# Copyright 2009-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

# Use following environment variables to customise the build
# EXTRA_GN — pass extra options to gn
# NINJAOPTS="-k0 -j8" useful to populate ccache even if ebuild is still failing
# UGC_SKIP_PATCHES — space-separated list of patches to skip
# UGC_KEEP_BINARIES — space-separated list of binaries to keep
# UGC_SKIP_SUBSTITUTION — space-separated list of files to skip domain substitution

# USE=bundled-toolchain is intended for users who want to use the same toolchain
# as the upstream releases. It's also a good fallback in case we fall behind
# and need to get a release out quickly (less likely with `dev` in-tree).
# We can't rely on it as a default since the toolchain is only shipped for x86-64;
# other architectures will need to use system toolchain.

# Since m133 we are using CI-generated tarballs from
# https://github.com/chromium-linux-tarballs/chromium-tarballs/

# These are bit-for-bit identical to the official releases, but are built
# using an external CI system that we have some control over, in case
# issues pop up again with official tarball generation.

GN_MIN_VER=0.2354
# chromium-tools/get-chromium-toolchain-strings.py (or just use Chromicler)
# Node for M145+ should be 24.12.0 but that's not packaged in Gentoo yet. See #969145
TEST_FONT="a28b222b79851716f8358d2800157d9ffe117b3545031ae51f69b7e1e1b9a969"
BUNDLED_CLANG_VER="llvmorg-23-init-5669-g8a0be0bc-4"
BUNDLED_RUST_VER="6f54d591c3116ee7f8ce9321ddeca286810cc142-7"
RUST_SHORT_HASH=${BUNDLED_RUST_VER:0:10}-${BUNDLED_RUST_VER##*-}
NODE_VER="24.12.0"
ESBUILD_VER="0.25.1"
ROLLUP_VER="4.57.1" # currently manual.
VIRTUALX_REQUIRED="pgo"

CHROMIUM_LANGS="af am ar as az be bg bn bs ca cs cy da de el en-GB es es-419 et eu fa fi fil
	fr fr-CA gl gu he hi hr hu hy id is it ja ka kk km kn ko ky lo lt lv mk ml mn mr ms my
	nb ne nl or pa pl pt-BR pt-PT ro ru si sk sl sq sr sr-Latn sv sw ta te th tr uk ur uz
	vi zh-CN zh-HK zh-TW zu"

LLVM_COMPAT=( 21 22 23 )
PYTHON_COMPAT=( python3_{11..13} )
PYTHON_REQ_USE="xml(+)"
RUST_MIN_VER=1.91.0
RUST_NEEDS_LLVM="yes please"
RUST_OPTIONAL="yes" # Not actually optional, but we don't need system Rust (or LLVM) with USE=bundled-toolchain
RUST_REQ_USE="rustfmt" # Upstream run rustfmt on bindgen output, so we need it to be available.

inherit check-reqs chromium-2 desktop flag-o-matic llvm-r1 multiprocessing ninja-utils pax-utils
inherit python-any-r1 readme.gentoo-r1 rust systemd toolchain-funcs xdg-utils

CROMITE_COMMIT_ID="15d48b061426a1f4a8ae8596622f0599ca626056"
# CROMITE_PR_COMMITS=(
# 	8a749421011cf10f461bdd5619a0bfda6a4ae0f7
# )

DESCRIPTION="Cromite a Bromite fork with ad blocking and privacy enhancements; take back your browser!"
HOMEPAGE="https://github.com/uazo/cromite"
PPC64_HASH="a85b64f07b489b8c6fdb13ecf79c16c56c560fc6"
PATCH_V="${PV%%\.*}-3"
COPIUM_COMMIT="fe1caafa06f27542c18a881348f78e984e2d9fe2"
SRC_URI="https://github.com/chromium-linux-tarballs/chromium-tarballs/releases/download/${PV/_*}/chromium-${PV/_*}-linux.tar.xz
	https://deps.gentoo.zip/www-client/chromium/rollup-wasm-node-${ROLLUP_VER}.tgz
	https://gitlab.com/Matt.Jolly/chromium-patches/-/archive/${PATCH_V}/chromium-patches-${PATCH_V}.tar.bz2
	!bundled-toolchain? (
		https://codeberg.org/selfisekai/copium/archive/${COPIUM_COMMIT}.tar.gz
			-> chromium-patches-copium-${COPIUM_COMMIT:0:10}.tar.gz
	)
	bundled-toolchain? (
		https://commondatastorage.googleapis.com/chromium-browser-clang/Linux_x64/clang-${BUNDLED_CLANG_VER}.tar.xz
			-> chromium-clang-${BUNDLED_CLANG_VER}.tar.xz
		https://commondatastorage.googleapis.com/chromium-browser-clang/Linux_x64/rust-toolchain-${BUNDLED_RUST_VER}-${BUNDLED_CLANG_VER%-*}.tar.xz
			-> chromium-rust-toolchain-${RUST_SHORT_HASH}-${BUNDLED_CLANG_VER%-*}.tar.xz
	)
	test? (
		https://chromium-fonts.storage.googleapis.com/${TEST_FONT} -> chromium-testfonts-${TEST_FONT:0:10}.tar.gz
	)
	ppc64? (
		https://gitlab.raptorengineering.com/raptor-engineering-public/chromium/openpower-patches/-/archive/${PPC64_HASH}/openpower-patches-${PPC64_HASH}.tar.bz2 -> chromium-openpower-${PPC64_HASH:0:10}.tar.bz2
	)
	https://github.com/uazo/${PN}/archive/${CROMITE_COMMIT_ID}.tar.gz -> ${PN}-${CROMITE_COMMIT_ID}.tar.gz
"

# https://gitlab.com/Matt.Jolly/chromium-patches/-/archive/${PATCH_V}/chromium-patches-${PATCH_V}.tar.bz2
# Gentoo tarball:
# https://chromium-tarballs.distfiles.gentoo.org/chromium-${PV/_*}.tar.xz -> chromium-${PV/_*}-gentoo.tar.xz
# Official tarball:
# https://commondatastorage.googleapis.com/chromium-browser-official/chromium-${PV/_*}${LITE_TARBALL:+-lite}.tar.xz

# https://gitweb.gentoo.org/proj/chromium-tools.git/tree/get-chromium-licences.py @ 145.0.7632.76
LICENSE="Apache-2.0 Apache-2.0-with-LLVM-exceptions BSD BSD-2 Base64 Boost-1.0 CC-BY-3.0 CC-BY-4.0 Clear-BSD FFT2D FTL"
LICENSE+=" IJG ISC LGPL-2 LGPL-2.1 MIT MPL-1.1 MPL-2.0 Ms-PL PSF-2 SGI-B-2.0 SSLeay SunSoft Unicode-3.0"
LICENSE+=" Unicode-DFS-2015 Unlicense UoI-NCSA ZLIB libtiff openssl"
LICENSE+=" GPL-3"

SLOT="beta"
# KEYWORDS="~amd64 ~arm64 ~ppc64 ~x86"

IUSE_SYSTEM_LIBS="abseil-cpp av1 brotli crc32c double-conversion ffmpeg +harfbuzz icu jsoncpp +libusb libvpx +openh264 openjpeg re2 snappy woff2 +zstd"
IUSE="+X bindist bluetooth bundled-toolchain cfi convert-dict cups custom-cflags debug ffmpeg-chromium enable-driver gtk4 hangouts headless kerberos +libcxx nvidia +official optimize-thinlto optimize-webui override-data-dir pax-kernel pgo"
IUSE+=" +proprietary-codecs pulseaudio qt6 screencast selinux test thinlto vaapi wayland widevine cpu_flags_ppc_vsx3"
RESTRICT="
	!bindist? ( bindist )
	!test? ( test )
	arm64? ( test )
	!system-ffmpeg? ( proprietary-codecs? ( bindist ) )
	!system-openh264? ( bindist )
"

REQUIRED_USE="
	!headless? ( || ( X wayland ) )
	screencast? ( wayland )
	ffmpeg-chromium? ( bindist proprietary-codecs )
	optimize-thinlto? ( thinlto )
	cfi? ( thinlto )
	x86? ( !thinlto !widevine )
	debug? ( !official )
	vaapi? ( !system-av1 !system-libvpx )
"

#declare -A CHROMIUM_COMMITS=(
#	["fcfb1a42813f1e9d8babedc7bb2e0f06101a3151"]="." #148+
#	["-acb47d9a6b56c4889a2ed4216e9968cfc740086c"]="."
#	# ["-37c28a19804e47a68eabf3cf882a310689fc325b"]="." #disable style check for cromite
#	# ["cd5a0df905a28faa89ff2a4ab44f893f84dc4487"]="net/third_party/quiche/src"
#)

if [ ! -z "${CROMITE_PR_COMMITS[*]}" ]; then
	for i in "${CROMITE_PR_COMMITS[@]}"; do
		SRC_URI+="https://github.com/uazo/${PN}/commit/$i.patch?full_index=true -> ${PN}-$i.patch
		"
	done
fi

if [ ! -z "${CHROMIUM_COMMITS[*]}" ]; then
	# for i in "${CHROMIUM_COMMITS[@]}"; do
	for i in "${!CHROMIUM_COMMITS[@]}"; do
		if [[ ${CHROMIUM_COMMITS[$i]} =~ webrtc ]]; then
		#TODO: is it safe to use this mirror?
		SRC_URI+="https://github.com/webrtc-mirror/webrtc/commit/${i/-}.patch?full_index=true -> webrtc-${i/-}.patch
		"
		elif [[ ${CHROMIUM_COMMITS[$i]} =~ angle ]]; then
		SRC_URI+="https://github.com/google/angle/commit/${i/-}.patch?full_index=true -> angle-${i/-}.patch
		"
		elif [[ ${CHROMIUM_COMMITS[$i]} =~ quiche ]]; then
		SRC_URI+="https://github.com/google/quiche/commit/${i/-}.patch?full_index=true -> quiche-${i/-}.patch
		"
		elif [[ ${CHROMIUM_COMMITS[$i]} =~ dawn ]]; then
		SRC_URI+="https://github.com/google/dawn/commit/${i/-}.patch?full_index=true -> dawn-${i/-}.patch
		"
		elif [[ ${CHROMIUM_COMMITS[$i]} =~ perfetto ]]; then
		SRC_URI+="https://github.com/google/perfetto/commit/${i/-}.patch?full_index=true -> perfetto-${i/-}.patch
		"
		elif [[ ${CHROMIUM_COMMITS[$i]} =~ ink ]]; then
		SRC_URI+="https://github.com/google/ink/commit/${i/-}.patch?full_index=true -> ink-${i/-}.patch
		"
		elif [[ ${CHROMIUM_COMMITS[$i]} =~ vulkan-utility-libraries ]]; then
		SRC_URI+="https://github.com/KhronosGroup/Vulkan-Utility-Libraries/commit/${i/-}.patch?full_index=true -> vulkan-utility-libraries-${i/-}.patch
		"
		elif [[ ${CHROMIUM_COMMITS[$i]} =~ ruy ]]; then
		SRC_URI+="https://github.com/google/ruy/commit/${i/-}.patch?full_index=true -> ruy-${i/-}.patch
		"
		else
		SRC_URI+="https://github.com/chromium/chromium/commit/${i/-}.patch?full_index=true -> chromium-${i/-}.patch
		"
		fi
	done
fi

for i in ${IUSE_SYSTEM_LIBS}; do
	[[ $i =~ ^(\+)?(.*)$ ]]
	IUSE+=" ${BASH_REMATCH[1]}system-${BASH_REMATCH[2]}"
done

