Add GCC and clang warning flags from WebKit to ANGLE Mac and Linux builds

build/common.gypi

@@ -5,6 +5,22 @@
 {
   'variables': {
     'component%': 'static_library',
+    'gcc_or_clang_warnings': [
+      '-Wall',
+      '-Wchar-subscripts',
+      '-Werror',
+      '-Wextra',
+      '-Wformat=2',
+      '-Winit-self',
+      '-Wno-sign-compare',
+      '-Wno-unused-function',
+      '-Wno-unused-parameter',
+      '-Wno-unknown-pragmas',
+      '-Wpacked',
+      '-Wpointer-arith',
+      '-Wundef',
+      '-Wwrite-strings',
+    ],
   },
   'target_defaults': {
     'default_configuration': 'Debug',

src/build_angle.gyp

@@ -43,6 +43,16 @@
         'compiler/preprocessor/new/Tokenizer.cpp',
         'compiler/preprocessor/new/Tokenizer.h',
       ],
+      'conditions': [
+        ['OS=="mac"', {
+          'xcode_settings': {
+            'WARNING_CFLAGS': ['<@(gcc_or_clang_warnings)']
+          },
+        }],
+        ['OS=="linux"', {
+          'cflags': ['<@(gcc_or_clang_warnings)']
+        }],
+      ],
     },
     {
       'target_name': 'translator_common',
@@ -154,6 +164,14 @@
         }, { # else: posix
           'sources': ['compiler/ossource_posix.cpp'],
         }],
+        ['OS=="mac"', {
+          'xcode_settings': {
+            'WARNING_CFLAGS': ['<@(gcc_or_clang_warnings)']
+          },
+        }],
+        ['OS=="linux"', {
+          'cflags': ['<@(gcc_or_clang_warnings)']
+        }],
       ],
     },
     {
@@ -183,6 +201,16 @@
         'compiler/VersionGLSL.cpp',
         'compiler/VersionGLSL.h',
       ],
+      'conditions': [
+        ['OS=="mac"', {
+          'xcode_settings': {
+            'WARNING_CFLAGS': ['<@(gcc_or_clang_warnings)']
+          },
+        }],
+        ['OS=="linux"', {
+          'cflags': ['<@(gcc_or_clang_warnings)']
+        }],
+      ],
     },
   ],
   'conditions': [