GYP: Make GYP build deterministic

test/determinism/gyptest-needed-variables.py

Index: test/determinism/gyptest-needed-variables.py
diff --git a/test/determinism/gyptest-needed-variables.py b/test/determinism/gyptest-needed-variables.py
new file mode 100644
index 0000000000000000000000000000000000000000..7b97cca0d2dff0d132ca6a027b4436b1f1600381
--- /dev/null
+++ b/test/determinism/gyptest-needed-variables.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2015 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 builds are the same even with different PYTHONHASHSEEDs.
+Tests needed_variables.
+"""
+
+import os
+import sys
+import TestGyp
+
+test = TestGyp.TestGyp()
+if test.format == 'ninja':
+  os.environ["PYTHONHASHSEED"] = "1"
+  test.run_gyp('needed-variables.gyp')
+  base = open(test.built_file_path('test.ninja', subdir='obj')).read()
+
+  for i in range(1,5):
+    os.environ["PYTHONHASHSEED"] = str(i)
+    test.run_gyp('needed-variables.gyp')
+    contents = open(test.built_file_path('test.ninja', subdir='obj')).read()
+    if base != contents:
+      test.fail_test()
+
+  del os.environ["PYTHONHASHSEED"]
+  test.pass_test()