COMMON_X_DEPEND="
	x11-libs/libXcomposite:=
	x11-libs/libXcursor:=
	x11-libs/libXdamage:=
	x11-libs/libXfixes:=
	>=x11-libs/libXi-1.6.0:=
	x11-libs/libXrandr:=
	x11-libs/libXrender:=
	x11-libs/libXtst:=
	x11-libs/libxshmfence:=
"

# sys-libs/zlib: https://bugs.gentoo.org/930365; -ng is not compatible.
# We _could_ use the bundled minizip, but that's against policy.
COMMON_SNAPSHOT_DEPEND="
	system-icu? ( >=dev-libs/icu-78:= )
	system-abseil-cpp? ( >=dev-cpp/abseil-cpp-20260107.0 )
	system-brotli? ( >=app-arch/brotli-9999 )
	system-crc32c? ( dev-libs/crc32c )
	system-double-conversion? ( dev-libs/double-conversion )
	system-woff2? ( media-libs/woff2 )
	system-snappy? ( app-arch/snappy )
	system-jsoncpp? ( dev-libs/jsoncpp )
	system-openjpeg? ( media-libs/openjpeg:2= )
	system-re2? ( >=dev-libs/re2-0.2019.08.01:= )
	system-libvpx? ( >=media-libs/libvpx-1.13.0:=[postproc] )
	system-libusb? ( virtual/libusb:1 )
	>=dev-libs/libxml2-2.12.4:=[icu]
	dev-libs/nspr:=
	>=dev-libs/nss-3.26:=
	dev-libs/libxslt:=
	media-libs/fontconfig:=
	>=media-libs/freetype-2.11.0-r1:=
	system-harfbuzz? ( >=media-libs/harfbuzz-3:0=[icu(-)] )
	media-libs/libjpeg-turbo:=
	media-libs/libpng:=
	system-zstd? ( >=app-arch/zstd-1.5.5:= )
	>=media-libs/libwebp-0.4.0:=
	media-libs/mesa:=[gbm(+)]
	>=media-libs/openh264-1.6.0:=
	system-av1? (
		>=media-libs/dav1d-1.0.0:=
		>=media-libs/libaom-3.7.0:=
	)
	sys-libs/zlib:=
	!headless? (
		dev-libs/glib:2
		>=media-libs/alsa-lib-1.0.19:=
		pulseaudio? (
			|| (
				media-libs/libpulse
				>=media-sound/apulse-0.1.9
			)
		)
		sys-apps/pciutils:=
		kerberos? ( virtual/krb5 )
		vaapi? ( >=media-libs/libva-2.7:=[X?,wayland?] )
		X? (
			x11-base/xorg-proto:=
			x11-libs/libX11:=
			x11-libs/libxcb:=
			x11-libs/libXext:=
		)
		x11-libs/libxkbcommon:=
		wayland? (
			dev-libs/libffi:=
			dev-libs/wayland:=
			screencast? (
				media-video/pipewire:=
				|| (
					sys-apps/xdg-desktop-portal-gnome
					sys-apps/xdg-desktop-portal-gtk
					kde-plasma/xdg-desktop-portal-kde
					gui-libs/xdg-desktop-portal-lxqt
					gui-libs/xdg-desktop-portal-wlr
				)
			)
		)
	)
"

COMMON_DEPEND="
	${COMMON_SNAPSHOT_DEPEND}
	app-arch/bzip2:=
	dev-libs/expat:=
	system-ffmpeg? (
		>=media-video/ffmpeg-6.1:=
		>=media-libs/opus-1.3.1:=
	)
	net-misc/curl[ssl]
	sys-apps/dbus:=
	media-libs/flac:=
	sys-libs/zlib:=[minizip]
	!headless? (
		>=app-accessibility/at-spi2-core-2.46.0:2
		media-libs/mesa:=[X?,wayland?]
		virtual/udev
		x11-libs/cairo:=
		x11-libs/gdk-pixbuf:2
		x11-libs/pango:=
		cups? ( >=net-print/cups-1.3.11:= )
		qt6? ( dev-qt/qtbase:6[gui,widgets] )
		X? ( ${COMMON_X_DEPEND} )
	)
"
#!www-client/cromite:0
RDEPEND="${COMMON_DEPEND}
	>=www-client/chromium-common-2
	!headless? (
		|| (
			x11-libs/gtk+:3[X?,wayland?]
			gui-libs/gtk:4[X?,wayland?]
		)
		qt6? ( dev-qt/qtbase:6[X?,wayland?] )
	)
	virtual/ttf-fonts
	selinux? ( sec-policy/selinux-chromium )
	bindist? (
		ffmpeg-chromium? ( media-video/ffmpeg-chromium:${PV%%\.*} )
	)
	!override-data-dir? (
		!www-client/chromium:${SLOT}
		!www-client/ungoogled-chromium-bin
		!www-client/ungoogled-chromium:${SLOT}[-override-data-dir]
	)
"

DEPEND="${COMMON_DEPEND}
	!headless? (
		gtk4? ( gui-libs/gtk:4[X?,wayland?] )
		!gtk4? ( x11-libs/gtk+:3[X?,wayland?] )
	)
"

	# pgo? ( >=llvm-core/clang-22.0.0_pre20260106 >=llvm-core/lld-22.0.0_pre20260106	)
BDEPEND="
	${COMMON_SNAPSHOT_DEPEND}
	${PYTHON_DEPS}
	$(python_gen_any_dep '
		dev-python/setuptools[${PYTHON_USEDEP}]
	')
	>=app-arch/gzip-1.7
	!headless? (
		qt6? ( dev-qt/qtbase:6 )
	)
	!bundled-toolchain? ( $(llvm_gen_dep '
		llvm-core/clang:${LLVM_SLOT}
		llvm-core/llvm:${LLVM_SLOT}
		llvm-core/lld:${LLVM_SLOT}
		cfi? ( llvm-runtimes/clang-runtime:${LLVM_SLOT}[sanitize] )
		official? (
			!ppc64? ( llvm-runtimes/compiler-rt-sanitizers:${LLVM_SLOT}[cfi] )
		) ')
		${RUST_DEPEND}
	)
	>=dev-util/bindgen-0.72.1
	>=dev-build/gn-${GN_MIN_VER}
	app-alternatives/ninja
	dev-lang/perl
	>=dev-util/gperf-3.2
	dev-util/esbuild:${ESBUILD_VER}
	dev-vcs/git
	>=net-libs/nodejs-${NODE_VER}[inspector]
	sys-apps/hwdata
	>=sys-devel/bison-2.4.3
	sys-devel/flex
	virtual/pkgconfig
	x11-misc/xdg-utils
"

if ! has chromium_pkg_die ${EBUILD_DEATH_HOOKS}; then
	EBUILD_DEATH_HOOKS+=" chromium_pkg_die";
fi

DISABLE_AUTOFORMATTING="yes"
DOC_CONTENTS="
Some web pages may require additional fonts to display properly.
Try installing some of the following packages if some characters
are not displayed properly:
- media-fonts/arphicfonts
- media-fonts/droid
- media-fonts/ipamonafont
- media-fonts/noto
- media-fonts/ja-ipafonts
- media-fonts/takao-fonts
- media-fonts/wqy-microhei
- media-fonts/wqy-zenhei

To fix broken icons on the Downloads page, you should install an icon
theme that covers the appropriate MIME types, and configure this as your
GTK+ icon theme.

For native file dialogs in KDE, install kde-apps/kdialog.

