repo/gentoo:master commit in: www-client/chromium/

commit:     eb22b9e94827a50b03c7b401b4d1646f0065d691
Author:     Emi <emi <AT> genchu <DOT> org>
AuthorDate: Thu Aug 13 08:43:00 2026 +0000
Commit:     Matt Jolly <kangie <AT> gentoo <DOT> org>
CommitDate: Tue Aug 18 08:48:24 2026 +0000
URL:        https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=eb22b9e9

www-client/chromium: add 151.0.7922.137

Bug: https://bugs.gentoo.org/980799
Closes: https://bugs.gentoo.org/980645
Signed-off-by: Emi <emi <AT> genchu.org>
Part-of: https://github.com/gentoo/gentoo/pull/46681
Closes: https://github.com/gentoo/gentoo/pull/46681
Signed-off-by: Matt Jolly <kangie <AT> gentoo.org>

 www-client/chromium/Manifest                       |    1 +
 www-client/chromium/chromium-151.0.7922.137.ebuild | 1872 ++++++++++++++++++++
 2 files changed, 1873 insertions(+)

diff --git a/www-client/chromium/Manifest b/www-client/chromium/Manifest
index 15bbb495ce4b..ff889844659b 100644
--- a/www-client/chromium/Manifest
+++ b/www-client/chromium/Manifest
@@ -4,6 +4,7 @@ DIST chromium-150.0.7871.181-linux.tar.xz 1668476496 BLAKE2B 9d6fb2cc9a12c935f16
 DIST chromium-150.0.7871.186-linux.tar.xz 1668494832 BLAKE2B 8edda676c99dab33bab5ffe6c87bcb5bc3066ee9f7bb36d1a0d0aa7b58e4009f35f4d7e4776a9d80722b54429931d6c1720c77284f2877cf925a6275d38b9dd2 SHA512 e1ee5851277c5a32d89a021b8f20736dfeab1bd046f6dbfa8d22137ff5366119cc845cdb8f87ce42a26d48703734984db4181dfa219dba093a52915f5be9976f
 DIST chromium-151.0.7872.0-linux.tar.xz 1673299600 BLAKE2B 6a2b0da9238c03fba9360b2575def84c0efd90a110ce5d08b9f86eeb1027acf96902ba76e30329b4a871ad4dc9897159bc1920d615147253b7558af12dd2d4a7 SHA512 0afe87ad10b28b01974b8154edd50b735a96e692811fd7af66ca62cd5e74292f22bbbdcc5e7ff5310c6c1ab31d62a18dd4421ee9b0366c6a9c5170307e80acbc
 DIST chromium-151.0.7922.108-linux.tar.xz 1711846220 BLAKE2B c3cfc831e42469d3e8aa42c1d8709f34353d2964c94d06247418fd246bb4b5d6b68cb9266860f14947d1673ea922cd0868018b722a79a82538ad476004a45142 SHA512 b5e63e6ebd554a4f38889450bc42e2ff9bb60a5c85c98840b871e8efa498a4d0e96db18c8240d425d8883c00f3219346736a98c655fe3f3609cace079cc765d9
+DIST chromium-151.0.7922.137-linux.tar.xz 1711946116 BLAKE2B 2bb21793c3da2ea802485d2dae324a86eeca2f9fb3e7b77294f78e41097effd4e37febd37133123e85531c1c2f0f5499443f90adb7a754545765880a460011c2 SHA512 379dede0ca1ae3137e67776608a1b899ecdfa2c5c566df92841f63f1643dbe09d021df05a6a2d1fd853fb7d0fab95e2fea6a4568c18a94fdb84758e0f668f68b
 DIST chromium-clang-llvmorg-23-init-10931-g20b6ec66-11.tar.xz 69635068 BLAKE2B 5250889dac7ca048030266b9e5eb9b08a1288acb1023fff3513555ca361f787fdb273b04d5cb5cc9960d7d13e804604ca63e65b056d1873a8f5e1d56e8f59db8 SHA512 4a1f06bacfb5894e277f3957df3adcc937f262ec91927d6fd97a2e4b88b795e2559a8498be633d6b191dd4d52a5df52669f76c59c2939689f5f88fc7457cabae
 DIST chromium-clang-llvmorg-23-init-19482-g53d18800-1.tar.xz 59093892 BLAKE2B faf8c5011b0271903a9a09a4539002088030eac34ac01c4b84581a556f761f89eac035feda5b97be350679325968db99face036c201972b01dd081ced3468edc SHA512 5d88f1ed4901c80963b6740c9b15a28c33db397f8bf31503502b00caff172e17d37f7b946da31162e04794fee763e0b7456a9fc476827c8a19cdd1e737b9b68a
 DIST chromium-openpower-7aae8a84e3.tar.bz2 441026 BLAKE2B efceb75ba53899388398a4564ef29c9fe66427e160a3e7f3375fd3eec8d1ffef335ca14865c11510e9c3719daab11dfb0954ed4a7b847dee602773d51f5e1e0f SHA512 cbe75ae78226b784904a263f7eb01e44faab71efb4a35ca46ff551ff17c0c5f1cdd8f839313ad3bb678b6ca56e4d95899f7802a548ffe7bb90582d9df5614c21

diff --git a/www-client/chromium/chromium-151.0.7922.137.ebuild b/www-client/chromium/chromium-151.0.7922.137.ebuild
new file mode 100644
index 000000000000..7b7db328bbb1
--- /dev/null
+++ b/www-client/chromium/chromium-151.0.7922.137.ebuild
@@ -0,0 +1,1872 @@
+# Copyright 2009-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+# PACKAGING NOTES
+
+# Upstream roll their bundled Clang every two weeks, and the bundled Rust
+# is rolled regularly and depends on that. While we do our best to build
+# with system Clang, we may eventually hit the point where we need to use
+# the bundled Clang due to the use of prerelease features.
+
+# 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=0.2374
+# 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="9c07d19d9c5ee1ff94f717e6fb17e0c8c354e6f9"
+BUNDLED_CLANG_VER="llvmorg-23-init-19482-g53d18800-1"
+BUNDLED_RUST_VER="b998449636a48e2c4a362809085b600a0174e1f2-2"
+RUST_SHORT_HASH=${BUNDLED_RUST_VER:0:10}-${BUNDLED_RUST_VER##*-}
+NODE_VER="24.16.0-r1"
+GO_MIN_VER="1.25.0"
+ESBUILD_VER="0.25.1"
+ROLLUP_VER="4.57.1" # currently manual.
