-Wunused-functions for linux, android, chromeos

build/common.gypi

 # 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 3205 matching lines @@
                 ],
               }]]
           }],
           ['clang==1', {
             'cflags': [
               '-Wheader-hygiene',
 
               # Don't die on dtoa code that uses a char as an array index.
               '-Wno-char-subscripts',
 
-              # Clang spots more unused functions. TODO remove, crbug.com/315884
-              '-Wno-unused-function',
+              # TODO(thakis): This used to be implied by -Wno-unused-function,
+              # which we no longer use. Check if it makes sense to remove
+              # this as well. http://crbug.com/316352
+              '-Wno-unneeded-internal-declaration',
 
               # Warns on switches on enums that cover all enum values but
               # also contain a default: branch. Chrome is full of that.
               '-Wno-covered-switch-default',
 
               # Warns when a const char[] is converted to bool.
               '-Wstring-conversion',
 
               # C++11-related flags:
 
@@ skipping 1462 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }