Updated build.zig to use with MicroW8 (requires Zig ⚡ 0.12.0-dev.1482+e74ced21b or later)

build.zig

const std = @import("std");

pub fn build(b: *std.Build) void {
    const exe = b.addExecutable(.{
        .name = "cart",
        .root_source_file = .{ .path = "src/main.zig" },
        .target = .{
            .cpu_arch = .wasm32,
            .os_tag = .freestanding,
            .cpu_features_add = std.Target.wasm.featureSet(&.{.nontrapping_fptoint}),
        },
        .optimize = b.standardOptimizeOption(.{ .preferred_optimize_mode = .ReleaseSmall }),
    });

    exe.entry = .disabled;
    exe.export_symbol_names = &[_][]const u8{"upd"};
    exe.global_base = 81920;
    exe.import_memory = true;
    exe.initial_memory = 262144;
    exe.max_memory = 262144;
    exe.stack_size = 8192;

    const run_filter_exports = b.addSystemCommand(&[_][]const u8{ "uw8", "filter-exports", "zig-out/bin/cart.wasm", "zig-out/bin/cart-filtered.wasm" });
    run_filter_exports.step.dependOn(b.getInstallStep());

    const run_wasm_opt = b.addSystemCommand(&[_][]const u8{ "wasm-opt", "-Oz", "-o", "zig-out/cart.wasm", "zig-out/bin/cart-filtered.wasm" });
    run_wasm_opt.step.dependOn(&run_filter_exports.step);

    const run_uw8_pack = b.addSystemCommand(&[_][]const u8{ "uw8", "pack", "-l", "9", "zig-out/cart.wasm", "zig-out/cart.uw8" });
    run_uw8_pack.step.dependOn(&run_wasm_opt.step);

    const make_opt = b.step("make_opt", "make size optimized cart");
    make_opt.dependOn(&run_uw8_pack.step);

    b.default_step = make_opt;

    b.installArtifact(exe);
}

MicroW8

The current build.zig for the microw8 example written in Zig is quite out of date with the latest version of Zig ⚡

So I had to make some changes in order to be able to build carts (both .wasm and .uw8)