+VIRTUALX_REQUIRED="pgo"
+
+CHROMIUM_LANGS="af am ar bg bn ca cs da de el en-GB es es-419 et fa fi fil fr gu he
+	hi hr hu id it ja kn ko lt lv ml mr ms nb nl pl pt-BR pt-PT ro ru sk sl sr
+	sv sw ta te th tr uk ur vi zh-CN zh-TW"
+
+LLVM_COMPAT=( 21 )
+PYTHON_COMPAT=( python3_{11..14} )
+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 virtualx xdg-utils
+
+DESCRIPTION="Open-source version of Google Chrome web browser"
+HOMEPAGE="https://www.chromium.org/"
+PPC64_HASH="7aae8a84e327fc2078ce1625c9c70bfda77d626f"
+PATCH_V="151-3"
+COPIUM_COMMIT="3c7e56fb4523b43b47595bb3a22f77178fc76293"
+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
+	)
+	pgo? ( https://github.com/elkablo/chromium-profiler/releases/download/v0.2/chromium-profiler-0.2.tar )"
+
+# 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+=" rar? ( unRAR )"
+
+SLOT="stable"
+KEYWORDS="~amd64 ~arm64"
+
+IUSE_SYSTEM_LIBS="+system-harfbuzz +system-icu +system-zstd"
+IUSE="+X ${IUSE_SYSTEM_LIBS} bindist bundled-toolchain cups debug ffmpeg-chromium gtk4 +hangouts headless kerberos +official pax-kernel pgo"
+IUSE+=" +proprietary-codecs pulseaudio qt6 +rar +screencast selinux test +vaapi +wayland +widevine cpu_flags_ppc_vsx3"
+RESTRICT="
+	!bindist? ( bindist )
+	!test? ( test )
+	arm64? ( test )" # Tests require CFI, which requires LTO, which is broken on arm64 with LLVM 21.
+
+REQUIRED_USE="
+	!headless? ( || ( X wayland ) )
+	pgo? ( X !wayland )
+	screencast? ( wayland )
+	ffmpeg-chromium? ( bindist proprietary-codecs )
+"
+
+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-73.0:= )
+	>=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:=
+	system-zstd? ( >=app-arch/zstd-1.5.5:= )
+	>=media-libs/libwebp-0.4.0:=
+	media-libs/mesa:=[gbm(+)]
+	>=media-libs/openh264-2.6.0:=
+	sys-libs/zlib:=
+	!headless? (
+		dev-libs/glib:2
+		>=media-libs/alsa-lib-1.0.19:=
+		media-video/pipewire:=
+		pulseaudio? ( media-libs/libpulse:= )
+		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? (
+			screencast? ( media-video/pipewire:= )
+			dev-libs/libffi:=
+			dev-libs/wayland:=
+		)
+	)
+"
+
+COMMON_DEPEND="
+	${COMMON_SNAPSHOT_DEPEND}
+	app-arch/bzip2:=
+	dev-libs/expat:=
+	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? ( ${COMMON_X_DEPEND} )
+	)
+"
+RDEPEND="${COMMON_DEPEND}
+	!www-client/chromium:0
+	>=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-6.1-r1:0/58.60.60[chromium] )
+		ffmpeg-chromium? ( media-video/ffmpeg-chromium:${PV%%\.*} )
+	)
+"
+# For M149+ pipewire is a mandatory build-time dependency, but it's optional at runtime for most configurations.
+DEPEND="${COMMON_DEPEND}
+	!headless? (
+		media-video/pipewire
+		gtk4? ( gui-libs/gtk:4[X?,wayland?] )
+		!gtk4? ( x11-libs/gtk+:3[X?,wayland?] )
+	)
+"
+
+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:${LLVM_SLOT}
+		official? (
+			!ppc64? ( llvm-runtimes/compiler-rt-sanitizers:${LLVM_SLOT}[cfi] )
+		) ')
+		|| (
+			$(llvm_gen_dep 'llvm-core/lld:${LLVM_SLOT}')
+			>=sys-devel/mold-2.41.0
+		)
+		!official? ( >=sys-devel/mold-2.41.0 )
+		${RUST_DEPEND}
+	)
+	pgo? (
+		>=dev-python/selenium-3.141.0
+		>=dev-util/web_page_replay_go-20220314
+	)
+	>=dev-util/bindgen-0.72.1
+	>=dev-build/gn-${GN_MIN_VER}
+	>=dev-lang/go-${GO_MIN_VER}
+	app-alternatives/ninja
+	dev-lang/perl
+	>=dev-util/gperf-3.2
+	dev-util/esbuild:${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 ${EBUILD_DEATH_HOOKS}; then
+	EBUILD_DEATH_HOOKS+=" chromium_pkg_die";
+fi
+
+DISABLE_AUTOFORMATTING="yes"
+DOC_CONTENTS="
+Some web pages may require additional fonts to display properly.
+Try installing some of the following packages if some characters
+are not displayed properly:
+- media-fonts/arphicfonts
+- media-fonts/droid
+- media-fonts/ipamonafont
+- media-fonts/noto
+- media-fonts/ja-ipafonts
+- media-fonts/takao-fonts
+- media-fonts/wqy-microhei
+- media-fonts/wqy-zenhei
+
+To fix broken icons on the Downloads page, you should install an icon
+theme that covers the appropriate MIME types, and configure this as your
+GTK+ icon theme.
+
+For native file dialogs in KDE, install kde-apps/kdialog.
+
+To make password storage work with your desktop environment you may
+have install one of the supported credentials management applications:
+- app-crypt/libsecret (GNOME)
+- kde-frameworks/kwallet (KDE)
+If you have one of above packages installed, but don't want to use
+them in Chromium, then add --password-store=basic to CHROMIUM_FLAGS
+in /etc/chromium/default.
