Revert "Stop checking for duplicate basenames"

test/errors/gyptest-errors.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 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.
 
 """
 Test that two targets with the same name generates an error.
 """
 
@@ skipping 29 matching lines @@
              match=TestCmd.match_re_dotall)
 
 stderr = (".*target0.*target1.*target2.*target0.*")
 test.run_gyp('dependency_cycle.gyp', status=1, stderr=stderr,
              match=TestCmd.match_re_dotall)
 
 stderr = (".*file_cycle0.*file_cycle1.*file_cycle0.*")
 test.run_gyp('file_cycle0.gyp', status=1, stderr=stderr,
              match=TestCmd.match_re_dotall)
 
+stderr = 'gyp: Duplicate basenames in sources section, see list above\n'
+test.run_gyp('duplicate_basenames.gyp', status=1, stderr=stderr)
+
+# Check if '--no-duplicate-basename-check' works.
+if ((test.format == 'make' and sys.platform == 'darwin') or
+    (test.format == 'msvs' and
+        int(os.environ.get('GYP_MSVS_VERSION', 2010)) < 2010)):
+  stderr = 'gyp: Duplicate basenames in sources section, see list above\n'
+  test.run_gyp('duplicate_basenames.gyp', '--no-duplicate-basename-check',
+               status=1, stderr=stderr)
+else:
+  test.run_gyp('duplicate_basenames.gyp', '--no-duplicate-basename-check')
+
 stderr = ("gyp: Dependency '.*missing_dep.gyp:missing.gyp#target' not found "
           "while trying to load target .*missing_dep.gyp:foo#target\n")
 test.run_gyp('missing_dep.gyp', status=1, stderr=stderr,
              match=TestCmd.match_re)
 
 test.pass_test()