# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI="7"

FIREFOX_PATCHSET="firefox-81-patches-01.tar.xz"

LLVM_MAX_SLOT=11

PYTHON_COMPAT=( python3_{6..9} )
PYTHON_REQ_USE="ncurses,sqlite,ssl"

WANT_AUTOCONF="2.1"

VIRTUALX_REQUIRED="pgo"

MOZ_ESR=

# Convert the ebuild version to the upstream mozilla version, used by mozlinguas
MOZ_PV="${PV/_alpha/a}"    # Handle alpha for SRC_URI
MOZ_PV="${MOZ_PV/_beta/b}" # Handle beta for SRC_URI
MOZ_PV="${MOZ_PV%%_rc*}"   # Handle rc for SRC_URI

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

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

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

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

PATCH_URIS=(
	https://dev.gentoo.org/~{axs,polynomial-c,whissi}/mozilla/patchsets/${FIREFOX_PATCHSET}
)

SRC_URI="${MOZ_SRC_BASE_URI}/source/${PN}-${MOZ_PV}.source.tar.xz
	${PATCH_URIS[@]}"

DESCRIPTION="Firefox Web Browser"
HOMEPAGE="https://www.mozilla.com/firefox"

KEYWORDS="~amd64 ~arm64 ~ppc64 ~x86"

SLOT="0/$(ver_cut 1)"
LICENSE="MPL-2.0 GPL-2 LGPL-2.1"
IUSE="clang cpu_flags_arm_neon dbus debug eme-free geckodriver +gmp-autoupdate
	hardened hwaccel jack lto +openh264 pgo pulseaudio screencast selinux
	+system-av1 +system-harfbuzz +system-icu +system-jpeg +system-libevent
	+system-libvpx +system-webp wayland wifi"

REQUIRED_USE="screencast? ( wayland )"

BDEPEND="${PYTHON_DEPS}
	app-arch/unzip
	>=dev-util/cbindgen-0.14.3
	>=net-libs/nodejs-10.19.0
	virtual/pkgconfig
	>=virtual/rust-1.43.0
	|| (
		(
			sys-devel/clang:11
			sys-devel/llvm:11
			clang? (
				=sys-devel/lld-11*
				pgo? ( =sys-libs/compiler-rt-sanitizers-11*[profile] )
			)
		)
		(
			sys-devel/clang:10
			sys-devel/llvm:10
			clang? (
				=sys-devel/lld-10*
				pgo? ( =sys-libs/compiler-rt-sanitizers-10*[profile] )
			)
		)
		(
			sys-devel/clang:9
			sys-devel/llvm:9
			clang? (
				=sys-devel/lld-9*
				pgo? ( =sys-libs/compiler-rt-sanitizers-9*[profile] )
			)
		)
	)
	lto? (
		!clang? ( sys-devel/binutils[gold] )
	)
	amd64? ( >=dev-lang/yasm-1.1 )
	x86? ( >=dev-lang/yasm-1.1 )
	!system-av1? (
		amd64? ( >=dev-lang/nasm-2.13 )
		x86? ( >=dev-lang/nasm-2.13 )
	)"

