opt.add_option('--tests',action='store_true',help='compile tests or not',dest='tests')
opt.add_option('--write_params',type='string',help='write all the default values of parameters in a file (used by the documentation system)',dest='write_params')
opt.add_option('--regression_benchmarks',type='string',help='config file (json) to compile benchmark for regression',dest='regression_benchmarks')