v8/Makefile
joransiu 1091c2f07e S390: Makefile + Build Toolchain Updates
This is the first of several commits to contribute Linux on z Systems
(s390/s390x) port of V8.  We will be breaking up the changes into several
(hopefully) logical commits.

This commit contains the changes to V8 Makefile and build toolchains to
introduce S390 macros and compiler options.  Just for awareness for reviewers
is that s390 is 31-bit (not 32!) big-endian platform on Linux on z.  (MSB of address
is used to distinguish between 24-bit vs 31-bit addressing!)  s390x is
64-bit Linux on z.  Names follow the general linux convention on the platform.

A quick roadmap on upcoming commits:
- Add \#include of S390 header files in common files
- S390 related tests + tooling changes
- printf macro for printing size_t values.
- S390 platform-specific code generation code (bulk of changes!)

R=danno@chromium.org,svenpanne@chromium.org,michael_dawson@ca.ibm.com,jyan@ca.ibm.com,mtbrandyberry@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1585813002

Cr-Commit-Position: refs/heads/master@{#33304}
2016-01-14 17:17:11 +00:00

501 lines
17 KiB
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
# 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.
OUTDIR ?= out
TESTJOBS ?=
GYPFLAGS ?=
TESTFLAGS ?=
ANDROID_NDK_HOST_ARCH ?=
ANDROID_V8 ?= /data/local/tmp/v8
NACL_SDK_ROOT ?=
# 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
# disassembler=on
ifeq ($(disassembler), on)
GYPFLAGS += -Dv8_enable_disassembler=1
endif
# objectprint=on
ifeq ($(objectprint), on)
GYPFLAGS += -Dv8_object_print=1
endif
# verifyheap=on
ifeq ($(verifyheap), on)
GYPFLAGS += -Dv8_enable_verify_heap=1
endif
# tracemaps=on
ifeq ($(tracemaps), on)
GYPFLAGS += -Dv8_trace_maps=1
endif
# backtrace=off
ifeq ($(backtrace), off)
GYPFLAGS += -Dv8_enable_backtrace=0
else
GYPFLAGS += -Dv8_enable_backtrace=1
endif
# verifypredictable=on
ifeq ($(verifypredictable), on)
GYPFLAGS += -Dv8_enable_verify_predictable=1
endif
# snapshot=off
ifeq ($(snapshot), off)
GYPFLAGS += -Dv8_use_snapshot='false'
endif
ifeq ($(snapshot), external)
GYPFLAGS += -Dv8_use_external_startup_data=1
endif
# extrachecks=on/off
ifeq ($(extrachecks), on)
GYPFLAGS += -Ddcheck_always_on=1 -Dv8_enable_handle_zapping=1
endif
ifeq ($(extrachecks), off)
GYPFLAGS += -Ddcheck_always_on=0 -Dv8_enable_handle_zapping=0
endif
# slowdchecks=on/off
ifeq ($(slowdchecks), on)
GYPFLAGS += -Dv8_enable_slow_dchecks=1
endif
ifeq ($(slowdchecks), off)
GYPFLAGS += -Dv8_enable_slow_dchecks=0
endif
# debugsymbols=on
ifeq ($(debugsymbols), on)
GYPFLAGS += -Drelease_extra_cflags=-ggdb3
endif
# gdbjit=on/off
ifeq ($(gdbjit), on)
GYPFLAGS += -Dv8_enable_gdbjit=1
endif
ifeq ($(gdbjit), off)
GYPFLAGS += -Dv8_enable_gdbjit=0
