# Copyright 1999-2024 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

FIREFOX_PATCHSET="firefox-128esr-patches-03.tar.xz"

LLVM_COMPAT=( 17 18 )

PYTHON_COMPAT=( python3_{10..12} )
PYTHON_REQ_USE="ncurses,sqlite,ssl"

RUST_MIN_VER="1.77.1"
RUST_NEEDS_LLVM=1

WANT_AUTOCONF="2.1"

VIRTUALX_REQUIRED="manual"

# Thunderbird will have separate release and esr channels, matching Firefox's rapid and esr.
MOZ_ESR=yes

MOZ_PV=${PV}
MOZ_PV_SUFFIX=
if [[ ${PV} =~ (_(alpha|beta|rc).*)$ ]] ; then
	MOZ_PV_SUFFIX=${BASH_REMATCH[1]}

	# Convert the ebuild version to the upstream Mozilla version
	MOZ_PV="${MOZ_PV/_alpha/a}" # Handle alpha for SRC_URI
	MOZ_PV="${MOZ_PV/_beta/b}"  # Handle beta for SRC_URI
	MOZ_PV="${MOZ_PV%%_rc*}"    # Handle rc for SRC_URI
fi

if [[ -n ${MOZ_ESR} ]] ; then
	# ESR releases have slightly different version numbers
	MOZ_PV="${MOZ_PV}esr"
fi

MOZ_PN="${PN%-bin}"
MOZ_P="${MOZ_PN}-${MOZ_PV}"
MOZ_PV_DISTFILES="${MOZ_PV}${MOZ_PV_SUFFIX}"
MOZ_P_DISTFILES="${MOZ_PN}-${MOZ_PV_DISTFILES}"

inherit autotools check-reqs desktop flag-o-matic gnome2-utils linux-info llvm-r1 multiprocessing \
	optfeature pax-utils python-any-r1 rust toolchain-funcs virtualx xdg

DESCRIPTION="Thunderbird Mail Client"
HOMEPAGE="https://www.thunderbird.net/"

MOZ_SRC_BASE_URI="https://archive.mozilla.org/pub/${MOZ_PN}/releases/${MOZ_PV}"

if [[ ${PV} == *_rc* ]] ; then
	MOZ_SRC_BASE_URI="https://archive.mozilla.org/pub/${MOZ_PN}/candidates/${MOZ_PV}-candidates/build${PV##*_rc}"
fi

PATCH_URIS=(
	https://dev.gentoo.org/~juippis/mozilla/patchsets/${FIREFOX_PATCHSET}
)

SRC_URI="${MOZ_SRC_BASE_URI}/source/${MOZ_P}.source.tar.xz -> ${MOZ_P_DISTFILES}.source.tar.xz
	${PATCH_URIS[@]}"
S="${WORKDIR}/${PN}-${PV%_*}"

LICENSE="MPL-2.0 GPL-2 LGPL-2.1"
SLOT="0"
KEYWORDS="amd64 ~arm64 ~ppc64 ~x86"

IUSE="+clang +dbus debug eme-free hardened hwaccel jack libproxy lto pgo pulseaudio sndio selinux"
IUSE+=" +system-av1 +system-harfbuzz +system-icu +system-jpeg +system-libevent +system-libvpx"
IUSE+=" system-png +system-webp wayland wifi +X"

# Thunderbird-only USE flags.
IUSE+=" +rust-extensions +system-librnp"

REQUIRED_USE="|| ( X wayland )
	debug? ( !system-av1 )
	pgo? ( lto )
	rust-extensions? ( dbus )
	wayland? ( dbus )
	wifi? ( dbus )"

TB_ONLY_DEPEND="selinux? ( sec-policy/selinux-thunderbird )
	!system-librnp? ( dev-libs/jsoncpp )
	system-librnp? ( >=dev-util/librnp-0.17.1 )"
BDEPEND="${PYTHON_DEPS}
	$(llvm_gen_dep '
		sys-devel/clang:${LLVM_SLOT}
		sys-devel/llvm:${LLVM_SLOT}
		clang? (
			sys-devel/lld:${LLVM_SLOT}
			pgo? ( sys-libs/compiler-rt-sanitizers:${LLVM_SLOT}[profile] )
		)
	')
	app-alternatives/awk
	app-arch/unzip
	app-arch/zip
	>=dev-util/cbindgen-0.26.0
	net-libs/nodejs
	virtual/pkgconfig
	!elibc_glibc? ( dev-lang/rust )
	amd64? ( >=dev-lang/nasm-2.14 )
	x86? ( >=dev-lang/nasm-2.14 )
	pgo? (
		X? (
			sys-devel/gettext
			x11-base/xorg-server[xvfb]
			x11-apps/xhost
		)
		!X? (
			|| (
				gui-wm/tinywl
				<gui-libs/wlroots-0.17.3[tinywl(-)]
			)
			x11-misc/xkeyboard-config
		)
	)"
COMMON_DEPEND="${TB_ONLY_DEPEND}
	>=app-accessibility/at-spi2-core-2.46.0:2
	dev-libs/expat
	dev-libs/glib:2
	dev-libs/libffi:=
	>=dev-libs/nss-3.101
	>=dev-libs/nspr-4.35
	media-libs/alsa-lib
	media-libs/fontconfig
	media-libs/freetype
	media-libs/mesa
	media-video/ffmpeg
	sys-libs/zlib
	virtual/freedesktop-icon-theme
	x11-libs/cairo
	x11-libs/gdk-pixbuf:2
	x11-libs/pango
	x11-libs/pixman
	dbus? ( sys-apps/dbus )
	jack? ( virtual/jack )
	pulseaudio? (
		|| (
			media-libs/libpulse
			>=media-sound/apulse-0.1.12-r4[sdk]
		)
	)
	libproxy? ( net-libs/libproxy )
	selinux? ( sec-policy/selinux-mozilla )
	sndio? ( >=media-sound/sndio-1.8.0-r1 )
	system-av1? (
		>=media-libs/dav1d-1.0.0:=
		>=media-libs/libaom-1.0.0:=
	)
	system-harfbuzz? (
		>=media-gfx/graphite2-1.3.13
		>=media-libs/harfbuzz-2.8.1:0=
	)
	system-icu? ( >=dev-libs/icu-74.1:= )
	system-jpeg? ( >=media-libs/libjpeg-turbo-1.2.1:= )
	system-libevent? ( >=dev-libs/libevent-2.1.12:0=[threads(+)] )
	system-libvpx? ( >=media-libs/libvpx-1.8.2:0=[postproc] )
	system-png? ( >=media-libs/libpng-1.6.35:0=[apng] )
	system-webp? ( >=media-libs/libwebp-1.1.0:0= )
	wayland? (
		>=media-libs/libepoxy-1.5.10-r1
		x11-libs/gtk+:3[wayland]
	)
	wifi? (
		kernel_linux? (
			|| (
				net-misc/networkmanager
				net-misc/connman[networkmanager]
			)
			sys-apps/dbus
		)
	)
	X? (
		virtual/opengl
		x11-libs/cairo[X]
		x11-libs/gtk+:3[X]
		x11-libs/libX11
		x11-libs/libXcomposite
		x11-libs/libXdamage
		x11-libs/libXext
		x11-libs/libXfixes
		x11-libs/libXrandr
		x11-libs/libxcb:=
	)"
RDEPEND="${COMMON_DEPEND}
	jack? ( virtual/jack )"
DEPEND="${COMMON_DEPEND}
	X? (
		x11-base/xorg-proto
		x11-libs/libICE
		x11-libs/libSM
	)"

