Merge "Floss: Add --print-env to build.py"

        self.jobs = self.args.jobs

        if not self.jobs:

            self.jobs = multiprocessing.cpu_count()

            print("Number of jobs = {}".format(self.jobs))

            sys.stderr.write("Number of jobs = {}\n".format(self.jobs))

        # Normalize bootstrap dir and make sure it exists

        self.bootstrap_dir = os.path.abspath(self.args.bootstrap_dir)

        os.makedirs(os.path.join(cargo_home, 'bin'), exist_ok=True)

        # Configure Rust env variables

        self.env['CARGO_TARGET_DIR'] = self.output_dir

        self.env['CARGO_HOME'] = os.path.join(self.output_dir, 'cargo_home')

        self.env['RUSTFLAGS'] = self._generate_rustflags()

        self.env['CXX_ROOT_PATH'] = os.path.join(self.platform_dir, 'bt')

        self.env['CROS_SYSTEM_API_ROOT'] = os.path.join(self.platform_dir, 'system_api')

        self.env['CXX_OUTDIR'] = self._gn_default_output()

        self.custom_env = {}

        self.custom_env['CARGO_TARGET_DIR'] = self.output_dir

        self.custom_env['CARGO_HOME'] = os.path.join(self.output_dir, 'cargo_home')

        self.custom_env['RUSTFLAGS'] = self._generate_rustflags()

        self.custom_env['CXX_ROOT_PATH'] = os.path.join(self.platform_dir, 'bt')

        self.custom_env['CROS_SYSTEM_API_ROOT'] = os.path.join(self.platform_dir, 'system_api')

        self.custom_env['CXX_OUTDIR'] = self._gn_default_output()

        self.env.update(self.custom_env)

    def print_env(self):

        """ Print the custom environment variables that are used in build.

        Useful so that external tools can mimic the environment to be the same

        as build.py, e.g. rust-analyzer.

        """

        for k, v in self.custom_env.items():

            print("export {}='{}'".format(k, v))

    def run_command(self, target, args, cwd=None, env=None):

        """ Run command and stream the output.

        help='Run bootstrap code to verify build env is ok to build.',

        default=False,

        action='store_true')

    parser.add_argument(

        '--print-env', help='Print environment variables used for build.', default=False, action='store_true')

    parser.add_argument('--no-clang', help='Don\'t use clang compiler.', default=False, action='store_true')

    parser.add_argument(

        '--no-strip', help='Skip stripping binaries during install.', default=False, action='store_true')

    if args.run_bootstrap:

        bootstrap = Bootstrap(args.bootstrap_dir, os.path.dirname(__file__))

        bootstrap.bootstrap()

    elif args.print_env:

        build = HostBuild(args)

        build.print_env()

    else:

        build = HostBuild(args)

        build.build()