endif
# vtunejit=on
ifeq ($(vtunejit), on)
GYPFLAGS += -Dv8_enable_vtunejit=1
endif
# unalignedaccess=on
ifeq ($(unalignedaccess), on)
GYPFLAGS += -Dv8_can_use_unaligned_accesses=true
endif
# randomseed=12345, disable random seed via randomseed=0
ifdef randomseed
GYPFLAGS += -Dv8_random_seed=$(randomseed)
endif
# soname_version=1.2.3
ifdef soname_version
GYPFLAGS += -Dsoname_version=$(soname_version)
endif
# werror=no
ifeq ($(werror), no)
GYPFLAGS += -Dwerror=''
endif
# presubmit=no
ifeq ($(presubmit), no)
TESTFLAGS += --no-presubmit
endif
# strictaliasing=off (workaround for GCC-4.5)
ifeq ($(strictaliasing), off)
GYPFLAGS += -Dv8_no_strict_aliasing=1
endif
# regexp=interpreted
ifeq ($(regexp), interpreted)
GYPFLAGS += -Dv8_interpreted_regexp=1
endif
# i18nsupport=off
ifeq ($(i18nsupport), off)
GYPFLAGS += -Dv8_enable_i18n_support=0
TESTFLAGS += --noi18n
endif
# deprecationwarnings=on
ifeq ($(deprecationwarnings), on)
GYPFLAGS += -Dv8_deprecation_warnings=1
endif
# vectorstores=on
ifeq ($(vectorstores), on)
GYPFLAGS += -Dv8_vector_stores=1
endif
# imminentdeprecationwarnings=on
ifeq ($(imminentdeprecationwarnings), on)
GYPFLAGS += -Dv8_imminent_deprecation_warnings=1
endif
# asan=on
ifeq ($(asan), on)
GYPFLAGS += -Dasan=1 -Dclang=1
TESTFLAGS += --asan
ifeq ($(lsan), on)
GYPFLAGS += -Dlsan=1
endif
endif
ifdef embedscript
GYPFLAGS += -Dembed_script=$(embedscript)
endif
ifeq ($(goma), on)
GYPFLAGS += -Duse_goma=1
endif
# arm specific flags.
# arm_version=<number | "default">
ifneq ($(strip $(arm_version)),)
GYPFLAGS += -Darm_version=$(arm_version)
else
# Deprecated (use arm_version instead): armv7=false/true
ifeq ($(armv7), false)
GYPFLAGS += -Darm_version=6
else
ifeq ($(armv7), true)
GYPFLAGS += -Darm_version=7
endif
endif
endif
# hardfp=on/off. Deprecated, use armfloatabi
ifeq ($(hardfp),on)
GYPFLAGS += -Darm_float_abi=hard
else
ifeq ($(hardfp),off)
GYPFLAGS += -Darm_float_abi=softfp
endif
endif
# fpu: armfpu=xxx
# xxx: vfp, vfpv3-d16, vfpv3, neon.
ifeq ($(armfpu),)
GYPFLAGS += -Darm_fpu=default
else
GYPFLAGS += -Darm_fpu=$(armfpu)
endif
# float abi: armfloatabi=softfp/hard
ifeq ($(armfloatabi),)
ifeq ($(hardfp),)
GYPFLAGS += -Darm_float_abi=default
endif
else
GYPFLAGS += -Darm_float_abi=$(armfloatabi)
endif
# armthumb=on/off
ifeq ($(armthumb), off)
GYPFLAGS += -Darm_thumb=0
else
ifeq ($(armthumb), on)
GYPFLAGS += -Darm_thumb=1
endif
endif
# arm_test_noprobe=on
# With this flag set, by default v8 will only use features implied
# by the compiler (no probe). This is done by modifying the default
# values of enable_armv7, enable_vfp3, enable_32dregs and enable_neon.
# Modifying these flags when launching v8 will enable the probing for
# the specified values.
ifeq ($(arm_test_noprobe), on)