+"
+
+python_check_deps() {
+	python_has_version "dev-python/setuptools[${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
+}
+
+pkg_setup() {
+	if [[ ${MERGE_TYPE} != binary ]]; then
+		# The pre_build_checks are all about compilation resources, no need to run it for a binpkg
+		pre_build_checks
+
+		# We haven't massaged any CFLAGS yet, so we want to do this before we force CC/CXX to prevent warnings.
+		local want_lto="false"
+		tc-is-lto && want_lto="true"
+
+		# The linux:unbundle toolchain in GN grabs CC, CXX, CPP (etc) from the environment
+		# We'll set these to clang here then use llvm-utils functions to very explicitly set these
+		# to a sane value.
+		# This is effectively the 'force-clang' path if GCC support is re-added.
+		if use !bundled-toolchain; then
+			llvm-r1_pkg_setup
+			rust_pkg_setup
+
+			if tc-ld-is-mold; then
+				ewarn "Mold is currently not supported, it will not be used"
+			fi
+
+			# Forcing clang; respect llvm_slot_x to enable selection of impl via LLVM_COMPAT
+			AR=llvm-ar
+			CPP="${CHOST}-clang++-${LLVM_SLOT} -E"
+			NM=llvm-nm
+			CC="${CHOST}-clang-${LLVM_SLOT}"
+			CXX="${CHOST}-clang++-${LLVM_SLOT}"
+		fi
+
+		# LTO in Chromium means LLVM ThinLTO, if GCC support is re-added
+		# We'll need to handle that here too.
+		use_lto="false"
+		local lto_usable="true"
+		if [[ "$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
+
+		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
+
+		# I hate doing this but upstream Rust have yet to come up with a better solution for
+		# us poor packagers. Required for Split LTO units, which are required for CFI.
+		export RUSTC_BOOTSTRAP=1
+
+		# Sanity checks for development convenience
+		if ver_test $(gn --version || die) -lt ${GN_MIN_VER}; then
+			die "dev-build/gn >= ${GN_MIN_VER} is required to build this Chromium"
+		fi
+
+		# Sometimes, when adding a new LLVM slot, devs (me) forget to install an appropriate lld.
+		if tc-ld-is-lld; then
+			local lld_ver=$(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
+	fi
+
+	chromium_suid_sandbox_check_kernel_config
+}
+
+src_unpack() {
+	unpack ${P}-linux.tar.xz
+	unpack chromium-patches-${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-${COPIUM_COMMIT:0:10}.tar.gz
+	fi
+
+	use pgo && unpack chromium-profiler-0.2.tar
+
+	if use test; then
+		# This just contains a bunch of font files that need to be unpacked (or moved) to the correct location.
+		local testfonts_dir="${WORKDIR}/${P}/third_party/test_fonts/test_fonts"
+		local testfonts_tar="${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-${ROLLUP_VER}.tgz
+}
+
+remove_compiler_builtins() {
+	# We can't use the bundled compiler builtins with the system toolchain
+	# We used to `grep` then `sed`, but it was indirect. Combining the two into a single
+	# `awk` command is more efficient and lets us document the logic more clearly.
+
+	local pattern='    configs += [ "//build/config/clang:compiler_builtins" ]'
+	local target='build/config/compiler/BUILD.gn'
+
+	local tmpfile
+	tmpfile=$(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 ${target}."
+	fi
+}
+
+src_prepare() {
+	# Calling this here supports resumption via FEATURES=keepwork
+	python_setup
+
+	# We'll fill this in as we go. Patches go in chromium-patches.
+	local PATCHES=()
+
+	PATCHES+=(
+		"${WORKDIR}/chromium-patches-${PATCH_V}/common/"
+	)
+
+	# So many fontconfig magic numbers to cover
+	# TODO: once upstream roll to 2.18.2+ set that as our minimum and remove this logic.
+	# <=2.17.1 -> 9
+	# >2.17.1 && <2.18.2 -> 11
+	# >=2.18.2 -> 12
+	local fontconfig_cache_magic=9
+	if has_version ">=media-libs/fontconfig-2.18.2"; then
+		fontconfig_cache_magic=12
+	elif has_version ">media-libs/fontconfig-2.17.1"; then
+		fontconfig_cache_magic=11
+	fi
+
+	sed -E -i \
+		-e "s#(fb5c91b2895aa445d23aebf7f9e2189c-le64\.cache-)(9|10|11|12)#\1${fontconfig_cache_magic}#g" \
+		third_party/test_fonts/fontconfig/BUILD.gn || die "Failed to set fontconfig cache magic in BUILD.gn"
+
+	sed -E -i \
+		-e "s#(kCacheKey \+ \"/-le64\.cache-)(9|10|11|12)(\")#\1${fontconfig_cache_magic}\3#g" \
+		-e "s#(kCacheKey \+ \"-le64\.cache-)(9|10|11|12)(\")#\1${fontconfig_cache_magic}\3#g" \
+		third_party/test_fonts/fontconfig/generate_fontconfig_caches.cc || \
+			die "Failed to set fontconfig cache magic in generate_fontconfig_caches.cc"
+
+	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+=(
+			"${WORKDIR}/copium/cr143-libsync-__BEGIN_DECLS.patch"
+			"${WORKDIR}/copium/cr149-unbundle-minizip-undo-unicode.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
+			local category_patches=( "${category}"*.patch )
+			[[ ${#category_patches[@]} -gt 0 ]] && PATCHES+=( "${category}" )
+
+			# 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+=( "${constraint_dir}" )
+				fi
+			done
+		done
+
+		shopt -u nullglob
+
+		# Strictly speaking this doesn't need to be gated (no bundled toolchain for ppc64); it keeps the logic together
+		if use ppc64; then
+			local patchset_dir="${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"
+
+	default
+
+	# 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
+	sed 's|//third_party/usb_ids/src/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
+		base/third_party/double_conversion
+		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
+		net/third_party/mozilla_security_manager
+		net/third_party/quic
+		net/third_party/uri_template
+		third_party/abseil-cpp
+		third_party/angle
+		third_party/angle/src/common/third_party/xxhash
+		third_party/angle/src/third_party/ceval
+		third_party/angle/src/third_party/libXNVCtrl
+		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
+		third_party/brotli
+		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
+		third_party/compiler-rt # Since M137 atomic is required; we could probably unbundle this as a target of opportunity.
