Add Android cross-compilation support to top-level Makefile

Makefile

-# Copyright 2011 the V8 project authors. All rights reserved.
+# 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
 #       with the distribution.
@@ skipping 14 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 ?=
+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 ($(library), shared)
   GYPFLAGS += -Dcomponent=shared_library
 endif
 ifdef component
   GYPFLAGS += -Dcomponent=$(component)
 endif
@@ skipping 40 matching lines @@
   TESTFLAGS += --no-presubmit
 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 (release mode)
 # - default (no target specified): build all DEFAULT_ARCHES and MODES
 # - "check": build all targets and run all tests
 # - "<arch>.clean" for any <arch> in ARCHES
 # - "clean": clean all ARCHES
 
 # ----------------- internal stuff ------------------------
 
 # Architectures and modes to be compiled. Consider these to be internal
 # variables, don't override them (use the targets instead).
 ARCHES = ia32 x64 arm mips
 DEFAULT_ARCHES = ia32 x64 arm
 MODES = release debug
 
 # List of files that trigger Makefile regeneration:
 GYPFILES = build/all.gyp build/common.gypi build/standalone.gypi \
            preparser/preparser.gyp samples/samples.gyp src/d8.gyp \
            test/cctest/cctest.gyp tools/gyp/v8.gyp
 
 # Generates all combinations of ARCHES and MODES, e.g. "ia32.release".
 BUILDS = $(foreach mode,$(MODES),$(addsuffix .$(mode),$(ARCHES)))
 # Generates corresponding test targets, e.g. "ia32.release.check".
 CHECKS = $(addsuffix .check,$(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))
+        $(addsuffix .check,$(MODES)) $(addsuffix .check,$(ARCHES)) \
+        must-set-ANDROID_NDK_ROOT
 
 # Target definitions. "all" is the default.
 all: $(MODES)
 
 # 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="$(LINK)" \
                  BUILDTYPE=$(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="$(LINK)" BUILDTYPE=Release \
                  builddir="$(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" \
+                LINK="$(ANDROID_TOOL_PREFIX)-g++" \
+                BUILDTYPE=Release \
+                builddir="$(shell pwd)/$(OUTDIR)/android.release"
+
 # Test targets.
 check: all
         @tools/test-wrapper-gypbuild.py $(TESTJOBS) --outdir=$(OUTDIR) \
             --arch=$(shell echo $(DEFAULT_ARCHES) | sed -e 's/ /,/g') \
             $(TESTFLAGS)
 
 $(addsuffix .check,$(MODES)): $$(basename $$@)
         @tools/test-wrapper-gypbuild.py $(TESTJOBS) --outdir=$(OUTDIR) \
             --mode=$(basename $@) $(TESTFLAGS)
 
@@ skipping 14 matching lines @@
         rm -f $(OUTDIR)/Makefile-$(basename $@)
         rm -rf $(OUTDIR)/$(basename $@).release
         rm -rf $(OUTDIR)/$(basename $@).debug
         find $(OUTDIR) -regex '.*\(host\|target\)-$(basename $@)\.mk' -delete
 
 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
 
 # GYP file generation targets.
 $(OUTDIR)/Makefile-ia32: $(GYPFILES) $(ENVFILE)
         build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
                       -Ibuild/standalone.gypi --depth=. -Dtarget_arch=ia32 \
                       -S-ia32 $(GYPFLAGS)
 
 $(OUTDIR)/Makefile-x64: $(GYPFILES) $(ENVFILE)
         build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
                       -Ibuild/standalone.gypi --depth=. -Dtarget_arch=x64 \
                       -S-x64 $(GYPFLAGS)
 
 $(OUTDIR)/Makefile-arm: $(GYPFILES) $(ENVFILE) build/armu.gypi
         build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
                       -Ibuild/standalone.gypi --depth=. -Ibuild/armu.gypi \
                       -S-arm $(GYPFLAGS)
 
 $(OUTDIR)/Makefile-mips: $(GYPFILES) $(ENVFILE) build/mipsu.gypi
         build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
                       -Ibuild/standalone.gypi --depth=. -Ibuild/mipsu.gypi \
                       -S-mips $(GYPFLAGS)
 
 $(OUTDIR)/Makefile-native: $(GYPFILES) $(ENVFILE)
         build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
                       -Ibuild/standalone.gypi --depth=. -S-native $(GYPFLAGS)
 
+$(OUTDIR)/Makefile-android: $(GYPFILES) $(ENVFILE) build/android.gypi \
+                            must-set-ANDROID_NDK_ROOT
+        CC="${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;
 
 # Dependencies.
 dependencies:
         svn checkout --force http://gyp.googlecode.com/svn/trunk build/gyp \
             --revision 1026