Clang scripts updates.

tools/clang/scripts/generate_win_compdb.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 """
 Clang tools on Windows are still a bit busted. The tooling can't handle
 backslashes in paths, doesn't understand how to read .rsp files, etc. In
 addition, ninja generates compile commands prefixed with the ninja msvc helper,
 which also confuses clang. This script generates a compile DB that should mostly
 work until clang tooling can be improved upstream.
 """
 
+import argparse
 import os
 import re
 import json
 import shlex
 import subprocess
 import sys
 
 
 _NINJA_MSVC_WRAPPER = re.compile('ninja -t msvc -e .+? -- ')
 _RSP_RE = re.compile(r' (@(.+?\.rsp)) ')
@@ skipping 29 matching lines @@
   # tooling. This should really only matter for command, but we do it for all
   # keys for consistency.
   e['directory'] = e['directory'].replace('\\', '/')
   e['command'] = e['command'].replace('\\', '/')
   e['file'] = e['file'].replace('\\', '/')
 
   return e
 
 
 def main(argv):
+  # Parse argument
+  parser = argparse.ArgumentParser()
+  parser.add_argument(
+      'build_path',
+      nargs='?',
+      help='Path to build directory',
+      default='out/Debug')
+  args = parser.parse_args()
   # First, generate the compile database.
   print 'Generating compile DB with ninja...'
   compile_db_as_json = subprocess.check_output(shlex.split(
-      'ninja -C out/Debug -t compdb cc cxx objc objcxx'))
+      'ninja -C %s -t compdb cc cxx objc objcxx' % args.build_path))
 
   compile_db = json.loads(compile_db_as_json)
   print 'Read in %d entries from the compile db' % len(compile_db)
   compile_db = [_ProcessEntry(e) for e in compile_db]
   original_length = len(compile_db)
 
   # Filter out NaCl stuff. The clang tooling chokes on them.
   compile_db = [e for e in compile_db if '_nacl.cc.pdb' not in e['command']
       and '_nacl_win64.cc.pdb' not in e['command']]
   print 'Filtered out %d entries...' % (original_length - len(compile_db))
-  f = file('out/Debug/compile_commands.json', 'w')
+  f = file('%s/compile_commands.json' % args.build_path, 'w')
   f.write(json.dumps(compile_db, indent=2))
   print 'Done!'
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))