Enable more compilation checks in clang

These checks were disabled in Chromium due to historical reason.

Also fix compilation errors as a result of the above mentioned change.

Change-Id: I5d240f2f11aa5920598f954d696a15bdcbf78fd8

common.gypi

@@ -0,0 +1,33 @@
+# Copyright 2014 Google Inc. All rights reserved.
+#
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+#
+# This file contains common settings for building packager components.
+
+{
+  'variables': {
+    # Compile as Chromium code to enable warnings and warnings-as-errors.
+    'chromium_code': 1,
+  },
+  'target_defaults': {
+    'include_dirs': [
+      '.',
+    ],
+    'conditions': [
+      ['clang==1', {
+        # Revert the relevant settings in Chromium's common.gypi.
+        'cflags!': [
+          '-Wno-char-subscripts',
+          '-Wno-unneeded-internal-declaration',
+          '-Wno-covered-switch-default',
+
+          # C++11-related flags:
+          '-Wno-c++11-narrowing',
+          '-Wno-reserved-user-defined-literal',
+        ],
+      }],
+    ],
+  },
+}

media/base/container_names.cc

@@ -13,9 +13,11 @@
 
 namespace media {
 
-#define TAG(a, b, c, d) \
-    ((static_cast<uint8>(a) << 24) | (static_cast<uint8>(b) << 16) | \
-     (static_cast<uint8>(c) << 8) | (static_cast<uint8>(d)))
+#define TAG(a, b, c, d)                                           \
+  ((static_cast<uint32>(static_cast<uint8>(a)) << 24) |           \
+   (static_cast<uint8>(b) << 16) |                                \
+   (static_cast<uint8>(c) << 8) |                                 \
+   (static_cast<uint8>(d)))
 
 #define RCHECK(x)     \
     do {              \

media/base/media_base.gyp

@@ -5,15 +5,9 @@
 # https://developers.google.com/open-source/licenses/bsd
 
 {
-  'variables': {
-    # Compile as chromium code to enable warnings and warnings-as-errors.
-    'chromium_code': 1,
-  },
-  'target_defaults': {
-    'include_dirs': [
-      '../..',
-    ],
-  },
+  'includes': [
+    '../../common.gypi',
+  ],
   'targets': [
     {
       'target_name': 'base',

media/event/media_event.gyp

@@ -5,15 +5,9 @@
 # https://developers.google.com/open-source/licenses/bsd
 
 {
-  'variables': {
-    # Compile as chromium code to enable warnings and warnings-as-errors.
-    'chromium_code': 1,
-  },
-  'target_defaults': {
-    'include_dirs': [
-      '../..',
-    ],
-  },
+  'includes': [
+    '../../common.gypi',
+  ],
   'targets': [
     {
       'target_name': 'media_event',

media/file/file.gyp

@@ -5,15 +5,9 @@
 # https://developers.google.com/open-source/licenses/bsd
 
 {
-  'variables': {
-    # Compile as chromium code to enable warnings and warnings-as-errors.
-    'chromium_code': 1,
-  },
-  'target_defaults': {
-    'include_dirs': [
-      '../..',
-    ],
-  },
+  'includes': [
+    '../../common.gypi',
+  ],
   'targets': [
     {
       'target_name': 'file',

media/filters/filters.gyp

@@ -5,15 +5,9 @@
 # https://developers.google.com/open-source/licenses/bsd
 
 {
-  'variables': {
-    # Compile as chromium code to enable warnings and warnings-as-errors.
-    'chromium_code': 1,
-  },
-  'target_defaults': {
-    'include_dirs': [
-      '../..',
-    ],
-  },
+  'includes': [
+    '../../common.gypi',
+  ],
   'targets': [
     {
       'target_name': 'filters',

media/formats/mp2t/mp2t.gyp

@@ -5,15 +5,9 @@
 # https://developers.google.com/open-source/licenses/bsd
 
 {
-  'variables': {
-    # Compile as chromium code to enable warnings and warnings-as-errors.
-    'chromium_code': 1,
-  },
-  'target_defaults': {
-    'include_dirs': [
-      '../../..',
-    ],
-  },
+  'includes': [
+    '../../../common.gypi',
+  ],
   'targets': [
     {
       'target_name': 'mp2t',

media/formats/mp4/mp4.gyp

@@ -5,15 +5,9 @@
 # https://developers.google.com/open-source/licenses/bsd
 
 {
-  'variables': {
-    # Compile as chromium code to enable warnings and warnings-as-errors.
-    'chromium_code': 1,
-  },
-  'target_defaults': {
-    'include_dirs': [
-      '../../..',
-    ],
-  },
+  'includes': [
+    '../../../common.gypi',
+  ],
   'targets': [
     {
       'target_name': 'mp4',

media/formats/mpeg/mpeg.gyp

@@ -5,15 +5,9 @@
 # https://developers.google.com/open-source/licenses/bsd
 
 {
-  'variables': {
-    # Compile as chromium code to enable warnings and warnings-as-errors.
-    'chromium_code': 1,
-  },
-  'target_defaults': {
-    'include_dirs': [
-      '../../..',
-    ],
-  },
+  'includes': [
+    '../../../common.gypi',
+  ],
   'targets': [
     {
       'target_name': 'mpeg',

media/test/media_test.gyp

@@ -5,15 +5,9 @@
 # https://developers.google.com/open-source/licenses/bsd
 
 {
-  'variables': {
-    # Compile as chromium code to enable warnings and warnings-as-errors.
-    'chromium_code': 1,
-  },
-  'target_defaults': {
-    'include_dirs': [
-      '../..',
-    ],
-  },
+  'includes': [
+    '../../common.gypi',
+  ],
   'targets': [
     {
       'target_name': 'run_all_unittests',

mpd/mpd.gyp

@@ -7,15 +7,9 @@
 # GYP file for any MPD generation targets.
 
 {
-  'variables': {
-    # Compile as chromium code to enable warnings and warnings-as-errors.
-    'chromium_code': 1,
-  },
-  'target_defaults': {
-    'include_dirs': [
-      '..',
-    ],
-  },
+  'includes': [
+    '../common.gypi',
+  ],
   'targets': [
     {
       'target_name': 'media_info_proto',

packager.gyp

@@ -5,15 +5,9 @@
 # https://developers.google.com/open-source/licenses/bsd
 
 {
-  'variables': {
-    # Compile as chromium code to enable warnings and warnings-as-errors.
-    'chromium_code': 1,
-  },
-  'target_defaults': {
-    'include_dirs': [
-      '.',
-    ],
-  },
+  'includes': [
+    'common.gypi',
+  ],
   'targets': [
     {
       'target_name': 'packager',