CDEPEND="
	>=dev-libs/nss-3.56
	>=dev-libs/nspr-4.28
	dev-libs/atk
	dev-libs/expat
	>=x11-libs/cairo-1.10[X]
	>=x11-libs/gtk+-2.18:2
	>=x11-libs/gtk+-3.4.0:3[X]
	x11-libs/gdk-pixbuf
	>=x11-libs/pango-1.22.0
	>=media-libs/libpng-1.6.35:0=[apng]
	>=media-libs/mesa-10.2:*
	media-libs/fontconfig
	>=media-libs/freetype-2.4.10
	kernel_linux? ( !pulseaudio? ( media-libs/alsa-lib ) )
	virtual/freedesktop-icon-theme
	>=x11-libs/pixman-0.19.2
	>=dev-libs/glib-2.26:2
	>=sys-libs/zlib-1.2.3
	>=dev-libs/libffi-3.0.10:=
	media-video/ffmpeg
	x11-libs/libX11
	x11-libs/libXcomposite
	x11-libs/libXdamage
	x11-libs/libXext
	x11-libs/libXfixes
	x11-libs/libXrender
	x11-libs/libXt
	dbus? (
		sys-apps/dbus
		dev-libs/dbus-glib
	)
	screencast? ( media-video/pipewire:0/0.3 )
	system-av1? (
		>=media-libs/dav1d-0.3.0:=
		>=media-libs/libaom-1.0.0:=
	)
	system-harfbuzz? (
		>=media-libs/harfbuzz-2.6.8:0=
		>=media-gfx/graphite2-1.3.13
	)
	system-icu? ( >=dev-libs/icu-67.1:= )
	system-jpeg? ( >=media-libs/libjpeg-turbo-1.2.1 )
	system-libevent? ( >=dev-libs/libevent-2.0:0=[threads] )
	system-libvpx? ( >=media-libs/libvpx-1.8.2:0=[postproc] )
	system-webp? ( >=media-libs/libwebp-1.1.0:0= )
	wifi? (
		kernel_linux? (
			sys-apps/dbus
			dev-libs/dbus-glib
			net-misc/networkmanager
		)
	)
	jack? ( virtual/jack )
	selinux? ( sec-policy/selinux-mozilla )"

RDEPEND="${CDEPEND}
	jack? ( virtual/jack )
	openh264? ( media-libs/openh264:*[plugin] )
	pulseaudio? (
		|| (
			media-sound/pulseaudio
			>=media-sound/apulse-0.1.12-r4
		)
	)
	selinux? ( sec-policy/selinux-mozilla )"

DEPEND="${CDEPEND}
	pulseaudio? (
		|| (
			media-sound/pulseaudio
			>=media-sound/apulse-0.1.12-r4[sdk]
		)
	)
	wayland? ( >=x11-libs/gtk+-3.11:3[wayland] )
	amd64? ( virtual/opengl )
	x86? ( virtual/opengl )"

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

# Allow MOZ_GMP_PLUGIN_LIST to be set in an eclass or
# overridden in the enviromnent (advanced hackers only)
if [[ -z "${MOZ_GMP_PLUGIN_LIST+set}" ]] ; then
	MOZ_GMP_PLUGIN_LIST=( gmp-gmpopenh264 gmp-widevinecdm )
fi

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

	if use clang ; then
		if ! has_version -b "=sys-devel/lld-${LLVM_SLOT}*" ; then
			ewarn "=sys-devel/lld-${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-${LLVM_SLOT}*" ; then
				ewarn "=sys-libs/compiler-rt-sanitizers-${LLVM_SLOT}* is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
				return 1
			fi
		fi
	fi

	einfo "Will use LLVM slot ${LLVM_SLOT}!" >&2
}

MOZ_LANGS=(
	ach af an ar ast az be bg bn br bs ca-valencia ca cak cs cy
	da de dsb el en-CA en-GB en-US eo es-AR es-CL es-ES es-MX et eu
	fa ff fi fr fy-NL ga-IE gd gl gn gu-IN he hi-IN hr hsb hu hy-AM
	ia id is it ja ka kab kk km kn ko lij lt lv mk mr ms my
	nb-NO ne-NP nl nn-NO oc pa-IN pl pt-BR pt-PT rm ro ru
	si sk sl son sq sr sv-SE ta te th tl tr trs uk ur uz vi
	xh 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 -> ${PN}-${MOZ_PV}-${lang}.xpi"
		SRC_URI+=" )"
		IUSE+=" l10n_${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}"
}

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="13G"
		else
			CHECKREQS_DISK_BUILD="5G"
		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="13G"
		else
			CHECKREQS_DISK_BUILD="5G"
		fi

		check-reqs_pkg_setup

		llvm_pkg_setup

		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 ! 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
	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() {
	use pgo && rm -v "${WORKDIR}"/firefox-patches/*-LTO-Only-enable-LTO-*.patch
	eapply "${WORKDIR}/firefox-patches"

