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diff --git a/eclass/mozcoreconf-v5.eclass b/eclass/mozcoreconf-v5.eclass
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+# Copyright 1999-2017 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+#
+# @ECLASS: mozcoreconf-v5.eclass
+# @MAINTAINER:
+# Mozilla team <mozilla@gentoo.org>
+# @BLURB: core options and configuration functions for mozilla
+# @DESCRIPTION:
+#
+# inherit mozconfig-v6.* or above for mozilla configuration support
+
+# @ECLASS-VARIABLE: MOZILLA_FIVE_HOME
+# @DESCRIPTION:
+# This is an eclass-generated variable that defines the rpath that the mozilla
+# product will be installed in.  Read-only
+
+if [[ ! ${_MOZCORECONF} ]]; then
+
+PYTHON_COMPAT=( python2_7 )
+PYTHON_REQ_USE='ncurses,sqlite,ssl,threads'
+
+inherit multilib toolchain-funcs flag-o-matic python-any-r1 versionator
+
+IUSE="${IUSE} custom-cflags custom-optimization"
+
+DEPEND="virtual/pkgconfig
+	${PYTHON_DEPS}"
+
+# @FUNCTION: mozconfig_annotate
+# @DESCRIPTION:
+# add an annotated line to .mozconfig
+#
+# Example:
+# mozconfig_annotate "building on ultrasparc" --enable-js-ultrasparc
+# => ac_add_options --enable-js-ultrasparc # building on ultrasparc
+mozconfig_annotate() {
+	declare reason=$1 x ; shift
+	[[ $# -gt 0 ]] || die "mozconfig_annotate missing flags for ${reason}\!"
+	for x in ${*}; do
+		echo "ac_add_options ${x} # ${reason}" >>.mozconfig
+	done
+}
+
+# @FUNCTION: mozconfig_use_enable
+# @DESCRIPTION:
+# add a line to .mozconfig based on a USE-flag
+#
+# Example:
+# mozconfig_use_enable truetype freetype2
+# => ac_add_options --enable-freetype2 # +truetype
+mozconfig_use_enable() {
+	declare flag=$(use_enable "$@")
+	mozconfig_annotate "$(use $1 && echo +$1 || echo -$1)" "${flag}"
+}
+
+# @FUNCTION mozconfig_use_with
+# @DESCRIPTION
+# add a line to .mozconfig based on a USE-flag
+#
+# Example:
+# mozconfig_use_with kerberos gss-api /usr/$(get_libdir)
+# => ac_add_options --with-gss-api=/usr/lib # +kerberos
+mozconfig_use_with() {
+	declare flag=$(use_with "$@")
+	mozconfig_annotate "$(use $1 && echo +$1 || echo -$1)" "${flag}"
+}
+
+# @FUNCTION mozconfig_use_extension
+# @DESCRIPTION
+# enable or disable an extension based on a USE-flag
+#
+# Example:
+# mozconfig_use_extension gnome gnomevfs
+# => ac_add_options --enable-extensions=gnomevfs
+mozconfig_use_extension() {
+	declare minus=$(use $1 || echo -)
+	mozconfig_annotate "${minus:-+}$1" --enable-extensions=${minus}${2}
+}
+
+moz_pkgsetup() {
+	# Ensure we use C locale when building
+	export LANG="C"
+	export LC_ALL="C"
+	export LC_MESSAGES="C"
+	export LC_CTYPE="C"
+
+	# Ensure we use correct toolchain
+	export HOST_CC="$(tc-getBUILD_CC)"
+	export HOST_CXX="$(tc-getBUILD_CXX)"
+	tc-export CC CXX LD PKG_CONFIG
+
+	# Ensure that we have a sane build enviroment
+	export MOZILLA_CLIENT=1
+	export BUILD_OPT=1
+	export NO_STATIC_LIB=1
+	export USE_PTHREADS=1
+	export ALDFLAGS=${LDFLAGS}
+	# ensure MOZCONFIG is not defined
+	eval unset MOZCONFIG
+
+	# set MOZILLA_FIVE_HOME
+	export MOZILLA_FIVE_HOME="/usr/$(get_libdir)/${PN}"
+
+	# nested configure scripts in mozilla products generate unrecognized options
+	# false positives when toplevel configure passes downwards.
+	export QA_CONFIGURE_OPTIONS=".*"
+
+	if [[ $(gcc-major-version) -eq 3 ]]; then
+		ewarn "Unsupported compiler detected, DO NOT file bugs for"
+		ewarn "outdated compilers. Bugs opened with gcc-3 will be closed"
+		ewarn "invalid."
+	fi
+
+	python-any-r1_pkg_setup
+}
+
+# @FUNCTION: mozconfig_init
+# @DESCRIPTION:
+# Initialize mozilla configuration and populate with core settings.
+# This should be called in src_configure before any other mozconfig_* functions.