+		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
+		third_party/crc32c
+		third_party/cros_system_api
+		third_party/d3
+		third_party/dav1d
+		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/third_party/mitt
+		third_party/devtools-frontend/src/front_end/third_party/puppeteer/package/lib/third_party/parsel-js
+		third_party/devtools-frontend/src/front_end/third_party/puppeteer/package/lib/third_party/rxjs
+		third_party/devtools-frontend/src/front_end/third_party/puppeteer/package/lib/third_party/urlpattern-polyfill
+		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/chromium/fcp/protos
+		third_party/federated_compute/chromium/fcp/secagg
+		third_party/federated_compute/chromium/fcp/client
+		third_party/federated_compute/src/fcp/base
+		third_party/federated_compute/src/fcp/confidentialcompute
+		third_party/federated_compute/src/fcp/protos
+		third_party/federated_compute/src/fcp/client
+		third_party/federated_compute/src/fcp/secagg
+		third_party/federated_compute/third_party/googleapis/src/google
+		third_party/federated_compute/third_party/tensorflow-federated
+		third_party/federated_compute/third_party/protodatastore-cpp
+		third_party/ffmpeg
+		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/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
+		third_party/jsoncpp
+		third_party/khronos
+		third_party/lens_server_proto
+		third_party/leveldatabase
+		third_party/libaddressinput
+		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
+		third_party/libc++
+		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
+		third_party/libva_protected_content
+		third_party/libvpx
+		third_party/libvpx/source/libvpx/third_party/x86inc
+		third_party/libwebm
+		third_party/libx11
+		third_party/libxcb-keysyms
+		third_party/libxml/chromium
+		third_party/libyuv
+		third_party/libzip
+		third_party/lit
+		third_party/llvm-libc
+		third_party/llvm-libc/src/shared/
+		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/opus
+		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
+		third_party/pdfium/third_party/libopenjpeg
+		third_party/pdfium/third_party/libtiff
+		third_party/perfetto
+		third_party/perfetto/protos/third_party/android
+		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/re2
+		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
+		third_party/snappy
+		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/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
+		third_party/woff2
+		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 rar; then
+		keeplibs+=( third_party/unrar )
+	fi
+
+	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-icu; then
+		keeplibs+=( third_party/icu )
+	fi
+
+	if ! use system-zstd; then
+		keeplibs+=( third_party/zstd )
+	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 [[ ${#not_found_libs[@]} -gt 0 ]]; then
+		eerror "The following \`keeplibs\` directories were not found in the source tree:"
+		for lib in "${not_found_libs[@]}"; do
+			eerror "  ${lib}"
+		done
+		die "Please update the ebuild."
+	fi
+
+	# Remove most bundled libraries. Some are still needed.
+	einfo "Unbundling third-party libraries ..."
+	build/linux/unbundle/remove_bundled_libraries.py "${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
+
+	if ! use official; then
+		ln -s /usr/bin/mold buildtools/third_party/mold/cipd/mold || die
+	fi
+}
+
+chromium_configure() {
+	# Calling this here supports resumption via FEATURES=keepwork
+	python_setup
+
+	# 974899: sometimes people try to build with a non-Unicode locale and python gets very upset
+	python_export_utf8_locale || die "Chromium builds require a UTF-8 locale."
+
+	# 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
+		# Need harfbuzz_from_pkgconfig target
+		#harfbuzz-ng
+		libjpeg
+		libwebp
+		libxml
+		libxslt
+		openh264
+		zlib
+	)
+
+	if use system-icu; then
+		gn_system_libraries+=( icu )
+	fi
+
+	if use system-zstd; then
+		gn_system_libraries+=( zstd )
+	fi
+
+	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 "}" >> ${freetype_gni} || die
+
+	if use !custom-cflags; then
+		replace-flags "-Os" "-O2"
+		strip-flags
+		# Debug info section overflows without component build
+		# Prevent linker from running out of address space, bug #471810 .
+		filter-flags "-g*"
+		# 949123: Several multimedia components explicitly build with specific CFLAGS and
+		# use runtime detection to enable optimisations; unfortunately any of our CFLAGS are suffixed
+		# to the end of the command line, which causes build failures.
+		# Since M150 `skia` will begin breaking for x86_64 due to compilation of `avx512` code paths;
+		# we need to filter these for all arches.
+		filter-flags "-march*" "-mtune*" "-mcpu*"
+
+	fi
+
+	# We don't use the same clang version as upstream, and with -Werror
+	# we need to make sure that we don't get superfluous warnings.
+	append-flags -Wno-unknown-warning-option
+	if tc-is-cross-compiler; then # can you cross-compile with the bundled toolchain?
+			export BUILD_CXXFLAGS+=" -Wno-unknown-warning-option"
+			export BUILD_CFLAGS+=" -Wno-unknown-warning-option"
+	fi
+
+	# Start building our GN options
+	local myconf_gn=() # Tip: strings must be quoted, bools or numbers are fine
+
+	if use !bundled-toolchain; then
+		# We already forced the "correct" clang via pkg_setup
+
+		if tc-is-cross-compiler; then
+			CC="${CC} -target ${CHOST} --sysroot ${ESYSROOT}"
+			CXX="${CXX} -target ${CHOST} --sysroot ${ESYSROOT}"
+			BUILD_AR=${AR}
+			BUILD_CC=${CC}
+			BUILD_CXX=${CXX}
+			BUILD_NM=${NM}
+		fi
+
+		# Make sure the build system will use the right tools, bug #340795.
+		tc-export AR CC CXX NM
+
+		strip-unsupported-flags
+		append-ldflags -Wl,--undefined-version # https://bugs.gentoo.org/918897#c32
+
+		myconf_gn+=(
+			"is_clang=true"
+			"clang_use_chrome_plugins=false"
+			"use_clang_modules=false" # M141 enables this for the linux platform by default.
