const std = @import("std");

pub fn build(b: *std.Build) void {
    const target = b.resolveTargetQuery(.{
        .cpu_arch = .thumb,
        .os_tag = .freestanding,
        .abi = .eabi,
        .cpu_model = .{ .explicit = &std.Target.arm.cpu.cortex_m4 },
    });

    const optimize = b.standardOptimizeOption(.{});

    // Create the module separately
    const tiva_module = b.createModule(.{
        .root_source_file = b.path("src/main.zig"),
        .target = target,
        .optimize = optimize,
    });

    const cmsis_path = "/home/priec/programs/CMSIS";

    // Generic CMSIS Core (for core_cm4.h)
    tiva_module.addIncludePath(.{ .cwd_relative = cmsis_path ++ "/CMSIS/Include" });
    // TM4C Device Specific (for TM4C123GH6PM.h)
    tiva_module.addIncludePath(.{ .cwd_relative = cmsis_path ++ "/Device/TI/TM4C/Include" });

    const elf = b.addExecutable(.{
        .name = "tiva-app",
        .root_module = tiva_module,
    });

    elf.root_module.strip = true; 
    elf.root_module.omit_frame_pointer = true;
    elf.root_module.unwind_tables = .none;

    // Disable red zone for bare metal
    elf.root_module.red_zone = false;

    // Provide basic built-in functions
    elf.bundle_compiler_rt = true;
    elf.link_gc_sections = true;

    // Use your custom linker script
    elf.setLinkerScript(b.path("layout.ld"));

    b.installArtifact(elf);
}