+mozconfig_init() {
+	declare enable_optimize pango_version myext x
+	declare XUL=$([[ ${PN} == xulrunner ]] && echo true || echo false)
+	declare FF=$([[ ${PN} == firefox ]] && echo true || echo false)
+	declare SM=$([[ ${PN} == seamonkey ]] && echo true || echo false)
+	declare TB=$([[ ${PN} == thunderbird ]] && echo true || echo false)
+
+	####################################
+	#
+	# Setup the initial .mozconfig
+	# See http://www.mozilla.org/build/configure-build.html
+	#
+	####################################
+
+	case ${PN} in
+		*xulrunner)
+			cp xulrunner/config/mozconfig .mozconfig \
+				|| die "cp xulrunner/config/mozconfig failed" ;;
+		*firefox)
+			cp browser/config/mozconfig .mozconfig \
+				|| die "cp browser/config/mozconfig failed" ;;
+		seamonkey)
+			# Must create the initial mozconfig to enable application
+			: >.mozconfig || die "initial mozconfig creation failed"
+			mozconfig_annotate "" --enable-application=suite ;;
+		*thunderbird)
+			# Must create the initial mozconfig to enable application
+			: >.mozconfig || die "initial mozconfig creation failed"
+			mozconfig_annotate "" --enable-application=mail ;;
+	esac
+
+	####################################
+	#
+	# CFLAGS setup and ARCH support
+	#
+	####################################
+
+	# Set optimization level
+	if [[ $(gcc-major-version) -ge 7 ]]; then
+		mozconfig_annotate "Workaround known breakage" --enable-optimize=-O2
+	elif [[ ${ARCH} == hppa ]]; then
+		mozconfig_annotate "more than -O0 causes a segfault on hppa" --enable-optimize=-O0
+	elif [[ ${ARCH} == x86 ]]; then
+		mozconfig_annotate "less then -O2 causes a segfault on x86" --enable-optimize=-O2
+	elif use custom-optimization || [[ ${ARCH} =~ (alpha|ia64) ]]; then
+		# Set optimization level based on CFLAGS
+		if is-flag -O0; then
+			mozconfig_annotate "from CFLAGS" --enable-optimize=-O0
+		elif [[ ${ARCH} == ppc ]] && has_version '>=sys-libs/glibc-2.8'; then
+			mozconfig_annotate "more than -O1 segfaults on ppc with glibc-2.8" --enable-optimize=-O1
+		elif is-flag -O4; then
+			mozconfig_annotate "from CFLAGS" --enable-optimize=-O4
+		elif is-flag -O3; then
+			mozconfig_annotate "from CFLAGS" --enable-optimize=-O3
+		elif is-flag -O1; then
+			mozconfig_annotate "from CFLAGS" --enable-optimize=-O1
+		elif is-flag -Os; then
+			mozconfig_annotate "from CFLAGS" --enable-optimize=-Os
+		else
+			mozconfig_annotate "Gentoo's default optimization" --enable-optimize=-O2
+		fi
+	else
+		# Enable Mozilla's default
+		mozconfig_annotate "mozilla default" --enable-optimize
+	fi
+
+	# Strip optimization so it does not end up in compile string
+	filter-flags '-O*'
+
+	# Strip over-aggressive CFLAGS
+	use custom-cflags || strip-flags
+
+	# Additional ARCH support
+	case "${ARCH}" in
+	arm)
+		# Reduce the memory requirements for linking
+		append-ldflags -Wl,--no-keep-memory -Wl,--reduce-memory-overheads
+		;;
+	alpha)
+		# Historically we have needed to add -fPIC manually for 64-bit.
+		# Additionally, alpha should *always* build with -mieee for correct math
+		# operation
+		append-flags -fPIC -mieee
+		;;
+	ia64)
+		# Historically we have needed to add this manually for 64-bit
+		append-flags -fPIC
+		;;
+	ppc64)
+		append-flags -fPIC -mminimal-toc
+		# Reduce the memory requirements for linking
+		append-ldflags -Wl,--no-keep-memory -Wl,--reduce-memory-overheads
+		;;
+	esac
+
+	# We need to append flags for gcc-6 support
+	if [[ $(gcc-major-version) -ge 6 ]]; then
+		append-cxxflags -fno-delete-null-pointer-checks -fno-lifetime-dse -fno-schedule-insns2
+	fi
+
+	# Go a little faster; use less RAM
+	append-flags "$MAKEEDIT_FLAGS"
+
+	# Use the MOZILLA_FIVE_HOME for the rpath
+	append-ldflags -Wl,-rpath="${MOZILLA_FIVE_HOME}",--enable-new-dtags
+	# Set MOZILLA_FIVE_HOME in mozconfig
+	mozconfig_annotate '' --with-default-mozilla-five-home=${MOZILLA_FIVE_HOME}
+
+	####################################
+	#
+	# mozconfig setup
+	#
+	####################################
+
+	mozconfig_annotate disable_update_strip \
+		--disable-updater \
+		--disable-strip \
+		--disable-install-strip
+
+	# jemalloc won't build with older glibc
+	! has_version ">=sys-libs/glibc-2.4" && mozconfig_annotate "we have old glibc" --disable-jemalloc
+}
+
+# @FUNCTION: mozconfig_final
+# @DESCRIPTION:
+# Apply EXTRA_ECONF values to .mozconfig
+# Display a table describing all configuration options paired
+# with reasons, then clean up extensions list.
+# This should be called in src_configure at the end of all other mozconfig_* functions.
+mozconfig_final() {
+	declare ac opt hash reason
+
+	# Apply EXTRA_ECONF entries to .mozconfig
+	if [[ -n ${EXTRA_ECONF} ]]; then
+		IFS=\! read -a ac <<<${EXTRA_ECONF// --/\!}
+		for opt in "${ac[@]}"; do
+			mozconfig_annotate "EXTRA_ECONF" --${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}" "${reason:-mozilla.org default}"
+	done
+	echo "=========================================================="
+	echo
+
+	# Resolve multiple --enable-extensions down to one
+	declare exts=$(sed -n 's/^ac_add_options --enable-extensions=\([^ ]*\).*/\1/p' \
+		.mozconfig | xargs)
+	sed -i '/^ac_add_options --enable-extensions/d' .mozconfig
+	echo "ac_add_options --enable-extensions=${exts// /,}" >> .mozconfig
+}
+
+_MOZCORECONF=1
+fi