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

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

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

	# 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

	# Clearing checksums where we have applied patches
	moz_clear_vendor_checksums target-lexicon-0.9.0

	# 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

	xdg_src_prepare
}

src_configure() {
	local have_switched_compiler=
	if use clang && ! tc-is-clang ; then
		# Force clang
		einfo "Enforcing the use of clang due to USE=clang ..."
		have_switched_compiler=yes
		CC=${CHOST}-clang
		CXX=${CHOST}-clang++
	elif ! use clang && ! tc-is-gcc ; then
		# Force gcc
		have_switched_compiler=yes
		einfo "Enforcing the use of gcc due to USE=-clang ..."
		CC=${CHOST}-gcc
		CXX=${CHOST}-g++
	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
	export HOST_CC="$(tc-getBUILD_CC)"
	export HOST_CXX="$(tc-getBUILD_CXX)"
	tc-export CC CXX LD AR NM OBJDUMP RANLIB PKG_CONFIG

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

	# Initialize MOZCONFIG
	mozconfig_add_options_ac '' --enable-application=browser

	if use lto ; then
		if use clang ; then
			# Upstream only supports lld when using clang
			mozconfig_add_options_ac "forcing ld=lld due to USE=clang and USE=lto" --enable-linker=lld

			mozconfig_add_options_ac '+lto' --enable-lto=cross
		else
			# Linking only works when using ld.gold when LTO is enabled
			mozconfig_add_options_ac "forcing ld=gold due to USE=lto" --enable-linker=gold

			# ThinLTO is currently broken, see bmo#1644409
			mozconfig_add_options_ac '+lto' --enable-lto=full
		fi

		if use pgo ; then
			mozconfig_add_options_ac '+pgo' MOZ_PGO=1
		fi
	else
		# Avoid auto-magic on linker
		if use clang ; then
			# This is upstream's default
			mozconfig_add_options_ac "forcing ld=lld due to USE=clang" --enable-linker=lld
		elif tc-ld-is-gold ; then
			mozconfig_add_options_ac "linker is set to gold" --enable-linker=gold
		else
			mozconfig_add_options_ac "linker is set to bfd" --enable-linker=bfd
		fi
	fi

	# LTO flag was handled via configure
	filter-flags '-flto*'

	mozconfig_use_enable debug
	if use debug ; then
		if is-flag '-g*' ; then
			mozconfig_add_options_ac '+debug' --enable-debug-symbols=$(get-flag '-g*')
		else
			mozconfig_add_options_ac '+debug' --enable-debug-symbols
		fi

		mozconfig_add_options_ac '+debug' --disable-optimize
	else
		if is-flag '-g*' ; then
			mozconfig_add_options_ac '+debug' --enable-debug-symbols=$(get-flag '-g*')
		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*'

	mozconfig_add_options_ac 'Gentoo default' \
		--allow-addon-sideload \
		--disable-cargo-incremental \
		--disable-crashreporter \
		--disable-install-strip \
		--disable-strip \
		--disable-updater \
		--enable-official-branding \
		--enable-release \
		--enable-system-ffi \
		--enable-system-pixman \
		--host="${CBUILD:-${CHOST}}" \
		--libdir="${EPREFIX}/usr/$(get_libdir)" \
		--prefix="${EPREFIX}/usr" \
		--target="${CHOST}" \
		--without-ccache \
		--with-intl-api \
		--with-libclang-path="$(llvm-config --libdir)" \
		--with-system-nspr \
		--with-system-nss \
		--with-system-png \
		--with-system-zlib \
		--with-toolchain-prefix="${CHOST}-" \
		--with-unsigned-addon-scopes=app,system \
		--x-includes="${SYSROOT}${EPREFIX}/usr/include" \
		--x-libraries="${SYSROOT}${EPREFIX}/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 && [[ ${CHOST} != armv*h* ]] ; then
		mozconfig_add_options_ac '' --enable-rust-simd
	fi

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

	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 system-libevent "${SYSROOT}${EPREFIX}/usr"
	mozconfig_use_with system-libvpx
	mozconfig_use_with system-webp

	mozconfig_use_enable dbus

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

	mozconfig_use_enable geckodriver

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

	mozconfig_use_enable jack

	mozconfig_use_enable pulseaudio
	# force the deprecated alsa sound code if pulseaudio is disabled
	if use kernel_linux && ! use pulseaudio ; then
		mozconfig_add_options_ac '-pulseaudio' --enable-alsa
	fi

	mozconfig_use_enable screencast pipewire

	mozconfig_use_enable wifi necko-wifi

	if use wayland ; then
		mozconfig_add_options_ac '+wayland' --enable-default-toolkit=cairo-gtk3-wayland
	else
		mozconfig_add_options_ac '' --enable-default-toolkit=cairo-gtk3
	fi

