Provide a switch to specify -fno-strict-aliasing

build/common.gypi

 # Copyright 2012 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 55 matching lines @@
 
     'v8_enable_disassembler%': 0,
 
     'v8_object_print%': 0,
 
     'v8_enable_gdbjit%': 0,
 
     # Enable profiling support. Only required on Windows.
     'v8_enable_prof%': 0,
 
+    # Some versions of GCC 4.5 seem to need -fno-strict-aliasing.
+    'v8_no_strict_aliasing%': 0,
+
     # Chrome needs this definition unconditionally. For standalone V8 builds,
     # it's handled in build/standalone.gypi.
     'want_separate_host_toolset%': 1,
 
     'v8_use_snapshot%': 'true',
     'host_os%': '<(OS)',
     'v8_use_liveobjectlist%': 'false',
     'werror%': '-Werror',
 
     # For a shared library build, results in "libv8-<(soname_version).so".
@@ skipping 134 matching lines @@
           },
         },
       }],
       ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
          or OS=="netbsd"', {
         'conditions': [
           [ 'target_arch=="ia32"', {
             'cflags': [ '-m32' ],
             'ldflags': [ '-m32' ],
           }],
-        ],
+          [ 'v8_no_strict_aliasing==1', {
+            'cflags': [ '-fno-strict-aliasing' ],
+          }],
+        ],  # conditions
       }],
       ['OS=="solaris"', {
         'defines': [ '__C99FEATURES__=1' ],  # isinf() etc.
       }],
     ],  # conditions
     'configurations': {
       'Debug': {
         'defines': [
           'DEBUG',
           'ENABLE_DISASSEMBLER',
@@ skipping 106 matching lines @@
                 # some test cases can cause stack overflow.
                 # 'StackReserveSize': '297152',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }