Adds support for the library_dirs key, which appears in the documentation but was never actually im…

test/library_dirs/gyptest-library-dirs.py

+#!/usr/bin/env python
+
+# Copyright (c) 2013 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+Verifies library_dirs (in link_settings) are properly found.
+"""
+
+import TestGyp
+
+test = TestGyp.TestGyp(formats=['!android'])
+
+lib_dir = test.tempdir('secret_location')
+
+test.run_gyp('test.gyp',
+             '-D', 'abs_path_to_secret_library_location={0}'.format(lib_dir),
+             chdir='subdir')
+
+# Must build each target independently, since they are not in each others'
+# 'dependencies' (test.ALL does NOT work here for some builders, and in any case
+# would not ensure the correct ordering).
+test.build('test.gyp', 'mylib', chdir='subdir')
+test.build('test.gyp', 'libraries-search-path-test', chdir='subdir')
+
+expect = """Hello world
+"""
+test.run_built_executable(
+    'libraries-search-path-test', chdir='subdir', stdout=expect)
+
+test.pass_test()
+test.cleanup()