Add a clang/mac bot to the FYI waterfall.

buildbot/scripts/slave/compile.py

Index: buildbot/scripts/slave/compile.py
===================================================================
--- buildbot/scripts/slave/compile.py	(revision 60688)
+++ buildbot/scripts/slave/compile.py	(working copy)
@@ -37,13 +37,20 @@
 def main_xcode(options, args):
   """Interprets options, clobbers object files, and calls xcodebuild.
   """
+  compiler = options.compiler
+  assert compiler in (None, 'clang')
+
   # Note: this clobbers all targets, not just Debug or Release.
+  build_output_dir = os.path.join(os.path.dirname(options.build_dir),
+      'xcodebuild')
+  if compiler == 'clang':
+    build_output_dir = os.path.join(os.path.dirname(options.build_dir),
+        'clang')
+
   if options.clobber:
-    build_output_dir = os.path.join(os.path.dirname(options.build_dir),
-                                    'xcodebuild')
     chromium_utils.RemoveDirectory(build_output_dir)
 
-  # If the project isn't in args, add all.xcodeproj so simplify configuration.
+  # If the project isn't in args, add all.xcodeproj to simplify configuration.
   command = ['xcodebuild', '-configuration', options.target]
 
   # TODO(mmoss) Support the old 'args' usage until we're confident the master is
@@ -96,6 +103,15 @@
           env['DISTCC_HOSTS'] = 'dummy,cpp,lzo'
           command.insert(0, "pump")
 
+  if compiler == 'clang':
+    env['CC'] = 'clang++'
+    env['DSTROOT'] = os.path.abspath(build_output_dir)
+    env['OBJROOT'] = os.path.join(env['DSTROOT'], 'obj')
+    env['SYMROOT'] = os.path.join(env['DSTROOT'], 'sym')
+
+  if options.xcode_target:
+    command.extend(['-target', options.xcode_target])
+
   # Add on any remaining args
   command.extend(args)
 
@@ -465,6 +481,10 @@
     # For linux to arm cross compile.
     option_parser.add_option('', '--crosstool', default=None,
                              help='optional path to crosstool toolset')
+  if chromium_utils.IsMac():
+    # Mac only.
+    option_parser.add_option('', '--xcode-target', default=None,
+                             help='Target from the xcodeproj file')
 
   options, args = option_parser.parse_args()