Make GYP build usable for day-to-day work (second attempt)

Makefile

+# Copyright 2011 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.
+#     * Neither the name of Google Inc. nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# 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++"  # For distcc: export CXX="distcc g++"
+LINK ?= "g++"
+OUTDIR ?= out
+TESTJOBS ?= -j16
+GYPFLAGS ?= -Dv8_can_use_vfp_instructions=true
+
+# Architectures and modes to be compiled.
+ARCHES = ia32 x64 arm
+MODES = release debug
+
+# List of files that trigger Makefile regeneration:
+GYPFILES = build/all.gyp build/common.gypi build/v8-features.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)))
+CHECKS = $(addsuffix .check,$(BUILDS))
+# Generates corresponding test targets, e.g. "ia32.release.check".
+
+.PHONY: all release debug ia32 x64 arm $(BUILDS)
+
+# Target definitions. "all" is the default, you can specify any others on the
+# command line, e.g. "make ia32". Targets defined in $(BUILDS), e.g.
+# "ia32.debug", can also be specified.
+all: release debug
+
+release: $(addsuffix .release,$(ARCHES))
+
+debug: $(addsuffix .debug,$(ARCHES))
+
+ia32: $(addprefix ia32.,$(MODES))
+
+x64: $(addprefix x64.,$(MODES))
+
+arm: $(addprefix arm.,$(MODES))
+
+.SECONDEXPANSION:
+$(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)/$(OUTDIR)/$@"
+
+# Test targets.
+check: all
+        @tools/test-wrapper-gypbuild.py $(TESTJOBS)
+
+debug.check: debug
+        @tools/test-wrapper-gypbuild.py $(TESTJOBS) --mode=debug
+
+release.check: release
+        @tools/test-wrapper-gypbuild.py $(TESTJOBS) --mode=release
+
+$(addsuffix .check,$(ARCHES)): $$(basename $$@)
+        @tools/test-wrapper-gypbuild.py $(TESTJOBS) --arch=$(basename $@)
+
+$(CHECKS): $$(basename $$@)
+        @tools/test-wrapper-gypbuild.py $(TESTJOBS) --arch-and-mode=$(basename $@)
+
+# Clean targets. You can clean each architecture individually, or everything.
+$(addsuffix .clean,$(ARCHES)):
+        rm -f $(OUTDIR)/Makefile-$(basename $@)
+        rm -rf $(OUTDIR)/$(basename $@).release
+        rm -rf $(OUTDIR)/$(basename $@).debug
+
+clean: $(addsuffix .clean,$(ARCHES))
+
+# GYP file generation targets.
+$(OUTDIR)/Makefile-ia32: $(GYPFILES)
+        build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
+                      -Ibuild/common.gypi --depth=. -Dtarget_arch=ia32 -S-ia32 \
+                      $(GYPFLAGS)
+
+$(OUTDIR)/Makefile-x64: $(GYPFILES)
+        build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
+                      -Ibuild/common.gypi --depth=. -Dtarget_arch=x64 -S-x64 \
+                      $(GYPFLAGS)
+
+$(OUTDIR)/Makefile-arm: $(GYPFILES) build/armu.gypi
+        build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
+                      -Ibuild/common.gypi --depth=. -Ibuild/armu.gypi -S-arm \
+                      $(GYPFLAGS)