Add MB configs for ClangToTLinux* bots on FYI

tools/mb/mb.py

 #!/usr/bin/env python
 # Copyright 2015 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.
 
 """MB - the Meta-Build wrapper around GYP and GN
 
 MB is a wrapper script for GYP and GN that can be used to generate build files
 for sets of canned configurations and analyze them.
 """
@@ skipping 1061 matching lines @@
     cmd = [
         self.executable,
         self.PathJoin('build', 'gyp_chromium'),
         '-G',
         'output_dir=' + output_dir,
     ]
 
     # Ensure that we have an environment that only contains
     # the exact values of the GYP variables we need.
     env = os.environ.copy()
+
+    # This is a terrible hack to work around the fact that
+    # //tools/clang/scripts/update.py is invoked by GYP and GN but
+    # currently relies on an environment variable to figure out
+    # what revision to embed in the command line #defines.
+    # For GN, we've made this work via a gn arg that will cause update.py
+    # to get an additional command line arg, but getting that to work
+    # via GYP_DEFINES has proven difficult, so we rewrite the GYP_DEFINES
+    # to get rid of the arg and add the old var in, instead.
+    # See crbug.com/582737 for more on this. This can hopefully all
+    # go away with GYP.
+    if 'llvm_force_head_revision=1' in gyp_defines:
+      env['LLVM_FORCE_HEAD_REVISION'] = 1

[Dirk Pranke, 2016/04/25 22:12:16]

this should've been '1'.

+      gyp_defines = gyp_defines.replace('llvm_force_head_revision=1', '')
+
     env['GYP_GENERATORS'] = 'ninja'
     if 'GYP_CHROMIUM_NO_ACTION' in env:
       del env['GYP_CHROMIUM_NO_ACTION']
     if 'GYP_CROSSCOMPILE' in env:
       del env['GYP_CROSSCOMPILE']
     env['GYP_DEFINES'] = gyp_defines
     if vals['gyp_crosscompile']:
       env['GYP_CROSSCOMPILE'] = '1'
     return cmd, env
 
@@ skipping 325 matching lines @@
   # Then check to see if the arg contains any metacharacters other than
   # double quotes; if it does, quote everything (including the double
   # quotes) for safety.
   if any(a in UNSAFE_FOR_CMD for a in arg):
     arg = ''.join('^' + a if a in ALL_META_CHARS else a for a in arg)
   return arg
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))