Make GYP build usable for day-to-day work (second attempt)

build/v8-features.gypi

 # 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 @@
               [ 'v8_can_use_vfp_instructions=="true"', {
                 'defines': [
                   'CAN_USE_VFP_INSTRUCTIONS',
                 ],
               }],
               [ 'v8_use_arm_eabi_hardfloat=="true"', {
                 'defines': [
                   'USE_EABI_HARDFLOAT=1',
                   'CAN_USE_VFP_INSTRUCTIONS',
                 ],
+                'cflags': [
+                  '-mfloat-abi=hard',
+                ],
+              }, {
+                'defines': [
+                  'USE_EABI_HARDFLOAT=0',
+                ],
+              }],
+              # The ARM assembler assumes the host is 32 bits,
+              # so force building 32-bit host tools.
+              [ 'host_arch=="x64"', {
+                'cflags': ['-m32'],
+                'ldflags': ['-m32'],
               }],
             ],
           }],
           ['v8_target_arch=="ia32"', {
             'defines': [
               'V8_TARGET_ARCH_IA32',
             ],
           }],
           ['v8_target_arch=="mips"', {
             'defines': [
@@ skipping 14 matching lines @@
           'DEBUG',
           '_DEBUG',
           'ENABLE_DISASSEMBLER',
           'V8_ENABLE_CHECKS',
           'OBJECT_PRINT',
         ],
       }
     }
   }
 }