zig/test/link/macho/pagezero/build.zig

const std = @import("std");
const Builder = std.build.Builder;

pub fn build(b: *Builder) void {
    const mode = b.standardReleaseOptions();
    const target: std.zig.CrossTarget = .{ .os_tag = .macos };

    const test_step = b.step("test", "Test");
    test_step.dependOn(b.getInstallStep());

    {
        const exe = b.addExecutable("pagezero", null);
        exe.setTarget(target);
        exe.setBuildMode(mode);
        exe.addCSourceFile("main.c", &.{});
        exe.linkLibC();
        exe.pagezero_size = 0x4000;

        const check = exe.checkObject(.macho);
        check.checkStart("LC 0");
        check.checkNext("segname __PAGEZERO");
        check.checkNext("vmaddr 0");
        check.checkNext("vmsize 4000");

        check.checkStart("segname __TEXT");
        check.checkNext("vmaddr 4000");

        test_step.dependOn(&check.step);
    }

    {
        const exe = b.addExecutable("no_pagezero", null);
        exe.setTarget(target);
        exe.setBuildMode(mode);
        exe.addCSourceFile("main.c", &.{});
        exe.linkLibC();
        exe.pagezero_size = 0;

        const check = exe.checkObject(.macho);
        check.checkStart("LC 0");
        check.checkNext("segname __TEXT");
        check.checkNext("vmaddr 0");

        test_step.dependOn(&check.step);
    }
}