Add an option to prune unwanted targets

test/prune_targets/gyptest-prune-targets.py

Index: test/prune_targets/gyptest-prune-targets.py
diff --git a/test/prune_targets/gyptest-prune-targets.py b/test/prune_targets/gyptest-prune-targets.py
new file mode 100644
index 0000000000000000000000000000000000000000..a062ab7593406a82800546f407b16bcb840ec6b3
--- /dev/null
+++ b/test/prune_targets/gyptest-prune-targets.py
@@ -0,0 +1,22 @@
+#!/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 --prune-targets removes the unnecessary targets.
+"""
+
+import TestGyp
+
+test = TestGyp.TestGyp()
+
+test.run_gyp('test1.gyp', '--prune-targets')
+
+test.build('test1.gyp', 'lib_wanted')
+test.build('test1.gyp', 'lib_wanted2')
+test.build('test1.gyp', 'lib_unwanted', status=1, stderr=None)
+test.build('test1.gyp', 'program')
+
+test.pass_test()