build from a tar

.github/workflows/zig-build.yml

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+name: Continuous Integration
+
+on:
+  push:
+    branches: ['*']
+
+  pull_request:
+    branches: ['*']
+
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up LLVM and Clang
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y lld llvm llvm-dev clang
+
+      - name: Set up Zig
+        uses: mlugg/setup-zig@v1
+
+      - name: Run `build`
+        run: zig build

.gitignore

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+# Files from build
+**/*.o
+**/*.s
+src/.depend
+
+# Built binary
+src/stockfish*
+src/-lstdc++.res
+
+# Neural network for the NNUE evaluation
+**/*.nnue
+
+# Files generated by the instrumented tests
+tsan.supp
+__pycache__/
+tests/syzygy
+tests/bench_tmp.epd
+
+.zig-cache/
+zig-out/

build.zig

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+const std = @import("std");
+const builtin = @import("builtin");
+const assert = std.debug.assert;
+const Allocator = mem.Allocator;
+const Build = std.Build;
+const fmt = std.fmt;
+const fs = std.fs;
+const heap = std.heap;
+const http = std.http;
+const math = std.math;
+const mem = std.mem;
+
+pub fn build(b: *Build) !void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const opts = b.addOptions();
+
+    const embed_nets = b.option(bool, "embed-nets", "Whether or not to embed the NNUE file in the executable (default: true)") orelse true;
+    opts.addOption(bool, "embed-nets", embed_nets);
+
+    const small_net = b.option([]const u8, "small-net", "Name of the small NNUE (default: \"nn-37f18f62d772.nnue\")") orelse "nn-37f18f62d772.nnue";
+    opts.addOption([]const u8, "small-net", small_net);
+
+    const big_net = b.option([]const u8, "big-net", "Name of the big NNUE (default: \"nn-1111cefa1111.nnue\")") orelse "nn-1111cefa1111.nnue";
+    opts.addOption([]const u8, "big-net", big_net);
+
+    try downloadNNUE(b, small_net);
+    try downloadNNUE(b, big_net);
+
+    const stockfish_dep = b.dependency("Stockfish", .{});
+    const stockfish_src_path = stockfish_dep.path("src/");
+
+    const exe = b.addExecutable(.{
+        .name = "stockfish",
+        .target = target,
+        .optimize = optimize,
+    });
+    b.installArtifact(exe);
+
+    const run_cmd = b.addRunArtifact(exe);
+    run_cmd.step.dependOn(b.getInstallStep());
+    if (b.args) |args| run_cmd.addArgs(args);
+
+    const run_step = b.step("run", "Build and run stockfish");
+    run_step.dependOn(&run_cmd.step);
+
+    exe.linkLibC();
+    exe.linkLibCpp();
+
+    if (optimize != .Debug) {
+        exe.root_module.pic = true;
+        exe.pie = true;
+        exe.root_module.omit_frame_pointer = true;
+        exe.root_module.strip = true;
+        exe.want_lto = switch (builtin.os.tag) {
+            .macos => false,
+            else => true,
+        };
+    }
+
+    exe.addCSourceFiles(.{
+        .root = stockfish_src_path,
+        .files = &.{
+            "movegen.cpp",
+            "engine.cpp",
+            "nnue/features/half_ka_v2_hm.cpp",
+            "nnue/nnue_misc.cpp",
+            "nnue/network.cpp",
+            "memory.cpp",
+            "uci.cpp",
+            "search.cpp",
+            "ucioption.cpp",
+            "tt.cpp",
+            "bitboard.cpp",
+            "score.cpp",
+            "main.cpp",
+            "thread.cpp",
+            "benchmark.cpp",
+            "position.cpp",
+            "movepick.cpp",
+            "timeman.cpp",
+            "misc.cpp",
+            "tune.cpp",
+            "syzygy/tbprobe.cpp",
+            "evaluate.cpp",
+        },
+        .flags = &.{
+            if (embed_nets) "" else "-DNNUE_EMBEDDING_OFF=1",
+        },
+    });
+}
+
+/// The first time we run "zig build", we need to download a nnue file from the
+/// internet. We search for the correct file to download in the macro
+/// #define EvalFileDefaultName in evaluate.h.
+fn downloadNNUE(b: *Build, nnue_file: []const u8) !void {
+    _ = fs.cwd().statFile(nnue_file) catch |err| {
+        switch (err) {
+            error.FileNotFound => {
+                const url = try fmt.allocPrint(b.allocator, "https://data.stockfishchess.org/nn/{s}", .{nnue_file});
+                std.debug.print("No nnue file found, downloading {s}\n\n", .{url});
+
+                var child = std.process.Child.init(&.{ "curl", "-o", nnue_file, url }, b.allocator);
+                try child.spawn();
+                _ = try child.wait();
+            },
+            else => return err,
+        }
+    };
+}

build.zig.zon

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+.{
+    .name = "Stockfish",
+    .version = "17.0.0",
+    .minimum_zig_version = "0.13.0",
+    .dependencies = .{
+        .Stockfish = .{
+            .url = "https://github.com/official-stockfish/Stockfish/archive/sf_17.tar.gz",
+            .hash = "1220d8a16d771e844df720de6eb3b2a816411eb21372d8c2ae001f82af5715f55cfc",
+        },
+    },
+    .paths = .{
+        "build.zig",
+        "build.zig.zon",
+        "LICENSE",
+        "README.md",
+    },
+}