+			'custom_toolchain="//build/toolchain/linux/unbundle:default"'
+			# From M127 we need to provide a location for libclang and the clang resource dir so that bindgen can find them
+			"bindgen_libclang_path=\"$(get_llvm_prefix)/$(get_libdir)\""
+			"bindgen_clang_resource_dir=\"${EPREFIX}/usr/lib/clang/${LLVM_SLOT}/include\""
+			"bindgen_extra_clang_args=[\"-I${EPREFIX}/usr/lib/clang/${LLVM_SLOT}/include\"]"
+			"clang_base_path=\"${EPREFIX}/usr/lib/clang/${LLVM_SLOT}/\""
+			"rust_bindgen_root=\"${EPREFIX}/usr/\""
+			"rust_sysroot_absolute=\"$(get_rust_prefix)\""
+			"rustc_version=\"${RUST_SLOT}\""
+		)
+
+		# Currently disabled, runtime issues with mold
+		#if tc-ld-is-mold; then
+		#	myconf_gn+=(
+		#		"use_mold=true"
+		#		"use_lld=false"
+		#		"linker_path=\"${EPREFIX}/usr/bin/mold\""
+		#	)
+		#else
+		myconf_gn+=( "use_lld=true" )
+		#fi
+
+		if [[ ${LLVM_SLOT} -lt 23 ]]; then
+			# Workaround for -fsanitize-ignore-for-ubsan-feature (added in LLVM 23)
+			myconf_gn+=( 'clang_has_ubsan_feature_ignore=false' )
+		fi
+
+		if ! tc-is-cross-compiler; then
+			myconf_gn+=( 'host_toolchain="//build/toolchain/linux/unbundle:default"' )
+		else
+			tc-export BUILD_{AR,CC,CXX,NM}
+			myconf_gn+=(
+				'host_toolchain="//build/toolchain/linux/unbundle:host"'
+				'v8_snapshot_toolchain="//build/toolchain/linux/unbundle:host"'
+				"host_pkg_config=\"$(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 ${myarch} in
+		amd64)
+			# Bug 530248, 544702, 546984, 853646.
+			use !custom-cflags && filter-flags -mno-mmx -mno-sse2 -mno-ssse3 -mno-sse4.1 \
+										-mno-avx -mno-avx2 -mno-fma -mno-fma4 -mno-xop -mno-sse4a
+			myconf_gn+=( 'target_cpu="x64"' )
+			;;
+		arm64)
+			myconf_gn+=( 'target_cpu="arm64"' )
+			;;
+		ppc64)
+			myconf_gn+=( 'target_cpu="ppc64"' )
+			;;
+		*)
+			die "Failed to determine target arch, got '${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"
+		# Set up Google API keys, see http://www.chromium.org/developers/how-tos/api-keys
+		# Note: these are for Gentoo use ONLY. For your own distribution,
+		# please get your own set of keys. Feel free to contact [email protected] for more info.
+		# note: OAuth2 is patched in; check patchset for details.
+		'google_api_key="AIzaSyDEAOvatFo0eTgsV_ZlEzx0ObmepsMzfAc"'
+		# 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=$(usex official true false)"
+		# Enable ozone wayland and/or headless support
+		"ozone_auto_platforms=false"
+		"ozone_platform_headless=true"
+		# Enables building without non-free unRAR licence
+		"safe_browsing_use_unrar=$(usex rar true 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=${use_lto}"
+		# Only enabled for clang, but gcc has endian macros too
+		"v8_use_libm_trig_functions=true"
+		# use system go
+		"tint_use_system_go=true"
+	)
+
+	if use bindist ; then
+		myconf_gn+=(
+			# If this is set to false Chromium won't be able to load any proprietary codecs
+			# even if provided with an ffmpeg capable of h264/aac decoding
+			"proprietary_codecs=true"
+			'ffmpeg_branding="Chrome"'
+			# build ffmpeg as an external component (libffmpeg.so) that we can remove / substitute
+			"is_component_ffmpeg=true"
+		)
+	else
+		myconf_gn+=(
+			"proprietary_codecs=$(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=$(usex screencast true false)"
+			# As above - link directly instead of dlopening
+			"rtc_link_pipewire=$(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
+		if use !ppc64; then
+			myconf_gn+=( "is_cfi=${use_lto}" )
+		else
+			myconf_gn+=( "is_cfi=false" ) # requires llvm-runtimes/compiler-rt-sanitizers[cfi]
+		fi
+		# Don't add symbols to build
+		myconf_gn+=( "symbol_level=0" )
+	fi
+
+	if use pgo; then
+		myconf_gn+=( "chrome_pgo_phase=${1}" )
+		if [[ "$1" == "2" ]]; then
+			myconf_gn+=( "pgo_data_path=${2}" )
+		fi
+	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
+
+	# Since we build from tarballs, we need to set the channel here so that it can be used in the build.
+	export CHROME_VERSION_EXTRA="${SLOT}"
+
+	einfo "Configuring Chromium ..."
+	# add a `-v` here if gn `hangs` to see which file it's getting stuck on.
+	set -- gn gen --args="${myconf_gn[*]}${EXTRA_GN:+ ${EXTRA_GN}}" out/Release
+	echo "$@"
+	"$@" || die "Failed to configure Chromium"
+}
+
+src_configure() {
+	chromium_configure $(usex pgo 1 0)
+}
+
+chromium_compile() {
+
+	# Final link uses lots of file descriptors.
+	ulimit -n 2048
+
+	# Calling this here supports resumption via FEATURES=keepwork
+	python_setup
+
+	# Don't inherit PYTHONPATH from environment, bug #789021, #812689
+	local -x PYTHONPATH=
+
+	# Build mksnapshot and pax-mark it.
+	if use pax-kernel; then
+		local x
+		for x in mksnapshot v8_context_snapshot_generator code_cache_generator; do
+			if tc-is-cross-compiler; then
+				eninja -C out/Release "host/${x}"
+				pax-mark m "out/Release/host/${x}"
+			else
+				eninja -C out/Release "${x}"
+				pax-mark m "out/Release/${x}"
+			fi
+		done
+	fi
+
+	# Even though ninja autodetects number of CPUs, we respect
+	# user's options, for debugging with -j 1 or any other reason.
+	eninja -C out/Release chrome chromedriver chrome_sandbox $(use test && echo "base_unittests")
+
+	pax-mark m out/Release/chrome
+
+	# This codepath does minimal patching, so we're at the mercy of upstream
+	# CFLAGS. This is fine - we're not intending to force this on users
+	# and we do a lot of flag 'management' anyway.