	# Modifications to better support ARM, bug #553364
	if use cpu_flags_arm_neon ; then
		mozconfig_add_options_ac '+cpu_flags_arm_neon' --with-fpu=neon

		if ! tc-is-clang ; then
			# thumb options aren't supported when using clang, bug 666966
			mozconfig_add_options_ac '+cpu_flags_arm_neon' \
				--with-thumb=yes \
				--with-thumb-interwork=no
		fi
	fi

	if [[ ${CHOST} == armv*h* ]] ; then
		mozconfig_add_options_ac 'CHOST=armv*h*' --with-float-abi=hard

		if ! use system-libvpx ; then
			sed -i \
				-e "s|softfp|hard|" \
				"${S}"/media/libvpx/moz.build \
				|| die
		fi
	fi

	if use clang ; then
		# https://bugzilla.mozilla.org/show_bug.cgi?id=1482204
		# https://bugzilla.mozilla.org/show_bug.cgi?id=1483822
		# toolkit/moz.configure Elfhack section: target.cpu in ('arm', 'x86', 'x86_64')
		local disable_elf_hack=
		if use amd64 ; then
			disable_elf_hack=yes
		elif use x86 ; then
			disable_elf_hack=yes
		elif use arm ; then
			disable_elf_hack=yes
		fi

		if [[ -n ${disable_elf_hack} ]] ; then
			mozconfig_add_options_ac 'elf-hack is broken when using Clang' --disable-elf-hack
		fi
	fi

	# Additional ARCH support
	case "${ARCH}" in
		arm | ppc64)
			# Reduce the memory requirements for linking
			if use clang ; then
				# Nothing to do
				:;
			elif tc-ld-is-gold ; then
				append-ldflags -Wl,--no-keep-memory
			else
				append-ldflags -Wl,--no-keep-memory -Wl,--reduce-memory-overheads
			fi
			;;
	esac

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

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

	# Use system's Python environment
	export MACH_USE_SYSTEM_PYTHON=1

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

	# Build system requires xargs but is unable to find it
	mozconfig_add_options_mk 'Gentoo default' "XARGS=${EPREFIX}/usr/bin/xargs"

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

	# 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 use pgo ; then
		virtx_cmd=virtx

		# Reset and cleanup environment variables used by GNOME/XDG
		gnome2_environment_reset

		addpredict /root
	fi

	local -x GDK_BACKEND=x11

	${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/firefox \
		"${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}"/disable-auto-update.policy.json policies.json

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

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

	# 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 hwaccel prefs if USE=hwaccel is enabled
	if use hwaccel ; then
		cat "${FILESDIR}"/gentoo-hwaccel-prefs.js-1 \
		>>"${GENTOO_PREFS}" \
		|| die "failed to add prefs to force hardware-accelerated rendering to all-gentoo.js"
	fi

	if ! use gmp-autoupdate ; then
		local plugin
		for plugin in "${MOZ_GMP_PLUGIN_LIST[@]}" ; do
			einfo "Disabling auto-update for ${plugin} plugin ..."
			cat >>"${GENTOO_PREFS}" <<-EOF || die "failed to disable autoupdate for ${plugin} media plugin"
			pref("media.${plugin}.autoupdate",   false);
			EOF
		done
	fi

