update iOS build flags

gyp/common_conditions.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
@@ skipping 539 matching lines @@
             },
             'defines': [ 'NDEBUG' ],
           },
         },
         'xcode_settings': {
           'ARCHS': ['armv7'],
           'CODE_SIGNING_REQUIRED': 'NO',
           'IPHONEOS_DEPLOYMENT_TARGET': '<(ios_sdk_version)',
           'SDKROOT': 'iphoneos',
           'TARGETED_DEVICE_FAMILY': '1,2',
-          'OTHER_CPLUSPLUSFLAGS': [
-            '-std=c++0x',
-            '-stdlib=libc++',
-            '-fvisibility=hidden',
-            '-fvisibility-inlines-hidden',
-          ],
-          'GCC_THUMB_SUPPORT': 'NO',
+
+          'CLANG_CXX_LIBRARY':              'libc++',
+          'CLANG_CXX_LANGUAGE_STANDARD':    'c++11',
+          'GCC_ENABLE_CPP_EXCEPTIONS':      'NO',   # -fno-exceptions
+          'GCC_ENABLE_CPP_RTTI':            'NO',   # -fno-rtti
+          'GCC_THREADSAFE_STATICS':         'NO',   # -fno-threadsafe-statics
+          'GCC_SYMBOLS_PRIVATE_EXTERN':     'NO',   # -fvisibility=hidden
+          'GCC_INLINES_ARE_PRIVATE_EXTERN': 'NO',   # -fvisibility-inlines-hidden
+
+          'GCC_THUMB_SUPPORT': 'NO',  # TODO(mtklein): why would we not want thumb?
         },
       },
     ],
 
     [ 'skia_os == "android"',
       {
         'defines': [
           'SK_BUILD_FOR_ANDROID',
 
           # Android Text Tuning
@@ skipping 62 matching lines @@
           'LD_RUNPATH_SEARCH_PATHS': ['@executable_path/.'],
       },
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }