#!/usr/bin/make -f

# enable verbose build messages
export DH_VERBOSE=1

# enable all build hardening flags
export DEB_BUILD_MAINT_OPTIONS=hardening=+all

# disable lto flags, as they are for gcc, not clang
export DEB_BUILD_MAINT_OPTIONS+=optimize=-lto

# indicate that binary targets do not require root
export DEB_RULES_REQUIRES_ROOT=no

# compile with clang (gcc is currently not supported)
export AR=ar
export NM=nm
export CC=clang-16
export CXX=clang++-16

# initial flags from dpkg-buildflags
export DEB_CXXFLAGS_MAINT_STRIP=-g
export CXXFLAGS=$(shell dpkg-buildflags --get CXXFLAGS) -stdlib=libc++ -I/usr/lib/llvm-16/include/c++/v1
export LDFLAGS=$(shell dpkg-buildflags --get LDFLAGS) -stdlib=libc++ -Wl,-rpath,/usr/lib/llvm-16/lib

# more verbose linker output
export LDFLAGS+=-Wl,--stats

# extra flags to reduce warnings that aren't very useful
export CXXFLAGS+=-Wno-conversion \
                 -Wno-unused-function \
                 -Wno-unused-variable \
                 -Wno-unused-private-field \
                 -Wno-deprecated-declarations \
                 -Wno-unknown-pragmas \

# do not optimize away null pointer safety checks
export CXXFLAGS+=-fno-delete-null-pointer-checks

ifeq (ppc64el,$(DEB_HOST_ARCH))
# avoid altivec incompatibilities / deprecation warnings
export CXXFLAGS+=-faltivec-src-compat=mixed -Wno-deprecated-altivec-src-compat
endif

# disable clang plugins
defines=clang_use_chrome_plugins=false

# use system rust
export RUSTC_BOOTSTRAP=1
export CLANG_MVERS=$(shell $(CC) --version | sed -n 's/.* clang version //p' | cut -d. -f1)
rust_sysroot=/usr
defines+=rust_sysroot_absolute=\"$(rust_sysroot)\"
defines+=rust_bindgen_root=\"/usr\"
defines+=rustc_version=\"$(shell $(rust_sysroot)/bin/rustc --version)\"
defines+=clang_base_path=\"/usr/lib/llvm-$(CLANG_MVERS)\"
defines+=clang_version=\"$(CLANG_MVERS)\"

# build using system toolchain
defines+=host_toolchain=\"//build/toolchain/linux/unbundle:default\"
defines+=custom_toolchain=\"//build/toolchain/linux/unbundle:default\"

# set the appropriate cpu architecture
DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)
ifeq (i386,$(DEB_HOST_ARCH))
defines+=host_cpu=\"x86\" use_vaapi=true
endif
ifeq (amd64,$(DEB_HOST_ARCH))
defines+=host_cpu=\"x64\" use_vaapi=true
endif
ifeq (arm64,$(DEB_HOST_ARCH))
defines+=host_cpu=\"arm64\" use_v4l2_codec=true use_vaapi=false
endif
ifeq (armhf,$(DEB_HOST_ARCH))
defines+=host_cpu=\"arm\" use_v4l2_codec=true use_vaapi=false arm_use_neon=true
endif

# thin lto requires >4 GB RAM, so avoid it on 32-bit architectures
ifeq ($(filter armhf i386,$(DEB_HOST_ARCH)),)
defines+=use_thin_lto=true
else
defines+=use_thin_lto=false \
         concurrent_links=1
endif

# disabled features
defines+=is_debug=false \
         use_sysroot=false \
         use_libjpeg_turbo=true \
         use_custom_libcxx=false \
         use_unofficial_version_number=false \
         safe_browsing_use_unrar=false \
         enable_vr=false \
         enable_nacl=false \
         enable_swiftshader=false \
         dawn_use_swiftshader=false \
         build_dawn_tests=false \
         enable_reading_list=false \
         enable_iterator_debugging=false \
         enable_hangout_services_extension=false \
         angle_has_histograms=false \
         angle_build_tests=false \
         build_angle_perftests=false \
         treat_warnings_as_errors=false \
         use_qt=false \
         is_cfi=false \
         chrome_pgo_phase=0 \

# enabled features
defines+=use_gio=true \
         is_official_build=true \
         symbol_level=0 \
         use_pulseaudio=true \
         link_pulseaudio=true \
         rtc_use_pipewire=true \
         icu_use_data_file=true \
         enable_widevine=true \
         v8_enable_backtrace=true \
         use_system_zlib=true \
         use_system_lcms2=true \
         use_system_libjpeg=true \
         use_system_libpng=true \
         use_system_freetype=true \
         use_system_harfbuzz=true \
         use_system_libopenjpeg2=true \
         proprietary_codecs=true \
         ffmpeg_branding=\"Chrome\" \
         disable_fieldtrial_testing_config=true \

# handle parallel build options
njobs=1
ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
njobs=$(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
endif