llvm_check_deps() {
	if ! has_version -b "sys-devel/clang:${LLVM_SLOT}" ; then
		einfo "sys-devel/clang:${LLVM_SLOT} is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
		return 1
	fi

	if use clang && ! tc-ld-is-mold ; then
		if ! has_version -b "sys-devel/lld:${LLVM_SLOT}" ; then
			einfo "sys-devel/lld:${LLVM_SLOT} is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
			return 1
		fi

		if use pgo ; then
			if ! has_version -b "=sys-libs/compiler-rt-sanitizers-${LLVM_SLOT}*[profile]" ; then
				einfo "=sys-libs/compiler-rt-sanitizers-${LLVM_SLOT}*[profile] is missing!" >&2
				einfo "Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
				return 1
			fi
		fi
	fi

	einfo "Using LLVM slot ${LLVM_SLOT} to build" >&2
}

MOZ_LANGS=(
	af ar ast be bg br ca cak cs cy da de dsb
	el en-CA en-GB en-US es-AR es-ES es-MX et eu
	fi fr fy-NL ga-IE gd gl he hr hsb hu
	id is it ja ka kab kk ko lt lv ms nb-NO nl nn-NO
	pa-IN pl pt-BR pt-PT rm ro ru
	sk sl sq sr sv-SE th tr uk uz vi zh-CN zh-TW
)

mozilla_set_globals() {
	# https://bugs.gentoo.org/587334
	local MOZ_TOO_REGIONALIZED_FOR_L10N=(
		fy-NL ga-IE gu-IN hi-IN hy-AM nb-NO ne-NP nn-NO pa-IN sv-SE
	)

	local lang xflag
	for lang in "${MOZ_LANGS[@]}" ; do
		# en and en_US are handled internally
		if [[ ${lang} == en ]] || [[ ${lang} == en-US ]] ; then
			continue
		fi

		# strip region subtag if $lang is in the list
		if has ${lang} "${MOZ_TOO_REGIONALIZED_FOR_L10N[@]}" ; then
			xflag=${lang%%-*}
		else
			xflag=${lang}
		fi

		SRC_URI+=" l10n_${xflag/[_@]/-}? ("
		SRC_URI+=" ${MOZ_SRC_BASE_URI}/linux-x86_64/xpi/${lang}.xpi -> ${MOZ_P_DISTFILES}-${lang}.xpi"
		SRC_URI+=" )"
		IUSE+=" l10n_${xflag/[_@]/-}"
	done
}
mozilla_set_globals

moz_clear_vendor_checksums() {
	debug-print-function ${FUNCNAME} "$@"

	if [[ ${#} -ne 1 ]] ; then
		die "${FUNCNAME} requires exact one argument"
	fi

	einfo "Clearing cargo checksums for ${1} ..."

	sed -i \
		-e 's/\("files":{\)[^}]*/\1/' \
		"${S}"/third_party/rust/${1}/.cargo-checksum.json || die
}

moz_install_xpi() {
	debug-print-function ${FUNCNAME} "$@"

	if [[ ${#} -lt 2 ]] ; then
		die "${FUNCNAME} requires at least two arguments"
	fi

	local DESTDIR=${1}
	shift

	insinto "${DESTDIR}"

	local emid xpi_file xpi_tmp_dir
	for xpi_file in "${@}" ; do
		emid=
		xpi_tmp_dir=$(mktemp -d --tmpdir="${T}")

		# Unpack XPI
		unzip -qq "${xpi_file}" -d "${xpi_tmp_dir}" || die

		# Determine extension ID
		if [[ -f "${xpi_tmp_dir}/install.rdf" ]] ; then
			emid=$(sed -n -e '/install-manifest/,$ { /em:id/!d; s/.*[\">]\([^\"<>]*\)[\"<].*/\1/; p; q }' "${xpi_tmp_dir}/install.rdf")
			[[ -z "${emid}" ]] && die "failed to determine extension id from install.rdf"
		elif [[ -f "${xpi_tmp_dir}/manifest.json" ]] ; then
			emid=$(sed -n -e 's/.*"id": "\([^"]*\)".*/\1/p' "${xpi_tmp_dir}/manifest.json")
			[[ -z "${emid}" ]] && die "failed to determine extension id from manifest.json"
		else
			die "failed to determine extension id"
		fi

		einfo "Installing ${emid}.xpi into ${ED}${DESTDIR} ..."
		newins "${xpi_file}" "${emid}.xpi"
	done
}

