--- /dev/null
+From 7e2d98df390787797fa494b26c72896f16f6e2a6 Mon Sep 17 00:00:00 2001
+From: Georgy Yakovlev <gyakovlev@gentoo.org>
+Date: Sat, 30 Jun 2018 00:21:53 -0700
+Subject: [PATCH] Makefile: fix host ar handling
+
+Cherry picked lines from
+https://github.com/grpc/grpc/pull/11476
+---
+ Makefile | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/Makefile b/Makefile
+index 8333858588..b5a44b7096 100644
+--- a/Makefile
++++ b/Makefile
+@@ -328,6 +328,7 @@ HOST_CC ?= $(CC)
+ HOST_CXX ?= $(CXX)
+ HOST_LD ?= $(LD)
+ HOST_LDXX ?= $(LDXX)
++HOST_AR ?= $(AR)
+
+ CFLAGS += -std=c99 -Wsign-conversion -Wconversion $(W_SHADOW) $(W_EXTRA_SEMI)
+ CXXFLAGS += -std=c++11
+@@ -444,6 +445,7 @@ HOST_CFLAGS = $(CFLAGS)
+ HOST_CXXFLAGS = $(CXXFLAGS)
+ HOST_LDFLAGS = $(LDFLAGS)
+ HOST_LDLIBS = $(LDLIBS)
++HOST_AROPTS = $(AROPTS)
+
+ # These are automatically computed variables.
+ # There shouldn't be any need to change anything from now on.
+@@ -6886,10 +6888,10 @@ $(LIBDIR)/$(CONFIG)/libgrpc_plugin_support.a: protobuf_dep_error
+ else
+
+ $(LIBDIR)/$(CONFIG)/libgrpc_plugin_support.a: $(ZLIB_DEP) $(CARES_DEP) $(ADDRESS_SORTING_DEP) $(PROTOBUF_DEP) $(LIBGRPC_PLUGIN_SUPPORT_OBJS)
+- $(E) "[AR] Creating $@"
++ $(E) "[HOSTAR] Creating $@"
+ $(Q) mkdir -p `dirname $@`
+ $(Q) rm -f $(LIBDIR)/$(CONFIG)/libgrpc_plugin_support.a
+- $(Q) $(AR) $(AROPTS) $(LIBDIR)/$(CONFIG)/libgrpc_plugin_support.a $(LIBGRPC_PLUGIN_SUPPORT_OBJS)
++ $(Q) $(HOST_AR) $(HOST_AROPTS) $(LIBDIR)/$(CONFIG)/libgrpc_plugin_support.a $(LIBGRPC_PLUGIN_SUPPORT_OBJS)
+ ifeq ($(SYSTEM),Darwin)
+ $(Q) ranlib -no_warning_for_no_symbols $(LIBDIR)/$(CONFIG)/libgrpc_plugin_support.a
+ endif
+--
+2.18.0
+
--- /dev/null
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+PYTHON_COMPAT=( python2_7 python3_{4,5,6} )
+DISTUTILS_OPTIONAL=1
+
+inherit distutils-r1 flag-o-matic toolchain-funcs
+
+# should match pinned git submodule version of third_party/protobuf
+# look it up here https://github.com/grpc/grpc/tree/v"${PV}"/third_party
+# also should ~depend on same version of dev-libs/protobuf below
+PROTOBUF_VERSION="3.5.2"
+
+DESCRIPTION="Modern open source high performance RPC framework"
+HOMEPAGE="http://www.grpc.io"
+SRC_URI="
+ https://github.com/${PN}/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz
+ tools? ( https://github.com/google/protobuf/archive/v${PROTOBUF_VERSION}.tar.gz -> protobuf-${PROTOBUF_VERSION}.tar.gz )
+"
+
+LICENSE="Apache-2.0"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE="examples doc python systemtap static-libs tools"
+
+REQUIRED_USE="
+ python? ( ${PYTHON_REQUIRED_USE} )
+ tools? ( python )
+"
+
+RDEPEND="
+ >=dev-libs/openssl-1.0.2:0=[-bindist]
+ ~dev-libs/protobuf-${PROTOBUF_VERSION}:=
+ dev-util/google-perftools
+ net-dns/c-ares:=
+ sys-libs/zlib:=
+ python? ( ${PYTHON_DEPS}
+ dev-python/coverage[${PYTHON_USEDEP}]
+ dev-python/cython[${PYTHON_USEDEP}]
+ >=dev-python/protobuf-python-3.5.1:=[${PYTHON_USEDEP}]
+ dev-python/six[${PYTHON_USEDEP}]
+ dev-python/wheel[${PYTHON_USEDEP}]
