Proposed fix for gruntjs#99

Using fs.unlink to remove symlink if exists.
Added test.

Gruntfile.js

@@ -10,6 +10,8 @@
 
 module.exports = function(grunt) {
 
+  var fs = require('fs');
+
   // Project configuration.
   grunt.initConfig({
     jshint: {
@@ -30,7 +32,8 @@ module.exports = function(grunt) {
         src: ['tmp/sample_long']
       },
       exclude: ['tmp/end_01/**/*', '!tmp/end_01/1.txt'],
-      excludeSub: ['tmp/end_02/**/*.*', '!tmp/end_02/2/**/*']
+      excludeSub: ['tmp/end_02/**/*.*', '!tmp/end_02/2/**/*'],
+      symlink: ['tmp/symlink']
     },
 
     // Unit tests.
@@ -52,6 +55,8 @@ module.exports = function(grunt) {
     grunt.file.copy('test/fixtures/sample_long/long.txt', 'tmp/sample_long/long.txt');
     grunt.file.copy('test/fixtures/sample_short/short.txt', 'tmp/sample_short/short.txt');
 
+    fs.symlinkSync('tmp/broken-symlink', 'tmp/symlink', 'dir');
+
     var cwd = 'test/fixtures/start';
     grunt.file.expand({
       cwd: cwd

tasks/clean.js

@@ -9,12 +9,17 @@
 'use strict';
 
 var async = require('async');
+var fs = require("fs");
 var rimraf = require('rimraf');
 
 module.exports = function(grunt) {
 
   function clean(filepath, options, done) {
+
     if (!grunt.file.exists(filepath)) {
+      try {
+        fs.unlinkSync(filepath);
+      } catch (err) {}
       return done();
     }
 

test/clean_test.js

@@ -29,5 +29,10 @@ exports.clean = {
     var res = dircompare.compareSync('test/expected/end_02', 'tmp/end_02');
     test.equal(true, res.same, 'should match exclusions for sub');
     test.done();
+  },
+  symlink: function (test) {
+    var res = grunt.file.exists('tmp/symlink');
+    test.equal(false, res, 'should delete broken symlink');
+    test.done();
   }
 };