Improve javac.py --incremental logic by having it recompile more files

build/android/gyp/util/md5_check.py

 # Copyright 2013 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.
 
 import difflib
 import hashlib
 import itertools
 import json
 import os
 import sys
 import zipfile
 
 
 # When set and a difference is detected, a diff of what changed is printed.
-_PRINT_MD5_DIFFS = int(os.environ.get('PRINT_MD5_DIFFS', 0))
+PRINT_EXPLANATIONS = int(os.environ.get('PRINT_INCREMENTAL_EXPLANATIONS', 0))
 
 
 def CallAndRecordIfStale(
     function, record_path=None, input_paths=None, input_strings=None,
     output_paths=None, force=False, pass_changes=False):
   """Calls function if outputs are stale.
 
   Outputs are considered stale if:
   - any output_paths are missing, or
   - the contents of any file within input_paths has changed, or
   - the contents of input_strings has changed.
 
   To debug which files are out-of-date, set the environment variable:
-      PRINT_MD5_DIFFS=1
+      PRINT_INCREMENTAL_EXPLANATIONS=1
 
   Args:
     function: The function to call.
     record_path: Path to record metadata.
       Defaults to output_paths[0] + '.md5.stamp'
     input_paths: List of paths to calcualte an md5 sum on.
     input_strings: List of strings to record verbatim.
     output_paths: List of output paths.
     force: Whether to treat outputs as missing regardless of whether they
       actually are.
@@ skipping 26 matching lines @@
     with open(record_path, 'r') as jsonfile:
       try:
         old_metadata = _Metadata.FromFile(jsonfile)
       except:  # pylint: disable=bare-except
         pass  # Not yet using new file format.
 
   changes = Changes(old_metadata, new_metadata, force, missing_outputs)
   if not changes.HasChanges():
     return
 
-  if _PRINT_MD5_DIFFS:
+  if PRINT_EXPLANATIONS:
     print '=' * 80
     print 'Target is stale: %s' % record_path
     print changes.DescribeDifference()
     print '=' * 80
 
   # Delete the old metdata beforehand since failures leave it in an
   # inderterminate state.
   if old_metadata:
     os.unlink(record_path)
 
@@ skipping 303 matching lines @@
 
 def _ExtractZipEntries(path):
   """Returns a list of (path, CRC32) of all files within |path|."""
   entries = []
   with zipfile.ZipFile(path) as zip_file:
     for zip_info in zip_file.infolist():
       # Skip directories and empty files.
       if zip_info.CRC:
         entries.append((zip_info.filename, zip_info.CRC))
   return entries