mozconfig_add_options_ac() {
	debug-print-function ${FUNCNAME} "$@"

	if [[ ${#} -lt 2 ]] ; then
		die "${FUNCNAME} requires at least two arguments"
	fi

	local reason=${1}
	shift

	local option
	for option in ${@} ; do
		echo "ac_add_options ${option} # ${reason}" >>${MOZCONFIG}
	done
}

mozconfig_add_options_mk() {
	debug-print-function ${FUNCNAME} "$@"

	if [[ ${#} -lt 2 ]] ; then
		die "${FUNCNAME} requires at least two arguments"
	fi

	local reason=${1}
	shift

	local option
	for option in ${@} ; do
		echo "mk_add_options ${option} # ${reason}" >>${MOZCONFIG}
	done
}

mozconfig_use_enable() {
	debug-print-function ${FUNCNAME} "$@"

	if [[ ${#} -lt 1 ]] ; then
		die "${FUNCNAME} requires at least one arguments"
	fi

	local flag=$(use_enable "${@}")
	mozconfig_add_options_ac "$(use ${1} && echo +${1} || echo -${1})" "${flag}"
}

mozconfig_use_with() {
	debug-print-function ${FUNCNAME} "$@"

	if [[ ${#} -lt 1 ]] ; then
		die "${FUNCNAME} requires at least one arguments"
	fi

	local flag=$(use_with "${@}")
	mozconfig_add_options_ac "$(use ${1} && echo +${1} || echo -${1})" "${flag}"
}

virtwl() {
	debug-print-function ${FUNCNAME} "$@"

	[[ $# -lt 1 ]] && die "${FUNCNAME} needs at least one argument"
	[[ -n $XDG_RUNTIME_DIR ]] || die "${FUNCNAME} needs XDG_RUNTIME_DIR to be set; try xdg_environment_reset"
	tinywl -h >/dev/null || die 'tinywl -h failed'

	local VIRTWL VIRTWL_PID
	coproc VIRTWL { WLR_BACKENDS=headless exec tinywl -s 'echo $WAYLAND_DISPLAY; read _; kill $PPID'; }
	local -x WAYLAND_DISPLAY
	read WAYLAND_DISPLAY <&${VIRTWL[0]}

	debug-print "${FUNCNAME}: $@"
	"$@"
	local r=$?

	[[ -n $VIRTWL_PID ]] || die "tinywl exited unexpectedly"
	exec {VIRTWL[0]}<&- {VIRTWL[1]}>&-
	return $r
}

pkg_pretend() {
	if [[ ${MERGE_TYPE} != binary ]] ; then
		if use pgo ; then
			if ! has usersandbox $FEATURES ; then
				die "You must enable usersandbox as X server can not run as root!"
			fi
		fi

		# Ensure we have enough disk space to compile
		if use pgo || use lto || use debug ; then
			CHECKREQS_DISK_BUILD="13500M"
		else
			CHECKREQS_DISK_BUILD="6600M"
		fi

		check-reqs_pkg_pretend
	fi
}

pkg_setup() {
	if [[ ${MERGE_TYPE} != binary ]] ; then
		if use pgo ; then
			if ! has userpriv ${FEATURES} ; then
				eerror "Building ${PN} with USE=pgo and FEATURES=-userpriv is not supported!"
			fi
		fi

		# Ensure we have enough disk space to compile
		if use pgo || use lto || use debug ; then
			CHECKREQS_DISK_BUILD="13500M"
		else
			CHECKREQS_DISK_BUILD="6400M"
		fi

		check-reqs_pkg_setup

		llvm-r1_pkg_setup
		rust_pkg_setup

		if use clang && use lto && tc-ld-is-lld ; then
			local version_lld=$(ld.lld --version 2>/dev/null | awk '{ print $2 }')
			[[ -n ${version_lld} ]] && version_lld=$(ver_cut 1 "${version_lld}")
			[[ -z ${version_lld} ]] && die "Failed to read ld.lld version!"

			local version_llvm_rust=$(rustc -Vv 2>/dev/null | grep -F -- 'LLVM version:' | awk '{ print $3 }')
			[[ -n ${version_llvm_rust} ]] && version_llvm_rust=$(ver_cut 1 "${version_llvm_rust}")
			[[ -z ${version_llvm_rust} ]] && die "Failed to read used LLVM version from rustc!"

			if ver_test "${version_lld}" -ne "${version_llvm_rust}" ; then
				eerror "Rust is using LLVM version ${version_llvm_rust} but ld.lld version belongs to LLVM version ${version_lld}."
				eerror "You will be unable to link ${CATEGORY}/${PN}. To proceed you have the following options:"
				eerror "  - Manually switch rust version using 'eselect rust' to match used LLVM version"
				eerror "  - Switch to dev-lang/rust[system-llvm] which will guarantee matching version"
				eerror "  - Build ${CATEGORY}/${PN} without USE=lto"
				eerror "  - Rebuild lld with llvm that was used to build rust (may need to rebuild the whole "
				eerror "    llvm/clang/lld/rust chain depending on your @world updates)"
				die "LLVM version used by Rust (${version_llvm_rust}) does not match with ld.lld version (${version_lld})!"
			fi
		fi

		python-any-r1_pkg_setup

		# Avoid PGO profiling problems due to enviroment leakage
		# These should *always* be cleaned up anyway
		unset \
			DBUS_SESSION_BUS_ADDRESS \
			DISPLAY \
			ORBIT_SOCKETDIR \
			SESSION_MANAGER \
			XAUTHORITY \
			XDG_CACHE_HOME \
			XDG_SESSION_COOKIE

		# Build system is using /proc/self/oom_score_adj, bug #604394
		addpredict /proc/self/oom_score_adj

		if use pgo ; then
			# Update 105.0: "/proc/self/oom_score_adj" isn't enough anymore with pgo, but not sure
			# whether that's due to better OOM handling by Firefox (bmo#1771712), or portage
			# (PORTAGE_SCHEDULING_POLICY) update...
			addpredict /proc