+	if use bundled-toolchain; then
+		QA_FLAGS_IGNORED="
+			usr/lib64/chromium-browser/chrome
+			usr/lib64/chromium-browser/chrome-sandbox
+			usr/lib64/chromium-browser/chromedriver
+			usr/lib64/chromium-browser/chrome_crashpad_handler
+			usr/lib64/chromium-browser/libEGL.so
+			usr/lib64/chromium-browser/libGLESv2.so
+			usr/lib64/chromium-browser/libVkICD_mock_icd.so
+			usr/lib64/chromium-browser/libVkLayer_khronos_validation.so
+			usr/lib64/chromium-browser/libqt6_shim.so
+			usr/lib64/chromium-browser/libvk_swiftshader.so
+			usr/lib64/chromium-browser/libvulkan.so.1
+		"
+	fi
+}
+
+# This function is called from virtx, and must always return so that Xvfb
+# session isn't left running. If we return 1, virtx will call die().
+chromium_profile() {
+	einfo "Profiling for PGO"
+
+	pushd "${WORKDIR}/chromium-profiler-"* >/dev/null || return 1
+
+	# Remove old profdata in case profiling was interrupted.
+	rm -rf "${1}" || return 1
+
+	if ! "${EPYTHON}" ./chromium_profiler.py \
+		--chrome-executable "${S}/out/Release/chrome" \
+		--chromedriver-executable "${S}/out/Release/chromedriver.unstripped" \
+		--add-arg no-sandbox --add-arg disable-dev-shm-usage \
+		--profile-output "${1}"; then
+		eerror "Profiling failed"
+		return 1
+	fi
+
+	popd >/dev/null || return 1
+}
+
+src_compile() {
+	if use pgo; then
+		local profdata
+
+		profdata="${WORKDIR}/chromium.profdata"
+
+		if [[ ! -e "${WORKDIR}/.pgo-profiled" ]]; then
+			chromium_compile
+			virtx chromium_profile "$profdata"
+
+			touch "${WORKDIR}/.pgo-profiled" || die
+		fi
+
+		if [[ ! -e "${WORKDIR}/.pgo-phase-2-configured" ]]; then
+			# Remove phase 1 output
+			rm -r out/Release || die
+
+			chromium_configure 2 "$profdata"
+
+			touch "${WORKDIR}/.pgo-phase-2-configured" || die
+		fi
+
+		if [[ ! -e "${WORKDIR}/.pgo-phase-2-compiled" ]]; then
+			chromium_compile
+			touch "${WORKDIR}/.pgo-phase-2-compiled" || die
+		fi
+	else
+		chromium_compile
+	fi
+
+	mv out/Release/chromedriver{.unstripped,} || die
+
+	rm -f out/Release/locales/*.pak.info || die
+
+	# Generate support files (desktop file, manpage, etc.) See: #684550 #706786 #968958
+	${EPYTHON} "${FILESDIR}/generate-support-files.py" \
+		--installdir "/usr/$(get_libdir)/chromium-browser" \
+		--channel "${SLOT}" ||
+			die "Failed to generate support files"
+}
+
+src_test() {
+	# Tests may be flaky with usersandbox, and the test runner executes significantly faster without.
+	# If you seem to be excluding too many tests for a particular milestone: comment them out, reboot, and
+	# run the tests again. If that doesn't help, try FEATURES="-usersandbox" and send it because obviously the
+	# chromium gods are not smiling upon you today. Do some runtime testing, obvs.
+	local skip_tests=(
+		# Wildcard exclusions (if all tests in a test suite are broken)
+		'AlternateTestParams/PartitionAllocDeathTest.RepeatedAllocReturnNullDirect/*'
+		'AlternateTestParams/PartitionAllocDeathTest.RepeatedReallocReturnNullDirect/*'
+		'AlternateTestParams/PartitionAllocTest.*' # 200+ tests, >= 1 crashes entire test runner with usersandbox.
+		'CheckExitCodeAfterSignalHandlerDeathTest.*'
+		'CriticalProcessAndThreadSpotChecks/HangWatcherAnyCriticalThreadTests.*'
+		'LazyThreadPoolTaskRunnerEnvironmentTest.*' # M142
+		'ToolsSanityTest.BadVirtualCall*'
+		# Since 151.0.7922.137
+		'CheckDeathTest.*'
+		'EnumSetDeathTest.*'
+		'OptionalRefDeathTest.*'
+		'RawRefDeathTest.*'
+		'AlternateTestParams/PartitionAllocDeathTest.CheckTriggered*'
+		'CallbackHelpersTest.*'
+		'SafeRefTest.*'
+		'SpanTest.*'
+		'WeakValueTableTest.*'
+		'PlatformSharedMemoryRegionTest.*'
+		'RefCountedOverflowTest.*'
+		'SingleThreadTaskRunnerCurrentDefaultHandleTest.*'
+		'TestFutureDeathTest.*'
+		'WeakPtrDeathTest.*'
+		'SafeRefDeathTest.*'
+		'LinkedListDeathTest.*'
+		'BindDeathTest.*'
+		'ReallocProtectedIteratorDeathTest.*'
+		'PASpanTest.*'
+		'BackupRefPtrTest.*'
+		'All/Base64Test.Overflow*'
+		'ValuesTest.*'
+		'TaskEnvironmentTest.*'
+		'CheckedObserverListTest.*'
+		'MemoryConsumerRegistryTest.*'
+		ProtectedMemoryDeathTest.FailsIfDefinedOutsideOfProtectMemoryRegion
+		StructuredSharedMemoryDeathTest.DuplicateRegion
+		CheckedContiguousIteratorDeathTest.OutOfBounds
+		HeapArrayDeathTest.TakeFirstWithOverSize
+		CallbackDeathTest.RunNullCallbackChecks
+		ObserverListThreadSafeDeathTest.CrossThreadRemovalRestricted
+		SequencedTaskRunnerCurrentDefaultHandleDeathTest.OverrideWithNull
+		TestFutureWithoutTaskEnvironmentDeathTest.WaitShouldDcheckWithoutTaskEnvironment
+		ScopedThreadPriorityDeathTest.NoRealTime
+		ReallocProtectedIteratorDeathTest.StringReallocCrashes
+		BarrierCallbackTest.ErrorToCallCallbackWithZeroCallbacks
+		BarrierClosureTest.ChecksIfCalledForZeroClosures
+		SupportsUserDataTest.ReentrantSetUserDataDuringRemoval
+		TimeBase.AddSubInfinities
+		LibcppHardeningTest.Assertions
+		IDMapTest.RemovedValueHandling
+		MultiMemoryConsumerTest.DuplicateInterventionsCheck
+		PersistentMemoryAllocatorTest.DelayedAllocationTest
+		SequenceCheckerTest.MoveOffSequenceBanned
+		ThreadCheckerTest.MoveOffThreadBanned
+		TokenType.TokenFromNullUnguessableToken
+		ZipTest.CheckForIterationPastTheEnd
+		MemoryConsumerTraitsTest.ActiveConsumerWithPassiveTraitsFails
+		SingleThreadTaskRunnerMainThreadDefaultHandleTest.Basic
+
+		# requires en-us locale
+		SysStrings.SysNativeMBAndWide
+		SysStrings.SysNativeMBToWide
+		SysStrings.SysWideToNativeMB
+		# Specific test cases
+		CancelableEventTest.BothCancelFailureAndSucceedOccurUnderContention
+		FilePathTest.FromUTF8Unsafe_And_AsUTF8Unsafe
+		HistogramTesterTest.PumaTestUniqueSample
+		ImmediateCrashTest.ExpectedOpcodeSequence # M150
+		PathServiceTest.CheckedGetFailure
+		PlatformThreadTest.CanChangeThreadType
+		RawPtrTest.SetLookupUsesGetForComparison # M146 ; also broken for alpine in M144.
