When compiling C++, CXXFLAGS *and* CCFLAGS are used, so there is no need to pass

SConstruct

 # Copyright 2011 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 71 matching lines @@
       'CPPDEFINES':   ['V8_FAST_TLS'],
     },
     'liveobjectlist:on': {
       'CPPDEFINES':   ['ENABLE_DEBUGGER_SUPPORT', 'INSPECTOR',
                        'LIVE_OBJECT_LIST', 'OBJECT_PRINT'],
     }
   },
   'gcc': {
     'all': {
       'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
-      'CXXFLAGS':     ['$CCFLAGS', '-fno-rtti', '-fno-exceptions'],
+      'CXXFLAGS':     ['-fno-rtti', '-fno-exceptions'],
     },
     'visibility:hidden': {
       # Use visibility=default to disable this.
       'CXXFLAGS':     ['-fvisibility=hidden']
     },
     'strictaliasing:off': {
       'CCFLAGS':      ['-fno-strict-aliasing']
     },
     'mode:debug': {
       'CCFLAGS':      ['-g', '-O0'],
@@ skipping 120 matching lines @@
     'gdbjit:on': {
       'CPPDEFINES':   ['ENABLE_GDB_JIT_INTERFACE']
     },
     'compress_startup_data:bz2': {
       'CPPDEFINES':   ['COMPRESS_STARTUP_DATA_BZ2']
     }
   },
   'msvc': {
     'all': {
       'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
-      'CXXFLAGS':     ['$CCFLAGS', '/GR-', '/Gy'],
+      'CXXFLAGS':     ['/GR-', '/Gy'],
       'CPPDEFINES':   ['WIN32'],
       'LINKFLAGS':    ['/INCREMENTAL:NO', '/NXCOMPAT', '/IGNORE:4221'],
       'CCPDBFLAGS':   ['/Zi']
     },
     'verbose:off': {
       'DIALECTFLAGS': ['/nologo'],
       'ARFLAGS':      ['/NOLOGO']
     },
     'arch:ia32': {
       'CPPDEFINES':   ['V8_TARGET_ARCH_IA32', '_USE_32BIT_TIME_T'],
@@ skipping 157 matching lines @@
   'all': {
     'CPPPATH': [join(root_dir, 'src')],
     'library:shared': {
       'CPPDEFINES': ['USING_V8_SHARED']
     },
   },
   'gcc': {
     'all': {
       'LIBPATH':      [abspath('.')],
       'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
-      'CXXFLAGS':     ['$CCFLAGS', '-fno-rtti', '-fno-exceptions'],
+      'CXXFLAGS':     ['-fno-rtti', '-fno-exceptions'],
       'LINKFLAGS':    ['$CCFLAGS'],
     },
     'os:linux': {
       'LIBS':         ['pthread'],
     },
     'os:macos': {
       'LIBS':         ['pthread'],
     },
     'os:freebsd': {
       'LIBS':         ['execinfo', 'pthread']
@@ skipping 32 matching lines @@
   'all': {
     'CPPPATH': [join(abspath('.'), 'include')],
     'library:shared': {
       'CPPDEFINES': ['USING_V8_SHARED']
     },
   },
   'gcc': {
     'all': {
       'LIBPATH':      ['.'],
       'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
-      'CXXFLAGS':     ['$CCFLAGS', '-fno-rtti', '-fno-exceptions'],
+      'CXXFLAGS':     ['-fno-rtti', '-fno-exceptions'],
       'LINKFLAGS':    ['$CCFLAGS'],
     },
     'os:linux': {
       'LIBS':         ['pthread'],
     },
     'os:macos': {
       'LIBS':         ['pthread'],
     },
     'os:freebsd': {
       'LIBPATH' :     ['/usr/local/lib'],
@@ skipping 155 matching lines @@
   'all': {
     'CPPPATH': [join(abspath('.'), 'include'), join(abspath('.'), 'src')],
     'library:shared': {
       'CPPDEFINES': ['USING_V8_SHARED']
     },
   },
   'gcc': {
     'all': {
       'LIBPATH':      ['.'],
       'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
-      'CXXFLAGS':     ['$CCFLAGS', '-fno-rtti', '-fno-exceptions'],
+      'CXXFLAGS':     ['-fno-rtti', '-fno-exceptions'],
       'LINKFLAGS':    ['$CCFLAGS'],
     },
     'os:win32': {
       'LIBS':         ['winmm', 'ws2_32']
     },
     'arch:arm': {
       'LINKFLAGS':   ARM_LINK_FLAGS,
       'armeabi:soft' : {
         'CPPDEFINES' : ['USE_EABI_HARDFLOAT=0'],
         'simulator:none': {
@@ skipping 127 matching lines @@
       }
     }
   }
 }
 
 
 D8_FLAGS = {
   'gcc': {
     'all': {
       'CCFLAGS': ['$DIALECTFLAGS', '$WARNINGFLAGS'],
-      'CXXFLAGS': ['$CCFLAGS', '-fno-rtti', '-fno-exceptions'],
+      'CXXFLAGS': ['-fno-rtti', '-fno-exceptions'],
       'LINKFLAGS': ['$CCFLAGS'],
     },
     'console:readline': {
       'LIBS': ['readline']
     },
     'os:linux': {
       'LIBS': ['pthread'],
     },
     'os:macos': {
       'LIBS': ['pthread'],
@@ skipping 684 matching lines @@
 # version of scons.  Also, there's a bug in some revisions that
 # doesn't allow this flag to be set, so we swallow any exceptions.
 # Lovely.
 try:
   SetOption('warn', 'no-deprecated')
 except:
   pass
 
 
 Build()