			# Clear tons of conditions, since PGO is hardware-dependant.
			addpredict /dev
		fi

		if ! mountpoint -q /dev/shm ; then
			# If /dev/shm is not available, configure is known to fail with
			# a traceback report referencing /usr/lib/pythonN.N/multiprocessing/synchronize.py
			ewarn "/dev/shm is not mounted -- expect build failures!"
		fi

		# Google API keys (see http://www.chromium.org/developers/how-tos/api-keys)
		# Note: These are for Gentoo Linux use ONLY. For your own distribution, please
		# get your own set of keys.
		if [[ -z "${MOZ_API_KEY_GOOGLE+set}" ]] ; then
			MOZ_API_KEY_GOOGLE="AIzaSyDEAOvatFogGaPi0eTgsV_ZlEzx0ObmepsMzfAc"
		fi

		if [[ -z "${MOZ_API_KEY_LOCATION+set}" ]] ; then
			MOZ_API_KEY_LOCATION="AIzaSyB2h2OuRgGaPicUgy5N-5hsZqiPW6sH3n_rptiQ"
		fi

		# Mozilla API keys (see https://location.services.mozilla.com/api)
		# Note: These are for Gentoo Linux use ONLY. For your own distribution, please
		# get your own set of keys.
		if [[ -z "${MOZ_API_KEY_MOZILLA+set}" ]] ; then
			MOZ_API_KEY_MOZILLA="edb3d487-3a84-46m0ap1e3-9dfd-92b5efaaa005"
		fi

		# Ensure we use C locale when building, bug #746215
		export LC_ALL=C
	fi
}

src_unpack() {
	local _lp_dir="${WORKDIR}/language_packs"
	local _src_file

	if [[ ! -d "${_lp_dir}" ]] ; then
		mkdir "${_lp_dir}" || die
	fi

	for _src_file in ${A} ; do
		if [[ ${_src_file} == *.xpi ]]; then
			cp "${DISTDIR}/${_src_file}" "${_lp_dir}" || die "Failed to copy '${_src_file}' to '${_lp_dir}'!"
		else
			unpack ${_src_file}
		fi
	done
}

src_prepare() {
	if use lto; then
		rm -v "${WORKDIR}"/firefox-patches/*-LTO-Only-enable-LTO-*.patch || die
	fi

	# Workaround for bgo#917599
	if has_version ">=dev-libs/icu-74.1" && use system-icu ; then
		eapply "${WORKDIR}"/firefox-patches/*-bmo-1862601-system-icu-74.patch
	fi
	rm -v "${WORKDIR}"/firefox-patches/*-bmo-1862601-system-icu-74.patch || die

	# Workaround for bgo#915651 on musl
	if use elibc_glibc ; then
		rm -v "${WORKDIR}"/firefox-patches/*bgo-748849-RUST_TARGET_override.patch || die
	fi

	eapply "${WORKDIR}/firefox-patches"

	# Allow user to apply any additional patches without modifing ebuild
	eapply_user

	# Make cargo respect MAKEOPTS
	export CARGO_BUILD_JOBS="$(makeopts_jobs)"

	# Workaround for bgo#915651
	if ! use elibc_glibc ; then
		if use amd64 ; then
			export RUST_TARGET="x86_64-unknown-linux-musl"
		elif use x86 ; then
			export RUST_TARGET="i686-unknown-linux-musl"
		else
			die "Unknown musl chost, please post your rustc -vV along with emerge --info on Gentoo's bug #915651"
		fi
	fi

	# Make LTO respect MAKEOPTS
	sed -i -e "s/multiprocessing.cpu_count()/$(makeopts_jobs)/" \
		"${S}"/build/moz.configure/lto-pgo.configure || die "Failed sedding multiprocessing.cpu_count"

	# Make ICU respect MAKEOPTS
	sed -i -e "s/multiprocessing.cpu_count()/$(makeopts_jobs)/" \
		"${S}"/intl/icu_sources_data.py || die "Failed sedding multiprocessing.cpu_count"

	# Respect MAKEOPTS all around (maybe some find+sed is better)
	sed -i -e "s/multiprocessing.cpu_count()/$(makeopts_jobs)/" \
		"${S}"/python/mozbuild/mozbuild/base.py || die "Failed sedding multiprocessing.cpu_count"

	sed -i -e "s/multiprocessing.cpu_count()/$(makeopts_jobs)/" \
		"${S}"/third_party/libwebrtc/build/toolchain/get_cpu_count.py || die "Failed sedding multiprocessing.cpu_count"

	sed -i -e "s/multiprocessing.cpu_count()/$(makeopts_jobs)/" \
		"${S}"/third_party/libwebrtc/build/toolchain/get_concurrent_links.py ||
			die "Failed sedding multiprocessing.cpu_count"

	sed -i -e "s/multiprocessing.cpu_count()/$(makeopts_jobs)/" \
		"${S}"/third_party/python/gyp/pylib/gyp/input.py || die "Failed sedding multiprocessing.cpu_count"

	sed -i -e "s/multiprocessing.cpu_count()/$(makeopts_jobs)/" \
		"${S}"/python/mozbuild/mozbuild/code_analysis/mach_commands.py || die "Failed sedding multiprocessing.cpu_count"

	# sed-in toolchain prefix
	sed -i \
		-e "s/objdump/${CHOST}-objdump/" \
		"${S}"/python/mozbuild/mozbuild/configure/check_debug_ranges.py || die "sed failed to set toolchain prefix"

	sed -i \
		-e 's/ccache_stats = None/return None/' \
		"${S}"/python/mozbuild/mozbuild/controller/building.py || die "sed failed to disable ccache stats call"

	einfo "Removing pre-built binaries ..."

	find "${S}"/third_party -type f \( -name '*.so' -o -name '*.o' \) -print -delete || die

