upload clang pdbs to chrome's symbol server

tools/clang/scripts/update.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """This script is used to download prebuilt clang binaries.
 
 It is also used by package.py to build the prebuilt clang binaries."""
 
 import argparse
@@ skipping 601 matching lines @@
     RmTree(LIBCXX_DIR)
 
   # Build clang.
 
   # If building at head, define a macro that plugins can use for #ifdefing
   # out code that builds at head, but not at CLANG_REVISION or vice versa.
   if use_head_revision:
     cflags += ['-DLLVM_FORCE_HEAD_REVISION']
     cxxflags += ['-DLLVM_FORCE_HEAD_REVISION']
 
+  # Build PDBs for archival on Windows.  Don't use RelWithDebInfo since it
+  # has different optimization defaults than Release.
+  if sys.platform == 'win32' and args.bootstrap:
+    cflags += ['/Zi']
+    cxxflags += ['/Zi']
+    ldflags += ['/DEBUG', '/OPT:REF', '/OPT:ICF']
+
   CreateChromeToolsShim()
 
   deployment_env = None
   if deployment_target:
     deployment_env = os.environ.copy()
     deployment_env['MACOSX_DEPLOYMENT_TARGET'] = deployment_target
 
   cmake_args = []
   # TODO(thakis): Unconditionally append this to base_cmake_args instead once
   # compiler-rt can build with clang-cl on Windows (http://llvm.org/PR23698)
@@ skipping 261 matching lines @@
     args.force_local_build = True
     if 'OS=android' not in os.environ.get('GYP_DEFINES', ''):
       # Only build the Android ASan rt on ToT bots when targetting Android.
       args.with_android = False
 
   return UpdateClang(args)
 
 
 if __name__ == '__main__':
   sys.exit(main())