return compiler.execute(spec);
    }

    private boolean deleteOutputsForRemovedSources(SwiftCompileSpec spec) {
        boolean didRemove = false;
        for (File removedSource : spec.getRemovedSourceFiles()) {
            File objectFile = getObjectFile(spec.getObjectFileDir(), removedSource);

            try {
                if (deleter.deleteRecursively(objectFile.getParentFile())) {

    void systemInclude(Iterable<File> systemIncludeRoots);

    List<File> getSourceFiles();

    void setSourceFiles(Collection<File> sources);

    void source(Iterable<File> sources);

    List<File> getRemovedSourceFiles();

    void setRemovedSourceFiles(Collection<File> sources);

    void removedSource(Iterable<File> sources);

    Map<String, String> getMacros();

    void setMacros(Map<String, String> macros);

        return compiler.execute(spec).getDidWork();
    }

    private boolean deleteOutputsForRemovedSources(NativeCompileSpec spec) {
        boolean didRemove = false;
        for (File removedSource : spec.getRemovedSourceFiles()) {
            File objectFile = getObjectFile(spec.getObjectFileDir(), removedSource);

            // Remove .pdb file if present

        List<TestFile> toCompile = Arrays.asList(sourceToCompile)
        List<TestFile> toRemove = sourceFiles - toCompile
        2 * spec.getSourceFiles() >> toCompile
        1 * spec.getRemovedSourceFiles() >> toRemove
        cleanCompiler.execute(spec)
    }

    def createObjDummy(File sourceFile) {
        def objectFile = new TestFile(namingScheme.withObjectFileNameSuffix(O_EXT).

    }

    @Override
    public void setSourceFiles(Collection<File> sources) {
        sourceFiles.clear();
        sourceFiles.addAll(sources);
    }

    @Override
    public List<File> getRemovedSourceFiles() {
        return removedSourceFiles;
    }

    @Override
    public void removedSource(Iterable<File> sources) {
        addAll(removedSourceFiles, sources);
    }

    @Override