GYPFLAGS += -Darm_test_noprobe=on
endif
# ----------------- available targets: --------------------
# - "grokdump": rebuilds heap constants lists used by grokdump
# - 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
# - "nacl" : cross-compile for Native Client (ia32 and x64)
# - 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 x32 arm arm64 mips mipsel mips64 mips64el x87 ppc ppc64 \
s390 s390x
DEFAULT_ARCHES = ia32 x64 arm
MODES = release debug optdebug
DEFAULT_MODES = release debug
ANDROID_ARCHES = android_ia32 android_x64 android_arm android_arm64 \
android_mipsel android_x87
NACL_ARCHES = nacl_ia32 nacl_x64
# List of files that trigger Makefile regeneration:
GYPFILES = third_party/icu/icu.gypi third_party/icu/icu.gyp \
build/shim_headers.gypi build/features.gypi build/standalone.gypi \
build/toolchain.gypi build/all.gyp build/mac/asan.gyp \
test/cctest/cctest.gyp \
test/unittests/unittests.gyp tools/gyp/v8.gyp \
tools/parser-shell.gyp testing/gmock.gyp testing/gtest.gyp \
buildtools/third_party/libc++abi/libc++abi.gyp \
buildtools/third_party/libc++/libc++.gyp samples/samples.gyp \
src/third_party/vtune/v8vtune.gyp src/d8.gyp
# If vtunejit=on, the v8vtune.gyp will be appended.
ifeq ($(vtunejit), on)
GYPFILES += src/third_party/vtune/v8vtune.gyp
endif
# Generates all combinations of ARCHES and MODES, e.g. "ia32.release".
BUILDS = $(foreach mode,$(MODES),$(addsuffix .$(mode),$(ARCHES)))
ANDROID_BUILDS = $(foreach mode,$(MODES), \
$(addsuffix .$(mode),$(ANDROID_ARCHES)))
NACL_BUILDS = $(foreach mode,$(MODES), \
$(addsuffix .$(mode),$(NACL_ARCHES)))
# Generates corresponding test targets, e.g. "ia32.release.check".
CHECKS = $(addsuffix .check,$(BUILDS))
QUICKCHECKS = $(addsuffix .quickcheck,$(BUILDS))
ANDROID_CHECKS = $(addsuffix .check,$(ANDROID_BUILDS))
NACL_CHECKS = $(addsuffix .check,$(NACL_BUILDS))
# File where previously used GYPFLAGS are stored.
ENVFILE = $(OUTDIR)/environment
.PHONY: all check clean builddeps dependencies $(ENVFILE).new native \
qc quickcheck $(QUICKCHECKS) turbocheck \
$(addsuffix .quickcheck,$(MODES)) $(addsuffix .quickcheck,$(ARCHES)) \
$(ARCHES) $(MODES) $(BUILDS) $(CHECKS) $(addsuffix .clean,$(ARCHES)) \
$(addsuffix .check,$(MODES)) $(addsuffix .check,$(ARCHES)) \
$(ANDROID_ARCHES) $(ANDROID_BUILDS) $(ANDROID_CHECKS) \
$(NACL_ARCHES) $(NACL_BUILDS) $(NACL_CHECKS) \
must-set-NACL_SDK_ROOT
# Target definitions. "all" is the default.
all: $(DEFAULT_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 .$$@,$(DEFAULT_ARCHES))
$(ARCHES): $(addprefix $$@.,$(DEFAULT_MODES))
# Defines how to build a particular target (e.g. ia32.release).
$(BUILDS): $(OUTDIR)/Makefile.$$@
@$(MAKE) -C "$(OUTDIR)" -f Makefile.$@ \
BUILDTYPE=$(shell echo $(subst .,,$(suffix $@)) | \
python -c "print \
raw_input().replace('opt', '').capitalize()") \
builddir="$(shell pwd)/$(OUTDIR)/$@"
native: $(OUTDIR)/Makefile.native
@$(MAKE) -C "$(OUTDIR)" -f Makefile.native \
BUILDTYPE=Release \
builddir="$(shell pwd)/$(OUTDIR)/$@"
$(ANDROID_ARCHES): $(addprefix $$@.,$(MODES))
$(ANDROID_BUILDS): $(GYPFILES) $(ENVFILE) Makefile.android
@$(MAKE) -f Makefile.android $@ \
ARCH="$(basename $@)" \
MODE="$(subst .,,$(suffix $@))" \
OUTDIR="$(OUTDIR)" \
GYPFLAGS="$(GYPFLAGS)"
$(NACL_ARCHES): $(addprefix $$@.,$(MODES))
$(NACL_BUILDS): $(GYPFILES) $(ENVFILE) \
Makefile.nacl must-set-NACL_SDK_ROOT
@$(MAKE) -f Makefile.nacl $@ \
ARCH="$(basename $@)" \
MODE="$(subst .,,$(suffix $@))" \
OUTDIR="$(OUTDIR)" \
GYPFLAGS="$(GYPFLAGS)"
