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+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=6
+
+inherit toolchain-funcs
+
+DESCRIPTION="Free UCI chess engine, claimed to be the strongest in the world"
+HOMEPAGE="http://stockfishchess.org/"
+
+SRC_URI="https://stockfish.s3.amazonaws.com/${P}-src.zip"
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE="armv7 cpu_flags_x86_avx2 cpu_flags_x86_popcnt cpu_flags_x86_sse debug
+	general-32 general-64 +optimize"
+
+DEPEND="|| ( app-arch/unzip	app-arch/zip )"
+RDEPEND=""
+
+S="${WORKDIR}/${P}-src/src"
+
+src_prepare() {
+	default
+
+	# prevent pre-stripping
+	sed -e 's:-strip $(BINDIR)/$(EXE)::' -i Makefile \
+		|| die 'failed to disable stripping in the Makefile'
+}
+
+src_compile() {
+	local my_arch
+
+	# generic unoptimized first
+	use general-32 && my_arch=general-32
+	use general-64 && my_arch=general-64
+
+	# x86
+	use x86 && my_arch=x86-32-old
+	use cpu_flags_x86_sse && my_arch=x86-32
+
+	# amd64
+	use amd64 && my_arch=x86-64
+	use cpu_flags_x86_popcnt && my_arch=x86-64-modern
+
+	# both bmi2 and avx2 are part of hni (haswell new instructions)
+	use cpu_flags_x86_avx2 && my_arch=x86-64-bmi2
+
+	# other architectures
+	use armv7 && my_arch=armv7
+	use ppc && my_arch=ppc
+	use ppc64 && my_arch=ppc64
+
+	# Skip the "build" target and use "all" instead to avoid the config
+	# sanity check (which would throw a fit about our compiler). There's
+	# a nice hack in the Makefile that overrides the value of CXX with
+	# COMPILER to support Travis CI and we abuse it to make sure that we
+	# build with our compiler of choice.
+	emake all ARCH="${my_arch}" \
+		COMP=$(tc-getCXX) \
+		COMPILER=$(tc-getCXX) \
+		debug=$(usex debug "yes" "no") \
+		optimize=$(usex optimize "yes" "no")
+}
+
+src_install() {
+	dobin "${PN}"
+	dodoc ../AUTHORS ../Readme.md
+}