To make password storage work with your desktop environment you may
have install one of the supported credentials management applications:
- app-crypt/libsecret (GNOME)
- kde-frameworks/kwallet (KDE)
If you have one of above packages installed, but don't want to use
them in Chromium, then add --password-store=basic to CHROMIUM_FLAGS
in /etc/chromium/default.
"

S="${WORKDIR}/chromium-${PV/_*}"

python_check_deps() {
	python_has_version "dev-python/setuptools[${PYTHON_USEDEP}]"
}

pre_build_checks() {
	# Check build requirements: bugs #471810, #541816, #914220
	# We're going to start doing maths here on the size of an unpacked source tarball,
	# this should make updates easier as chromium continues to balloon in size.
	# xz -l /var/cache/distfiles/chromium-${PV}*.tar.xz
	local base_disk=9 # Round up
	use test && base_disk=$((base_disk + 5))
	local extra_disk=1 # Always include a little extra space
	local memory=4
	tc-is-cross-compiler && extra_disk=$((extra_disk * 2))
	if tc-is-lto || use pgo; then
		memory=$((memory * 2 + 1))
		tc-is-cross-compiler && extra_disk=$((extra_disk * 2)) # Double the requirements
		use pgo && extra_disk=$((extra_disk + 4))
	fi
	if is-flagq '-g?(gdb)?([1-9])'; then
		if use custom-cflags; then
			extra_disk=$((extra_disk + 5))
		fi
		memory=$((memory * 2))
	fi
	local CHECKREQS_MEMORY="${memory}G"
	local CHECKREQS_DISK_BUILD="$((base_disk + extra_disk))G"
	check-reqs_${EBUILD_PHASE_FUNC}
}

pkg_pretend() {
	if [[ ${MERGE_TYPE} != binary ]]; then
		# The pre_build_checks are all about compilation resources, no need to run it for a binpkg
		pre_build_checks
	fi

	if use headless; then
		local headless_unused_flags=("cups" "kerberos" "pulseaudio" "qt6" "vaapi" "wayland")
		for myiuse in ${headless_unused_flags[@]}; do
			use ${myiuse} && ewarn "Ignoring USE=${myiuse}, USE=headless is set."
		done
	fi

	if ! use bindist && use ffmpeg-chromium; then
		ewarn "Ignoring USE=ffmpeg-chromium, USE=bindist is not set."
	fi
	if use libcxx; then
		ewarn
		ewarn "Building with libcxx, please be aware that system-*"
		ewarn "and some other c++ dependencies need to be compiled"
		ewarn "with the same c++ library as ungoogled-chromium itself"
		ewarn "dev-libs/jsoncpp is most problematic, see #58 #49 #119 for details"
		ewarn "Simplest solution would be to disable corresponding system-* flags"
		ewarn
	fi
	if use cfi; then
		ewarn
		ewarn "Building with cfi is only possible if building with -stdlib=libc++"
		ewarn "Make sure all dependencies are also built this way, see #40"
		ewarn
	fi
}

pkg_setup() {
	if [[ ${MERGE_TYPE} != binary ]]; then
		# The pre_build_checks are all about compilation resources, no need to run it for a binpkg
		pre_build_checks

		# We haven't massaged any CFLAGS yet, so we want to do this before we force CC/CXX to prevent warnings.
		local want_lto="false"
		tc-is-lto && want_lto="true"

		# The linux:unbundle toolchain in GN grabs CC, CXX, CPP (etc) from the environment
		# We'll set these to clang here then use llvm-utils functions to very explicitly set these
		# to a sane value.
		# This is effectively the 'force-clang' path if GCC support is re-added.
		if use !bundled-toolchain; then
			llvm-r1_pkg_setup
			rust_pkg_setup

			# Forcing clang; respect llvm_slot_x to enable selection of impl via LLVM_COMPAT
			AR=llvm-ar
			CPP="${CHOST}-clang++-${LLVM_SLOT} -E"
			NM=llvm-nm
			CC="${CHOST}-clang-${LLVM_SLOT}"
			CXX="${CHOST}-clang++-${LLVM_SLOT}"
		fi

		use_lto="false"
		local lto_usable="true"
		if [[ "$want_lto" == "true" ]]; then
			if use arm64 && [[ "${LLVM_SLOT}" -lt 22 ]]; then
				einfo "LTO is broken with LLVM 21 on arm64, ignoring CFLAGS."
				lto_usable="false"
			else
				use_lto="true"
			fi
			# We can rely on GN to do this for us; without this builds
			# take significantly longer with LTO enabled.
			filter-lto
		fi

		if [[ "$use_lto" == "false" ]] && use official && [[ "$lto_usable" == "true" ]]; then
			einfo "USE=official selected and LTO not detected."
			einfo "It is _highly_ recommended that LTO be enabled for performance reasons"
			einfo "and to be consistent with the upstream \"official\" build optimisations."
		fi

		if [[ "$use_lto" == "false" ]] && use test; then
			die "Tests require CFI which requires LTO"
		fi

		export use_lto

		# 936858
		if tc-ld-is-mold; then
			eerror "Your toolchain is using the mold linker."
			eerror "This is not supported by Chromium."
			die "Please switch to a different linker."
		fi

		if tc-is-cross-compiler; then
			use pgo && die "The pgo USE flag cannot be used when cross-compiling"
			CPP="${CBUILD}-clang++-${LLVM_SLOT} -E"
		fi

		# Sanity checks for development convenience
		if ver_test $(gn --version || die) -lt ${GN_MIN_VER}; then
			die "dev-build/gn >= ${GN_MIN_VER} is required to build this Chromium"
		fi

		# Sometimes, when adding a new LLVM slot, devs (me) forget to install an appropriate lld.
		local lld_ver=$(ld.lld --version | awk '{split($2,a,"."); print a[1]}' || die "Failed to check lld version")
		if [[ ${lld_ver} -lt ${LLVM_SLOT} ]]; then
			die "Your lld version (${lld_ver}) is too old for the selected LLVM slot (${LLVM_SLOT}). Please install a newer lld or select an older LLVM slot."
		fi
	fi

	chromium_suid_sandbox_check_kernel_config
}

src_unpack() {
	## Here be dragons!
	#local XCLD="--exclude=chromium-${PV/_*}/third_party/instrumented_libs  \
	#	--exclude=chromium-${PV/_*}/third_party/llvm \
	#	--exclude=chromium-${PV/_*}/third_party/llvm-build \
	#	--exclude=chromium-${PV/_*}/third_party/node/linux \
	#	--exclude=chromium-${PV/_*}/third_party/rust-src \
	#	--exclude=chromium-${PV/_*}/third_party/rust-toolchain \
	#	--exclude=chromium-${PV/_*}/build/linux/debian_bullseye_i386-sysroot \
	#	--exclude=chromium-${PV/_*}/build/linux/debian_bullseye_amd64-sysroot \
	#	--exclude=chromium-${PV/_*}/third_party/angle/third_party/VK-GL-CTS \
	#"

	#if ! use libcxx ; then
	#	XCLD+=" --exclude=chromium-${PV/_*}/third_party/libc++"
	#fi

	#if ! use pgo ; then
	#	XCLD+=" --exclude=chromium-${PV/_*}/chrome/build/pgo_profiles"
	#fi

	#einfo "Unpacking chromium-${PV/_*}.tar.xz to ${WORKDIR}"
	## Gentoo tarball:
	## tar ${XCLD} -xf "${DISTDIR}/chromium-${PV/_*}-gentoo.tar.xz" -C "${WORKDIR}" || die
	#tar ${XCLD} -xf "${DISTDIR}/chromium-${PV/_*}${LITE_TARBALL:+-lite}.tar.xz" -C "${WORKDIR}" || die

	## unpack chromium-patches-${PATCH_V}.tar.bz2
	## Warned you!


	unpack chromium-${PV/_*}-linux.tar.xz
	unpack chromium-patches-${PATCH_V}.tar.bz2
	# These should only be required when we're not using the official toolchain
	if use !bundled-toolchain; then
		unpack chromium-patches-copium-${COPIUM_COMMIT:0:10}.tar.gz
	fi

	if use test; then
		# This just contains a bunch of font files that need to be unpacked (or moved) to the correct location.
		local testfonts_dir="${WORKDIR}/chromium-${PV/_*}/third_party/test_fonts/test_fonts"
		local testfonts_tar="${DISTDIR}/chromium-testfonts-${TEST_FONT:0:10}.tar.gz"
		einfo "Unpacking test fonts ..."
		tar xf "${testfonts_tar}" -C "${testfonts_dir}" || die "Failed to unpack testfonts"
	fi

	# We need to manually unpack this since M126 else we'd unpack one toolchain over the other.
	# Since we're doing that anyway let's unpack to sensible locations to make symlink creation easier.
	if use bundled-toolchain; then
		einfo "Unpacking bundled Clang ..."
		mkdir -p "${WORKDIR}"/clang || die "Failed to create clang directory"
		tar xf "${DISTDIR}/chromium-clang-${BUNDLED_CLANG_VER}.tar.xz" -C "${WORKDIR}/clang" || die "Failed to unpack Clang"
		einfo "Unpacking bundled Rust ..."
		local rust_dir="${WORKDIR}/rust-toolchain"
		mkdir -p "${rust_dir}" || die "Failed to create rust toolchain directory"
		tar xf "${DISTDIR}/chromium-rust-toolchain-${RUST_SHORT_HASH}-${BUNDLED_CLANG_VER%-*}.tar.xz" -C "${rust_dir}" ||
			die "Failed to unpack Rust"
	fi

	if use ppc64; then
		unpack chromium-openpower-${PPC64_HASH:0:10}.tar.bz2
	fi

	# This is a dirty hack, but we need rollup to build successfully and it's proving to be challenging
	# to build locally due to deps
	unpack rollup-wasm-node-${ROLLUP_VER}.tgz

	unpack cromite-${CROMITE_COMMIT_ID}.tar.gz
}

remove_compiler_builtins() {
	# We can't use the bundled compiler builtins with the system toolchain
	# We used to `grep` then `sed`, but it was indirect. Combining the two into a single
	# `awk` command is more efficient and lets us document the logic more clearly.

	local pattern='    configs += [ "//build/config/clang:compiler_builtins" ]'
	local target='build/config/compiler/BUILD.gn'

	local tmpfile
	tmpfile=$(mktemp) || die "Failed to create temporary file."

	if awk -v pat="${pattern}" '
	BEGIN {
		match_found = 0
	}

	# If the delete countdown is active, decrement it and skip to the next line.
	d > 0 { d--; next }

	# If the current line matches the pattern...
	$0 == pat {
		match_found = 1   # ...set our flag to true.
		d = 2             # Set delete counter for this line and the next two.
		prev = ""         # Clear the buffered previous line so it is not printed.
		next
	}

	# For any other line, print the buffered previous line.
	NR > 1 { print prev }

	# Buffer the current line to be printed on the next cycle.
	{ prev = $0 }

	END {
		# Print the last line if it was not part of a deleted block.
		if (d == 0) { print prev }

		# If the pattern was never found, exit with a failure code.
		if (match_found == 0) {
		exit 1
		}
	}
	' "${target}" > "${tmpfile}"; then
		# AWK SUCCEEDED (exit code 0): The pattern was found and edited.
		# This is to avoid gawk's `-i inplace` option which users complain about.
		mv "${tmpfile}" "${target}"
	else
		# AWK FAILED (exit code 1): The pattern was not found.
		rm -f "${tmpfile}"
		die "Awk patch failed: Pattern not found in ${target}."
	fi
}

src_prepare() {
	# Calling this here supports resumption via FEATURES=keepwork
	python_setup

