protected CompilationUnit makeCompileUnit(GroovyClassLoader loader) {
    Map<String, Object> options = configuration.getJointCompilationOptions();
    if (options != null) {
        if (keepStubs) {
            options.put("keepStubs", Boolean.TRUE);
        }
        if (stubDir != null) {
            options.put("stubDir", stubDir);
        } else {
            try {
                File tempStubDir = DefaultGroovyStaticMethods.createTempDir(null, "groovy-generated-", "-java-source");
                temporaryFiles.add(tempStubDir);
                options.put("stubDir", tempStubDir);
            } catch (IOException ioe) {
                throw new BuildException(ioe);
            }
        }
        return new JavaAwareCompilationUnit(configuration, loader);
    } else {
        return new CompilationUnit(configuration, null, loader);
    }
}