nixpkgs/pkgs/games/stockfish/default.nix

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{ lib, stdenv, fetchurl, fetchFromGitHub }:
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let
# The x86-64-modern may need to be refined further in the future
# but stdenv.hostPlatform CPU flags do not currently work on Darwin
# https://discourse.nixos.org/t/darwin-system-and-stdenv-hostplatform-features/9745
archDarwin = if stdenv.isx86_64 then "x86-64-modern" else "x86-64";
arch = if stdenv.isDarwin then archDarwin else
if stdenv.isx86_64 then "x86-64" else
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if stdenv.isi686 then "x86-32" else
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if stdenv.isAarch64 then "armv8" else
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"unknown";
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nnueFile = "nn-6877cd24400e.nnue";
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nnue = fetchurl {
name = nnueFile;
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url = "https://tests.stockfishchess.org/api/nn/${nnueFile}";
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sha256 = "sha256-aHfNJEAOAbGf8SrjBoriQhUoAr3TMOZve2cDhlJR1uM=";
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};
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in
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stdenv.mkDerivation rec {
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pname = "stockfish";
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version = "15";
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src = fetchFromGitHub {
owner = "official-stockfish";
repo = "Stockfish";
rev = "sf_${version}";
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sha256 = "sha256-sK4Jw9BPGRvlm9oIcgGcmHe8G4GR4cEuD8MtDrHZKew=";
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};
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# This addresses a linker issue with Darwin
# https://github.com/NixOS/nixpkgs/issues/19098
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preBuild = lib.optionalString stdenv.isDarwin ''
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sed -i.orig '/^\#\#\# 3.*Link Time Optimization/,/^\#\#\# 3/d' Makefile
'';
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postUnpack = ''
sourceRoot+=/src
echo ${nnue}
cp "${nnue}" "$sourceRoot/${nnueFile}"
'';
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makeFlags = [ "PREFIX=$(out)" "ARCH=${arch}" "CXX=${stdenv.cc.targetPrefix}c++" ];
buildFlags = [ "build" ];
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enableParallelBuilding = true;
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meta = with lib; {
homepage = "https://stockfishchess.org/";
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description = "Strong open source chess engine";
longDescription = ''
Stockfish is one of the strongest chess engines in the world. It is also
much stronger than the best human chess grandmasters.
'';
maintainers = with maintainers; [ luispedro siraben ];
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platforms = ["x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux"];
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license = licenses.gpl3Only;
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};
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}