	# We'll fill this in as we go. Patches go in chromium-patches.
	local PATCHES=()

	rm "${WORKDIR}/chromium-patches-${PATCH_V}/common/cr131-unbundle-icu-target.patch"
	if use pgo; then
		rm "${WORKDIR}/chromium-patches-${PATCH_V}/rust/cr146-fix-botched-bytemuck-roll.patch"
		sed -i '/SupportedLaneCount/d' third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/zeroable.rs || die
		sed -i '/SupportedLaneCount/d' third_party/rust/chromium_crates_io/vendor/bytemuck-v1/src/pod.rs || die
	fi

	#cp -f ${WORKDIR}/chromium-patches-${PATCH_V}/*-compiler.patch "${T}/compiler.patch"
	##cp -f ${FILESDIR}/chromium-147-compiler.patch "${T}/compiler.patch"
	#if ! use custom-cflags; then #See #25 #92
	#	sed -i '/default_stack_frames/Q' "${T}/compiler.patch" || die
	#fi

	PATCHES+=( "${WORKDIR}/chromium-patches-${PATCH_V}/common/" )
	PATCHES+=( "${FILESDIR}/restore-x86-r3.patch" )

	# https://issues.chromium.org/issues/442698344
	# Unreleased fontconfig changed magic numbers and google have rolled to this version
	if has_version "<=media-libs/fontconfig-2.17.1"; then
		PATCHES+=( "${FILESDIR}/chromium-142-work-with-old-fontconfig.patch" )
	fi

	if use bundled-toolchain; then
		# We need to symlink the toolchain into the expected location
		einfo "Symlinking Clang toolchain to expected location ..."
		mkdir -p third_party/llvm-build/ || die "Failed to create llvm-build directory"
		# the 'Chromium Linux Tarballs' seem to already have 'Release+Asserts/{lib,bin}'; not sure if this is an
		# upstream change - we're using the same scripts to build, theoretically. We'll still attempt to create
		# llvm-build, but we'll rm Release+Asserts and symlink directly.
		if [[ -d third_party/llvm-build/Release+Asserts ]]; then
			rm -r third_party/llvm-build/Release+Asserts || die "Failed to remove third_party/llvm-build/Release+Asserts"
		fi
		ln -s "${WORKDIR}"/clang third_party/llvm-build/Release+Asserts || die "Failed to bundle Clang"
		einfo "Symlinking Rust toolchain to expected location ..."
		# As above, so below
		if [[ -d third_party/rust-toolchain ]]; then
			rm -r third_party/rust-toolchain || die "Failed to remove third_party/rust-toolchain"
		fi
		ln -s "${WORKDIR}"/rust-toolchain third_party/rust-toolchain || die "Failed to bundle rust"
		cp "${WORKDIR}"/rust-toolchain/VERSION \
			"${WORKDIR}"/rust-toolchain/INSTALLED_VERSION || die "Failed to set rust version"
	else
		# We don't need our toolchain patches if we're using the official toolchain

		# Copium patches go here.
		PATCHES+=(
			"${WORKDIR}/copium/cr143-libsync-__BEGIN_DECLS.patch"
		)

		# Automate conditional application of chromium-patches
		# The directory structure is expected to be something like:
		# chromium-patches-145/
		# ├── toolchain/
		# │   ├── cr123-foo.patch
		# │   └── cr135-bar.patch
		# ├── llvm/
		# │   ├── cr144-baz.patch
		# │   └── lt-23/
		# │       └── cr145-bleeding-edge-llvm-feature.patch
		# Where `lt-23` means "apply this patch if the LLVM version is less than 23".
		# Only categories in `slot_map` will be checked for version constraints.
		shopt -s nullglob
		local -A slot_map=( [llvm]="${LLVM_SLOT}" [rust]="${RUST_SLOT}" )

		for category in "${WORKDIR}/chromium-patches-${PATCH_V}"/*/; do
			local category_name="${category%/}"
			category_name="${category_name##*/}"

			# Skip arch-specific categories
			if [[ "${category_name}" == "ppc64le" ]]; then
				use ppc64 || continue
			fi

			# We applied common patches above, no need to apply them again here
			[[ "${category_name}" == "common" ]] && continue

			# Unconditional patches for this category
			PATCHES+=( "${category}"*.patch )

			# Version-constrained subdirectories (e.g., llvm/lt-23/)
			for constraint_dir in "${category}"*/; do
				local dir_name="${constraint_dir%/}"
				dir_name="${dir_name##*/}"
				if [[ "${dir_name}" =~ ^lt-(.*)$ && -v slot_map[${category_name}] ]]; then
					ver_test "${slot_map[${category_name}]}" -lt "${BASH_REMATCH[1]}" &&
						PATCHES+=( "${constraint_dir}"*.patch )
				fi
			done
		done

		shopt -u nullglob

		# Strictly speaking this doesn't need to be gated (no bundled toolchain for ppc64); it keeps the logic together
		if use ppc64; then
			local patchset_dir="${WORKDIR}/openpower-patches-${PPC64_HASH}/patches"
			# patch causes build errors on 4K page systems (https://bugs.gentoo.org/show_bug.cgi?id=940304)
			local page_size_patch="ppc64le/third_party/use-sysconf-page-size-on-ppc64.patch"
			local isa_3_patch="ppc64le/core/baseline-isa-3-0.patch"
			# Apply the OpenPOWER patches (check for page size and isa 3.0)
			openpower_patches=( $(grep -E "^ppc64le|^upstream" "${patchset_dir}/series" | grep -v "${page_size_patch}" |
				grep -v "${isa_3_patch}" || die) )
			for patch in "${openpower_patches[@]}"; do
				PATCHES+=( "${patchset_dir}/${patch}" )
			done
			if [[ $(getconf PAGESIZE) == 65536 ]]; then
				PATCHES+=( "${patchset_dir}/${page_size_patch}" )
			fi
			# We use vsx3 as a proxy for 'want isa3.0' (POWER9)
			if use cpu_flags_ppc_vsx3 ; then
				PATCHES+=( "${patchset_dir}/${isa_3_patch}" )
			fi
		fi

		remove_compiler_builtins

		# We can't rely on the eselect'd Rust to actually include rustfmt, so we'll point to the selected slot specifically.
		local suffix=""
		if [[ "${RUST_TYPE}" == "binary" ]]; then
			suffix="-bin-${RUST_SLOT}"
		else
			suffix="-${RUST_SLOT}"
		fi
		sed -i "s|/bin/rustfmt|/bin/rustfmt${suffix}|g" build/rust/rust_bindgen_generator.gni ||
			die "Failed to update rustfmt path"

	fi

	# Do this before we apply patches since (e.g.) ppc64 needs to patch rollup and it's easier in ${S}
	einfo "Moving rollup wasm-node package into place ..."
	mkdir -p third_party/devtools-frontend/src/node_modules/@rollup/wasm-node ||
		die "Failed to create node_modules/@rollup/wasm-node"
	mv "${WORKDIR}"/package/* third_party/devtools-frontend/src/node_modules/@rollup/wasm-node ||
		die "Failed to move rollup package"

	if [ ! -z "${CHROMIUM_COMMITS[*]}" ]; then
		# for i in "${CHROMIUM_COMMITS[@]}"; do
		for i in "${!CHROMIUM_COMMITS[@]}"; do
			if [[ ${CHROMIUM_COMMITS[$i]} =~ webrtc ]]; then
				patch_prefix="webrtc"
			elif [[ ${CHROMIUM_COMMITS[$i]} =~ angle ]]; then
				patch_prefix="angle"
			elif [[ ${CHROMIUM_COMMITS[$i]} =~ quiche ]]; then
				patch_prefix="quiche"
			elif [[ ${CHROMIUM_COMMITS[$i]} =~ dawn ]]; then
				patch_prefix="dawn"
			elif [[ ${CHROMIUM_COMMITS[$i]} =~ perfetto ]]; then
				patch_prefix="perfetto"
			elif [[ ${CHROMIUM_COMMITS[$i]} =~ ink ]]; then
				patch_prefix="ink"
			elif [[ ${CHROMIUM_COMMITS[$i]} =~ vulkan-utility-libraries ]]; then
				patch_prefix="vulkan-utility-libraries"
			elif [[ ${CHROMIUM_COMMITS[$i]} =~ ruy ]]; then
				patch_prefix="ruy"
			else
				patch_prefix="chromium"
			fi
			pushd "${CHROMIUM_COMMITS[$i]}" > /dev/null || die
			if [[ $i = -*  ]]; then
				einfo "Reverting ${patch_prefix}-${i/-}.patch"
				git_wrapper apply -R --exclude="*unittest.cc" --exclude="DEPS" \
					-p1 < "${DISTDIR}/${patch_prefix}-${i/-}.patch"
			else
				einfo "Applying ${patch_prefix}-${i/-}.patch"
				git_wrapper apply --exclude="*unittest.cc" --exclude="DEPS" \
					-p1 < "${DISTDIR}/${patch_prefix}-${i/-}.patch"
			fi
			popd > /dev/null || die
		done
	fi

	if ! use bluetooth ; then
		PATCHES+=(
			"${FILESDIR}/disable-bluez-r7.patch"
		)
	fi

	if use convert-dict ; then
		PATCHES+=(
			"${FILESDIR}/chromium-ucf-dict-utility-r3.patch"
		)
	fi

	if ! use libcxx ; then
		PATCHES+=(
			"${FILESDIR}/fix-wayland-oncecallback-copy.patch"
		)
	fi

	if use system-ffmpeg; then
		PATCHES+=(
			"${FILESDIR}/chromium-141-opus-mp3.patch"
			"${FILESDIR}/chromium-135-hevc.patch"
		)
		sed -i "\!AVFMT_FLAG_NOH264PARSE!d" media/filters/ffmpeg_glue.cc || die
		ewarn "You need to expose \"av_stream_get_first_dts\" in ffmpeg via user patch"
	fi

	if use system-av1; then
		PATCHES+=(
			"${FILESDIR}/chromium-system-av1.patch"
		)
	fi

	if use system-libvpx; then
		PATCHES+=(
			"${FILESDIR}/chromium-system-libvpx.patch"
		)
	fi

	if use system-openjpeg ; then
		PATCHES+=(
			"${FILESDIR}/chromium-system-openjpeg-r4.patch"
		)
	fi