+		RustLogIntegrationTest.CheckAllSeverity
+		StackCanary.ChangingStackCanaryCrashesOnReturn
+		StackTraceDeathTest.StackDumpSignalHandlerIsMallocFree
+		TestLauncherTools.TruncateSnippetFocusedMatchesFatalMessagesTest
+		ThreadPoolEnvironmentConfig.CanUseBackgroundPriorityForWorker
+		DriveInfoTest.GetFileDriveInfo
+
+	)
+	local test_filter="-$(IFS=:; printf '%s' "${skip_tests[*]}")"
+	# test-launcher-bot-mode enables parallelism and plain output
+	# Check individual tests with --gtest_filter=<test you want> --single-process-tests
+	./out/Release/base_unittests --test-launcher-bot-mode \
+		--test-launcher-jobs="$(get_makeopts_jobs)" \
+		--gtest_filter="${test_filter}" || die "Tests failed!"
+}
+
+src_install() {
+	local browser_suffix
+	if [[ "${SLOT}" != "stable" ]]; then
+		browser_suffix="-${SLOT}"
+	else
+		browser_suffix=""
+	fi
+	local CHROMIUM_HOME="/usr/$(get_libdir)/chromium-browser${browser_suffix}"
+	exeinto "${CHROMIUM_HOME}"
+	doexe out/Release/chrome
+
+	newexe out/Release/chrome_sandbox chrome-sandbox
+	fperms 4755 "${CHROMIUM_HOME}/chrome-sandbox"
+
+	doexe out/Release/chromedriver
+	doexe out/Release/chrome_crashpad_handler
+
+	ozone_auto_session () {
+		use X && use wayland && ! use headless && echo true || echo false
+	}
+
+	cat <<- EOF > "${D}${CHROMIUM_HOME}/chromium-launcher.sh" || die
+		#!/bin/bash
+		# Wrapper to launch slotted Chromium via the chromium-common launcher script.
+		export CHROME_DESKTOP="chromium-browser${browser_suffix}.desktop"
+		export CHROME_EXEC_NAME="chromium-browser${browser_suffix}"
+		export CHROME_VERSION_EXTRA="${SLOT}"
+		export CHROME_WRAPPER="\$(readlink -f "\$0")"
+		export OZONE_AUTO_SESSION=$(ozone_auto_session)
+
+		exec /usr/libexec/chromium/chromium-launcher.sh "\$@"
+	EOF
+
+	chmod 755 "${D}${CHROMIUM_HOME}/chromium-launcher.sh" || die
+
+	# It is important that we name the target "chromium-browser",
+	# xdg-utils expect it; bug #355517.
+	dosym "${CHROMIUM_HOME}/chromium-launcher.sh" /usr/bin/chromium-browser${browser_suffix}
+	# keep the old symlink around for consistency
+	dosym "${CHROMIUM_HOME}/chromium-launcher.sh" /usr/bin/chromium${browser_suffix}
+
+	dosym "${CHROMIUM_HOME}/chromedriver" /usr/bin/chromedriver${browser_suffix}
+
+	pushd out/Release/locales > /dev/null || die
+	chromium_remove_language_paks
+	popd > /dev/null || die
+
+	insinto "${CHROMIUM_HOME}"
+	doins out/Release/*.bin
+	doins out/Release/*.pak
+
+	if use bindist; then
+		# We built libffmpeg as a component library, but we can't distribute it
+		# with proprietary codec support. Remove it and make a symlink to the requested
+		# system library.
+		rm -f out/Release/libffmpeg.so \
+			|| die "Failed to remove bundled libffmpeg.so (with proprietary codecs)"
+		# symlink the libffmpeg.so from either ffmpeg-chromium or ffmpeg[chromium].
+		einfo "Creating symlink to libffmpeg.so from $(usex ffmpeg-chromium ffmpeg-chromium ffmpeg[chromium])..."
