Added cross-build option in Makefile wrapper for gyp.

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 15 matching lines @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 
 # Variable default definitions. Override them by exporting them in your shell.
 CXX ?= g++
 LINK ?= g++
 OUTDIR ?= out
 TESTJOBS ?= -j16
 GYPFLAGS ?=
 TESTFLAGS ?=
+BUILDTYPE ?= Release
 ANDROID_NDK_ROOT ?=
 ANDROID_TOOL_PREFIX = $(ANDROID_NDK_ROOT)/toolchain/bin/arm-linux-androideabi
 
 # 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
@@ skipping 100 matching lines @@
 # Defines how to build a particular target (e.g. ia32.release).
 $(BUILDS): $(OUTDIR)/Makefile-$$(basename $$@)
         @$(MAKE) -C "$(OUTDIR)" -f Makefile-$(basename $@) \
                  CXX="$(CXX)" LINK="$(LINK)" \
                  BUILDTYPE=$(shell echo $(subst .,,$(suffix $@)) | \
                              python -c "print raw_input().capitalize()") \
                  builddir="$(shell pwd)/$(OUTDIR)/$@"
 
 native: $(OUTDIR)/Makefile-native
         @$(MAKE) -C "$(OUTDIR)" -f Makefile-native \
-                 CXX="$(CXX)" LINK="$(LINK)" BUILDTYPE=Release \
+                 CXX="$(CXX)" LINK="$(LINK)" BUILDTYPE=$(BUILDTYPE) \
+                 builddir="$(shell pwd)/$(OUTDIR)/$@"
+
+cross: $(OUTDIR)/Makefile-cross
+        @$(MAKE) -C "$(OUTDIR)" -f Makefile-cross BUILDTYPE=$(BUILDTYPE) \
                  builddir="$(shell pwd)/$(OUTDIR)/$@"
 
 # TODO(jkummerow): add "android.debug" when we need it.
 android android.release: $(OUTDIR)/Makefile-android
         @$(MAKE) -C "$(OUTDIR)" -f Makefile-android \
                 CXX="$(ANDROID_TOOL_PREFIX)-g++" \
                 AR="$(ANDROID_TOOL_PREFIX)-ar" \
                 RANLIB="$(ANDROID_TOOL_PREFIX)-ranlib" \
                 CC="$(ANDROID_TOOL_PREFIX)-gcc" \
                 LD="$(ANDROID_TOOL_PREFIX)-ld" \
@@ skipping 33 matching lines @@
 native.clean:
         rm -f $(OUTDIR)/Makefile-native
         rm -rf $(OUTDIR)/native
         find $(OUTDIR) -regex '.*\(host\|target\)-native\.mk' -delete
 
 android.clean:
         rm -f $(OUTDIR)/Makefile-android
         rm -rf $(OUTDIR)/android.release
         find $(OUTDIR) -regex '.*\(host\|target\)-android\.mk' -delete
 
-clean: $(addsuffix .clean,$(ARCHES)) native.clean
+cross.clean:
+        rm -f $(OUTDIR)/Makefile-cross
+        rm -rf $(OUTDIR)/cross
+        find $(OUTDIR) -regex '.*\(host\|target\)-cross\.mk' -delete
+
+clean: $(addsuffix .clean,$(ARCHES)) native.clean cross.clean
 
 # GYP file generation targets.
 $(OUTDIR)/Makefile-ia32: $(GYPFILES) $(ENVFILE)
         GYP_GENERATORS=make \
         build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
                       -Ibuild/standalone.gypi --depth=. -Dtarget_arch=ia32 \
                       -S-ia32 $(GYPFLAGS)
 
 $(OUTDIR)/Makefile-x64: $(GYPFILES) $(ENVFILE)
         GYP_GENERATORS=make \
@@ skipping 11 matching lines @@
         GYP_GENERATORS=make \
         build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
                       -Ibuild/standalone.gypi --depth=. -Ibuild/mipsu.gypi \
                       -S-mips $(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)
 
+$(OUTDIR)/Makefile-cross: $(GYPFILES) $(ENVFILE)
+        build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
+                      -Ibuild/standalone.gypi --depth=. \
+                      -Dtarget_arch=$(target) -S-cross $(GYPFLAGS)
+
 $(OUTDIR)/Makefile-android: $(GYPFILES) $(ENVFILE) build/android.gypi \
                             must-set-ANDROID_NDK_ROOT
         GYP_GENERATORS=make \
         CC="${ANDROID_TOOL_PREFIX}-gcc" \
         build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
                       -Ibuild/standalone.gypi --depth=. -Ibuild/android.gypi \
                       -S-android $(GYPFLAGS)
 
 must-set-ANDROID_NDK_ROOT:
 ifndef ANDROID_NDK_ROOT
           $(error ANDROID_NDK_ROOT is not set)
 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