	# if use x86 ; then
	# 	#* Fixes a segfault in transport_security_state_generator
	# 	PATCHES+=(
	# 		"${FILESDIR}/fix-segfault-x86.patch"
	# 	)
	# fi

	# Testing all patches when NODIE is defined
	if [ ! -z "${NODIE}" ]; then
		for i in "${PATCHES[@]}"; do
			eapply_wrapper "$i"
		done
		nonfatal eapply_user
	else
		default
	fi

	# if [[ ${LLVM_SLOT} == "19" ]]; then
	# 	# Upstream now hard depend on a feature that was added in LLVM 20.1, but we don't want to stabilise that yet.
	# 	# Do the temp file shuffle in case someone is using something other than `gawk`
	# 	{
	# 		awk '/config\("clang_warning_suppression"\) \{/	{ print $0 " }"; sub(/clang/, "xclang"); print; next }
	# 			{ print }' build/config/compiler/BUILD.gn > "${T}/build.gn" && \
	# 			mv "${T}/build.gn" build/config/compiler/BUILD.gn
	# 	} || die "Unable to disable warning suppression"
	# fi

	## Not included in -lite tarballs, but we should check for it anyway.
	#if [[ -f third_party/node/linux/node-linux-x64/bin/node ]]; then
	#	rm third_party/node/linux/node-linux-x64/bin/node || die
	#else
	#	mkdir -p third_party/node/linux/node-linux-x64/bin || die
	#fi
	#ln -s "${EPREFIX}"/usr/bin/node third_party/node/linux/node-linux-x64/bin/node || die

	cp "${FILESDIR}/libusb.gn" build/linux/unbundle || die
	sed -i '/^REPLACEMENTS.*$/{s++REPLACEMENTS = {"libusb":"third_party/libusb/BUILD.gn",+;h};${x;/./{x;q0};x;q1}' \
		build/linux/unbundle/replace_gn_files.py || die
	sed -i '/^.*deps.*third_party\/jsoncpp.*$/{s++public_deps \+= [ "//third_party/jsoncpp" ]+;h};${x;/./{x;q0};x;q1}' \
		third_party/webrtc/rtc_base/BUILD.gn || die

	if use override-data-dir; then
		sed -i '/"chromium";/{s++"cromite";+;h};${x;/./{x;q0};x;q1}' \
			chrome/common/chrome_paths_linux.cc || die
	fi

	if use system-abseil-cpp; then
		eapply_wrapper "${FILESDIR}/chromium-147-system-abseil.patch"

		#! SFINAE mangling incompatibility between clang and gcc:
		#! https://github.com/llvm/llvm-project/issues/85656
		#! gcc: 	_ZN4absl12lts_202601074CordC1INSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEELi0EEEOT_
		#! clang:	_ZN4absl12lts_202601074CordC1INSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEETnNSt9enable_ifIXsr3std7is_sameIT_S8_EE5valueEiE4typeELi0EEEOSA_
		#! So, either this:
		eapply_wrapper "${FILESDIR}/chromium-141-system-abseil-cord.patch"
		#! or build with -fclang-abi-compat=17

		# cp -f /usr/include/absl/base/options.h third_party/abseil-cpp/absl/base/options.h
		# sed -i '/^#define ABSL_OPTION_USE_STD_ORDERING.*$/{s++#define ABSL_OPTION_USE_STD_ORDERING 1+;h};${x;/./{x;q0};x;q1}' \
		# 	third_party/abseil-cpp/absl/base/options.h || die
	fi

	readarray -t topatch < "${WORKDIR}/cromite-${CROMITE_COMMIT_ID}/build/cromite_patches_list.txt"
	for i in "${topatch[@]}"; do
		if [ -z "$i" ] || [[ "$i" =~ ^#.* ]]; then
			continue
		fi
		if [ "$i" = "Add-support-to-jxl.patch" ] ||
			[ "$i" = "Do-not-check-for-the-presence-of-use-remoteexec.patch" ] ||
			[ "$i" = "Force-use-vpython3-for-all-scripts.patch" ] ||
			[ "$i" = "Force-use-vpython3-for-some-scripts.patch" ] ||
			[ "$i" = "Add-search-engine.patch" ] ||
			[ "$i" = "Enable-platform-aac-audio-and-h264-video.patch" ]; then
			ewarn "Skipping ${i}"
			continue;
		fi
		if [ "$i" = "Add-kill-switch-for-unsupported-clangd-flags.patch" ] ||
			[ "$i" = "Fix-chromium-build-bugs.patch" ]; then
			ewarn "Skipping ${i}: already applied"
			continue;
		fi
		einfo "$i"
		# ebegin "$i"
		git apply --exclude="*/web_tests/*" --exclude="*/test-list/*" \
			--exclude="*/uv/test/*" --exclude="*.rst" \
			--exclude="*/cctest/*" --exclude="*/unittests/*" \
			--exclude="*/test/data/*" --exclude="*/.eslintrc*" \
			--exclude="*/commit_stats/*" --exclude="chrome/android/*" \
			--exclude="android_webview/*" --exclude="chrome/browser/ui/android/*" \
			-p1 < "${WORKDIR}/cromite-${CROMITE_COMMIT_ID}/build/patches/$i" || die
		# eend $? || die
	done

	if ! use libcxx ; then
		eapply "${FILESDIR}/cromite-libstdc++.patch"
	fi

	# Sanity check esbuild version before we start removing files.
	# We _could_ patch the version check out - in theory esbuild upstream are being super conservative after
	# arch(AUR) packaged an `esbuild` binary and set ESBUILD_BINARY_PATH=/usr/bin/esbuild, causing much breakage,
	# but this is fine too and exactly matches what upstream are expecting.
	# https://github.com/evanw/esbuild/issues/2894
	local esbuild_js="${S}/third_party/devtools-frontend/src/node_modules/esbuild/lib/main.js"
	local found
	found=$(awk -F'"' '/if \(binaryVersion !==/ {print $2}' "${esbuild_js}")
	if [[ "${found}" != "${ESBUILD_VER}" ]]; then
		die "esbuild version mismatch: expected ${ESBUILD_VER}, found ${found}"
	fi

	elog "Removing bundled binaries from source tree ..."
	# Purge bundled ELF files: These are non-portable and will cause issues if used instead of system versions.
	# Use `--wasm` to also remove WebAssembly binaries, if desired - they're portable so shouldn't break builds.
	${EPYTHON} "${FILESDIR}/bin-finder.py" --elf "${S}" | awk '{print $1}' | xargs rm -f ||
		die "Failed to remove bundled binaries"

	# And now we restore any that we actually need, from the host system
	local esbuild_path="${S}/third_party/devtools-frontend/src/third_party/esbuild"
	local -A restore_list=(
		["/usr/bin/esbuild-${ESBUILD_VER}"]="${esbuild_path}/esbuild"
		["/usr/bin/gperf"]="${S}/third_party/gperf/cipd/bin/gperf"
		["/usr/bin/node"]="${S}/third_party/node/linux/node-linux-x64/bin/node"
	)

	for src in "${!restore_list[@]}"; do
		dst="${restore_list[${src}]}"
		if [[ -f "${src}" ]]; then
			einfo "Symlinking ${src} ..."
			# Make sure the parent dir exists; some tarballs don't include (e.g.) node's bindir
			mkdir -p "$(dirname "${dst}")" || die "Failed to create directory for ${dst}"
			ln -s "${src}" "${dst}" || die "Failed to symlink ${dst} from ${src}"
			if [[ ! -L "${dst}" || "$(readlink -f "${dst}")" != "${src}" ]]; then
				die "Symlink verification failed for ${dst} -> ${src}"
			fi
		else
			die "Expected to find ${src} to restore ${dst}, but it does not exist."
		fi
	done

	# adjust python interpreter version
	sed -i -e "s|\(^script_executable = \).*|\1\"${EPYTHON}\"|g" .gn || die

	# Use the system copy of hwdata's usb.ids; upstream is woefully out of date (2015!)
	sed 's|//third_party/usb_ids/usb.ids|/usr/share/hwdata/usb.ids|g' \
		-i services/device/public/cpp/usb/BUILD.gn || die "Failed to set system usb.ids path"

