.PHONY: v8 all

ARCH := $(shell uname -m)
ifeq ($(ARCH),aarch64)
	LLVM := https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.1/clang+llvm-13.0.1-aarch64-linux-gnu.tar.xz
	LLVM_BINPATH := $(shell pwd)/build/clang+llvm-13.0.1-aarch64-linux-gnu
	ARCH := arm64
endif
ifeq ($(ARCH),x86_64)
	LLVM := https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.1/clang+llvm-13.0.1-x86_64-linux-gnu-ubuntu-18.04.tar.xz
	LLVM_BINPATH := $(shell pwd)/build/clang+llvm-13.0.1-x86_64-linux-gnu-ubuntu-18.04
	ARCH := x64
endif

GN_ARGS = is_component_build=false v8_use_external_startup_data=false v8_enable_i18n_support=false clang_base_path=\"$(LLVM_BINPATH)\" clang_use_chrome_plugins=false use_custom_libcxx=false treat_warnings_as_errors=false use_lld=false v8_monolithic=true


build/gn/out/gn:
	@echo "Setting up build directory"
	@mkdir -p build
	@echo "Downloading LLVM"
	@wget -q -O build/llvm.tar.xz $(LLVM)
	@cd build && tar -Jxf llvm.tar.xz
	@echo "Downloading gn source"
	@git clone -q https://gn.googlesource.com/gn.git build/gn
	@cd build/gn && git checkout -q eea3906f0e2a8d3622080127d2005ff214d51383
	@echo "Building gn"
	cd build/gn && export PATH="${PATH}":$(LLVM_BINPATH)/bin && python3 build/gen.py && ninja -C out/ gn

build/v8: build/gn/out/gn
	@echo "Downloading v8 source"
	@git clone -q https://github.com/v8/v8 build/v8
	@cd build/v8 && git checkout -q 9.7.37
	@echo "Patching v8 code"
	@cd build/v8 && (git apply ../../patches/code/*.patch || true)
	@echo "Downloading up third party sources"
	@git clone -q https://chromium.googlesource.com/chromium/src/base/trace_event/common.git build/v8/base/trace_event/common
	@cd build/v8/base/trace_event/common && git checkout -q 3da1e2fcf66acd5c7194497b4285ac163f32e239
	@git clone -q https://chromium.googlesource.com/chromium/src/build.git build/v8/build
	@cd build/v8/build && git checkout -q bbf7f0ed65548c4df862d2a2748e3a9b908a3217
	@git clone -q https://chromium.googlesource.com/external/github.com/google/googletest.git build/v8/third_party/googletest/src
	@cd build/v8/third_party/googletest/src && git checkout -q 47f819c3ca54fb602f432904443e00a0a1fe2f42
	@git clone -q https://chromium.googlesource.com/chromium/deps/icu.git build/v8/third_party/icu
	@cd build/v8/third_party/icu && git checkout -q 75e34bcccea0be165c31fdb278b3712c516c5876
	@git clone -q https://chromium.googlesource.com/chromium/src/third_party/jinja2.git build/v8/third_party/jinja2
	@cd build/v8/third_party/jinja2 && git checkout -q ee69aa00ee8536f61db6a451f3858745cf587de6
	@git clone -q https://chromium.googlesource.com/chromium/src/third_party/markupsafe.git build/v8/third_party/markupsafe
	@cd build/v8/third_party/markupsafe && git checkout -q 1b882ef6372b58bfd55a3285f37ed801be9137cd
	@git clone -q https://chromium.googlesource.com/chromium/src/third_party/zlib.git build/v8/third_party/zlib
	@cd build/v8/third_party/zlib && git checkout -q 563140dd9c24f84bf40919196e9e7666d351cc0d
	@cp Makefiles/gclient_args.gni build/v8/build/config/gclient_args.gni
	@echo "Setting up sysroot"
	@cd build/v8 && python3 build/linux/sysroot_scripts/install-sysroot.py --arch=$(ARCH)
	@echo "Generating v8 configuration"
	@cd build/v8 && ../gn/out/gn gen out.gn --args="$(GN_ARGS)"
	@echo "Patching v8 build configuration"
	@cd build/v8 && (git apply ../../patches/build/*.patch || true)
	@echo "Building v8"
	@cd build/v8 && export PATH="${PATH}":$(LLVM_BINPATH)/bin && ninja -C ./out.gn v8_monolith

libv8_monolith.a: build/v8

v8: libv8_monolith.a

all: v8