Allow depfile to depend on a Stamp file instead of the default first input.

grit/tool/build_unittest.py

Index: grit/tool/build_unittest.py
diff --git a/grit/tool/build_unittest.py b/grit/tool/build_unittest.py
index d35778334218e3723e9f43c19afc43f1ad5c7249..ac2be107a32abe9a42720f847296034802b15cda 100644
--- a/grit/tool/build_unittest.py
+++ b/grit/tool/build_unittest.py
@@ -301,6 +301,31 @@ class BuildUnittest(unittest.TestCase):
     self.assertTrue(abs(second_mtime - UNCHANGED) > 5)
     self.assertTrue(abs(third_mtime - UNCHANGED) < 5)
 
+  def testGenerateDepFileWithDependOnStamp(self):
+    output_dir = tempfile.mkdtemp()
+    builder = build.RcBuilder()
+    class DummyOpts(object):
+      def __init__(self):
+        self.input = util.PathFromRoot('grit/testdata/substitute.grd')
+        self.verbose = False
+        self.extra_verbose = False
+    expected_dep_file = os.path.join(output_dir, 'substitute.grd.stamp.d')
+    builder.Run(DummyOpts(), ['-o', output_dir,
+                              '--depdir', output_dir,
+                              '--depfile', expected_dep_file,
+                              '--depend-on-stamp'])
+
+    self.failUnless(os.path.isfile(expected_dep_file))
+    with open(expected_dep_file) as f:
+      line = f.readline()
+      (dep_output_file, deps_string) = line.split(': ')
+      deps = deps_string.split(' ')
+
+      self.failUnlessEqual("substitute.grd.stamp.d", dep_output_file)
+      self.failUnlessEqual(1, len(deps))
+      self.failUnlessEqual(deps[0],
+          util.PathFromRoot('grit/testdata/substitute.xmb'))
+
 
 if __name__ == '__main__':
   unittest.main()