diff -r 000000000000 -r 6474c204b198 build/compare-mozconfig/compare-mozconfigs-wrapper.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/compare-mozconfig/compare-mozconfigs-wrapper.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,63 @@
+#!/usr/bin/python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import unicode_literals
+
+import subprocess
+import sys
+from os import path
+from buildconfig import substs
+
+import logging
+log = logging.getLogger(__name__)
+
+def determine_platform():
+    platform_mapping = {'WINNT': {'x86_64': 'win64',
+                                  'i686': 'win32'},
+                        'Darwin': {'x86_64': 'macosx-universal',
+                                   'i386':'macosx-universal'},
+                        'Linux': {'x86_64': 'linux64',
+                                  'i686': 'linux32'}}
+
+    os_type = substs['OS_TARGET']
+    cpu_type = substs['TARGET_CPU']
+    return platform_mapping.get(os_type, {}).get(cpu_type, None)
+
+def main():
+    """ A wrapper script that calls compare-mozconfig.py
+    based on the platform that the machine is building for"""
+    platform = determine_platform()
+
+    if platform is not None:
+        python_exe = substs['PYTHON']
+        topsrcdir = substs['top_srcdir']
+
+        # construct paths and args for compare-mozconfig
+        browser_dir = path.join(topsrcdir, 'browser')
+        script_path = path.join(topsrcdir, 'build/compare-mozconfig/compare-mozconfigs.py')
+        whitelist_path = path.join(browser_dir, 'config/mozconfigs/whitelist')
+        beta_mozconfig_path = path.join(browser_dir, 'config/mozconfigs', platform, 'beta')
+        release_mozconfig_path = path.join(browser_dir, 'config/mozconfigs', platform, 'release')
+        nightly_mozconfig_path = path.join(browser_dir, 'config/mozconfigs', platform, 'nightly')
+
+        log.info("Comparing beta against nightly mozconfigs")
+        ret_code = subprocess.call([python_exe, script_path, '--whitelist',
+                                    whitelist_path, '--no-download',
+                                    platform + ',' + beta_mozconfig_path +
+                                    ',' + nightly_mozconfig_path])
+
+        if ret_code > 0:
+            return ret_code
+
+        log.info("Comparing release against nightly mozconfigs")
+        ret_code = subprocess.call([python_exe, script_path, '--whitelist',
+                                    whitelist_path, '--no-download',
+                                    platform + ',' + release_mozconfig_path +
+                                    ',' + nightly_mozconfig_path])
+
+        return ret_code
+
+if __name__ == '__main__':
+    sys.exit(main())