In build/gyp_chromium, if CHROMIUM_GYP_SYNTAX_CHECK is set to 1, run gyp with --check.

build/gyp_chromium

 #!/usr/bin/python
 
 # Copyright (c) 2009 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 wrapper for Chromium that adds some support for how GYP
 # is invoked by Chromium beyond what can be done in the gclient hooks.
 
 import glob
@@ skipping 64 matching lines @@
   # There shouldn't be a circular dependency relationship between .gyp files,
   # but in Chromium's .gyp files, on non-Mac platforms, circular relationships
   # currently exist.  The check for circular dependencies is currently
   # bypassed on other platforms, but is left enabled on the Mac, where a
   # violation of the rule causes Xcode to misbehave badly.
   # TODO(mark): Find and kill remaining circular dependencies, and remove this
   # option.  http://crbug.com/35878.
   if sys.platform != 'darwin':
     args.append('--no-circular-check')
 
+  # If CHROMIUM_GYP_SYNTAX_CHECK is set to 1, it will invoke gyp with --check
+  # to enfore syntax checking.
+  syntax_check = os.environ.get('CHROMIUM_GYP_SYNTAX_CHECK')
+  if syntax_check and int(syntax_check):

[Mark Mentovai, 2010/03/26 17:53:45]

bool() is marginally closer to what you mean than int() and the effect is the
same.

[Robert Sesek, 2010/03/26 17:57:35]

That's what I thought, too. But |bool("0") == True| as does bool("1"). |bool(0)
== False|, though.

+    args.append('--check')
+
   print 'Updating projects from gyp files...'
   sys.stdout.flush()
 
   # Off we go...
   sys.exit(gyp.main(args))