Prepare for using GYP build on buildbots

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 119 matching lines @@
 ENVFILE = $(OUTDIR)/environment
 
 .PHONY: all check clean dependencies $(ENVFILE).new native \
         $(ARCHES) $(MODES) $(BUILDS) $(CHECKS) $(addsuffix .clean,$(ARCHES)) \
         $(addsuffix .check,$(MODES)) $(addsuffix .check,$(ARCHES)) \
         must-set-ANDROID_NDK_ROOT
 
 # 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)"
+
 # Compile targets. MODES and ARCHES are convenience targets.
 .SECONDEXPANSION:
 $(MODES): $(addsuffix .$$@,$(DEFAULT_ARCHES))
 
 $(ARCHES): $(addprefix $$@.,$(MODES))
 
 # 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)" \
@@ skipping 90 matching lines @@
 
 # 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