	# remove_bundled_libraries.py walks the source tree and looks for paths containing the substring 'third_party'
	# whitelist matches use the right-most matching path component, so we need to whitelist from that point down.
	local keeplibs=(
		base/third_party/cityhash
	)
	use system-double-conversion || keeplibs+=(
		base/third_party/double_conversion
	)
	keeplibs+=(
		base/third_party/icu
		base/third_party/nspr
		base/third_party/superfasthash
		base/third_party/symbolize
		base/third_party/xdg_user_dirs
		buildtools/third_party/libc++
		buildtools/third_party/libc++abi
		cromite_flags/third_party
		net/third_party/mozilla_security_manager
		net/third_party/quic
		net/third_party/uri_template
	)
	use system-abseil-cpp || keeplibs+=(
		third_party/abseil-cpp
	)
	keeplibs+=(
		third_party/angle
		third_party/angle/src/common/third_party/xxhash
		third_party/angle/src/third_party/ceval
	)
	use nvidia || keeplibs+=(
		third_party/angle/src/third_party/libXNVCtrl
	)
	keeplibs+=(
		third_party/angle/src/third_party/volk
		third_party/anonymous_tokens
		third_party/apple_apsl
		third_party/axe-core
		third_party/bidimapper
		third_party/blink
		third_party/boringssl
		third_party/boringssl/src/third_party/fiat
		third_party/breakpad
		third_party/breakpad/breakpad/src/third_party/curl
	)
	use system-brotli || keeplibs+=(
		third_party/brotli
	)
	keeplibs+=(
		third_party/catapult
		third_party/catapult/common/py_vulcanize/third_party/rcssmin
		third_party/catapult/common/py_vulcanize/third_party/rjsmin
		third_party/catapult/third_party/beautifulsoup4-4.9.3
		third_party/catapult/third_party/html5lib-1.1
		third_party/catapult/third_party/polymer
		third_party/catapult/third_party/six
		third_party/catapult/third_party/typ
		third_party/catapult/tracing/third_party/d3
		third_party/catapult/tracing/third_party/gl-matrix
		third_party/catapult/tracing/third_party/jpeg-js
		third_party/catapult/tracing/third_party/jszip
		third_party/catapult/tracing/third_party/mannwhitneyu
		third_party/catapult/tracing/third_party/oboe
		third_party/catapult/tracing/third_party/pako
		third_party/ced
		third_party/cld_3
		third_party/closure_compiler
	)
	use libcxx && keeplibs+=(
		third_party/compiler-rt
	)
	keeplibs+=(
		third_party/content_analysis_sdk
		third_party/cpuinfo
		third_party/crabbyavif
		third_party/crashpad
		third_party/crashpad/crashpad/third_party/lss
		third_party/crashpad/crashpad/third_party/zlib
	)
	use system-crc32c || keeplibs+=(
		third_party/crc32c
	)
	keeplibs+=(
		third_party/cros_system_api
		third_party/d3
		third_party/dawn
		third_party/dawn/third_party/gn/webgpu-cts
		third_party/dawn/third_party/OpenGL-Registry
		third_party/dawn/third_party/renderdoc
		third_party/dawn/third_party/webgpu-headers
		third_party/depot_tools
		third_party/devscripts
		third_party/devtools-frontend
		third_party/devtools-frontend/src/front_end/third_party/acorn
		third_party/devtools-frontend/src/front_end/third_party/additional_readme_paths.json
		third_party/devtools-frontend/src/front_end/third_party/axe-core
		third_party/devtools-frontend/src/front_end/third_party/chromium
		third_party/devtools-frontend/src/front_end/third_party/codemirror
		third_party/devtools-frontend/src/front_end/third_party/csp_evaluator
		third_party/devtools-frontend/src/front_end/third_party/diff
		third_party/devtools-frontend/src/front_end/third_party/i18n
		third_party/devtools-frontend/src/front_end/third_party/intl-messageformat
		third_party/devtools-frontend/src/front_end/third_party/json5
		third_party/devtools-frontend/src/front_end/third_party/legacy-javascript
		third_party/devtools-frontend/src/front_end/third_party/lighthouse
		third_party/devtools-frontend/src/front_end/third_party/lit
		third_party/devtools-frontend/src/front_end/third_party/marked
		third_party/devtools-frontend/src/front_end/third_party/puppeteer
		third_party/devtools-frontend/src/front_end/third_party/puppeteer/package/lib/esm/third_party/mitt
		third_party/devtools-frontend/src/front_end/third_party/puppeteer/package/lib/esm/third_party/parsel-js
		third_party/devtools-frontend/src/front_end/third_party/puppeteer/package/lib/esm/third_party/rxjs
		third_party/devtools-frontend/src/front_end/third_party/source-map-scopes-codec
		third_party/devtools-frontend/src/front_end/third_party/third-party-web
		third_party/devtools-frontend/src/front_end/third_party/vscode.web-custom-data
		third_party/devtools-frontend/src/front_end/third_party/wasmparser
		third_party/devtools-frontend/src/front_end/third_party/web-vitals
		third_party/devtools-frontend/src/third_party
		third_party/dom_distiller_js
		third_party/dragonbox
		third_party/eigen3
		third_party/emoji-segmenter
		third_party/farmhash
		third_party/fast_float
		third_party/fdlibm
		third_party/federated_compute/chromium/fcp/confidentialcompute
		third_party/federated_compute/src/fcp/base
		third_party/federated_compute/src/fcp/confidentialcompute
		third_party/federated_compute/src/fcp/protos/confidentialcompute
		third_party/federated_compute/src/fcp/protos/federatedcompute
		third_party/fft2d
		third_party/flatbuffers
		third_party/fp16
		third_party/freetype
		third_party/fusejs
		third_party/fxdiv
		third_party/gemmlowp
		third_party/google_input_tools
		third_party/google_input_tools/third_party/closure_library
		third_party/google_input_tools/third_party/closure_library/third_party/closure
		third_party/googletest
		third_party/gperf # We symlink system gperf, but this will purge the symlink since we tidy up afterwards.
		third_party/highway
		third_party/hunspell
		third_party/hyphenation-patterns
		third_party/ink_stroke_modeler/src/ink_stroke_modeler
		third_party/ink_stroke_modeler/src/ink_stroke_modeler/internal
		third_party/ink/src/ink/brush
		third_party/ink/src/ink/color
		third_party/ink/src/ink/geometry
		third_party/ink/src/ink/rendering
		third_party/ink/src/ink/rendering/skia/common_internal
		third_party/ink/src/ink/rendering/skia/native
		third_party/ink/src/ink/rendering/skia/native/internal
		third_party/ink/src/ink/strokes
		third_party/ink/src/ink/types
		third_party/inspector_protocol
		third_party/ipcz
		third_party/jinja2
	)
	use system-jsoncpp || keeplibs+=(
		third_party/jsoncpp
	)
	keeplibs+=(
		third_party/khronos
		third_party/lens_server_proto
		third_party/leveldatabase
		third_party/libaddressinput
	)
	use libcxx && keeplibs+=(
		third_party/libc++
	)
	keeplibs+=(
		third_party/libdrm
		third_party/libgav1
		third_party/libjingle
		third_party/libpfm4
		third_party/libphonenumber
		third_party/libpng
		third_party/libsecret
		third_party/libsrtp
		third_party/libsync
		third_party/libtess2/libtess2
		third_party/libtess2/src/Include
		third_party/libtess2/src/Source
		third_party/liburlpattern
	)
	use system-libusb || keeplibs+=(
		third_party/libusb
	)
	keeplibs+=(
		third_party/libva_protected_content
	)
	use system-libvpx || keeplibs+=(
		third_party/libvpx
		third_party/libvpx/source/libvpx/third_party/x86inc
	)
	keeplibs+=(
		third_party/libwebm
		third_party/libx11
		third_party/libxcb-keysyms
		third_party/libxml/chromium
		third_party/libyuv
		third_party/libzip
		third_party/lit
	)
	use libcxx && keeplibs+=(
		third_party/llvm-libc
		third_party/llvm-libc/src/shared/
	)
	keeplibs+=(
		third_party/lottie
		third_party/lss
		third_party/lzma_sdk
		third_party/mako
		third_party/markupsafe
		third_party/material_color_utilities
		third_party/metrics_proto
		third_party/minigbm
		third_party/ml_dtypes
		third_party/modp_b64
		third_party/nasm
		third_party/nearby
		third_party/neon_2_sse
		third_party/node
		third_party/oak/chromium/proto
		third_party/oak/chromium/proto/attestation
		third_party/omnibox_proto
		third_party/one_euro_filter
		third_party/openscreen
		third_party/openscreen/src/third_party/
		third_party/openscreen/src/third_party/tinycbor/src/src
		third_party/ots
		third_party/pdfium
		third_party/pdfium/third_party/agg23
		third_party/pdfium/third_party/bigint
		third_party/pdfium/third_party/freetype
		third_party/pdfium/third_party/lcms
	)
	use system-openjpeg || keeplibs+=(
		third_party/pdfium/third_party/libopenjpeg
	)
	keeplibs+=(
		third_party/pdfium/third_party/libtiff
		third_party/perfetto
		third_party/perfetto/protos/third_party/chromium
		third_party/perfetto/protos/third_party/pprof
		third_party/perfetto/protos/third_party/primes
		third_party/perfetto/protos/third_party/simpleperf
		third_party/pffft
		third_party/ply
		third_party/polymer
		third_party/private_membership
		third_party/private-join-and-compute
		third_party/protobuf
		third_party/protobuf/third_party/utf8_range
		third_party/pthreadpool
		third_party/puffin
		third_party/pyjson5
		third_party/pyyaml
		third_party/rapidhash
		third_party/readability
		third_party/rnnoise
		third_party/rust
		third_party/ruy
		third_party/s2cellid
		third_party/search_engines_data
		third_party/securemessage
		third_party/selenium-atoms
		third_party/sentencepiece
		third_party/sentencepiece/src/third_party/darts_clone
		third_party/shell-encryption
		third_party/simdutf
		third_party/simplejson
		third_party/six
		third_party/skia
		third_party/skia/include/third_party/vulkan
		third_party/smhasher
	)
	use system-snappy || keeplibs+=(
		third_party/snappy
	)
	keeplibs+=(
		third_party/spirv-headers
		third_party/spirv-tools
		third_party/sqlite
		third_party/swiftshader
		third_party/swiftshader/third_party/astc-encoder
		third_party/swiftshader/third_party/llvm-subzero
		third_party/swiftshader/third_party/marl
		third_party/swiftshader/third_party/SPIRV-Headers/include/spirv
		third_party/swiftshader/third_party/SPIRV-Tools
		third_party/swiftshader/third_party/subzero
		third_party/tensorflow_models
		third_party/tensorflow-text
		third_party/tflite
		third_party/tflite/src/third_party/fft2d
		third_party/tflite/src/third_party/xla/third_party/tsl
		third_party/tflite/src/third_party/xla/xla/tsl/framework
		third_party/tflite/src/third_party/xla/xla/tsl/lib/random
		third_party/tflite/src/third_party/xla/xla/tsl/platform
		third_party/tflite/src/third_party/xla/xla/tsl/protobuf
		third_party/tflite/src/third_party/xla/xla/tsl/util
		third_party/ukey2
		third_party/unrar
		third_party/utf
		third_party/vulkan
		third_party/wayland
		third_party/webdriver
		third_party/webgpu-cts
		third_party/webrtc
		third_party/webrtc/common_audio/third_party/ooura
		third_party/webrtc/common_audio/third_party/spl_sqrt_floor
		third_party/webrtc/modules/third_party/fft
		third_party/webrtc/modules/third_party/g711
		third_party/webrtc/modules/third_party/g722
		third_party/widevine
	)
	use system-woff2 || keeplibs+=(
		third_party/woff2
	)
	keeplibs+=(
		third_party/wuffs
		third_party/x11proto
		third_party/xcbproto
		third_party/xnnpack
		third_party/zlib/google
		third_party/zxcvbn-cpp
		url/third_party/mozilla
		v8/third_party/glibc
		v8/third_party/inspector_protocol
		v8/third_party/rapidhash-v8
		v8/third_party/siphash
		v8/third_party/utf8-decoder
		v8/third_party/v8
		v8/third_party/valgrind

