pub const Linkage = enum(u4) {
    private = 9,
    internal = 3,
    weak = 1,
    weak_odr = 10,
    linkonce = 4,
    linkonce_odr = 11,
    available_externally = 12,
    appending = 2,
    common = 8,
    extern_weak = 7,
    external = 0,

    pub fn format(
        self: Linkage,
        comptime _: []const u8,
        _: std.fmt.FormatOptions,
        writer: anytype,
    ) @TypeOf(writer).Error!void {
        if (self != .external) try writer.print(" {s}", .{@tagName(self)});
    }

    fn formatOptional(
        data: ?Linkage,
        comptime _: []const u8,
        _: std.fmt.FormatOptions,
        writer: anytype,
    ) @TypeOf(writer).Error!void {
        if (data) |linkage| try writer.print(" {s}", .{@tagName(linkage)});
    }
    pub fn fmtOptional(self: ?Linkage) std.fmt.Formatter(formatOptional) {
        return .{ .data = self };
    }
}