message: [build-command] Reorder input processing
diff: @@ -115,17 +115,9 @@ namespace vcpkg::Commands::Build
  void perform_and_exit(const vcpkg_cmd_arguments& args, const vcpkg_paths& paths, const triplet& default_target_triplet)
  {
  static const std::string example = Commands::Help::create_example_string("build zlib:x64-windows");
  -
  - // Installing multiple packages leads to unintuitive behavior if one of them depends on another.
  - // Allowing only 1 package for now.
  -
  - args.check_exact_arg_count(1, example);
  -
  - StatusParagraphs status_db = database_load_check(paths);
  -
  + args.check_exact_arg_count(1, example); // Build only takes a single package and all dependencies must already be installed
  const package_spec spec = Input::check_and_get_package_spec(args.command_arguments.at(0), default_target_triplet, example);
  Input::check_triplet(spec.target_triplet(), paths);
  -
  const std::unordered_set<std::string> options = args.check_and_get_optional_command_arguments({ OPTION_CHECKS_ONLY });
  if (options.find(OPTION_CHECKS_ONLY) != options.end())
  {
  @@ -143,6 +135,7 @@ namespace vcpkg::Commands::Build
  const SourceParagraph& spgh = *maybe_spgh.get();
  Environment::ensure_utilities_on_path(paths);
  + StatusParagraphs status_db = database_load_check(paths);
  const BuildResult result = build_package(spgh, spec, paths, paths.port_dir(spec), status_db);
  if (result == BuildResult::CASCADED_DUE_TO_MISSING_DEPENDENCIES)
  {
  