		# gyp -> gn leftovers
		third_party/speech-dispatcher
		third_party/usb_ids
	)

	if use test; then
		keeplibs+=(
			third_party/breakpad/breakpad/src/processor
			third_party/fuzztest
			third_party/google_benchmark/src/include/benchmark
			third_party/google_benchmark/src/src
			third_party/test_fonts
			third_party/test_fonts/fontconfig
			third_party/test_fonts/test_fonts
		)
	fi

	# USE=system-*
	if ! use system-harfbuzz; then
		keeplibs+=( third_party/harfbuzz )
	fi

	if ! use system-ffmpeg; then
		keeplibs+=( third_party/ffmpeg third_party/opus )
	fi

	if ! use system-icu; then
		keeplibs+=( third_party/icu )
	fi

	if ! use system-zstd; then
		keeplibs+=( third_party/zstd )
	fi

	if ! use system-av1; then
		keeplibs+=(
			third_party/dav1d
			third_party/libaom
			third_party/libaom/source/libaom/third_party/fastfeat
			third_party/libaom/source/libaom/third_party/vector
			third_party/libaom/source/libaom/third_party/x86inc
		)
	fi

	if use libcxx; then
		keeplibs+=(
				third_party/libc++
				third_party/llvm-libc
		)
	fi

	if ! use system-openh264; then
		keeplibs+=( third_party/openh264 )
	fi

	if ! use system-re2; then
		keeplibs+=( third_party/re2 )
	fi

	# Arch-specific
	if use arm64 || use ppc64 ; then
		keeplibs+=( third_party/swiftshader/third_party/llvm-10.0 )
	fi
	# we need to generate ppc64 stuff because upstream does not ship it yet
	# it has to be done before unbundling.
	if use ppc64; then
		pushd third_party/libvpx >/dev/null || die
		mkdir -p source/config/linux/ppc64 || die
		# requires git and clang, bug #832803
		# Revert https://chromium.googlesource.com/chromium/src/+/b463d0f40b08b4e896e7f458d89ae58ce2a27165%5E%21/third_party/libvpx/generate_gni.sh
		# and https://chromium.googlesource.com/chromium/src/+/71ebcbce867dd31da5f8b405a28fcb0de0657d91%5E%21/third_party/libvpx/generate_gni.sh
		# since we're not in a git repo
		sed -i -e "s|^update_readme||g; s|clang-format|${EPREFIX}/bin/true|g; /^git -C/d; /git cl/d; /cd \$BASE_DIR\/\$LIBVPX_SRC_DIR/ign format --in-place \$BASE_DIR\/BUILD.gn\ngn format --in-place \$BASE_DIR\/libvpx_srcs.gni" \
			generate_gni.sh || die
		./generate_gni.sh || die
		popd >/dev/null || die

		pushd third_party/ffmpeg >/dev/null || die
		cp libavcodec/ppc/h264dsp.c libavcodec/ppc/h264dsp_ppc.c || die
		cp libavcodec/ppc/h264qpel.c libavcodec/ppc/h264qpel_ppc.c || die
		popd >/dev/null || die
	fi

	# Sanity check keeplibs, on major version bumps it is often necessary to update this list
	# and this enables us to hit them all at once.
	# There are some entries that need to be whitelisted (TODO: Why? The file is understandable, the rest seem odd)
	whitelist_libs=(
		net/third_party/quic
		third_party/devtools-frontend/src/front_end/third_party/additional_readme_paths.json
		third_party/libjingle
		third_party/mesa
		third_party/skia/third_party/vulkan
		third_party/vulkan
	)
	local not_found_libs=()
	for lib in "${keeplibs[@]}"; do
		if [[ ! -d "${lib}" ]] && ! has "${lib}" "${whitelist_libs[@]}"; then
			not_found_libs+=( "${lib}" )
		fi
	done

	if [[ ${#not_found_libs[@]} -gt 0 ]]; then
		ewarn "The following \`keeplibs\` directories were not found in the source tree:"
		for lib in "${not_found_libs[@]}"; do
			ewarn "  ${lib}"
		done
	fi

	keeplibs+=( third_party/ungoogled )

	# Remove most bundled libraries. Some are still needed.
	einfo "Unbundling third-party libraries ..."
	build/linux/unbundle/remove_bundled_libraries.py "${keeplibs[@]}" --do-remove || die

	# Interferes with our bundled clang path; we don't want stripped binaries anyway.
	sed -i -e 's|${clang_base_path}/bin/llvm-strip|/bin/true|g' \
		-e 's|${clang_base_path}/bin/llvm-objcopy|/bin/true|g' \
		build/linux/strip_binary.gni || die
}

src_configure() {
	# Calling this here supports resumption via FEATURES=keepwork
	python_setup

	# Bug 491582.
	export TMPDIR="${WORKDIR}/temp"
	mkdir -p -m 755 "${TMPDIR}" || die

	# https://bugs.gentoo.org/654216
	addpredict /dev/dri/ #nowarn

	# Use system-provided libraries.
	# TODO: freetype -- remove sources (https://bugs.chromium.org/p/pdfium/issues/detail?id=733).
	# TODO: use_system_hunspell (upstream changes needed).
	# TODO: use_system_protobuf (bug #525560).
	# TODO: use_system_sqlite (http://crbug.com/22208).

	# libevent: https://bugs.gentoo.org/593458
	local gn_system_libraries=(
		flac
		fontconfig
		freetype
		libjpeg
		libwebp
		libxml
		libxslt
		zlib
	)
	if use system-abseil-cpp; then
	gn_system_libraries+=(
		absl_algorithm
		absl_base
		absl_cleanup
		absl_container
		absl_crc
		absl_debugging
		absl_flags
		absl_functional
		absl_hash
		absl_log
		absl_log_internal
		absl_memory
		absl_meta
		absl_numeric
		absl_random
		absl_status
		absl_strings
		absl_synchronization
		absl_time
		absl_types
		absl_utility
	)
	fi
	if use system-brotli; then
		gn_system_libraries+=( brotli )
	fi
	if use system-crc32c; then
		gn_system_libraries+=( crc32c )
	fi
	if use system-double-conversion; then
		gn_system_libraries+=( double-conversion )
	fi
	if use system-woff2; then
		gn_system_libraries+=( woff2 )
	fi
	if use nvidia; then
		gn_system_libraries+=( libXNVCtrl )
	fi
	if use system-ffmpeg; then
		gn_system_libraries+=( ffmpeg opus )
	fi
	if use system-jsoncpp; then
		gn_system_libraries+=( jsoncpp )
	fi
	if use system-icu; then
		gn_system_libraries+=( icu )
	fi
	if use system-zstd; then
		gn_system_libraries+=( zstd )
	fi
	if use system-av1; then
		gn_system_libraries+=( dav1d libaom )
	fi
	if use system-libusb; then
		gn_system_libraries+=( libusb )
	fi
	if use system-libvpx; then
		gn_system_libraries+=( libvpx )
	fi
	use system-openh264 && gn_system_libraries+=(
		openh264
	)
	use system-re2 && gn_system_libraries+=(
		re2
	)
	use system-snappy && gn_system_libraries+=(
		snappy
	)

	build/linux/unbundle/replace_gn_files.py --system-libraries "${gn_system_libraries[@]}" ||
		die "Failed to replace GN files for system libraries"

	# TODO 131: The above call clobbers `enable_freetype = true` in the freetype gni file
	# drop the last line, then append the freetype line and a new curly brace to end the block
	local freetype_gni="build/config/freetype/freetype.gni"
	sed -i -e '$d' ${freetype_gni} || die
	echo "  enable_freetype = true" >> ${freetype_gni} || die
	echo "}" >> ${freetype_gni} || die

	if use !custom-cflags; then
		replace-flags "-Os" "-O2"
		strip-flags
		# Debug info section overflows without component build
		# Prevent linker from running out of address space, bug #471810 .
		filter-flags "-g*"
		# 949123: Several multimedia components explicitly build with specific CFLAGS and
		# use runtime detection to enable optimisations; unfortunately any of our CFLAGS are suffixed
		# to the end of the command line, which causes build failures.
		use arm64 && filter-flags "-march*" "-mtune*" "-mcpu*"
	fi

	# We don't use the same clang version as upstream, and with -Werror
	# we need to make sure that we don't get superfluous warnings.
	append-flags -Wno-unknown-warning-option
	if tc-is-cross-compiler; then # can you cross-compile with the bundled toolchain?
			export BUILD_CXXFLAGS+=" -Wno-unknown-warning-option"
			export BUILD_CFLAGS+=" -Wno-unknown-warning-option"
	fi

	# Start building our GN options
	local myconf_gn=() # Tip: strings must be quoted, bools or numbers are fine

	if use !bundled-toolchain; then
		# We already forced the "correct" clang via pkg_setup

		if tc-is-cross-compiler; then
			CC="${CC} -target ${CHOST} --sysroot ${ESYSROOT}"
			CXX="${CXX} -target ${CHOST} --sysroot ${ESYSROOT}"
			BUILD_AR=${AR}
			BUILD_CC=${CC}
			BUILD_CXX=${CXX}
			BUILD_NM=${NM}
		fi

