serializeConfigurationExiting

pub fn serializeConfigurationExiting(b: *Build) noreturn {
    const graph = b.graph;
    const io = graph.io;

    var stdout_buffer: [1024]u8 = undefined;
    var file_writer = Io.File.stdout().writerStreaming(io, &stdout_buffer);
    Serialize.write(b, &graph.wip_configuration, &file_writer.interface) catch |err| switch (err) {
        error.WriteFailed => fatal("failed to write configuration output: {t}", .{file_writer.err.?}),
        error.OutOfMemory => @panic("OOM"),
    };
    file_writer.flush() catch |err| fatal("failed to write configuration output: {t}", .{err});

    // This executable is short-lived and run in Debug mode, so we'd rather
    // have `zig build` run faster than catch resource leaks in the user's
    // build.zig script (or, frankly, this configure runner), therefore we call
    // exit directly here rather than cleanExit.
    process.exit(0);
}