Make GYP build usable for day-to-day work

build/v8-features.gypi

Index: build/v8-features.gypi
diff --git a/build/v8-features.gypi b/build/v8-features.gypi
index 40374523ad56263ed2f50e7a5f0f932e1c796123..cb9b61ce93e69a57cf66cc0c2259e88522e0d65d 100644
--- a/build/v8-features.gypi
+++ b/build/v8-features.gypi
@@ -89,6 +89,19 @@
                   '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'],
               }],
             ],
           }],