From 12a6d6b43f9ac2a94a87d7e8fa2fbee0b068e25c Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Fri, 5 Apr 2013 22:09:38 +0200
Subject: [PATCH] Read provides from Closure Library

---
 build.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/build.py b/build.py
index 4813b7f54c..5335ba08f0 100755
--- a/build.py
+++ b/build.py
@@ -383,8 +383,16 @@ def _strip_comments(lines):
 @target('build/check-requires-timestamp', SRC, INTERNAL_SRC, EXTERNAL_SRC,
         EXAMPLES_SRC, SHADER_SRC, SPEC)
 def build_check_requires_timestamp(t):
+    from zipfile import ZipFile
     unused_count = 0
     all_provides = set()
+    zf = ZipFile(PLOVR_JAR)
+    for zi in zf.infolist():
+        if zi.filename.endswith('.js'):
+            for line in zf.open(zi):
+                m = re.match(r'goog.provide\(\'(.*)\'\);', line)
+                if m:
+                    all_provides.add(m.group(1))
     for filename in sorted(t.dependencies):
         if filename == 'build/src/internal/src/requireall.js':
             continue