+		dosym ../chromium/libffmpeg.so$(usex ffmpeg-chromium .${PV%%\.*} "") \
+			/usr/$(get_libdir)/chromium-browser/libffmpeg.so
+	fi
+
+	local test_libs=(
+		"libimmediate_crash_test_helper.so"
+		"libmalloc_wrapper.so"
+		"libtest_shared_library.so"
+		"libtest_trace_processor.so"
+	)
+	if use test; then
+		local test_lib
+		for test_lib in "${test_libs[@]}"; do
+			rm -f "out/Release/${test_lib}" || die "Failed to remove ${test_lib}"
+		done
+	fi
+
+	(
+		shopt -s nullglob
+		local files=(out/Release/*.so out/Release/*.so.[0-9])
+		[[ ${#files[@]} -gt 0 ]] && doins "${files[@]}"
+	)
+
+	if ! use system-icu && ! use headless; then
+		doins out/Release/icudtl.dat
+	fi
+
+	doins -r out/Release/locales
+	doins -r out/Release/MEIPreload
+
+	# Install vk_swiftshader_icd.json; bug #827861
+	doins out/Release/vk_swiftshader_icd.json
+
+	if [[ -d out/Release/swiftshader ]]; then
+		insinto "${CHROMIUM_HOME}/swiftshader"
+		doins out/Release/swiftshader/*.so
+	fi
+
+	# Install icons
+	local branding size
+	for size in 16 24 32 48 64 128 256 ; do
+		case ${size} in
+			16|32) branding="chrome/app/theme/default_100_percent/chromium" ;;
+				*) branding="chrome/app/theme/chromium" ;;
+		esac
+		newicon -s ${size} "${branding}/product_logo_${size}.png" \
+			chromium-browser${browser_suffix}.png
+	done
+
+	# Install desktop entry
+	domenu out/Release/chromium-browser${browser_suffix}.desktop
+
+	# Install GNOME default application entry (bug #303100).
+	insinto /usr/share/gnome-control-center/default-apps
+	doins out/Release/chromium-browser${browser_suffix}.xml
+
+	# Install AppStream metadata
+	insinto /usr/share/appdata
+	doins out/Release/chromium-browser${browser_suffix}.appdata.xml
+
+	# Install manpage; bug #684550
+	doman out/Release/chromium-browser${browser_suffix}.1
+	dosym chromium-browser${browser_suffix}.1 /usr/share/man/man1/chromium${browser_suffix}.1
+
+	readme.gentoo_create_doc
+}
+
+pkg_postrm() {
+	xdg_icon_cache_update
+	xdg_desktop_database_update
+}
+
+pkg_postinst() {
+	xdg_icon_cache_update
+	xdg_desktop_database_update
+	readme.gentoo_print_elog
+
+	if use !headless && [[ -z "${REPLACING_VERSIONS}" ]]; then
+		if use vaapi; then
+			elog "Hardware-accelerated video decoding configuration:"
+			elog
+			elog "Chromium supports multiple backends for hardware acceleration. To enable one,"
+			elog "   Add to CHROMIUM_FLAGS in /etc/chromium/default:"
+			elog
+			elog "1. VA-API with OpenGL (recommended for most users):"
+			elog "   --enable-features=AcceleratedVideoDecodeLinuxGL"
+			elog "   VaapiVideoDecoder may need to be added as well, but try without first."
+			elog
+			if use wayland; then
+				elog "2. Enhanced Wayland/EGL performance:"
+				elog "   --enable-features=AcceleratedVideoDecodeLinuxGL,AcceleratedVideoDecodeLinuxZeroCopyGL"
+				elog
+			fi
+			if use X; then
+				elog "$(usex wayland "3" "2"). VA-API with Vulkan:"
+				elog "   --enable-features=VaapiVideoDecoder,VaapiIgnoreDriverChecks,Vulkan,DefaultANGLEVulkan,VulkanFromANGLE"
+				elog
+				if use wayland; then
+					elog "   NOTE: Vulkan acceleration requires X11 and will not work under Wayland sessions."
+					elog "   Use OpenGL-based acceleration instead when running under Wayland."
+					elog
+				fi
+			fi
+			elog "Additional options:"
+			elog "  To enable hardware-accelerated encoding (if supported)"
+			elog "  add 'AcceleratedVideoEncoder' to your feature list"
+			elog "  VaapiIgnoreDriverChecks bypasses driver compatibility checks"
+			elog "  (may be needed for newer/unsupported hardware)"
+			elog
+		else
+			elog "This Chromium build was compiled without VA-API support, which provides"
+			elog "hardware-accelerated video decoding."
+		fi
+		if use screencast; then
+			elog "Screencast is disabled by default at runtime. Either enable it"
+			elog "by navigating to chrome://flags/#enable-webrtc-pipewire-capturer"
+			elog "inside Chromium or add --enable-features=WebRTCPipeWireCapturer"
+			elog "to CHROMIUM_FLAGS in /etc/chromium/default."
+		fi
+		if use gtk4; then
+			elog "Chromium prefers GTK3 over GTK4 at runtime. To override this"
+			elog "behavior you need to pass --gtk-version=4, e.g. by adding it"
+			elog "to CHROMIUM_FLAGS in /etc/chromium/default."
+		fi
+	fi
+
+	if systemd_is_booted && ! [[ -f "/etc/machine-id" ]]; then
+		ewarn "The lack of an '/etc/machine-id' file on this system booted with systemd"
+		ewarn "indicates that the Gentoo handbook was not followed to completion."
+		ewarn ""
+		ewarn "Chromium is known to behave unpredictably with this system configuration;"
+		ewarn "please complete the configuration of this system before logging any bugs."
+	fi
+
+	# Stable slot doesn't change profile directory, and it's vanishingly unlikely that users will downgrade from dev.
+	if [[ -n "${REPLACING_VERSIONS}" ]]; then
+		local replacing_non_slotted=false
+		# there could be more than one PVR
+		for version in ${REPLACING_VERSIONS}; do
+			if ver_test "${version}" -le "145.0.7632.116"; then
+				replacing_non_slotted=true
+				break
+			fi
+		done
+		if ${replacing_non_slotted}; then
+			ewarn "This version of Chromium has replaced a non-slotted ebuild."
+			if [[ ${SLOT} != "stable" ]]; then
+				ewarn "This channel has its own profile directory, so your existing profile will not be used."
+				ewarn "To use your existing profile, either copy or move it to the new location."
+				ewarn "See https://wiki.gentoo.org/wiki/Chromium#Profile_Directories for more information."
+				ewarn ""
+			fi
+			ewarn "Any existing Progressive Web Apps (PWAs) will need to be reinstalled,"
+			ewarn "or have the path in the desktop files updated to point to the new wrapper script."
+		fi
+	fi
+}