		# Make sure the build system will use the right tools, bug #340795.
		tc-export AR CC CXX NM

		strip-unsupported-flags
		append-ldflags -Wl,--undefined-version # https://bugs.gentoo.org/918897#c32

		myconf_gn+=(
			"is_clang=true"
			"clang_use_chrome_plugins=false"
			"use_clang_modules=false" # M141 enables this for the linux platform by default.
			"use_lld=true"
			'custom_toolchain="//build/toolchain/linux/unbundle:default"'
			# From M127 we need to provide a location for libclang.
			# We patch this in for gentoo - see chromium-*-bindgen-custom-toolchain.patch
			# rust_bindgen_root = directory with `bin/bindgen` beneath it.
			# We don't need to set 'clang_base_path' for anything in our build
			# and it defaults to the google toolchain location. Instead provide a location
			# to where system clang lives so that bindgen can find system headers (e.g. stddef.h)
			"bindgen_libclang_path=\"$(get_llvm_prefix)/$(get_libdir)\""
			"clang_base_path=\"${EPREFIX}/usr/lib/clang/${LLVM_SLOT}/\""
			"rust_bindgen_root=\"${EPREFIX}/usr/\""
			"rust_sysroot_absolute=\"$(get_rust_prefix)\""
			"rustc_version=\"${RUST_SLOT}\""
		)

		if ! tc-is-cross-compiler; then
			myconf_gn+=( 'host_toolchain="//build/toolchain/linux/unbundle:default"' )
		else
			tc-export BUILD_{AR,CC,CXX,NM}
			myconf_gn+=(
				'host_toolchain="//build/toolchain/linux/unbundle:host"'
				'v8_snapshot_toolchain="//build/toolchain/linux/unbundle:host"'
				"host_pkg_config=\"$(tc-getBUILD_PKG_CONFIG)\""
				"pkg_config=\"$(tc-getPKG_CONFIG)\""
			)

			# setup cups-config, build system only uses --libs option
			if use cups; then
				mkdir "${T}/cups-config" || die
				cp "${ESYSROOT}/usr/bin/${CHOST}-cups-config" "${T}/cups-config/cups-config" || die
				export PATH="${PATH}:${T}/cups-config"
			fi

			# Don't inherit PKG_CONFIG_PATH from environment
			local -x PKG_CONFIG_PATH=
		fi

	fi # !bundled-toolchain

	local myarch
	myarch="$(tc-arch)"
	case ${myarch} in
		amd64)
			# Bug 530248, 544702, 546984, 853646.
			use !custom-cflags && filter-flags -mno-mmx -mno-sse2 -mno-ssse3 -mno-sse4.1 \
										-mno-avx -mno-avx2 -mno-fma -mno-fma4 -mno-xop -mno-sse4a
			myconf_gn+=( 'target_cpu="x64"' )
			;;
		x86)
			# Bug 530248, 544702, 546984, 853646.
			use !custom-cflags && filter-flags -mno-mmx -mno-sse2 -mno-ssse3 -mno-sse4.1 \
										-mno-avx -mno-avx2 -mno-fma -mno-fma4 -mno-xop -mno-sse4a
			myconf_gn+=( 'target_cpu="x86"' )
			;;
		arm64)
			myconf_gn+=( 'target_cpu="arm64"' )
			;;
		ppc64)
			myconf_gn+=( 'target_cpu="ppc64"' )
			;;
		*)
			die "Failed to determine target arch, got '${myarch}'."
			;;
	esac

	# Common options

	myconf_gn+=(
		# Disable code formating of generated files
		"blink_enable_generated_code_formatting=false"
		# enable DCHECK with USE=debug only, increases chrome binary size by 30%, bug #811138.
		# DCHECK is fatal by default, make it configurable at runtime, #bug 807881.
		"dcheck_always_on=$(usex debug true false)"
		"dcheck_is_configurable=$(usex debug true false)"
		# Chromium builds provided by Linux distros should disable the testing config
		"disable_fieldtrial_testing_config=true"
		# Custom patch: Enable building Chromium as individual channels (e.g. stable, beta, dev) that
		# use different profile directories, desktop entries, etc. This enables slotting the ebuild.
		"enable_channel_branding=true"
		# 131 began laying the groundwork for replacing freetype with
		# "Rust-based Fontations set of libraries plus Skia path rendering"
		# We now need to opt-in
		"enable_freetype=true"
		"enable_hangout_services_extension=$(usex hangouts true false)"
		# Don't need nocompile checks and GN crashes with our config (verify with modern GN)
		"enable_nocompile_tests=false"
		# pseudolocales are only used for testing
		"enable_pseudolocales=false"
		"enable_widevine=$(usex widevine true false)"
		# Disable fatal linker warnings, bug 506268.
		"fatal_linker_warnings=false"
		# Component build isn't generally intended for use by end users. It's mostly useful
		# for development and debugging.
		"is_component_build=false"
		# GN needs explicit config for Debug/Release as opposed to inferring it from build directory.
		"is_debug=false"
		"is_official_build=$(usex official true false)"
		# Enable ozone wayland and/or headless support
		"ozone_auto_platforms=false"
		"ozone_platform_headless=true"
		# Enables building without non-free unRAR licence
		"safe_browsing_use_unrar=false"
		# "thin_lto_enable_optimizations=${use_lto}"
		"treat_warnings_as_errors=false"
		# Use in-tree libc++ (buildtools/third_party/libc++ and buildtools/third_party/libc++abi)
		# instead of the system C++ library for C++ standard library support.
		# default: true, but let's be explicit (forced since 120 ; USE removed 127).
		"use_custom_libcxx=true"
		# Enable ozone wayland and/or headless support
		"use_ozone=true"
		# The sysroot is the oldest debian image that chromium supports, we don't need it
		"use_sysroot=false"
		# See dependency logic in third_party/BUILD.gn
		"use_system_harfbuzz=$(usex system-harfbuzz true false)"
		# "use_thin_lto=${use_lto}"
		# Only enabled for clang, but gcc has endian macros too
		"v8_use_libm_trig_functions=true"
	)

	myconf_gn+=( "enable_iterator_debugging=$(usex debug true false)" )

	if use debug; then
		myconf_gn+=(
			"symbol_level=2"
			"blink_symbol_level=2"
			"v8_symbol_level=2"
		)
	else
		myconf_gn+=(
			"symbol_level=0"
			"blink_symbol_level=0"
			"v8_symbol_level=0"
		)
	fi

	if use bindist ; then
		myconf_gn+=(
			# If this is set to false Chromium won't be able to load any proprietary codecs
			# even if provided with an ffmpeg capable of h264/aac decoding
			"proprietary_codecs=true"
			'ffmpeg_branding="Chrome"'
			# build ffmpeg as an external component (libffmpeg.so) that we can remove / substitute
			"is_component_ffmpeg=true"
		)
	else
		myconf_gn+=(
			"proprietary_codecs=$(usex proprietary-codecs true false)"
			"ffmpeg_branding=\"$(usex proprietary-codecs Chrome Chromium)\""
		)
	fi

	if use headless; then
		myconf_gn+=(
			"enable_print_preview=false"
			"enable_remoting=false"
			'ozone_platform="headless"'
			"rtc_use_pipewire=false"
			"use_alsa=false"
			"use_cups=false"
			"use_gio=false"
			"use_glib=false"
			"use_gtk=false"
			"use_kerberos=false"
			"use_libpci=false"
			"use_pangocairo=false"
			"use_pulseaudio=false"
			"use_qt5=false"
			"use_qt6=false"
			"use_udev=false"
			"use_vaapi=false"
			"use_xkbcommon=false"
		)
	else
		myconf_gn+=(
			"gtk_version=$(usex gtk4 4 3)"
			# link pulseaudio directly (DT_NEEDED) instead of using dlopen.
			# helps with automated detection of ABI mismatches and prevents silent errors.
			"link_pulseaudio=$(usex pulseaudio true false)"
			"ozone_platform_wayland=$(usex wayland true false)"
			"ozone_platform_x11=$(usex X true false)"
			"ozone_platform=\"$(usex wayland wayland x11)\""
			"rtc_use_pipewire=$(usex screencast true false)"
			"use_cups=$(usex cups true false)"
			"use_kerberos=$(usex kerberos true false)"
			"use_pulseaudio=$(usex pulseaudio true false)"
			"use_qt5=false"
			"use_system_libffi=$(usex wayland true false)"
			"use_system_minigbm=true"
			"use_vaapi=$(usex vaapi true false)"
			"use_xkbcommon=true"
		)
		if use qt6; then
			local cbuild_libdir
			cbuild_libdir="$(get_libdir)"
			if tc-is-cross-compiler; then
			# Hack to workaround get_libdir not being able to handle CBUILD, bug #794181
				cbuild_libdir="$($(tc-getBUILD_PKG_CONFIG) --keep-system-libs --libs-only-L libxslt)"
				cbuild_libdir="${cbuild_libdir:2}"
				cbuild_libdir="${cbuild_libdir/% }"
			fi
			myconf_gn+=(
				"use_qt6=true"
				"moc_qt6_path=\"${EPREFIX}/usr/${cbuild_libdir}/qt6/libexec\""
			)
		else
			myconf_gn+=( "use_qt6=false" )
		fi
	fi

	# Explicitly disable ICU data file support for system-icu/headless builds.
	if use system-icu || use headless; then
		myconf_gn+=( "icu_use_data_file=false" )
	fi

	if use official; then
		# Allow building against system libraries in official builds
		sed -i 's/OFFICIAL_BUILD/GOOGLE_CHROME_BUILD/' \
			tools/generate_shim_headers/generate_shim_headers.py || die
		# Don't add symbols to build
		myconf_gn+=( "symbol_level=0" )
	fi

	if use pgo; then
		myconf_gn+=(
				"chrome_pgo_phase=2"
				"v8_enable_builtins_optimization=true"
			)
	else
		myconf_gn+=( "chrome_pgo_phase=0" )
	fi

	# Odds and ends

	# skipping typecheck is only supported on amd64, bug #876157
	if ! use amd64; then
		myconf_gn+=( "devtools_skip_typecheck=false" )
	fi

	# Disable external code space for V8 for ppc64. It is disabled for ppc64
	# by default, but cross-compiling on amd64 enables it again.
	if tc-is-cross-compiler && use ppc64; then
		myconf_gn+=( "v8_enable_external_code_space=false" )
	fi

	# This determines whether or not GN uses the bundled libcxx
	if use libcxx; then
		myconf_gn+=( "use_custom_libcxx=true" )
	else
		myconf_gn+=(
			"use_custom_libcxx=false"
			"use_llvm_libatomic=false"
		)
		append-cppflags -U_GLIBCXX_ASSERTIONS #See #318
	fi

	myconf_gn+=( "use_bluez=$(usex bluetooth true false)" )

	myconf_gn+=( "is_cfi=$(usex cfi true false)" )

	if use cfi; then
		myconf_gn+=(
			"use_cfi_icall=true"
			"use_cfi_cast=true"
		)
	fi

	myconf_gn+=(
		"optimize_webui=$(usex optimize-webui true false)"
		"use_system_freetype=$(us