	# Clear checksums from cargo crates we've manually patched.
	# moz_clear_vendor_checksums xyz

	# Create build dir
	BUILD_DIR="${WORKDIR}/${PN}_build"
	mkdir -p "${BUILD_DIR}" || die

	# Write API keys to disk
	echo -n "${MOZ_API_KEY_GOOGLE//gGaPi/}" > "${S}"/api-google.key || die
	echo -n "${MOZ_API_KEY_LOCATION//gGaPi/}" > "${S}"/api-location.key || die
	echo -n "${MOZ_API_KEY_MOZILLA//m0ap1/}" > "${S}"/api-mozilla.key || die

	xdg_environment_reset
}

src_configure() {
	# Show flags set at the beginning
	einfo "Current BINDGEN_CFLAGS:\t${BINDGEN_CFLAGS:-no value set}"
	einfo "Current CFLAGS:\t\t${CFLAGS:-no value set}"
	einfo "Current CXXFLAGS:\t\t${CXXFLAGS:-no value set}"
	einfo "Current LDFLAGS:\t\t${LDFLAGS:-no value set}"
	einfo "Current RUSTFLAGS:\t\t${RUSTFLAGS:-no value set}"

	local have_switched_compiler=
	if use clang; then
		# Force clang
		einfo "Enforcing the use of clang due to USE=clang ..."

		local version_clang=$(clang --version 2>/dev/null | grep -F -- 'clang version' | awk '{ print $3 }')
		[[ -n ${version_clang} ]] && version_clang=$(ver_cut 1 "${version_clang}")
		[[ -z ${version_clang} ]] && die "Failed to read clang version!"

		if tc-is-gcc; then
			have_switched_compiler=yes
		fi
		AR=llvm-ar
		CC=${CHOST}-clang-${version_clang}
		CXX=${CHOST}-clang++-${version_clang}
		NM=llvm-nm
		RANLIB=llvm-ranlib
	elif ! use clang && ! tc-is-gcc ; then
		# Force gcc
		have_switched_compiler=yes
		einfo "Enforcing the use of gcc due to USE=-clang ..."
		AR=gcc-ar
		CC=${CHOST}-gcc
		CXX=${CHOST}-g++
		NM=gcc-nm
		RANLIB=gcc-ranlib
	fi

	if [[ -n "${have_switched_compiler}" ]] ; then
		# Because we switched active compiler we have to ensure
		# that no unsupported flags are set
		strip-unsupported-flags
	fi

	# Ensure we use correct toolchain,
	# AS is used in a non-standard way by upstream, #bmo1654031
	export HOST_CC="$(tc-getBUILD_CC)"
	export HOST_CXX="$(tc-getBUILD_CXX)"
	export AS="$(tc-getCC) -c"

	# Configuration tests expect llvm-readelf output, bug 913130
	READELF="llvm-readelf"

	tc-export CC CXX LD AR AS NM OBJDUMP RANLIB READELF PKG_CONFIG

	# Pass the correct toolchain paths through cbindgen
	if tc-is-cross-compiler ; then
		export BINDGEN_CFLAGS="${SYSROOT:+--sysroot=${ESYSROOT}} --target=${CHOST} ${BINDGEN_CFLAGS-}"
	fi

	# Set MOZILLA_FIVE_HOME
	export MOZILLA_FIVE_HOME="/usr/$(get_libdir)/${PN}"

	# python/mach/mach/mixin/process.py fails to detect SHELL
	export SHELL="${EPREFIX}/bin/bash"

	# Set state path
	export MOZBUILD_STATE_PATH="${BUILD_DIR}"

	# Set MOZCONFIG
	export MOZCONFIG="${S}/.mozconfig"

	# Initialize MOZCONFIG
	mozconfig_add_options_ac '' --enable-application=comm/mail
	mozconfig_add_options_ac '' --enable-project=comm/mail

	# Set Gentoo defaults
	mozconfig_add_options_ac 'Gentoo default' \
		--allow-addon-sideload \
		--disable-cargo-incremental \
		--disable-crashreporter \
		--disable-disk-remnant-avoidance \
		--disable-geckodriver \
		--disable-gpsd \
		--disable-install-strip \
		--disable-legacy-profile-creation \
		--disable-parental-controls \
		--disable-strip \
		--disable-tests \
		--disable-updater \
		--disable-valgrind \
		--disable-wmf \
		--enable-js-shell \
		--enable-negotiateauth \
		--enable-new-pass-manager \
		--enable-official-branding \
		--enable-release \
		--enable-system-ffi \
		--enable-system-pixman \
		--enable-system-policies \
		--host="${CBUILD:-${CHOST}}" \
		--libdir="${EPREFIX}/usr/$(get_libdir)" \
		--prefix="${EPREFIX}/usr" \
		--target="${CHOST}" \
		--without-ccache \
		--without-wasm-sandboxed-libraries \
		--with-intl-api \
		--with-libclang-path="$(llvm-config --libdir)" \
		--with-system-nspr \
		--with-system-nss \
		--with-system-zlib \
		--with-toolchain-prefix="${CHOST}-" \
		--with-unsigned-addon-scopes=app,system \
		--x-includes="${ESYSROOT}/usr/include" \
		--x-libraries="${ESYSROOT}/usr/$(get_libdir)"

	# Set update channel
	local update_channel=release
	[[ -n ${MOZ_ESR} ]] && update_channel=esr
	mozconfig_add_options_ac '' --update-channel=${update_channel}

	if ! use x86 ; then
		mozconfig_add_options_ac '' --enable-rust-simd
	fi

	# For future keywording: This is currently (97.0) only supported on:
	# amd64, arm, arm64 & x86.
	# Might want to flip the logic around if Firefox is to support more arches.
	# bug 833001, bug 903411#c8
	if use ppc64 || use riscv; then
		mozconfig_add_options_ac '' --disable-sandbox
	else
		mozconfig_add_options_ac '' --enable-sandbox
	fi