+ virtual/python-enum34[${PYTHON_USEDEP}]
+ virtual/python-futures[${PYTHON_USEDEP}]
+ )
+ systemtap? ( dev-util/systemtap )
+"
+
+DEPEND="${RDEPEND}
+ virtual/pkgconfig
+ doc? (
+ python? (
+ dev-python/sphinx[${PYTHON_USEDEP}]
+ dev-python/sphinx_rtd_theme[${PYTHON_USEDEP}]
+ )
+ )
+"
+
+PATCHES=(
+ "${FILESDIR}/0001-grpc-1.13.0-fix-host-ar-handling.patch"
+ "${FILESDIR}/0002-grpc-1.3.0-Fix-unsecure-.pc-files.patch"
+ "${FILESDIR}/0003-grpc-1.3.0-Don-t-run-ldconfig.patch"
+ "${FILESDIR}/0004-grpc-1.11.0-fix-cpp-so-version.patch"
+ "${FILESDIR}/0005-grpc-1.11.0-pkgconfig-libdir.patch"
+ "${FILESDIR}/0009-grpc-1.12.1-gcc8-fixes.patch"
+)
+
+src_prepare() {
+ sed -i 's@$(prefix)/lib@$(prefix)/$(INSTALL_LIBDIR)@g' Makefile || die "fix libdir"
+ default
+ use python && distutils-r1_src_prepare
+}
+
+python_prepare() {
+ if use tools; then
+ rm -r third_party/protobuf || die "removing empty protobuf dir failed"
+ ln -s "${S}"/../protobuf-"${PROTOBUF_VERSION}" third_party/protobuf || die
+ pushd tools/distrib/python/grpcio_tools >/dev/null || die
+ # absolute symlinks will fail
+ # ./src -> ${S}/src
+ ln -s ../../../../src ./ || die
+ # ./third_party -> ${S}/third_party
+ ln -s ../../../../third_party ./ || die
+ # ./grpc_root -> ${S}
+ ln -s ../../../../ ./grpc_root || die
+ popd >/dev/null || die
+ fi
+}
+
+src_compile() {
+ tc-export CC CXX PKG_CONFIG
+
+ emake \
+ V=1 \
+ prefix=/usr \
+ INSTALL_LIBDIR="$(get_libdir)" \
+ AR="$(tc-getAR)" \
+ AROPTS="rcs" \
+ CFLAGS="${CFLAGS}" \
+ CXXFLAGS="${CXXFLAGS}" \
+ LD="${CC}" \
+ LDXX="${CXX}" \
+ STRIP=/bin/true \
+ HOST_CC="$(tc-getBUILD_CC)" \
+ HOST_CXX="$(tc-getBUILD_CXX)" \
+ HOST_LD="$(tc-getBUILD_CC)" \
+ HOST_LDXX="$(tc-getBUILD_CXX)" \
+ HOST_AR="$(tc-getBUILD_AR)" \
+ HAS_SYSTEMTAP="$(usex systemtap true false)"
+
+ use python && distutils-r1_src_compile
+}
+
+python_compile() {
+ export GRPC_PYTHON_BUILD_SYSTEM_CARES=1
+ export GRPC_PYTHON_BUILD_SYSTEM_OPENSSL=1
+ export GRPC_PYTHON_BUILD_SYSTEM_ZLIB=1
+ export GRPC_PYTHON_BUILD_WITH_CYTHON=1
+ distutils-r1_python_compile
+
+ if use tools; then
+ pushd tools/distrib/python/grpcio_tools >/dev/null || die
+ distutils-r1_python_compile
+ popd >/dev/null || die
+ fi
+}
+
+python_compile_all() {
+ if use doc; then
+ esetup.py doc
+ mv doc/build doc/html || die
+ fi
+}
+
+src_install() {
+ emake \
+ prefix="${D}"/usr \
+ INSTALL_LIBDIR="$(get_libdir)" \
+ STRIP=/bin/true \
+ install
+
+ use static-libs || find "${ED}" -name '*.a' -delete
+
+ if use examples; then
+ find examples -name '.gitignore' -delete || die
+ dodoc -r examples
+ docompress -x /usr/share/doc/${PF}/examples
+ fi
+
+ if use doc; then
+ find doc -name '.gitignore' -delete || die
+ local DOCS=( AUTHORS README.md doc/. )
+ fi
+
+ einstalldocs
+
+ use python && distutils-r1_src_install
+
+}
+
+python_install() {
+ distutils-r1_python_install
+
+ if use tools; then
+ pushd tools/distrib/python/grpcio_tools >/dev/null || die
+ distutils-r1_python_install
+ popd >/dev/null || die
+ fi
+}