
 if [ "$SCALA_LIBRARY_JAR" == "" ]