	# 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 geckodriver
	if use geckodriver ; then
		einfo "Installing geckodriver into ${ED}${MOZILLA_FIVE_HOME} ..."
		pax-mark m "${BUILD_DIR}"/dist/bin/geckodriver
		exeinto "${MOZILLA_FIVE_HOME}"
		doexe "${BUILD_DIR}"/dist/bin/geckodriver

		dosym ${MOZILLA_FIVE_HOME}/geckodriver /usr/bin/geckodriver
	fi

	# Install icons
	local icon_srcdir="${S}/browser/branding/official"
	local icon_symbolic_file="${FILESDIR}/icon/firefox-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 menus
	local wrapper_wayland="${PN}-wayland.sh"
	local wrapper_x11="${PN}-x11.sh"
	local desktop_file="${FILESDIR}/icon/${PN}-r2.desktop"
	local display_protocols="auto X11"
	local icon="${PN}"
	local name="Mozilla ${PN^}"
	local use_wayland="false"

	if use wayland ; then
		display_protocols+=" Wayland"
		use_wayland="true"
	fi

	local app_name desktop_filename display_protocol exec_command
	for display_protocol in ${display_protocols} ; do
		app_name="${name} on ${display_protocol}"
		desktop_filename="${PN}-${display_protocol,,}.desktop"

		case ${display_protocol} in
			Wayland)
				exec_command="${PN}-wayland --name ${PN}-wayland"
				newbin "${FILESDIR}/${wrapper_wayland}" ${PN}-wayland
				;;
			X11)
				if ! use wayland ; then
					# Exit loop here because there's no choice so
					# we don't need wrapper/.desktop file for X11.
					continue
				fi

				exec_command="${PN}-x11 --name ${PN}-x11"
				newbin "${FILESDIR}/${wrapper_x11}" ${PN}-x11
				;;
			*)
				app_name="${name}"
				desktop_filename="${PN}.desktop"
				exec_command="${PN}"
				;;
		esac

		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
	done

	# Install generic wrapper script
	rm "${ED}/usr/bin/${PN}" || die
	newbin "${FILESDIR}/${PN}.sh" ${PN}

	# Update wrapper
	local wrapper
	for wrapper in \
		"${ED}/usr/bin/${PN}" \
		"${ED}/usr/bin/${PN}-x11" \
		"${ED}/usr/bin/${PN}-wayland" \
	; do
		[[ ! -f "${wrapper}" ]] && continue

		sed -i \
			-e "s:@PREFIX@:${EPREFIX}/usr:" \
			-e "s:@DEFAULT_WAYLAND@:${use_wayland}:" \
			"${wrapper}" \
			|| die
	done
}

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 gmp-autoupdate ; then
		elog "USE='-gmp-autoupdate' has disabled the following plugins from updating or"
		elog "installing into new profiles:"
		local plugin
		for plugin in "${MOZ_GMP_PLUGIN_LIST[@]}" ; do
			elog "\t ${plugin}"
		done
		elog
	fi

	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

	local show_doh_information show_normandy_information

	if [[ -z "${REPLACING_VERSIONS}" ]] ; then
		# New install; Tell user that DoH is disabled by default
		show_doh_information=yes
		show_normandy_information=yes
	else
		local replacing_version
		for replacing_version in ${REPLACING_VERSIONS} ; do
			if ver_test "${replacing_version}" -lt 70 ; then
				# Tell user only once about our DoH default
				show_doh_information=yes
			fi

			if ver_test "${replacing_version}" -lt 74.0-r2 ; then
				# Tell user only once about our Normandy default
				show_normandy_information=yes
			fi
		done
	fi

	if [[ -n "${show_doh_information}" ]] ; then
		elog
		elog "Note regarding Trusted Recursive Resolver aka DNS-over-HTTPS (DoH):"
		elog "Due to privacy concerns (encrypting DNS might be a good thing, sending all"
		elog "DNS traffic to Cloudflare by default is not a good idea and applications"
		elog "should respect OS configured settings), \"network.trr.mode\" was set to 5"
		elog "(\"Off by choice\") by default."
		elog "You can enable DNS-over-HTTPS in ${PN^}'s preferences."
	fi

	# bug 713782
	if [[ -n "${show_normandy_information}" ]] ; then
		elog
		elog "Upstream operates a service named Normandy which allows Mozilla to"
		elog "push changes for default settings or even install new add-ons remotely."
		elog "While this can be useful to address problems like 'Armagadd-on 2.0' or"
		elog "revert previous decisions to disable TLS 1.0/1.1, privacy and security"
		elog "concerns prevail, which is why we have switched off the use of this"
		elog "service by default."
		elog
		elog "To re-enable this service set"
		elog
		elog "    app.normandy.enabled=true"
		elog
		elog "in about:config."
	fi
}