zig : add build.zig (ggml-org#773)

Co-authored-by: Locria Cyber <74560659+locriacyber@users.noreply.github.com>

Author: iacore

.gitignore

@@ -33,3 +33,6 @@ compile_commands.json
 .venv
 __pycache__
 .swiftpm
+
+zig-out/
+zig-cache/

build.zig

@@ -0,0 +1,62 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const lib = b.addStaticLibrary(.{
+        .name = "llama",
+        .target = target,
+        .optimize = optimize,
+    });
+    lib.linkLibCpp();
+    lib.addIncludePath(".");
+    lib.addIncludePath("examples");
+    lib.addCSourceFiles(&.{
+        "ggml.c",
+    }, &.{"-std=c11"});
+    lib.addCSourceFiles(&.{
+        "llama.cpp",
+        "examples/common.cpp",
+    }, &.{"-std=c++11"});
+    lib.install();
+
+    const build_args = .{ .b = b, .lib = lib, .target = target, .optimize = optimize };
+    const exe = build_example("main", build_args);
+    _ = build_example("quantize", build_args);
+    _ = build_example("perplexity", build_args);
+    _ = build_example("embedding", build_args);
+
+    // create "zig build run" command for ./main
+
+    const run_cmd = exe.run();
+    run_cmd.step.dependOn(b.getInstallStep());
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+}
+
+fn build_example(comptime name: []const u8, args: anytype) *std.build.LibExeObjStep {
+    const b = args.b;
+    const lib = args.lib;
+    const target = args.target;
+    const optimize = args.optimize;
+
+    const exe = b.addExecutable(.{
+        .name = name,
+        .target = target,
+        .optimize = optimize,
+    });
+    exe.addIncludePath(".");
+    exe.addIncludePath("examples");
+    exe.addCSourceFiles(&.{
+        std.fmt.comptimePrint("examples/{s}/{s}.cpp", .{name, name}),
+    }, &.{"-std=c++11"});
+    exe.linkLibrary(lib);
+    exe.install();
+
+    return exe;
+}