opt.add_option('--no-native',action='store_true',default=False,help='disable -march=native, which can cause some troubles [--no-native]',dest='no_native')
opt.add_option('--debug-build',action='store_true',default=False,help='build a debugging build with limited optimization',dest='debug_build')
opt.add_option('--debug_build',action='store_true',default=False,help='build a debugging build with limited optimization',dest='debug_build')