# Test targets.
check: all
@tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--arch=$(shell echo $(DEFAULT_ARCHES) | sed -e 's/ /,/g') \
$(TESTFLAGS)
$(addsuffix .check,$(MODES)): $$(basename $$@)
@tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--mode=$(basename $@) $(TESTFLAGS)
$(addsuffix .check,$(ARCHES)): $$(basename $$@)
@tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--arch=$(basename $@) $(TESTFLAGS)
$(CHECKS): $$(basename $$@)
@tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--arch-and-mode=$(basename $@) $(TESTFLAGS)
$(addsuffix .quickcheck,$(MODES)): $$(basename $$@)
@tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--mode=$(basename $@) $(TESTFLAGS) --quickcheck
$(addsuffix .quickcheck,$(ARCHES)): $$(basename $$@)
@tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--arch=$(basename $@) $(TESTFLAGS) --quickcheck
$(QUICKCHECKS): $$(basename $$@)
@tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--arch-and-mode=$(basename $@) $(TESTFLAGS) --quickcheck
$(addsuffix .sync, $(ANDROID_BUILDS)): $$(basename $$@)
@tools/android-sync.sh $(basename $@) $(OUTDIR) \
$(shell pwd) $(ANDROID_V8)
$(addsuffix .check, $(ANDROID_BUILDS)): $$(basename $$@).sync
@tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--arch-and-mode=$(basename $@) \
--timeout=600 \
--command-prefix="tools/android-run.py" $(TESTFLAGS)
$(addsuffix .check, $(ANDROID_ARCHES)): \
$(addprefix $$(basename $$@).,$(MODES)).check
$(addsuffix .check, $(NACL_BUILDS)): $$(basename $$@)
@tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--arch-and-mode=$(basename $@) \
--timeout=600 --nopresubmit --noi18n \
--command-prefix="tools/nacl-run.py"
$(addsuffix .check, $(NACL_ARCHES)): \
$(addprefix $$(basename $$@).,$(MODES)).check
native.check: native
@tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR)/native \
--arch-and-mode=. $(TESTFLAGS)
SUPERFASTTESTMODES = ia32.release
FASTTESTMODES = $(SUPERFASTTESTMODES),x64.release,ia32.optdebug,x64.optdebug,arm.optdebug,arm64.release
FASTCOMPILEMODES = $(FASTTESTMODES),arm64.optdebug
COMMA = ,
EMPTY =
SPACE = $(EMPTY) $(EMPTY)
quickcheck: $(subst $(COMMA),$(SPACE),$(FASTCOMPILEMODES))
tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--arch-and-mode=$(SUPERFASTTESTMODES) $(TESTFLAGS) --quickcheck \
--download-data mozilla webkit
tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--arch-and-mode=$(FASTTESTMODES) $(TESTFLAGS) --quickcheck
qc: quickcheck
turbocheck: $(subst $(COMMA),$(SPACE),$(FASTCOMPILEMODES))
tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--arch-and-mode=$(SUPERFASTTESTMODES) $(TESTFLAGS) \
--quickcheck --variants=turbofan --download-data mozilla webkit
tools/run-tests.py $(TESTJOBS) --outdir=$(OUTDIR) \
--arch-and-mode=$(FASTTESTMODES) $(TESTFLAGS) \
--quickcheck --variants=turbofan
tc: turbocheck
# Clean targets. You can clean each architecture individually, or everything.
$(addsuffix .clean, $(ARCHES) $(ANDROID_ARCHES) $(NACL_ARCHES)):
rm -f $(OUTDIR)/Makefile.$(basename $@)*
rm -rf $(OUTDIR)/$(basename $@).release
rm -rf $(OUTDIR)/$(basename $@).debug
rm -rf $(OUTDIR)/$(basename $@).optdebug
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
clean: $(addsuffix .clean, $(ARCHES) $(ANDROID_ARCHES) $(NACL_ARCHES)) native.clean gtags.clean