	# Enable JIT on riscv64 explicitly
	# Can be removed once upstream enable it by default in the future.
	use riscv && mozconfig_add_options_ac 'Enable JIT for RISC-V 64' --enable-jit

	if [[ -s "${S}/api-google.key" ]] ; then
		local key_origin="Gentoo default"
		if [[ $(cat "${S}/api-google.key" | md5sum | awk '{ print $1 }') != 709560c02f94b41f9ad2c49207be6c54 ]] ; then
			key_origin="User value"
		fi

		mozconfig_add_options_ac "${key_origin}" \
			--with-google-safebrowsing-api-keyfile="${S}/api-google.key"
	else
		einfo "Building without Google API key ..."
	fi

	if [[ -s "${S}/api-location.key" ]] ; then
		local key_origin="Gentoo default"
		if [[ $(cat "${S}/api-location.key" | md5sum | awk '{ print $1 }') != ffb7895e35dedf832eb1c5d420ac7420 ]] ; then
			key_origin="User value"
		fi

		mozconfig_add_options_ac "${key_origin}" \
			--with-google-location-service-api-keyfile="${S}/api-location.key"
	else
		einfo "Building without Location API key ..."
	fi

	if [[ -s "${S}/api-mozilla.key" ]] ; then
		local key_origin="Gentoo default"
		if [[ $(cat "${S}/api-mozilla.key" | md5sum | awk '{ print $1 }') != 3927726e9442a8e8fa0e46ccc39caa27 ]] ; then
			key_origin="User value"
		fi

		mozconfig_add_options_ac "${key_origin}" \
			--with-mozilla-api-keyfile="${S}/api-mozilla.key"
	else
		einfo "Building without Mozilla API key ..."
	fi

	mozconfig_use_enable rust-extensions thunderbird-rust

	mozconfig_use_with system-av1
	mozconfig_use_with system-harfbuzz
	mozconfig_use_with system-harfbuzz system-graphite2
	mozconfig_use_with system-icu
	mozconfig_use_with system-jpeg
	mozconfig_use_with system-libevent
	mozconfig_use_with system-libvpx
	mozconfig_use_with system-png
	mozconfig_use_with system-webp

	if use system-librnp; then
		mozconfig_add_options_ac "+system-librnp" --enable-compile-environment
		mozconfig_use_with system-librnp
	else
		# This controls the backend of the bundled librnp. Choices are "botan" and "openssl".
		# RNP Upstream recommends to use botan. In Gentoo it's preferred to use system-librnp.
		mozconfig_add_options_ac "+bundled librnp backend = botan" --with-librnp-backend="botan"
	fi

	mozconfig_use_enable dbus
	mozconfig_use_enable libproxy

	use eme-free && mozconfig_add_options_ac '+eme-free' --disable-eme

	if use hardened ; then
		mozconfig_add_options_ac "+hardened" --enable-hardening
		append-ldflags "-Wl,-z,relro -Wl,-z,now"

		# Increase the FORTIFY_SOURCE value, #910071.
		sed -i -e '/-D_FORTIFY_SOURCE=/s:2:3:' "${S}"/build/moz.configure/toolchain.configure || die
	fi

	local myaudiobackends=""
	use jack && myaudiobackends+="jack,"
	use sndio && myaudiobackends+="sndio,"
	use pulseaudio && myaudiobackends+="pulseaudio,"
	! use pulseaudio && myaudiobackends+="alsa,"

	mozconfig_add_options_ac '--enable-audio-backends' --enable-audio-backends="${myaudiobackends::-1}"

	mozconfig_use_enable wifi necko-wifi

	if use X && use wayland ; then
		mozconfig_add_options_ac '+x11+wayland' --enable-default-toolkit=cairo-gtk3-x11-wayland
	elif ! use X && use wayland ; then
		mozconfig_add_options_ac '+wayland' --enable-default-toolkit=cairo-gtk3-wayland-only
	else
		mozconfig_add_options_ac '+x11' --enable-default-toolkit=cairo-gtk3-x11-only
	fi

	# LTO is handled via configure
	filter-lto

	if use lto ; then
		if use clang ; then
			# Upstream only supports lld or mold when using clang.
			if tc-ld-is-mold ; then
				# mold expects the -flto line from *FLAGS configuration, bgo#923119
				append-ldflags "-flto=thin"
				mozconfig_add_options_ac "using ld=mold due to system selection" --enable-linker=mold
			else
				mozconfig_add_options_ac "forcing ld=lld due to USE=clang and USE=lto" --enable-linker=lld
			fi

			mozconfig_add_options_ac '+lto' --enable-lto=cross

		else
			# ThinLTO is currently broken, see bmo#1644409.
			# mold does not support gcc+lto combination.
			mozconfig_add_options_ac '+lto' --enable-lto=full
			mozconfig_add_options_ac "linker is set to bfd" --enable-linker=bfd
		fi

		if use pgo ; then
			mozconfig_add_options_ac '+pgo' MOZ_PGO=1

			if use clang ; then
				# Used in build/pgo/profileserver.py
				export LLVM_PROFDATA="llvm-profdata"
			fi
		fi
	else
		# Avoid auto-magic on linker
		if use clang ; then
			# lld is upstream's default
			if tc-ld-is-mold ; then
				mozconfig_add_options_ac "using ld=mold due to system selection" --enable-linker=mold
			else
				mozconfig_add_options_ac "forcing ld=lld due to USE=clang" --enable-linker=lld
			fi

		else
			if tc-ld-is-mold ; then
				mozconfig_add_options_ac "using ld=mold due to system selection" --enable-linker=mold
			else
				mozconfig_add_options_ac "linker is set to bfd due to USE=-clang" --enable-linker=bfd
			fi
		fi
	fi

	mozconfig_use_enable debug
	if use debug ; then
		mozconfig_add_options_ac '+debug' --disable-optimize
		mozconfig_add_options_ac '+debug' --enable-jemalloc
		mozconfig_add_options_ac '+debug' --enable-real-time-tracing
	else
		mozconfig_add_options_ac 'Gentoo defaults' --disable-real-time-tracing

		if is-flag '-g*' ; then
			if use clang ; then
				mozconfig_add_options_ac 'from CFLAGS' --enable-debug-symbols=$(get-flag '-g*')
			else
				mozconfig_add_options_ac 'from CFLAGS' --enable-debug-symbols
			fi
		else
			mozconfig_add_options_ac 'Gentoo default' --disable-debug-symbols
		fi

		if is-flag '-O0' ; then
			mozconfig_add_options_ac "from CFLAGS" --enable-optimize=-O0
		elif is-flag '-O4' ; then
			mozconfig_add_options_ac "from CFLAGS" --enable-optimize=-O4
		elif is-flag '-O3' ; then
			mozconfig_add_options_ac "from CFLAGS" --enable-optimize=-O3
		elif is-flag '-O1' ; then
			mozconfig_add_options_ac "from CFLAGS" --enable-optimize=-O1
		elif is-flag '-Os' ; then
			mozconfig_add_options_ac "from CFLAGS" --enable-optimize=-Os
		else
			mozconfig_add_options_ac "Gentoo default" --enable-optimize=-O2
		fi
	fi

