ARM: Makefile/gyp update allowing better control of ARM specific options.

Makefile

 # 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 69 matching lines @@
   GYPFLAGS += -Dv8_enable_extra_checks=0
 endif
 # gdbjit=on
 ifeq ($(gdbjit), on)
   GYPFLAGS += -Dv8_enable_gdbjit=1
 endif
 # vtunejit=on
 ifeq ($(vtunejit), on)
   GYPFLAGS += -Dv8_enable_vtunejit=1
 endif
-# vfp2=off
-ifeq ($(vfp2), off)
-  GYPFLAGS += -Dv8_can_use_vfp2_instructions=false
-else
-  GYPFLAGS += -Dv8_can_use_vfp2_instructions=true -Darm_fpu=vfpv2
-endif
-# vfp3=off
-ifeq ($(vfp3), off)
-  GYPFLAGS += -Dv8_can_use_vfp3_instructions=false
-else
-  GYPFLAGS += -Dv8_can_use_vfp3_instructions=true -Darm_fpu=vfpv3
-endif
 # debuggersupport=off
 ifeq ($(debuggersupport), off)
   GYPFLAGS += -Dv8_enable_debugger_support=0
 endif
+# unalignedaccess=on
+ifeq ($(unalignedaccess), on)
+  GYPFLAGS += -Dv8_can_use_unaligned_accesses=true
+endif
 # soname_version=1.2.3
 ifdef soname_version
   GYPFLAGS += -Dsoname_version=$(soname_version)
 endif
 # werror=no
 ifeq ($(werror), no)
   GYPFLAGS += -Dwerror=''
 endif
 # presubmit=no
 ifeq ($(presubmit), no)
   TESTFLAGS += --no-presubmit
 endif
 # strictaliasing=off (workaround for GCC-4.5)
 ifeq ($(strictaliasing), off)
   GYPFLAGS += -Dv8_no_strict_aliasing=1
 endif
 # regexp=interpreted
 ifeq ($(regexp), interpreted)
   GYPFLAGS += -Dv8_interpreted_regexp=1
 endif
-# hardfp=on
-ifeq ($(hardfp), on)
-  GYPFLAGS += -Dv8_use_arm_eabi_hardfloat=true
-endif
-# armv7=false
+# arm specific flags.
+# armv7=false/true
 ifeq ($(armv7), false)
   GYPFLAGS += -Darmv7=0
+else
+ifeq ($(armv7), true)
+  GYPFLAGS += -Darmv7=1
+else
+  GYPFLAGS += -Darmv7=default
+endif
+endif
+# vfp2=off. Deprecated, use armfpu=
+# vfp3=off. Deprecated, use armfpu=
+ifeq ($(vfp3), off)
+  GYPFLAGS += -Darm_fpu=vfp
+endif
+# hardfp=on/off. Deprecated, use armfloatabi
+ifeq ($(hardfp),on)
+  GYPFLAGS += -Darm_float_abi=hard
+else
+ifeq ($(hardfp),off)
+  GYPFLAGS += -Darm_float_abi=softfp
+endif
+endif
+# armneon=on/off
+ifeq ($(armneon), on)
+  GYPFLAGS += -Darm_neon=1
+endif
+# fpu: armfpu=xxx
+# xxx: vfp, vfpv3-d16, vfpv3, neon.
+ifeq ($(armfpu),)
+ifneq ($(vfp3), off)
+  GYPFLAGS += -Darm_fpu=default
+endif
+else
+  GYPFLAGS += -Darm_fpu=$(armfpu)
+endif
+# float abi: armfloatabi=softfp/hard
+ifeq ($(armfloatabi),)
+ifeq ($(hardfp),)
+  GYPFLAGS += -Darm_float_abi=default
+endif
+else
+  GYPFLAGS += -Darm_float_abi=$(armfloatabi)
+endif
+# armthumb=on/off
+ifeq ($(armthumb), off)
+  GYPFLAGS += -Darm_thumb=0
+else
+ifeq ($(armthumb), on)
+  GYPFLAGS += -Darm_thumb=1
+else
+  GYPFLAGS += -Darm_thumb=default
+endif
+endif
+# armtest=on
+# With this flag set, by default v8 will only use features implied
+# by the compiler (no probe). This is done by modifying the default
+# values of enable_armv7, enable_vfp2, enable_vfp3 and enable_32dregs.
+# Modifying these flags when launching v8 will enable the probing for
+# the specified values.
+# When using the simulator, this flag is implied.
+ifeq ($(armtest), on)
+  GYPFLAGS += -Darm_test=on
+else
+  GYPFLAGS += -Darm_test=off
 endif
 
 # ----------------- available targets: --------------------
 # - "dependencies": pulls in external dependencies (currently: GYP)
 # - any arch listed in ARCHES (see below)
 # - any mode listed in MODES
 # - every combination <arch>.<mode>, e.g. "ia32.release"
 # - "native": current host's architecture, release mode
 # - any of the above with .check appended, e.g. "ia32.release.check"
 # - "android": cross-compile for Android/ARM
@@ skipping 158 matching lines @@
 # Stores current GYPFLAGS in a file.
 $(ENVFILE).new:
         @mkdir -p $(OUTDIR); echo "GYPFLAGS=$(GYPFLAGS)" > $(ENVFILE).new; \
             echo "CXX=$(CXX)" >> $(ENVFILE).new
 
 # Dependencies.
 # Remember to keep these in sync with the DEPS file.
 dependencies:
         svn checkout --force http://gyp.googlecode.com/svn/trunk build/gyp \
             --revision 1501