Don't raise for GYP_GENERATORS=dump_dependency_json, don't warn when using gyp_env

build/landmines.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 runs every build as a hook. If it detects that the build should
 be clobbered, it will touch the file <build_dir>/.landmine_triggered. The
 various build scripts will then check for the presence of this file and clobber
 accordingly. The script will also emit the reasons for the clobber to stdout.
 
 A landmine is tripped when a builder checks out a different revision, and the
 diff between the new landmines and the old ones is non-null. At this point, the
 build is clobbered.
 """
 
 import difflib
-import gyp_helper
 import logging
 import optparse
 import os
 import sys
 import subprocess
 import time
 
 import landmine_utils
 
 
@@ skipping 77 matching lines @@
 
   extra_script = os.environ.get('EXTRA_LANDMINES_SCRIPT')
   if extra_script:
     return options.landmine_scripts + [extra_script]
   else:
     return options.landmine_scripts
 
 
 def main():
   landmine_scripts = process_options()
-  gyp_helper.apply_chromium_gyp_env()
+
+  if landmine_utils.builder() == 'dump_dependency_json':
+    return 0
 
   for target in ('Debug', 'Release', 'Debug_x64', 'Release_x64'):
     landmines = []
     for s in landmine_scripts:
       proc = subprocess.Popen([sys.executable, s, '-t', target],
                               stdout=subprocess.PIPE)
       output, _ = proc.communicate()
       landmines.extend([('%s\n' % l.strip()) for l in output.splitlines()])
     set_up_landmines(target, landmines)
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())