	# Debug flag was handled via configure
	filter-flags '-g*'

	# Optimization flag was handled via configure
	filter-flags '-O*'

	# elf-hack
	# Filter "-z,pack-relative-relocs" and let the build system handle it instead.
	if use amd64 || use x86 ; then
		filter-flags "-z,pack-relative-relocs"

		if tc-ld-is-mold ; then
			# relr-elf-hack is currently broken with mold, bgo#916259
			mozconfig_add_options_ac 'disable elf-hack with mold linker' --disable-elf-hack
		else
			mozconfig_add_options_ac 'relr elf-hack' --enable-elf-hack=relr
		fi
	elif use ppc64 || use riscv ; then
		# '--disable-elf-hack' is not recognized on ppc64/riscv,
		# see bgo #917049, #930046
		:;
	else
		mozconfig_add_options_ac 'disable elf-hack on non-supported arches' --disable-elf-hack
	fi

	if ! use elibc_glibc; then
		mozconfig_add_options_ac '!elibc_glibc' --disable-jemalloc
	fi

	# System-av1 fix
	use system-av1 && append-ldflags "-Wl,--undefined-version"

	# Allow elfhack to work in combination with unstripped binaries
	# when they would normally be larger than 2GiB.
	append-ldflags "-Wl,--compress-debug-sections=zlib"

	# Make revdep-rebuild.sh happy; Also required for musl
	append-ldflags -Wl,-rpath="${MOZILLA_FIVE_HOME}",--enable-new-dtags

	# Pass $MAKEOPTS to build system
	export MOZ_MAKE_FLAGS="${MAKEOPTS}"

	# Use system's Python environment
	export PIP_NETWORK_INSTALL_RESTRICTED_VIRTUALENVS=mach

	export MACH_BUILD_PYTHON_NATIVE_PACKAGE_SOURCE="none"

	# Disable notification when build system has finished
	export MOZ_NOSPAM=1

	# Portage sets XARGS environment variable to "xargs -r" by default which
	# breaks build system's check_prog() function which doesn't support arguments
	mozconfig_add_options_ac 'Gentoo default' "XARGS=${EPREFIX}/usr/bin/xargs"

	# Set build dir
	mozconfig_add_options_mk 'Gentoo default' "MOZ_OBJDIR=${BUILD_DIR}"

	# Show flags we will use
	einfo "Build BINDGEN_CFLAGS:\t${BINDGEN_CFLAGS:-no value set}"
	einfo "Build CFLAGS:\t\t${CFLAGS:-no value set}"
	einfo "Build CXXFLAGS:\t\t${CXXFLAGS:-no value set}"
	einfo "Build LDFLAGS:\t\t${LDFLAGS:-no value set}"
	einfo "Build RUSTFLAGS:\t\t${RUSTFLAGS:-no value set}"

	# Handle EXTRA_CONF and show summary
	local ac opt hash reason

	# Apply EXTRA_ECONF entries to $MOZCONFIG
	if [[ -n ${EXTRA_ECONF} ]] ; then
		IFS=\! read -a ac <<<${EXTRA_ECONF// --/\!}
		for opt in "${ac[@]}"; do
			mozconfig_add_options_ac "EXTRA_ECONF" --${opt#--}
		done
	fi

	echo
	echo "=========================================================="
	echo "Building ${PF} with the following configuration"
	grep ^ac_add_options "${MOZCONFIG}" | while read ac opt hash reason; do
		[[ -z ${hash} || ${hash} == \# ]] \
			|| die "error reading mozconfig: ${ac} ${opt} ${hash} ${reason}"
		printf "    %-30s  %s\n" "${opt}" "${reason:-mozilla.org default}"
	done
	echo "=========================================================="
	echo

	./mach configure || die
}

src_compile() {
	local virtx_cmd=

	if tc-ld-is-mold && use lto; then
		# increase ulimit with mold+lto, bugs #892641, #907485
		if ! ulimit -n 16384 1>/dev/null 2>&1 ; then
			ewarn "Unable to modify ulimits - building with mold+lto might fail due to low ulimit -n resources."
			ewarn "Please see bugs #892641 & #907485."
		else
			ulimit -n 16384
		fi
	fi

	if use pgo; then
		# Reset and cleanup environment variables used by GNOME/XDG
		gnome2_environment_reset

		addpredict /root

		if ! use X; then
			virtx_cmd=virtwl
		else
			virtx_cmd=virtx
		fi
	fi

	if ! use X; then
		local -x GDK_BACKEND=wayland
	else
		local -x GDK_BACKEND=x11
	fi

	${virtx_cmd} ./mach build --verbose || die
}

src_install() {
	# xpcshell is getting called during install
	pax-mark m \
		"${BUILD_DIR}"/dist/bin/xpcshell \
		"${BUILD_DIR}"/dist/bin/${PN} \
		"${BUILD_DIR}"/dist/bin/plugin-container

	DESTDIR="${D}" ./mach install || die

	# Upstream cannot ship symlink but we can (bmo#658850)
	rm "${ED}${MOZILLA_FIVE_HOME}/${PN}-bin" || die
	dosym ${PN} ${MOZILLA_FIVE_HOME}/${PN}-bin

	# Don't install llvm-symbolizer from sys-devel/llvm package
	if [[ -f "${ED}${MOZILLA_FIVE_HOME}/llvm-symbolizer" ]] ; then
		rm -v "${ED}${MOZILLA_FIVE_HOME}/llvm-symbolizer" || die
	fi