# GYP file generation targets.
OUT_MAKEFILES = $(addprefix $(OUTDIR)/Makefile.,$(BUILDS))
$(OUT_MAKEFILES): $(GYPFILES) $(ENVFILE)
$(eval CXX_TARGET_ARCH:=$(shell $(CXX) -v 2>&1 | grep ^Target: | \
cut -f 2 -d " " | cut -f 1 -d "-" ))
$(eval CXX_TARGET_ARCH:=$(subst aarch64,arm64,$(CXX_TARGET_ARCH)))
$(eval CXX_TARGET_ARCH:=$(subst x86_64,x64,$(CXX_TARGET_ARCH)))
$(eval V8_TARGET_ARCH:=$(subst .,,$(suffix $(basename $@))))
PYTHONPATH="$(shell pwd)/tools/generate_shim_headers:$(shell pwd)/build:$(PYTHONPATH):$(shell pwd)/build/gyp/pylib:$(PYTHONPATH)" \
GYP_GENERATORS=make \
build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
-Ibuild/standalone.gypi --depth=. \
-Dv8_target_arch=$(V8_TARGET_ARCH) \
$(if $(findstring $(CXX_TARGET_ARCH),$(V8_TARGET_ARCH)), \
-Dtarget_arch=$(V8_TARGET_ARCH),) \
$(if $(findstring optdebug,$@),-Dv8_optimized_debug=1,) \
-S$(suffix $(basename $@))$(suffix $@) $(GYPFLAGS)
$(OUTDIR)/Makefile.native: $(GYPFILES) $(ENVFILE)
PYTHONPATH="$(shell pwd)/tools/generate_shim_headers:$(shell pwd)/build:$(PYTHONPATH):$(shell pwd)/build/gyp/pylib:$(PYTHONPATH)" \
GYP_GENERATORS=make \
build/gyp/gyp --generator-output="$(OUTDIR)" build/all.gyp \
-Ibuild/standalone.gypi --depth=. -S.native $(GYPFLAGS)
# Note that NACL_SDK_ROOT must be set to point to an appropriate
# Native Client SDK before using this makefile. You can download
# an SDK here:
# https://developers.google.com/native-client/sdk/download
# The path indicated by NACL_SDK_ROOT will typically end with
# a folder for a pepper version such as "pepper_25" that should
# have "tools" and "toolchain" subdirectories.
must-set-NACL_SDK_ROOT:
ifndef NACL_SDK_ROOT
$(error NACL_SDK_ROOT must be 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:
$(eval CXX_TARGET_ARCH:=$(shell $(CXX) -v 2>&1 | grep ^Target: | \
cut -f 2 -d " " | cut -f 1 -d "-" ))
$(eval CXX_TARGET_ARCH:=$(subst aarch64,arm64,$(CXX_TARGET_ARCH)))
$(eval CXX_TARGET_ARCH:=$(subst x86_64,x64,$(CXX_TARGET_ARCH)))
@mkdir -p $(OUTDIR); echo "GYPFLAGS=$(GYPFLAGS) -Dtarget_arch=$(CXX_TARGET_ARCH)" > $(ENVFILE).new;
# Heap constants for grokdump.
DUMP_FILE = tools/v8heapconst.py
grokdump: ia32.release
@cat $(DUMP_FILE).tmpl > $(DUMP_FILE)
@$(OUTDIR)/ia32.release/d8 --dump-heap-constants >> $(DUMP_FILE)
# Support for the GNU GLOBAL Source Code Tag System.
gtags.files: $(GYPFILES) $(ENVFILE)
@find include src test -name '*.h' -o -name '*.cc' -o -name '*.c' > $@
# We need to manually set the stack limit here, to work around bugs in
# gmake-3.81 and global-5.7.1 on recent 64-bit Linux systems.
GPATH GRTAGS GSYMS GTAGS: gtags.files $(shell cat gtags.files 2> /dev/null)
@bash -c 'ulimit -s 10240 && GTAGSFORCECPP=yes gtags -i -q -f $<'
gtags.clean:
rm -f gtags.files GPATH GRTAGS GSYMS GTAGS
dependencies builddeps:
$(error Use 'gclient sync' instead)