DIST := $(shell dpkg-parsechangelog -l debian/changelog  | sed -n 's/^Distribution: //p')

%:
	dh $@


# don't build armhf on build systems that lack NEON
test_armhf_neon:
	uname -m
	if [ `uname -m` = "armv7l" ]; then \
		grep -q 'neon\|asimd' /proc/cpuinfo || { \
			echo "No NEON extension detected on armhf, refusing to build" 1>&2; \
			false; \
		}; \
	fi

override_dh_auto_configure: test_armhf_neon
	# verify that we're not accidentally uploading to stable-security without CVEs
	@echo "$(DIST)" | grep -q -- '-security' && { \
		dpkg-parsechangelog -l debian/changelog | grep -q 'CVE-' || { \
			echo "ERROR: security upload with no CVEs listed. You should fix that."; \
			exit 1; \
		} \
	} || true
	# use system node w/out patching source; upstream hardcodes x64 in path
	mkdir -p third_party/node/linux/node-linux-x64/bin
	cp /usr/bin/node third_party/node/linux/node-linux-x64/bin
	# use system rollup
	cp -ra /usr/share/nodejs/rollup third_party/node/node_modules/
	# output compiler information
	$(CXX) --version
	# prefer unbundled (system) libraries
	./debian/scripts/unbundle

override_dh_auto_build-arch:
	gn gen out/Release --args="$(defines)"
	ninja -j$(njobs) -C out/Release chrome chrome_sandbox content_shell chromedriver
	cp out/Release/chrome out/Release/chromium
	cp out/Release/content_shell out/Release/chromium-shell
	cp out/Release/chrome_sandbox out/Release/chrome-sandbox
	cp out/Release/locales/en-US.pak out/Release/resources
	chmod 4755 out/Release/chrome-sandbox # suid sandbox
	sed -e s/@@PACKAGE@@/chromium/g -e s/@@MENUNAME@@/chromium/g \
	    < chrome/app/resources/manpage.1.in > out/Release/chromium.1

override_dh_auto_build-indep:
	gn gen out/Release --args="$(defines)"
	ninja -j$(njobs) -C out/Release packed_resources
	rm -f out/Release/locales/en-US.pak

override_dh_auto_install-arch:
	dh_auto_install
	# update launcher script with build information
	sed 's|@BUILD_DIST@|$(shell . /etc/os-release && echo "$$PRETTY_NAME")|' \
	    < debian/scripts/chromium > debian/chromium/usr/bin/chromium
	# move icons into /usr/share
	./debian/scripts/icons

override_dh_fixperms:
	dh_fixperms --exclude chrome-sandbox

override_dh_auto_clean:
	rm -rf third_party/node/linux/node-linux-x64
	rm -rf out
	rm -rf third_party/node/node_modules/rollup
	# bullseye workarounds; delete this post-bullseye
	rm -rf third_party/node/node_modules/acorn
	rm -rf third_party/node/node_modules/walk
	find . -name \*.pyc -execdir rm -f {} \;
	dh_auto_clean

###################### upstream source downloading ############################

url=https://gsdview.appspot.com/chromium-browser-official
version=$(shell dpkg-parsechangelog -S Version | sed s/-.*//)
extract=chromium-$(version)
tarfile=$(extract).tar
tarball=$(tarfile).xz
debvers=../chromium_$(version)
seconds=$(debvers).seconds
origtxz=$(debvers).orig.tar.xz
removed=$(debvers).files-removed
options=--sort=name --owner=0 --group=0 --numeric-owner --mtime="@$$(stat --format "%Y" ../$(tarball))" --clamp-mtime

get-orig-source:
	wget -nv --show-progress -c $(url)/$(tarball) -O ../$(tarball)
	@date +%s > $(seconds)
	# TODO: use `grep-dctrl -F Files-Excluded '' -s Files-Excluded debian/copyright` instead (from jochensp)
	perl debian/scripts/get-excludes.pl "`tar tf ../$(tarball) | head -n1`" > $(debvers).excludes
	@echo $$(($$(date +%s) - $$(cat $(seconds)))) seconds
	@echo
	test ! -e $(extract) || rm -rf $(extract)
	tar --exclude-from=$(debvers).excludes -xf ../$(tarball)
	@echo $$(($$(date +%s) - $$(cat $(seconds)))) seconds
	@echo
	rm -f $(debvers).excludes
	cd $(extract) && ../debian/scripts/check-upstream
	@echo $$(($$(date +%s) - $$(cat $(seconds)))) seconds
	@echo
	test ! -e $(origtxz) || rm -f $(origtxz)
	tar $(options) -cf - $(extract) | xz -6 -T0 - > $(origtxz)
	@echo $$(($$(date +%s) - $$(cat $(seconds)))) seconds
	@echo
	rm -rf $(extract)
	@echo $$(($$(date +%s) - $$(cat $(seconds)))) seconds | tee seconds
	@mv -f seconds $(seconds)