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..c0e91e4a2d4ed5511a18056bb4c7692d24f151d0
--- /dev/null
+++ b/test/prune_targets/gyptest-prune-targets.py
@@ -0,0 +1,55 @@
+#!/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 --target removes the unnecessary targets.
+"""
+
+import TestGyp
+
+test = TestGyp.TestGyp()
+
+# By default, everything will be included.
+test.run_gyp('test1.gyp')
+test.build('test1.gyp', 'lib1')
+test.build('test1.gyp', 'lib2')
+test.build('test1.gyp', 'lib3')
+test.build('test1.gyp', 'lib_indirect')
+test.build('test1.gyp', 'program1')
+test.build('test1.gyp', 'program2')
+test.build('test1.gyp', 'program3')
+
+# With deep dependencies of program1 only.
+test.run_gyp('test1.gyp', '--target=program1')
+test.build('test1.gyp', 'lib1')
+test.build('test1.gyp', 'lib2', status=[1,2], stderr=None)
+test.build('test1.gyp', 'lib3', status=[1,2], stderr=None)
+test.build('test1.gyp', 'lib_indirect')
+test.build('test1.gyp', 'program1')
+test.build('test1.gyp', 'program2', status=[1,2], stderr=None)
+test.build('test1.gyp', 'program3', status=[1,2], stderr=None)
+
+# With deep dependencies of program2 only.
+test.run_gyp('test1.gyp', '--target=program2')
+test.build('test1.gyp', 'lib1', status=[1,2], stderr=None)
+test.build('test1.gyp', 'lib2')
+test.build('test1.gyp', 'lib3', status=[1,2], stderr=None)
+test.build('test1.gyp', 'lib_indirect')
+test.build('test1.gyp', 'program1', status=[1,2], stderr=None)
+test.build('test1.gyp', 'program2')
+test.build('test1.gyp', 'program3', status=[1,2], stderr=None)
+
+# With deep dependencies of program1 and program2.
+test.run_gyp('test1.gyp', '--target=program1', '--target=program2')
+test.build('test1.gyp', 'lib1')
+test.build('test1.gyp', 'lib2')
+test.build('test1.gyp', 'lib3', status=[1,2], stderr=None)
+test.build('test1.gyp', 'lib_indirect')
+test.build('test1.gyp', 'program1')
+test.build('test1.gyp', 'program2')
+test.build('test1.gyp', 'program3', status=[1,2], stderr=None)
+
+test.pass_test()