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# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=7
inherit toolchain-funcs
DESCRIPTION="Free UCI chess engine, claimed to be the strongest in the world"
HOMEPAGE="https://stockfishchess.org/"
NNUE_FILE="nn-3475407dc199.nnue"
SRC_URI="https://github.com/official-stockfish/Stockfish/archive/sf_${PV}.tar.gz -> ${P}.tar.gz
https://tests.stockfishchess.org/api/nn/${NNUE_FILE} -> ${P}-${NNUE_FILE}"
LICENSE="GPL-3"
SLOT="0"
KEYWORDS="~amd64 ~riscv ~x86"
IUSE="cpu_flags_arm_v7 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="${WORKDIR}/Stockfish-sf_${PV}/src"
src_prepare() {
default
cp "${DISTDIR}"/${P}-${NNUE_FILE} ${NNUE_FILE} || die "copying the nnue file failed"
# 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 cpu_flags_arm_v7 && 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
}
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