Prepare for -Wall for third-party code, -Wextra for chromium_code

base/allocator/allocator.gyp

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       # This code gets run a lot and debugged rarely, so it should be fast
       # by default. See http://crbug.com/388949.
       'debug_optimize': '2',
@@ skipping 266 matching lines @@
             '<(tcmalloc_dir)/src/stacktrace_powerpc-inl.h',
             '<(tcmalloc_dir)/src/stacktrace_win32-inl.h',
             '<(tcmalloc_dir)/src/stacktrace_with_context.cc',
             '<(tcmalloc_dir)/src/stacktrace_x86-inl.h',
             '<(tcmalloc_dir)/src/tcmalloc_guard.h',
 
             # Included by debugallocation_shim.cc.
             '<(tcmalloc_dir)/src/debugallocation.cc',
             '<(tcmalloc_dir)/src/tcmalloc.cc',
           ],
+          'variables': {
+            'clang_warning_flags': [
+              # tcmalloc initializes some fields in the wrong order.
+              '-Wno-reorder',
+              # tcmalloc contains some unused local template specializations.
+              '-Wno-unused-function',
+              # tcmalloc uses COMPILE_ASSERT without static_assert but with
+              # typedefs.
+              '-Wno-unused-local-typedefs',
+              # for magic2_ in debugallocation.cc (only built in Debug builds)
+              # typedefs.
+              '-Wno-unused-private-field',
+            ],
+          },
           'conditions': [
             ['OS=="linux" or OS=="freebsd" or OS=="solaris" or OS=="android"', {
               'sources!': [
                 '<(tcmalloc_dir)/src/system-alloc.h',
               ],
               # We enable all warnings by default, but upstream disables a few.
               # Keep "-Wno-*" flags in sync with upstream by comparing against:
               # http://code.google.com/p/google-perftools/source/browse/trunk/Makefile.am
               'cflags': [
                 '-Wno-sign-compare',
@@ skipping 82 matching lines @@
                 '<(SHARED_INTERMEDIATE_DIR)/allocator',
                 '<(target_arch)',
               ],
             },
           ],
         },
       ],
     }],
   ],
 }