Mimic Chrome better in our GYPs.

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 209 matching lines @@
           '-Wextra',
           '-Winit-self',
           '-Wpointer-arith',
           '-Wsign-compare',
 
           '-Wno-unused-parameter',
         ],
         'cflags_cc': [
           '-std=c++11',
           '-fno-rtti',
+          '-fno-threadsafe-statics',
           '-Wnon-virtual-dtor',
         ],
         'conditions': [
           [ 'skia_fast', { 'cflags': [ '<@(skia_fast_flags)' ] }],
           [ 'skia_os != "chromeos"', {
             'conditions': [
               [ 'skia_arch_type == "x86_64" and not skia_android_framework', {
                 'cflags': [
                   '-m64',
                 ],
@@ skipping 245 matching lines @@
             [ 'skia_warnings_as_errors', { 'GCC_TREAT_WARNINGS_AS_ERRORS': 'YES' }],
             [ 'skia_arch_type == "x86"', { 'ARCHS': ['i386']   }],
             [ 'skia_arch_type == "x86_64"', { 'ARCHS': ['x86_64'] }],
             [ 'skia_osx_deployment_target==""', {
               'MACOSX_DEPLOYMENT_TARGET': '10.6', # -mmacos-version-min, passed in env to ld.
             }, {
               'MACOSX_DEPLOYMENT_TARGET': '<(skia_osx_deployment_target)',
             }],
           ],
           '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_ENABLE_SUPPLEMENTAL_SSE3_INSTRUCTIONS': 'YES',  # -mssse3
           'GCC_SYMBOLS_PRIVATE_EXTERN':                'NO',   # -fvisibility=hidden
           'GCC_INLINES_ARE_PRIVATE_EXTERN':            'NO',   # -fvisibility-inlines-hidden
           'GCC_CW_ASM_SYNTAX':                         'NO',   # remove -fasm-blocks
           'GCC_ENABLE_PASCAL_STRINGS':                 'NO',   # remove -mpascal-strings
           'WARNING_CFLAGS': [
             '-Wall',
             '-Wextra',
             '-Winit-self',
             '-Wpointer-arith',
@@ skipping 112 matching lines @@
     [ 'sknx_no_simd', {
       'defines': [ 'SKNX_NO_SIMD' ],
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }