option('bcc', type: 'feature', value: 'auto', description: 'Built-in C compiler')option('hardened', type: 'feature', value: 'enabled', description: 'Compile with additional hardening options')option('test3rd', type: 'feature', value: 'disabled', description: 'Test third party logic')option('xxhash', type: 'feature', value: 'disabled', description: 'Use xxhash for hashing')option('loop', type: 'combo', choices: ['jmptbl', 'switch', 'funcs'], value: 'jmptbl', description: 'Use a specific mechanism for VM loop')