	# Install policy (currently only used to disable application updates)
	insinto "${MOZILLA_FIVE_HOME}/distribution"
	newins "${FILESDIR}"/distribution.ini distribution.ini
	newins "${FILESDIR}"/disable-auto-update.policy.json policies.json

	# Install system-wide preferences
	local PREFS_DIR="${MOZILLA_FIVE_HOME}/defaults/pref"
	insinto "${PREFS_DIR}"
	newins "${FILESDIR}"/gentoo-default-prefs-r1.js gentoo-prefs.js

	local GENTOO_PREFS="${ED}${PREFS_DIR}/gentoo-prefs.js"

	# Force hwaccel prefs if USE=hwaccel is enabled
	if use hwaccel ; then
		cat "${FILESDIR}"/gentoo-hwaccel-prefs.js \
		>>"${GENTOO_PREFS}" \
		|| die "failed to add prefs to force hardware-accelerated rendering to all-gentoo.js"

		if use wayland; then
			cat >>"${GENTOO_PREFS}" <<-EOF || die "failed to set hwaccel wayland prefs"
			pref("gfx.x11-egl.force-enabled",          false);
			EOF
		else
			cat >>"${GENTOO_PREFS}" <<-EOF || die "failed to set hwaccel x11 prefs"
			pref("gfx.x11-egl.force-enabled",          true);
			EOF
		fi
	fi

	# Set dictionary path to use system hunspell
	cat >>"${GENTOO_PREFS}" <<-EOF || die "failed to set spellchecker.dictionary_path pref"
	pref("spellchecker.dictionary_path",       "${EPREFIX}/usr/share/myspell");
	EOF

	# Force the graphite pref if USE=system-harfbuzz is enabled, since the pref cannot disable it
	if use system-harfbuzz ; then
		cat >>"${GENTOO_PREFS}" <<-EOF || die "failed to set gfx.font_rendering.graphite.enabled pref"
		sticky_pref("gfx.font_rendering.graphite.enabled", true);
		EOF
	fi

	# Install language packs
	local langpacks=( $(find "${WORKDIR}/language_packs" -type f -name '*.xpi') )
	if [[ -n "${langpacks}" ]] ; then
		moz_install_xpi "${MOZILLA_FIVE_HOME}/distribution/extensions" "${langpacks[@]}"
	fi

	# Install icons
	local icon_srcdir="${S}/comm/mail/branding/thunderbird"
	local icon_symbolic_file="${icon_srcdir}/TB-symbolic.svg"

	insinto /usr/share/icons/hicolor/symbolic/apps
	newins "${icon_symbolic_file}" ${PN}-symbolic.svg

	local icon size
	for icon in "${icon_srcdir}"/default*.png ; do
		size=${icon%.png}
		size=${size##*/default}

		if [[ ${size} -eq 48 ]] ; then
			newicon "${icon}" ${PN}.png
		fi

		newicon -s ${size} "${icon}" ${PN}.png
	done

	# Install menu
	local app_name="Mozilla ${MOZ_PN^}"
	local desktop_file="${FILESDIR}/icon/${PN}-r2.desktop"
	local desktop_filename="${PN}.desktop"
	local exec_command="${PN}"
	local icon="${PN}"
	local use_wayland="false"

	if use wayland ; then
		use_wayland="true"
	fi

	cp "${desktop_file}" "${WORKDIR}/${PN}.desktop-template" || die

	sed -i \
		-e "s:@NAME@:${app_name}:" \
		-e "s:@EXEC@:${exec_command}:" \
		-e "s:@ICON@:${icon}:" \
		"${WORKDIR}/${PN}.desktop-template" || die

	newmenu "${WORKDIR}/${PN}.desktop-template" "${desktop_filename}"

	rm "${WORKDIR}/${PN}.desktop-template" || die

	# Install wrapper script
	[[ -f "${ED}/usr/bin/${PN}" ]] && rm "${ED}/usr/bin/${PN}"
	newbin "${FILESDIR}/${PN}-r1.sh" ${PN}

	# Update wrapper
	sed -i \
		-e "s:@PREFIX@:${EPREFIX}/usr:" \
		-e "s:@MOZ_FIVE_HOME@:${MOZILLA_FIVE_HOME}:" \
		-e "s:@APULSELIB_DIR@:${apulselib}:" \
		-e "s:@DEFAULT_WAYLAND@:${use_wayland}:" \
		"${ED}/usr/bin/${PN}" || die
}

pkg_preinst() {
	xdg_pkg_preinst

	# If the apulse libs are available in MOZILLA_FIVE_HOME then apulse
	# does not need to be forced into the LD_LIBRARY_PATH
	if use pulseaudio && has_version ">=media-sound/apulse-0.1.12-r4" ; then
		einfo "APULSE found; Generating library symlinks for sound support ..."
		local lib
		pushd "${ED}${MOZILLA_FIVE_HOME}" &>/dev/null || die
		for lib in ../apulse/libpulse{.so{,.0},-simple.so{,.0}} ; do
			# A quickpkg rolled by hand will grab symlinks as part of the package,
			# so we need to avoid creating them if they already exist.
			if [[ ! -L ${lib##*/} ]] ; then
				ln -s "${lib}" ${lib##*/} || die
			fi
		done
		popd &>/dev/null || die
	fi
}

pkg_postinst() {
	xdg_pkg_postinst

	if use pulseaudio && has_version ">=media-sound/apulse-0.1.12-r4" ; then
		elog "Apulse was detected at merge time on this system and so it will always be"
		elog "used for sound.  If you wish to use pulseaudio instead please unmerge"
		elog "media-sound/apulse."
		elog
	fi

	optfeature_header "Optional programs for extra features:"
	optfeature "desktop notifications" x11-libs/libnotify
	optfeature "encrypted chat support" net-libs/libotr
	optfeature "fallback mouse cursor theme e.g. on WMs" gnome-base/gsettings-desktop-schemas
}