Let `gclient runhooks` pull clang on mac.

If nothing needs to be done, the script takes 0s to run. If a new
version is available, it's downloaded from the web. It's a 13MB
download, which takes ~20s. This has to be paid ~once/week by all
mac devs, but since clang compiles faster than gcc this is actually
a big speed-up.

BUG=none
TEST=none


Review URL: http://codereview.chromium.org/7835005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@99507 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 24 insertions, 0 deletions

diff --git a/DEPS b/DEPS
index 3f75812..f97868f 100644
--- a/DEPS
+++ b/DEPS
@@ -420,6 +420,13 @@ hooks = [
     ],
   },
   {
+    # Pull clang on mac. If nothing changed, or on non-mac platforms, this takes
+    # zero seconds to run. If something changed, it downloads a prebuilt clang,
+    # which takes ~20s, but clang speeds up builds by more than 20s.
+    "pattern": ".",
+    "action": ["python", "src/tools/clang/scripts/update.py", "--mac-only"],
+  },
+  {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
diff --git a/tools/clang/scripts/update.py b/tools/clang/scripts/update.py
new file mode 100644
index 0000000..6fe0653
--- /dev/null
+++ b/tools/clang/scripts/update.py
@@ -0,0 +1,17 @@
+#!/usr/bin/python
+# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Windows can't run .sh files, so this is a small python wrapper around
+# update.sh.
+
+import os
+import subprocess
+import sys
+
+if __name__ == '__main__':
+  if sys.platform in ['win32', 'cygwin']:
+    sys.exit(0)
+  subprocess.call(
+      [os.path.join(os.path.dirname(__file__), 'update.sh')] +  sys.argv[1:])