public ApiNativeDependencySet(NativeDependencySet delegate) {
            this.delegate = delegate;
        }

        @Override
        public FileCollection getIncludeRoots() {
            return delegate.getIncludeRoots();
        }

        @Override
        public FileCollection getLinkFiles() {
            return FileCollectionFactory.empty(delegate.getLinkFiles().toString());
        }

        private static final NativeDependencySet INSTANCE = new EmptyNativeDependencySet();

        @Override
        public FileCollection getIncludeRoots() {
            return FileCollectionFactory.empty();
        }

        @Override
        public FileCollection getLinkFiles() {
            return FileCollectionFactory.empty();
        }

    private final NativeLibraryBinary binary;

    public DefaultNativeDependencySet(NativeLibraryBinary binary) {
        this.binary = binary;
    }

    @Override
    public FileCollection getIncludeRoots() {
        return binary.getHeaderDirs();
    }

    @Override
    public FileCollection getLinkFiles() {
        return binary.getLinkFiles();
    }

    @Override

/**
 * Models a collection of native type dependencies.
 */
@Incubating
public interface NativeDependencySet {
    /**
     * Returns the header file directories to use at compile time.
     */
    FileCollection getIncludeRoots();

    /**
     * Returns the files to use at link time.
     */
    FileCollection getLinkFiles();

    /**
     * Returns the files to use at runtime.
     */
    FileCollection getRuntimeFiles();

        when:
        NativeCompileSpec compileSpec = Stub(getCompileSpecType()) {
            getMacros() >> [foo: "bar", empty: null]
            getAllArgs() >> ["-firstArg", "-secondArg"]
            getIncludeRoots() >> [includeDir]
            getSystemIncludeRoots() >> [systemIncludeDir]
            getOperationLogger() >> Mock(BuildOperationLogger)
            getPrefixHeaderFile() >> null

        }
        if (spec.isOptimized()) {
            args.add("/O2");
        }
    }

    protected void addIncludeArgs(T spec, List<String> args) {
        for (File file : spec.getIncludeRoots()) {
            args.add("/I" + file.getAbsolutePath());
        }
        for (File file : spec.getSystemIncludeRoots()) {
            args.add("/I" + file.getAbsolutePath());
        }
    }

 */
public interface NativeCompileSpec extends BinaryToolSpec {
    File getObjectFileDir();

    void setObjectFileDir(File objectFileDir);

    List<File> getIncludeRoots();

    void include(Iterable<File> includeRoots);

    void include(File... includeRoots);

    List<File> getSystemIncludeRoots();

    void systemInclude(Iterable<File> systemIncludeRoots);

    }

    protected void addIncludeArgs(T spec, List<String> args) {
        if (!needsStandardIncludes(spec.getTargetPlatform())) {
            args.add("-nostdinc");
        }

        for (File file : spec.getIncludeRoots()) {
            args.add("-I");
            args.add(file.getAbsolutePath());
        }

        for (File file : spec.getSystemIncludeRoots()) {
            args.add("-isystem");

            public List<FileCollection> call() {
                Collection<NativeDependencySet> libs = binary.getLibs((DependentSourceSet) sourceSet);
                return CollectionUtils.collect(libs, NativeDependencySet::getIncludeRoots);
            }
        });
        FileCollectionFactory fileCollectionFactory = ((ProjectInternal) task.getProject()).getServices().get(FileCollectionFactory.class);

    private File preCompiledHeaderObjectFile;
    private List<File> sourceFilesForPch = new ArrayList<File>();
    private String preCompiledHeader;

    @Override
    public List<File> getIncludeRoots() {
        return includeRoots;
    }

    @Override
    public void include(File... includeRoots) {
        Collections.addAll(this.includeRoots, includeRoots);
    }

    @Override