Add option to build using a standalone Android toolchain without Android NDK.

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 16 matching lines @@
 
 
 # Variable default definitions. Override them by exporting them in your shell.
 CXX ?= g++
 LINK ?= g++
 OUTDIR ?= out
 TESTJOBS ?= -j16
 GYPFLAGS ?=
 TESTFLAGS ?=
 ANDROID_NDK_ROOT ?=
+ANDROID_TOOLCHAIN ?=
 ANDROID_V8 ?= /data/local/v8
 
 # Special build flags. Use them like this: "make library=shared"
 
 # library=shared || component=shared_library
 ifeq ($(library), shared)
   GYPFLAGS += -Dcomponent=shared_library
 endif
 ifdef component
   GYPFLAGS += -Dcomponent=$(component)
@@ skipping 87 matching lines @@
 # Generates corresponding test targets, e.g. "ia32.release.check".
 CHECKS = $(addsuffix .check,$(BUILDS))
 ANDROID_CHECKS = $(addsuffix .check,$(ANDROID_BUILDS))
 # File where previously used GYPFLAGS are stored.
 ENVFILE = $(OUTDIR)/environment
 
 .PHONY: all check clean dependencies $(ENVFILE).new native \
         $(ARCHES) $(MODES) $(BUILDS) $(CHECKS) $(addsuffix .clean,$(ARCHES)) \
         $(addsuffix .check,$(MODES)) $(addsuffix .check,$(ARCHES)) \
         $(ANDROID_ARCHES) $(ANDROID_BUILDS) $(ANDROID_CHECKS) \
-        must-set-ANDROID_NDK_ROOT
+        must-set-ANDROID_NDK_ROOT_OR_TOOLCHAIN
 
 # Target definitions. "all" is the default.
 all: $(MODES)
 
 # Special target for the buildbots to use. Depends on $(OUTDIR)/Makefile
 # having been created before.
 buildbot:
         $(MAKE) -C "$(OUTDIR)" BUILDTYPE=$(BUILDTYPE) \
                 builddir="$(abspath $(OUTDIR))/$(BUILDTYPE)"
 
@@ skipping 16 matching lines @@
                  builddir="$(shell pwd)/$(OUTDIR)/$@"
 
 native: $(OUTDIR)/Makefile.native
         @$(MAKE) -C "$(OUTDIR)" -f Makefile.native \
                  CXX="$(CXX)" LINK="$(LINK)" BUILDTYPE=Release \
                  builddir="$(shell pwd)/$(OUTDIR)/$@"
 
 $(ANDROID_ARCHES): $(addprefix $$@.,$(MODES))
 
 $(ANDROID_BUILDS): $(GYPFILES) $(ENVFILE) build/android.gypi \
-                   must-set-ANDROID_NDK_ROOT Makefile.android
+                   must-set-ANDROID_NDK_ROOT_OR_TOOLCHAIN Makefile.android
         @$(MAKE) -f Makefile.android $@ \
                 ARCH="$(basename $@)" \
                 MODE="$(subst .,,$(suffix $@))" \
                 OUTDIR="$(OUTDIR)" \
                 GYPFLAGS="$(GYPFLAGS)"
 
 # Test targets.
 check: all
         @tools/test-wrapper-gypbuild.py $(TESTJOBS) --outdir=$(OUTDIR) \
             --arch=$(shell echo $(DEFAULT_ARCHES) | sed -e 's/ /,/g') \
@@ skipping 49 matching lines @@
         build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
                       -Ibuild/standalone.gypi --depth=. \
                       -Dv8_target_arch=$(subst .,,$(suffix $@)) \
                       -S.$(subst .,,$(suffix $@)) $(GYPFLAGS)
 
 $(OUTDIR)/Makefile.native: $(GYPFILES) $(ENVFILE)
         GYP_GENERATORS=make \
         build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
                       -Ibuild/standalone.gypi --depth=. -S.native $(GYPFLAGS)
 
-must-set-ANDROID_NDK_ROOT:
+must-set-ANDROID_NDK_ROOT_OR_TOOLCHAIN:
 ifndef ANDROID_NDK_ROOT
-          $(error ANDROID_NDK_ROOT is not set)
+ifndef ANDROID_TOOLCHAIN
+          $(error ANDROID_NDK_ROOT or ANDROID_TOOLCHAIN must be set))
+endif
 endif
 
 # Replaces the old with the new environment file if they're different, which
 # will trigger GYP to regenerate Makefiles.
 $(ENVFILE): $(ENVFILE).new
         @if test -r $(ENVFILE) && cmp $(ENVFILE).new $(ENVFILE) >/dev/null; \
             then rm $(ENVFILE).new; \
             else mv $(ENVFILE).new $(ENVFILE); fi
 
 # Stores current GYPFLAGS in a file.
 $(ENVFILE).new:
         @mkdir -p $(OUTDIR); echo "GYPFLAGS=$(GYPFLAGS)" > $(ENVFILE).new; \
             echo "CXX=$(CXX)" >> $(ENVFILE).new
 
 # Dependencies.
 dependencies:
         svn checkout --force http://gyp.googlecode.com/svn/trunk build/gyp \
             --revision 1282